Commit | Line | Data |
---|---|---|
568717fd LC |
1 | \input texinfo |
2 | @c -*-texinfo-*- | |
3 | ||
4 | @c %**start of header | |
5 | @setfilename guix.info | |
6 | @documentencoding UTF-8 | |
f8348b91 | 7 | @settitle GNU Guix Reference Manual |
568717fd LC |
8 | @c %**end of header |
9 | ||
10 | @include version.texi | |
7df7a74e NK |
11 | |
12 | @copying | |
db5a9444 | 13 | Copyright @copyright{} 2012, 2013, 2014, 2015, 2016 Ludovic Courtès@* |
f97c9175 | 14 | Copyright @copyright{} 2013, 2014, 2016 Andreas Enge@* |
87eafdbd | 15 | Copyright @copyright{} 2013 Nikita Karetnikov@* |
8c01b9d0 ML |
16 | Copyright @copyright{} 2015 Mathieu Lirzin@* |
17 | Copyright @copyright{} 2014 Pierre-Antoine Rault@* | |
97d76250 LF |
18 | Copyright @copyright{} 2015 Taylan Ulrich Bayırlı/Kammer@* |
19 | Copyright @copyright{} 2015, 2016 Leo Famulari | |
7df7a74e NK |
20 | |
21 | Permission is granted to copy, distribute and/or modify this document | |
22 | under the terms of the GNU Free Documentation License, Version 1.3 or | |
23 | any later version published by the Free Software Foundation; with no | |
24 | Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A | |
25 | copy of the license is included in the section entitled ``GNU Free | |
26 | Documentation License''. | |
27 | @end copying | |
568717fd | 28 | |
eeaf4427 | 29 | @dircategory Package management |
568717fd LC |
30 | @direntry |
31 | * guix: (guix). Guix, the functional package manager. | |
e49951eb | 32 | * guix package: (guix)Invoking guix package |
eeaf4427 | 33 | Managing packages with Guix. |
e49951eb | 34 | * guix build: (guix)Invoking guix build |
568717fd | 35 | Building packages with Guix. |
054e8576 LC |
36 | * guix system: (guix)Invoking guix system |
37 | Managing the operating system configuration. | |
568717fd | 38 | @end direntry |
568717fd | 39 | |
372c4bbc DT |
40 | @dircategory Software development |
41 | @direntry | |
42 | * guix environment: (guix)Invoking guix environment | |
43 | Building development environments with Guix. | |
44 | @end direntry | |
45 | ||
568717fd | 46 | @titlepage |
7730d112 LC |
47 | @title GNU Guix Reference Manual |
48 | @subtitle Using the GNU Guix Functional Package Manager | |
2cbed07e | 49 | @author The GNU Guix Developers |
568717fd LC |
50 | |
51 | @page | |
52 | @vskip 0pt plus 1filll | |
53 | Edition @value{EDITION} @* | |
54 | @value{UPDATED} @* | |
55 | ||
7df7a74e | 56 | @insertcopying |
568717fd LC |
57 | @end titlepage |
58 | ||
568717fd LC |
59 | @contents |
60 | ||
61 | @c ********************************************************************* | |
62 | @node Top | |
f8348b91 | 63 | @top GNU Guix |
568717fd | 64 | |
f8348b91 LC |
65 | This document describes GNU Guix version @value{VERSION}, a functional |
66 | package management tool written for the GNU system. | |
568717fd LC |
67 | |
68 | @menu | |
69 | * Introduction:: What is Guix about? | |
bd5e766b | 70 | * Installation:: Installing Guix. |
eeaf4427 | 71 | * Package Management:: Package installation, upgrade, etc. |
c554de89 | 72 | * Emacs Interface:: Using Guix from Emacs. |
568717fd LC |
73 | * Programming Interface:: Using Guix in Scheme. |
74 | * Utilities:: Package management commands. | |
a1ba8475 | 75 | * GNU Distribution:: Software for your friendly GNU system. |
9bf3c1a7 | 76 | * Contributing:: Your help needed! |
568717fd LC |
77 | |
78 | * Acknowledgments:: Thanks! | |
79 | * GNU Free Documentation License:: The license of this manual. | |
80 | * Concept Index:: Concepts. | |
a85b83d2 | 81 | * Programming Index:: Data types, functions, and variables. |
aaa3eaa9 LC |
82 | |
83 | @detailmenu | |
84 | --- The Detailed Node Listing --- | |
85 | ||
86 | Installation | |
87 | ||
1b2b8177 | 88 | * Binary Installation:: Getting Guix running in no time! |
aaa3eaa9 | 89 | * Requirements:: Software needed to build and run Guix. |
ec0339cd | 90 | * Running the Test Suite:: Testing Guix. |
aaa3eaa9 LC |
91 | * Setting Up the Daemon:: Preparing the build daemon's environment. |
92 | * Invoking guix-daemon:: Running the build daemon. | |
0e2d0213 | 93 | * Application Setup:: Application-specific setup. |
aaa3eaa9 LC |
94 | |
95 | Setting Up the Daemon | |
96 | ||
97 | * Build Environment Setup:: Preparing the isolated build environment. | |
98 | * Daemon Offload Setup:: Offloading builds to remote machines. | |
99 | ||
100 | Package Management | |
101 | ||
102 | * Features:: How Guix will make your life brighter. | |
103 | * Invoking guix package:: Package installation, removal, etc. | |
aaa3eaa9 LC |
104 | * Substitutes:: Downloading pre-built binaries. |
105 | * Packages with Multiple Outputs:: Single source package, multiple outputs. | |
106 | * Invoking guix gc:: Running the garbage collector. | |
107 | * Invoking guix pull:: Fetching the latest Guix and distribution. | |
108 | * Invoking guix archive:: Exporting and importing store files. | |
109 | ||
c554de89 AK |
110 | Emacs Interface |
111 | ||
112 | * Initial Setup: Emacs Initial Setup. Preparing @file{~/.emacs}. | |
113 | * Package Management: Emacs Package Management. Managing packages and generations. | |
687c9bc0 | 114 | * Licenses: Emacs Licenses. Interface for licenses of Guix packages. |
9b0afb0d | 115 | * Popup Interface: Emacs Popup Interface. Magit-like interface for guix commands. |
c554de89 | 116 | * Prettify Mode: Emacs Prettify. Abbreviating @file{/gnu/store/@dots{}} file names. |
34850cd5 | 117 | * Build Log Mode: Emacs Build Log. Highlighting Guix build logs. |
187f80c6 AK |
118 | * Completions: Emacs Completions. Completing @command{guix} shell command. |
119 | * Development: Emacs Development. Tools for Guix developers. | |
32950fc8 | 120 | * Hydra: Emacs Hydra. Interface for Guix build farm. |
c554de89 | 121 | |
aaa3eaa9 LC |
122 | Programming Interface |
123 | ||
124 | * Defining Packages:: Defining new packages. | |
125 | * Build Systems:: Specifying how packages are built. | |
126 | * The Store:: Manipulating the package store. | |
127 | * Derivations:: Low-level interface to package derivations. | |
128 | * The Store Monad:: Purely functional interface to the store. | |
129 | * G-Expressions:: Manipulating build expressions. | |
130 | ||
92492b23 LC |
131 | Defining Packages |
132 | ||
133 | * package Reference:: The package data type. | |
134 | * origin Reference:: The origin data type. | |
135 | ||
aaa3eaa9 LC |
136 | Utilities |
137 | ||
138 | * Invoking guix build:: Building packages from the command line. | |
fcc58db6 | 139 | * Invoking guix edit:: Editing package definitions. |
aaa3eaa9 LC |
140 | * Invoking guix download:: Downloading a file and printing its hash. |
141 | * Invoking guix hash:: Computing the cryptographic hash of a file. | |
142 | * Invoking guix import:: Importing package definitions. | |
143 | * Invoking guix refresh:: Updating package definitions. | |
144 | * Invoking guix lint:: Finding errors in package definitions. | |
fcc58db6 | 145 | * Invoking guix size:: Profiling disk usage. |
88856916 | 146 | * Invoking guix graph:: Visualizing the graph of packages. |
aaa3eaa9 | 147 | * Invoking guix environment:: Setting up development environments. |
aff8ce7c | 148 | * Invoking guix publish:: Sharing substitutes. |
d23c20f1 | 149 | * Invoking guix challenge:: Challenging substitute servers. |
32efa254 | 150 | * Invoking guix container:: Process isolation. |
aaa3eaa9 LC |
151 | |
152 | GNU Distribution | |
153 | ||
154 | * System Installation:: Installing the whole operating system. | |
35ed9306 | 155 | * System Configuration:: Configuring the operating system. |
aaa3eaa9 LC |
156 | * Installing Debugging Files:: Feeding the debugger. |
157 | * Security Updates:: Deploying security fixes quickly. | |
158 | * Package Modules:: Packages from the programmer's viewpoint. | |
159 | * Packaging Guidelines:: Growing the distribution. | |
160 | * Bootstrapping:: GNU/Linux built from scratch. | |
161 | * Porting:: Targeting another platform or kernel. | |
162 | ||
163 | System Configuration | |
164 | ||
165 | * Using the Configuration System:: Customizing your GNU system. | |
166 | * operating-system Reference:: Detail of operating-system declarations. | |
167 | * File Systems:: Configuring file system mounts. | |
168 | * Mapped Devices:: Block device extra processing. | |
169 | * User Accounts:: Specifying user accounts. | |
598e19dc | 170 | * Locales:: Language and cultural convention settings. |
aaa3eaa9 LC |
171 | * Services:: Specifying system services. |
172 | * Setuid Programs:: Programs running with root privileges. | |
1b2b8177 | 173 | * X.509 Certificates:: Authenticating HTTPS servers. |
996ed739 | 174 | * Name Service Switch:: Configuring libc's name service switch. |
aaa3eaa9 LC |
175 | * Initial RAM Disk:: Linux-Libre bootstrapping. |
176 | * GRUB Configuration:: Configuring the boot loader. | |
177 | * Invoking guix system:: Instantiating a system configuration. | |
97d76250 | 178 | * Running GuixSD in a VM:: How to run GuixSD in a virtual machine. |
aaa3eaa9 LC |
179 | * Defining Services:: Adding new service definitions. |
180 | ||
181 | Services | |
182 | ||
183 | * Base Services:: Essential system services. | |
184 | * Networking Services:: Network setup, SSH daemon, etc. | |
185 | * X Window:: Graphical display. | |
1b2b8177 LC |
186 | * Desktop Services:: D-Bus and desktop services. |
187 | * Database Services:: SQL databases. | |
d8c18af8 | 188 | * Mail Services:: IMAP, POP3, SMTP, and all that. |
cbd02397 | 189 | * Web Services:: Web servers. |
aa4ed923 | 190 | * Various Services:: Other services. |
aaa3eaa9 | 191 | |
0adfe95a LC |
192 | Defining Services |
193 | ||
194 | * Service Composition:: The model for composing services. | |
195 | * Service Types and Services:: Types and services. | |
196 | * Service Reference:: API reference. | |
dd17bc38 | 197 | * Shepherd Services:: A particular type of service. |
0adfe95a | 198 | |
aaa3eaa9 LC |
199 | Packaging Guidelines |
200 | ||
ec0339cd LC |
201 | * Software Freedom:: What may go into the distribution. |
202 | * Package Naming:: What's in a name? | |
203 | * Version Numbers:: When the name is not enough. | |
cbd02397 | 204 | * Synopses and Descriptions:: Helping users find the right package. |
ec0339cd LC |
205 | * Python Modules:: Taming the snake. |
206 | * Perl Modules:: Little pearls. | |
207 | * Fonts:: Fond of fonts. | |
aaa3eaa9 | 208 | |
8c01b9d0 ML |
209 | Contributing |
210 | ||
211 | * Building from Git:: The latest and greatest. | |
212 | * Running Guix Before It Is Installed:: Hacker tricks. | |
213 | * The Perfect Setup:: The right tools. | |
214 | * Coding Style:: Hygiene of the contributor. | |
215 | * Submitting Patches:: Share your work. | |
216 | ||
217 | Coding Style | |
218 | ||
219 | * Programming Paradigm:: How to compose your elements. | |
220 | * Modules:: Where to store your code? | |
221 | * Data Types and Pattern Matching:: Implementing data structures. | |
222 | * Formatting Code:: Writing conventions. | |
223 | ||
aaa3eaa9 | 224 | @end detailmenu |
568717fd LC |
225 | @end menu |
226 | ||
227 | @c ********************************************************************* | |
228 | @node Introduction | |
229 | @chapter Introduction | |
230 | ||
c80e7e55 LC |
231 | GNU Guix@footnote{``Guix'' is pronounced like ``geeks'', or ``ɡiːks'' |
232 | using the international phonetic alphabet (IPA).} is a functional | |
233 | package management tool for the GNU system. Package management consists | |
4bfc4ea3 NK |
234 | of all activities that relate to building packages from sources, |
235 | honoring their build-time and run-time dependencies, | |
c80e7e55 LC |
236 | installing packages in user environments, upgrading installed packages |
237 | to new versions or rolling back to a previous set, removing unused | |
238 | software packages, etc. | |
568717fd LC |
239 | |
240 | @cindex functional package management | |
241 | The term @dfn{functional} refers to a specific package management | |
136787cb LC |
242 | discipline pioneered by Nix (@pxref{Acknowledgments}). |
243 | In Guix, the package build and installation process is seen | |
4bfc4ea3 NK |
244 | as a function, in the mathematical sense. That function takes inputs, |
245 | such as build scripts, a compiler, and libraries, and | |
246 | returns an installed package. As a pure function, its result depends | |
568717fd LC |
247 | solely on its inputs---for instance, it cannot refer to software or |
248 | scripts that were not explicitly passed as inputs. A build function | |
4bfc4ea3 | 249 | always produces the same result when passed a given set of inputs. It |
f97c9175 | 250 | cannot alter the environment of the running system in |
568717fd LC |
251 | any way; for instance, it cannot create, modify, or delete files outside |
252 | of its build and installation directories. This is achieved by running | |
e900c503 | 253 | build processes in isolated environments (or @dfn{containers}), where only their |
4bfc4ea3 | 254 | explicit inputs are visible. |
568717fd | 255 | |
e531ac2a | 256 | @cindex store |
568717fd | 257 | The result of package build functions is @dfn{cached} in the file |
e531ac2a | 258 | system, in a special directory called @dfn{the store} (@pxref{The |
f97c9175 | 259 | Store}). Each package is installed in a directory of its own in the |
834129e0 | 260 | store---by default under @file{/gnu/store}. The directory name contains |
568717fd LC |
261 | a hash of all the inputs used to build that package; thus, changing an |
262 | input yields a different directory name. | |
263 | ||
f97c9175 AE |
264 | This approach is the foundation for the salient features of Guix: support |
265 | for transactional package upgrade and rollback, per-user installation, and | |
eeaf4427 | 266 | garbage collection of packages (@pxref{Features}). |
568717fd | 267 | |
4bfc4ea3 | 268 | Guix has a command-line interface, which allows users to build, install, |
568717fd | 269 | upgrade, and remove packages, as well as a Scheme programming interface. |
568717fd | 270 | |
3ca2731c | 271 | @cindex Guix System Distribution |
4705641f | 272 | @cindex GuixSD |
a1ba8475 | 273 | Last but not least, Guix is used to build a distribution of the GNU |
3ca2731c | 274 | system, with many GNU and non-GNU free software packages. The Guix |
4705641f LC |
275 | System Distribution, or GNU@tie{}GuixSD, takes advantage of the core |
276 | properties of Guix at the system level. With GuixSD, users | |
3ca2731c LC |
277 | @emph{declare} all aspects of the operating system configuration, and |
278 | Guix takes care of instantiating that configuration in a reproducible, | |
279 | stateless fashion. @xref{GNU Distribution}. | |
a1ba8475 | 280 | |
bd5e766b LC |
281 | @c ********************************************************************* |
282 | @node Installation | |
283 | @chapter Installation | |
284 | ||
48febeb8 LC |
285 | GNU Guix is available for download from its website at |
286 | @url{http://www.gnu.org/software/guix/}. This section describes the | |
287 | software requirements of Guix, as well as how to install it and get | |
288 | ready to use it. | |
bd5e766b | 289 | |
5af6de3e LC |
290 | Note that this section is concerned with the installation of the package |
291 | manager, which can be done on top of a running GNU/Linux system. If, | |
292 | instead, you want to install the complete GNU operating system, | |
6621cdb6 | 293 | @pxref{System Installation}. |
5af6de3e | 294 | |
bd5e766b | 295 | @menu |
09722b11 | 296 | * Binary Installation:: Getting Guix running in no time! |
bd5e766b | 297 | * Requirements:: Software needed to build and run Guix. |
ec0339cd | 298 | * Running the Test Suite:: Testing Guix. |
bd5e766b LC |
299 | * Setting Up the Daemon:: Preparing the build daemon's environment. |
300 | * Invoking guix-daemon:: Running the build daemon. | |
0e2d0213 | 301 | * Application Setup:: Application-specific setup. |
bd5e766b LC |
302 | @end menu |
303 | ||
09722b11 LC |
304 | @node Binary Installation |
305 | @section Binary Installation | |
306 | ||
307 | This section describes how to install Guix on an arbitrary system from a | |
308 | self-contained tarball providing binaries for Guix and for all its | |
309 | dependencies. This is often quicker than installing from source, which | |
310 | is described in the next sections. The only requirement is to have | |
311 | GNU@tie{}tar and Xz. | |
312 | ||
313 | Installing goes along these lines: | |
314 | ||
315 | @enumerate | |
316 | @item | |
317 | Download the binary tarball from | |
daa8922a LC |
318 | @indicateurl{ftp://alpha.gnu.org/gnu/guix/guix-binary-@value{VERSION}.@var{system}.tar.xz}, |
319 | where @var{system} is @code{x86_64-linux} for an @code{x86_64} machine | |
320 | already running the kernel Linux, and so on. | |
321 | ||
322 | Make sure to download the associated @file{.sig} file and to verify the | |
323 | authenticity of the tarball against it, along these lines: | |
324 | ||
325 | @example | |
326 | $ wget ftp://alpha.gnu.org/gnu/guix/guix-binary-@value{VERSION}.@var{system}.tar.xz.sig | |
327 | $ gpg --verify guix-binary-@value{VERSION}.@var{system}.tar.xz.sig | |
328 | @end example | |
329 | ||
f97c9175 | 330 | If that command fails because you do not have the required public key, |
daa8922a LC |
331 | then run this command to import it: |
332 | ||
333 | @example | |
334 | $ gpg --keyserver keys.gnupg.net --recv-keys 3D9AEBB5 | |
335 | @end example | |
336 | ||
337 | @noindent | |
338 | and rerun the @code{gpg --verify} command. | |
09722b11 LC |
339 | |
340 | @item | |
341 | As @code{root}, run: | |
342 | ||
343 | @example | |
5dc42964 | 344 | # cd /tmp |
254b1c2e LC |
345 | # tar --warning=no-timestamp -xf \ |
346 | guix-binary-@value{VERSION}.@var{system}.tar.xz | |
5dc42964 | 347 | # mv var/guix /var/ && mv gnu / |
09722b11 LC |
348 | @end example |
349 | ||
7acd3439 LC |
350 | This creates @file{/gnu/store} (@pxref{The Store}) and @file{/var/guix}. |
351 | The latter contains a ready-to-use profile for @code{root} (see next | |
352 | step.) | |
09722b11 | 353 | |
5dc3ce5f LC |
354 | Do @emph{not} unpack the tarball on a working Guix system since that |
355 | would overwrite its own essential files. | |
356 | ||
254b1c2e | 357 | The @code{--warning=no-timestamp} option makes sure GNU@tie{}tar does |
e9ba6357 LC |
358 | not emit warnings about ``implausibly old time stamps'' (such |
359 | warnings were triggered by GNU@tie{}tar 1.26 and older; recent | |
360 | versions are fine.) | |
361 | They stem from the fact that all the | |
254b1c2e LC |
362 | files in the archive have their modification time set to zero (which |
363 | means January 1st, 1970.) This is done on purpose to make sure the | |
364 | archive content is independent of its creation time, thus making it | |
365 | reproducible. | |
366 | ||
7acd3439 LC |
367 | @item |
368 | Make @code{root}'s profile available under @file{~/.guix-profile}: | |
369 | ||
370 | @example | |
371 | # ln -sf /var/guix/profiles/per-user/root/guix-profile \ | |
372 | ~root/.guix-profile | |
373 | @end example | |
374 | ||
43c33047 LC |
375 | @item |
376 | Create the group and user accounts for build users as explained below | |
377 | (@pxref{Build Environment Setup}). | |
378 | ||
09722b11 | 379 | @item |
175ced41 | 380 | Run the daemon: |
09722b11 LC |
381 | |
382 | @example | |
7acd3439 | 383 | # ~root/.guix-profile/bin/guix-daemon --build-users-group=guixbuild |
09722b11 LC |
384 | @end example |
385 | ||
d2825c96 LC |
386 | On hosts using the systemd init system, drop |
387 | @file{~root/.guix-profile/lib/systemd/system/guix-daemon.service} in | |
388 | @file{/etc/systemd/system}. | |
389 | ||
ad227484 MDRS |
390 | Likewise, on hosts using the Upstart init system, drop |
391 | @file{~root/.guix-profile/lib/upstart/system/guix-daemon.conf} in | |
392 | @file{/etc/init}. | |
393 | ||
09722b11 LC |
394 | @item |
395 | Make the @command{guix} command available to other users on the machine, | |
396 | for instance with: | |
397 | ||
398 | @example | |
399 | # mkdir -p /usr/local/bin | |
400 | # cd /usr/local/bin | |
d72d05f9 | 401 | # ln -s /var/guix/profiles/per-user/root/guix-profile/bin/guix |
09722b11 | 402 | @end example |
39f8ed14 | 403 | |
aca738f3 LC |
404 | It is also a good idea to make the Info version of this manual available |
405 | there: | |
406 | ||
407 | @example | |
408 | # mkdir -p /usr/local/share/info | |
409 | # cd /usr/local/share/info | |
410 | # for i in /var/guix/profiles/per-user/root/guix-profile/share/info/* ; | |
411 | do ln -s $i ; done | |
412 | @end example | |
413 | ||
414 | That way, assuming @file{/usr/local/share/info} is in the search path, | |
415 | running @command{info guix} will open this manual (@pxref{Other Info | |
416 | Directories,,, texinfo, GNU Texinfo}, for more details on changing the | |
417 | Info search path.) | |
418 | ||
39f8ed14 LC |
419 | @item |
420 | To use substitutes from @code{hydra.gnu.org} (@pxref{Substitutes}), | |
421 | authorize them: | |
422 | ||
423 | @example | |
7acd3439 | 424 | # guix archive --authorize < ~root/.guix-profile/share/guix/hydra.gnu.org.pub |
39f8ed14 | 425 | @end example |
09722b11 LC |
426 | @end enumerate |
427 | ||
53de532f LC |
428 | And that's it! For additional tips and tricks, @pxref{Application |
429 | Setup}. | |
09722b11 | 430 | |
5dc3ce5f | 431 | The @code{guix} package must remain available in @code{root}'s |
09722b11 LC |
432 | profile, or it would become subject to garbage collection---in which |
433 | case you would find yourself badly handicapped by the lack of the | |
434 | @command{guix} command. | |
435 | ||
39f8ed14 LC |
436 | The tarball in question can be (re)produced and verified simply by |
437 | running the following command in the Guix source tree: | |
09722b11 LC |
438 | |
439 | @example | |
440 | make guix-binary.@var{system}.tar.xz | |
441 | @end example | |
442 | ||
443 | ||
bd5e766b LC |
444 | @node Requirements |
445 | @section Requirements | |
446 | ||
09722b11 LC |
447 | This section lists requirements when building Guix from source. The |
448 | build procedure for Guix is the same as for other GNU software, and is | |
449 | not covered here. Please see the files @file{README} and @file{INSTALL} | |
450 | in the Guix source tree for additional details. | |
451 | ||
bd5e766b LC |
452 | GNU Guix depends on the following packages: |
453 | ||
454 | @itemize | |
47c66da0 | 455 | @item @url{http://gnu.org/software/guile/, GNU Guile}, version 2.0.7 or later; |
288dca55 | 456 | @item @url{http://gnupg.org/, GNU libgcrypt}; |
f0b98b84 | 457 | @item @url{http://www.gnu.org/software/make/, GNU Make}. |
8a96bd4b ID |
458 | @end itemize |
459 | ||
460 | The following dependencies are optional: | |
461 | ||
462 | @itemize | |
288dca55 | 463 | @item |
8a96bd4b | 464 | Installing |
288dca55 | 465 | @url{http://savannah.nongnu.org/projects/guile-json/, Guile-JSON} will |
2f7d2d91 LC |
466 | allow you to use the @command{guix import pypi} command (@pxref{Invoking |
467 | guix import}). It is of | |
288dca55 | 468 | interest primarily for developers and not for casual users. |
8a96bd4b ID |
469 | @item |
470 | Installing @uref{http://gnutls.org/, GnuTLS-Guile} will | |
471 | allow you to access @code{https} URLs with the @command{guix download} | |
d45dc6da EB |
472 | command (@pxref{Invoking guix download}), the @command{guix import pypi} |
473 | command, and the @command{guix import cpan} command. This is primarily | |
474 | of interest to developers. @xref{Guile Preparations, how to install the | |
475 | GnuTLS bindings for Guile,, gnutls-guile, GnuTLS-Guile}. | |
bd5e766b LC |
476 | @end itemize |
477 | ||
478 | Unless @code{--disable-daemon} was passed to @command{configure}, the | |
479 | following packages are also needed: | |
480 | ||
481 | @itemize | |
368d08f7 LC |
482 | @item @url{http://sqlite.org, SQLite 3}; |
483 | @item @url{http://www.bzip.org, libbz2}; | |
484 | @item @url{http://gcc.gnu.org, GCC's g++}, with support for the | |
485 | C++11 standard. | |
bd5e766b LC |
486 | @end itemize |
487 | ||
4bfc4ea3 NK |
488 | When a working installation of @url{http://nixos.org/nix/, the Nix package |
489 | manager} is available, you | |
bd5e766b | 490 | can instead configure Guix with @code{--disable-daemon}. In that case, |
4bfc4ea3 | 491 | Nix replaces the three dependencies above. |
bd5e766b | 492 | |
b22a12fd LC |
493 | Guix is compatible with Nix, so it is possible to share the same store |
494 | between both. To do so, you must pass @command{configure} not only the | |
495 | same @code{--with-store-dir} value, but also the same | |
4bfc4ea3 NK |
496 | @code{--localstatedir} value. The latter is essential because it |
497 | specifies where the database that stores metadata about the store is | |
834129e0 | 498 | located, among other things. The default values for Nix are |
b22a12fd | 499 | @code{--with-store-dir=/nix/store} and @code{--localstatedir=/nix/var}. |
4bfc4ea3 NK |
500 | Note that @code{--disable-daemon} is not required if |
501 | your goal is to share the store with Nix. | |
b22a12fd | 502 | |
ec0339cd LC |
503 | @node Running the Test Suite |
504 | @section Running the Test Suite | |
505 | ||
506 | After a successful @command{configure} and @code{make} run, it is a good | |
507 | idea to run the test suite. It can help catch issues with the setup or | |
508 | environment, or bugs in Guix itself---and really, reporting test | |
509 | failures is a good way to help improve the software. To run the test | |
510 | suite, type: | |
511 | ||
512 | @example | |
513 | make check | |
514 | @end example | |
515 | ||
516 | Test cases can run in parallel: you can use the @code{-j} option of | |
517 | GNU@tie{}make to speed things up. The first run may take a few minutes | |
518 | on a recent machine; subsequent runs will be faster because the store | |
519 | that is created for test purposes will already have various things in | |
520 | cache. | |
521 | ||
a887fd8d LC |
522 | It is also possible to run a subset of the tests by defining the |
523 | @code{TESTS} makefile variable as in this example: | |
524 | ||
525 | @example | |
526 | make check TESTS="tests/store.scm tests/cpio.scm" | |
527 | @end example | |
528 | ||
ec0339cd LC |
529 | Upon failure, please email @email{bug-guix@@gnu.org} and attach the |
530 | @file{test-suite.log} file. When @file{tests/@var{something}.scm} | |
531 | fails, please also attach the @file{@var{something}.log} file available | |
532 | in the top-level build directory. Please specify the Guix version being | |
533 | used as well as version numbers of the dependencies | |
534 | (@pxref{Requirements}) in your message. | |
535 | ||
bd5e766b LC |
536 | @node Setting Up the Daemon |
537 | @section Setting Up the Daemon | |
538 | ||
539 | @cindex daemon | |
540 | Operations such as building a package or running the garbage collector | |
49e6291a | 541 | are all performed by a specialized process, the @dfn{build daemon}, on |
bd5e766b LC |
542 | behalf of clients. Only the daemon may access the store and its |
543 | associated database. Thus, any operation that manipulates the store | |
544 | goes through the daemon. For instance, command-line tools such as | |
e49951eb | 545 | @command{guix package} and @command{guix build} communicate with the |
bd5e766b LC |
546 | daemon (@i{via} remote procedure calls) to instruct it what to do. |
547 | ||
49e6291a | 548 | The following sections explain how to prepare the build daemon's |
f97c9175 | 549 | environment. See also @ref{Substitutes}, for information on how to allow |
225dafde | 550 | the daemon to download pre-built binaries. |
49e6291a LC |
551 | |
552 | @menu | |
553 | * Build Environment Setup:: Preparing the isolated build environment. | |
554 | * Daemon Offload Setup:: Offloading builds to remote machines. | |
555 | @end menu | |
556 | ||
557 | @node Build Environment Setup | |
558 | @subsection Build Environment Setup | |
559 | ||
bd5e766b LC |
560 | In a standard multi-user setup, Guix and its daemon---the |
561 | @command{guix-daemon} program---are installed by the system | |
834129e0 | 562 | administrator; @file{/gnu/store} is owned by @code{root} and |
bd5e766b LC |
563 | @command{guix-daemon} runs as @code{root}. Unprivileged users may use |
564 | Guix tools to build packages or otherwise access the store, and the | |
565 | daemon will do it on their behalf, ensuring that the store is kept in a | |
566 | consistent state, and allowing built packages to be shared among users. | |
567 | ||
568 | @cindex build users | |
569 | When @command{guix-daemon} runs as @code{root}, you may not want package | |
570 | build processes themselves to run as @code{root} too, for obvious | |
571 | security reasons. To avoid that, a special pool of @dfn{build users} | |
572 | should be created for use by build processes started by the daemon. | |
573 | These build users need not have a shell and a home directory: they will | |
574 | just be used when the daemon drops @code{root} privileges in build | |
575 | processes. Having several such users allows the daemon to launch | |
576 | distinct build processes under separate UIDs, which guarantees that they | |
577 | do not interfere with each other---an essential feature since builds are | |
578 | regarded as pure functions (@pxref{Introduction}). | |
579 | ||
580 | On a GNU/Linux system, a build user pool may be created like this (using | |
581 | Bash syntax and the @code{shadow} commands): | |
582 | ||
091196b3 LC |
583 | @c See http://lists.gnu.org/archive/html/bug-guix/2013-01/msg00239.html |
584 | @c for why `-G' is needed. | |
bd5e766b | 585 | @example |
cfc149dc LC |
586 | # groupadd --system guixbuild |
587 | # for i in `seq -w 1 10`; | |
bd5e766b | 588 | do |
cfc149dc LC |
589 | useradd -g guixbuild -G guixbuild \ |
590 | -d /var/empty -s `which nologin` \ | |
591 | -c "Guix build user $i" --system \ | |
592 | guixbuilder$i; | |
bd5e766b LC |
593 | done |
594 | @end example | |
595 | ||
596 | @noindent | |
54eb03ab LC |
597 | The number of build users determines how many build jobs may run in |
598 | parallel, as specified by the @option{--max-jobs} option | |
d2825c96 LC |
599 | (@pxref{Invoking guix-daemon, @option{--max-jobs}}). The |
600 | @code{guix-daemon} program may then be run as @code{root} with the | |
601 | following command@footnote{If your machine uses the systemd init system, | |
602 | dropping the @file{@var{prefix}/lib/systemd/system/guix-daemon.service} | |
603 | file in @file{/etc/systemd/system} will ensure that | |
ad227484 MDRS |
604 | @command{guix-daemon} is automatically started. Similarly, if your |
605 | machine uses the Upstart init system, drop the | |
606 | @file{@var{prefix}/lib/upstart/system/guix-daemon.conf} | |
607 | file in @file{/etc/init}.}: | |
bd5e766b LC |
608 | |
609 | @example | |
cfc149dc | 610 | # guix-daemon --build-users-group=guixbuild |
bd5e766b LC |
611 | @end example |
612 | ||
e900c503 | 613 | @cindex chroot |
b095792f LC |
614 | @noindent |
615 | This way, the daemon starts build processes in a chroot, under one of | |
cfc149dc | 616 | the @code{guixbuilder} users. On GNU/Linux, by default, the chroot |
6dc99317 LC |
617 | environment contains nothing but: |
618 | ||
619 | @c Keep this list in sync with libstore/build.cc! ----------------------- | |
620 | @itemize | |
621 | @item | |
4743a4da LC |
622 | a minimal @code{/dev} directory, created mostly independently from the |
623 | host @code{/dev}@footnote{``Mostly'', because while the set of files | |
624 | that appear in the chroot's @code{/dev} is fixed, most of these files | |
625 | can only be created if the host has them.}; | |
626 | ||
627 | @item | |
f97c9175 | 628 | the @code{/proc} directory; it only shows the processes of the container |
4743a4da | 629 | since a separate PID name space is used; |
6dc99317 LC |
630 | |
631 | @item | |
632 | @file{/etc/passwd} with an entry for the current user and an entry for | |
633 | user @file{nobody}; | |
634 | ||
635 | @item | |
636 | @file{/etc/group} with an entry for the user's group; | |
637 | ||
638 | @item | |
639 | @file{/etc/hosts} with an entry that maps @code{localhost} to | |
640 | @code{127.0.0.1}; | |
641 | ||
642 | @item | |
643 | a writable @file{/tmp} directory. | |
644 | @end itemize | |
b095792f | 645 | |
cb960102 ED |
646 | You can influence the directory where the daemon stores build trees |
647 | @i{via} the @code{TMPDIR} environment variable. However, the build tree | |
f97c9175 | 648 | within the chroot is always called @file{/tmp/guix-build-@var{name}.drv-0}, |
cb960102 ED |
649 | where @var{name} is the derivation name---e.g., @code{coreutils-8.24}. |
650 | This way, the value of @code{TMPDIR} does not leak inside build | |
651 | environments, which avoids discrepancies in cases where build processes | |
652 | capture the name of their build tree. | |
653 | ||
e0c941fe LC |
654 | @vindex http_proxy |
655 | The daemon also honors the @code{http_proxy} environment variable for | |
656 | HTTP downloads it performs, be it for fixed-output derivations | |
657 | (@pxref{Derivations}) or for substitutes (@pxref{Substitutes}). | |
658 | ||
1e2644bb LC |
659 | If you are installing Guix as an unprivileged user, it is still possible |
660 | to run @command{guix-daemon} provided you pass @code{--disable-chroot}. | |
661 | However, build processes will not be isolated from one another, and not | |
662 | from the rest of the system. Thus, build processes may interfere with | |
663 | each other, and may access programs, libraries, and other files | |
664 | available on the system---making it much harder to view them as | |
665 | @emph{pure} functions. | |
bd5e766b | 666 | |
49e6291a LC |
667 | |
668 | @node Daemon Offload Setup | |
669 | @subsection Using the Offload Facility | |
670 | ||
671 | @cindex offloading | |
4ec2e92d LC |
672 | @cindex build hook |
673 | When desired, the build daemon can @dfn{offload} | |
674 | derivation builds to other machines | |
49e6291a LC |
675 | running Guix, using the @code{offload} @dfn{build hook}. When that |
676 | feature is enabled, a list of user-specified build machines is read from | |
f97c9175 | 677 | @file{/etc/guix/machines.scm}; every time a build is requested, for |
49e6291a | 678 | instance via @code{guix build}, the daemon attempts to offload it to one |
f97c9175 | 679 | of the machines that satisfy the constraints of the derivation, in |
49e6291a LC |
680 | particular its system type---e.g., @file{x86_64-linux}. Missing |
681 | prerequisites for the build are copied over SSH to the target machine, | |
682 | which then proceeds with the build; upon success the output(s) of the | |
683 | build are copied back to the initial machine. | |
684 | ||
4ec2e92d | 685 | The @file{/etc/guix/machines.scm} file typically looks like this: |
49e6291a LC |
686 | |
687 | @example | |
688 | (list (build-machine | |
689 | (name "eightysix.example.org") | |
690 | (system "x86_64-linux") | |
691 | (user "bob") | |
692 | (speed 2.)) ; incredibly fast! | |
693 | ||
694 | (build-machine | |
695 | (name "meeps.example.org") | |
696 | (system "mips64el-linux") | |
697 | (user "alice") | |
698 | (private-key | |
699 | (string-append (getenv "HOME") | |
c4fdfd6f | 700 | "/.lsh/identity-for-guix")))) |
49e6291a LC |
701 | @end example |
702 | ||
703 | @noindent | |
704 | In the example above we specify a list of two build machines, one for | |
705 | the @code{x86_64} architecture and one for the @code{mips64el} | |
4ec2e92d LC |
706 | architecture. |
707 | ||
708 | In fact, this file is---not surprisingly!---a Scheme file that is | |
709 | evaluated when the @code{offload} hook is started. Its return value | |
710 | must be a list of @code{build-machine} objects. While this example | |
711 | shows a fixed list of build machines, one could imagine, say, using | |
712 | DNS-SD to return a list of potential build machines discovered in the | |
713 | local network (@pxref{Introduction, Guile-Avahi,, guile-avahi, Using | |
c678a4ee LC |
714 | Avahi in Guile Scheme Programs}). The @code{build-machine} data type is |
715 | detailed below. | |
4ec2e92d | 716 | |
c678a4ee | 717 | @deftp {Data Type} build-machine |
f97c9175 AE |
718 | This data type represents build machines to which the daemon may offload |
719 | builds. The important fields are: | |
49e6291a LC |
720 | |
721 | @table @code | |
722 | ||
723 | @item name | |
f97c9175 | 724 | The host name of the remote machine. |
49e6291a LC |
725 | |
726 | @item system | |
f97c9175 | 727 | The system type of the remote machine---e.g., @code{"x86_64-linux"}. |
49e6291a LC |
728 | |
729 | @item user | |
730 | The user account to use when connecting to the remote machine over SSH. | |
731 | Note that the SSH key pair must @emph{not} be passphrase-protected, to | |
732 | allow non-interactive logins. | |
733 | ||
734 | @end table | |
735 | ||
4ec2e92d | 736 | A number of optional fields may be specified: |
49e6291a LC |
737 | |
738 | @table @code | |
739 | ||
cecd72d5 | 740 | @item port |
f97c9175 | 741 | Port number of SSH server on the machine (default: 22). |
cecd72d5 | 742 | |
49e6291a LC |
743 | @item private-key |
744 | The SSH private key file to use when connecting to the machine. | |
745 | ||
c4fdfd6f LC |
746 | Currently offloading uses GNU@tie{}lsh as its SSH client |
747 | (@pxref{Invoking lsh,,, GNU lsh Manual}). Thus, the key file here must | |
748 | be an lsh key file. This may change in the future, though. | |
749 | ||
49e6291a LC |
750 | @item parallel-builds |
751 | The number of builds that may run in parallel on the machine (1 by | |
752 | default.) | |
753 | ||
754 | @item speed | |
755 | A ``relative speed factor''. The offload scheduler will tend to prefer | |
756 | machines with a higher speed factor. | |
757 | ||
758 | @item features | |
759 | A list of strings denoting specific features supported by the machine. | |
760 | An example is @code{"kvm"} for machines that have the KVM Linux modules | |
761 | and corresponding hardware support. Derivations can request features by | |
762 | name, and they will be scheduled on matching build machines. | |
763 | ||
764 | @end table | |
c678a4ee | 765 | @end deftp |
49e6291a LC |
766 | |
767 | The @code{guix} command must be in the search path on the build | |
768 | machines, since offloading works by invoking the @code{guix archive} and | |
c4fdfd6f LC |
769 | @code{guix build} commands. In addition, the Guix modules must be in |
770 | @code{$GUILE_LOAD_PATH} on the build machine---you can check whether | |
771 | this is the case by running: | |
772 | ||
773 | @example | |
74273b6f | 774 | lsh build-machine guile -c "'(use-modules (guix config))'" |
c4fdfd6f | 775 | @end example |
49e6291a | 776 | |
f97c9175 | 777 | There is one last thing to do once @file{machines.scm} is in place. As |
49e6291a | 778 | explained above, when offloading, files are transferred back and forth |
c4fdfd6f LC |
779 | between the machine stores. For this to work, you first need to |
780 | generate a key pair on each machine to allow the daemon to export signed | |
781 | archives of files from the store (@pxref{Invoking guix archive}): | |
49e6291a LC |
782 | |
783 | @example | |
784 | # guix archive --generate-key | |
785 | @end example | |
786 | ||
787 | @noindent | |
c4fdfd6f LC |
788 | Each build machine must authorize the key of the master machine so that |
789 | it accepts store items it receives from the master: | |
790 | ||
791 | @example | |
792 | # guix archive --authorize < master-public-key.txt | |
793 | @end example | |
794 | ||
795 | @noindent | |
796 | Likewise, the master machine must authorize the key of each build machine. | |
797 | ||
798 | All the fuss with keys is here to express pairwise mutual trust | |
799 | relations between the master and the build machines. Concretely, when | |
800 | the master receives files from a build machine (and @i{vice versa}), its | |
801 | build daemon can make sure they are genuine, have not been tampered | |
802 | with, and that they are signed by an authorized key. | |
49e6291a LC |
803 | |
804 | ||
bd5e766b LC |
805 | @node Invoking guix-daemon |
806 | @section Invoking @command{guix-daemon} | |
807 | ||
808 | The @command{guix-daemon} program implements all the functionality to | |
809 | access the store. This includes launching build processes, running the | |
810 | garbage collector, querying the availability of a build result, etc. It | |
811 | is normally run as @code{root} like this: | |
812 | ||
813 | @example | |
cfc149dc | 814 | # guix-daemon --build-users-group=guixbuild |
bd5e766b LC |
815 | @end example |
816 | ||
817 | @noindent | |
081145cf | 818 | For details on how to set it up, @pxref{Setting Up the Daemon}. |
bd5e766b | 819 | |
e900c503 LC |
820 | @cindex chroot |
821 | @cindex container, build environment | |
822 | @cindex build environment | |
823 | @cindex reproducible builds | |
bd5e766b LC |
824 | By default, @command{guix-daemon} launches build processes under |
825 | different UIDs, taken from the build group specified with | |
826 | @code{--build-users-group}. In addition, each build process is run in a | |
827 | chroot environment that only contains the subset of the store that the | |
828 | build process depends on, as specified by its derivation | |
829 | (@pxref{Programming Interface, derivation}), plus a set of specific | |
830 | system directories. By default, the latter contains @file{/dev} and | |
e900c503 LC |
831 | @file{/dev/pts}. Furthermore, on GNU/Linux, the build environment is a |
832 | @dfn{container}: in addition to having its own file system tree, it has | |
833 | a separate mount name space, its own PID name space, network name space, | |
834 | etc. This helps achieve reproducible builds (@pxref{Features}). | |
bd5e766b | 835 | |
cbc538fe LC |
836 | When the daemon performs a build on behalf of the user, it creates a |
837 | build directory under @file{/tmp} or under the directory specified by | |
838 | its @code{TMPDIR} environment variable; this directory is shared with | |
839 | the container for the duration of the build. Be aware that using a | |
840 | directory other than @file{/tmp} can affect build results---for example, | |
841 | with a longer directory name, a build process that uses Unix-domain | |
842 | sockets might hit the name length limitation for @code{sun_path}, which | |
843 | it would otherwise not hit. | |
844 | ||
845 | The build directory is automatically deleted upon completion, unless the | |
846 | build failed and the client specified @option{--keep-failed} | |
847 | (@pxref{Invoking guix build, @option{--keep-failed}}). | |
848 | ||
bd5e766b LC |
849 | The following command-line options are supported: |
850 | ||
851 | @table @code | |
852 | @item --build-users-group=@var{group} | |
853 | Take users from @var{group} to run build processes (@pxref{Setting Up | |
854 | the Daemon, build users}). | |
855 | ||
6858f9d1 | 856 | @item --no-substitutes |
b5385b52 | 857 | @cindex substitutes |
6858f9d1 | 858 | Do not use substitutes for build products. That is, always build things |
c4202d60 LC |
859 | locally instead of allowing downloads of pre-built binaries |
860 | (@pxref{Substitutes}). | |
6858f9d1 | 861 | |
b5385b52 LC |
862 | By default substitutes are used, unless the client---such as the |
863 | @command{guix package} command---is explicitly invoked with | |
864 | @code{--no-substitutes}. | |
865 | ||
866 | When the daemon runs with @code{--no-substitutes}, clients can still | |
867 | explicitly enable substitution @i{via} the @code{set-build-options} | |
868 | remote procedure call (@pxref{The Store}). | |
869 | ||
9176607e | 870 | @item --substitute-urls=@var{urls} |
f8a8e0fe | 871 | @anchor{daemon-substitute-urls} |
9176607e | 872 | Consider @var{urls} the default whitespace-separated list of substitute |
ae806096 | 873 | source URLs. When this option is omitted, @indicateurl{http://hydra.gnu.org} |
9176607e LC |
874 | is used. |
875 | ||
876 | This means that substitutes may be downloaded from @var{urls}, as long | |
877 | as they are signed by a trusted signature (@pxref{Substitutes}). | |
878 | ||
4ec2e92d LC |
879 | @cindex build hook |
880 | @item --no-build-hook | |
881 | Do not use the @dfn{build hook}. | |
882 | ||
883 | The build hook is a helper program that the daemon can start and to | |
884 | which it submits build requests. This mechanism is used to offload | |
885 | builds to other machines (@pxref{Daemon Offload Setup}). | |
886 | ||
bd5e766b LC |
887 | @item --cache-failures |
888 | Cache build failures. By default, only successful builds are cached. | |
889 | ||
30d9aa54 LC |
890 | When this option is used, @command{guix gc --list-failures} can be used |
891 | to query the set of store items marked as failed; @command{guix gc | |
892 | --clear-failures} removes store items from the set of cached failures. | |
893 | @xref{Invoking guix gc}. | |
894 | ||
bd5e766b LC |
895 | @item --cores=@var{n} |
896 | @itemx -c @var{n} | |
897 | Use @var{n} CPU cores to build each derivation; @code{0} means as many | |
898 | as available. | |
899 | ||
6efc160e | 900 | The default value is @code{0}, but it may be overridden by clients, such |
e49951eb MW |
901 | as the @code{--cores} option of @command{guix build} (@pxref{Invoking |
902 | guix build}). | |
bd5e766b LC |
903 | |
904 | The effect is to define the @code{NIX_BUILD_CORES} environment variable | |
905 | in the build process, which can then use it to exploit internal | |
906 | parallelism---for instance, by running @code{make -j$NIX_BUILD_CORES}. | |
907 | ||
908 | @item --max-jobs=@var{n} | |
909 | @itemx -M @var{n} | |
910 | Allow at most @var{n} build jobs in parallel. The default value is | |
f6526eb3 LC |
911 | @code{1}. Setting it to @code{0} means that no builds will be performed |
912 | locally; instead, the daemon will offload builds (@pxref{Daemon Offload | |
913 | Setup}), or simply fail. | |
bd5e766b | 914 | |
ecf84b7c LC |
915 | @item --rounds=@var{N} |
916 | Build each derivation @var{n} times in a row, and raise an error if | |
917 | consecutive build results are not bit-for-bit identical. Note that this | |
918 | setting can be overridden by clients such as @command{guix build} | |
919 | (@pxref{Invoking guix build}). | |
920 | ||
bd5e766b LC |
921 | @item --debug |
922 | Produce debugging output. | |
923 | ||
924 | This is useful to debug daemon start-up issues, but then it may be | |
925 | overridden by clients, for example the @code{--verbosity} option of | |
e49951eb | 926 | @command{guix build} (@pxref{Invoking guix build}). |
bd5e766b LC |
927 | |
928 | @item --chroot-directory=@var{dir} | |
929 | Add @var{dir} to the build chroot. | |
930 | ||
931 | Doing this may change the result of build processes---for instance if | |
932 | they use optional dependencies found in @var{dir} when it is available, | |
933 | and not otherwise. For that reason, it is not recommended to do so. | |
934 | Instead, make sure that each derivation declares all the inputs that it | |
935 | needs. | |
936 | ||
937 | @item --disable-chroot | |
938 | Disable chroot builds. | |
939 | ||
940 | Using this option is not recommended since, again, it would allow build | |
1e2644bb LC |
941 | processes to gain access to undeclared dependencies. It is necessary, |
942 | though, when @command{guix-daemon} is running under an unprivileged user | |
943 | account. | |
bd5e766b LC |
944 | |
945 | @item --disable-log-compression | |
946 | Disable compression of the build logs. | |
947 | ||
1da983b9 LC |
948 | Unless @code{--lose-logs} is used, all the build logs are kept in the |
949 | @var{localstatedir}. To save space, the daemon automatically compresses | |
950 | them with bzip2 by default. This option disables that. | |
951 | ||
ab3893d7 LC |
952 | @item --disable-deduplication |
953 | @cindex deduplication | |
bd5e766b LC |
954 | Disable automatic file ``deduplication'' in the store. |
955 | ||
1da983b9 | 956 | By default, files added to the store are automatically ``deduplicated'': |
ab3893d7 LC |
957 | if a newly added file is identical to another one found in the store, |
958 | the daemon makes the new file a hard link to the other file. This can | |
4988dd40 | 959 | noticeably reduce disk usage, at the expense of slightly increased |
ab3893d7 LC |
960 | input/output load at the end of a build process. This option disables |
961 | this optimization. | |
1da983b9 | 962 | |
6e37066e LC |
963 | @item --gc-keep-outputs[=yes|no] |
964 | Tell whether the garbage collector (GC) must keep outputs of live | |
965 | derivations. | |
966 | ||
967 | When set to ``yes'', the GC will keep the outputs of any live derivation | |
968 | available in the store---the @code{.drv} files. The default is ``no'', | |
969 | meaning that derivation outputs are kept only if they are GC roots. | |
970 | ||
971 | @item --gc-keep-derivations[=yes|no] | |
972 | Tell whether the garbage collector (GC) must keep derivations | |
973 | corresponding to live outputs. | |
974 | ||
975 | When set to ``yes'', as is the case by default, the GC keeps | |
976 | derivations---i.e., @code{.drv} files---as long as at least one of their | |
977 | outputs is live. This allows users to keep track of the origins of | |
978 | items in their store. Setting it to ``no'' saves a bit of disk space. | |
979 | ||
980 | Note that when both @code{--gc-keep-derivations} and | |
981 | @code{--gc-keep-outputs} are used, the effect is to keep all the build | |
982 | prerequisites (the sources, compiler, libraries, and other build-time | |
983 | tools) of live objects in the store, regardless of whether these | |
984 | prerequisites are live. This is convenient for developers since it | |
985 | saves rebuilds or downloads. | |
986 | ||
bd5e766b LC |
987 | @item --impersonate-linux-2.6 |
988 | On Linux-based systems, impersonate Linux 2.6. This means that the | |
989 | kernel's @code{uname} system call will report 2.6 as the release number. | |
990 | ||
991 | This might be helpful to build programs that (usually wrongfully) depend | |
992 | on the kernel version number. | |
993 | ||
994 | @item --lose-logs | |
995 | Do not keep build logs. By default they are kept under | |
ce33631f | 996 | @code{@var{localstatedir}/guix/log}. |
bd5e766b LC |
997 | |
998 | @item --system=@var{system} | |
999 | Assume @var{system} as the current system type. By default it is the | |
1000 | architecture/kernel pair found at configure time, such as | |
1001 | @code{x86_64-linux}. | |
b8d2aa26 LC |
1002 | |
1003 | @item --listen=@var{socket} | |
1004 | Listen for connections on @var{socket}, the file name of a Unix-domain | |
1005 | socket. The default socket is | |
1006 | @file{@var{localstatedir}/daemon-socket/socket}. This option is only | |
1007 | useful in exceptional circumstances, such as if you need to run several | |
1008 | daemons on the same machine. | |
bd5e766b LC |
1009 | @end table |
1010 | ||
1011 | ||
0e2d0213 LC |
1012 | @node Application Setup |
1013 | @section Application Setup | |
1014 | ||
85e57214 LC |
1015 | When using Guix on top of GNU/Linux distribution other than GuixSD---a |
1016 | so-called @dfn{foreign distro}---a few additional steps are needed to | |
1017 | get everything in place. Here are some of them. | |
0e2d0213 LC |
1018 | |
1019 | @subsection Locales | |
1020 | ||
5c3c1427 | 1021 | @anchor{locales-and-locpath} |
0e2d0213 | 1022 | @cindex locales, when not on GuixSD |
5c3c1427 | 1023 | @vindex LOCPATH |
85e57214 | 1024 | @vindex GUIX_LOCPATH |
f97c9175 AE |
1025 | Packages installed @i{via} Guix will not use the locale data of the |
1026 | host system. Instead, you must first install one of the locale packages | |
85e57214 LC |
1027 | available with Guix and then define the @code{GUIX_LOCPATH} environment |
1028 | variable: | |
0e2d0213 LC |
1029 | |
1030 | @example | |
1031 | $ guix package -i glibc-locales | |
85e57214 | 1032 | $ export GUIX_LOCPATH=$HOME/.guix-profile/lib/locale |
0e2d0213 LC |
1033 | @end example |
1034 | ||
1035 | Note that the @code{glibc-locales} package contains data for all the | |
1036 | locales supported by the GNU@tie{}libc and weighs in at around | |
f97c9175 | 1037 | 110@tie{}MiB. Alternatively, the @code{glibc-utf8-locales} is smaller but |
0e2d0213 LC |
1038 | limited to a few UTF-8 locales. |
1039 | ||
85e57214 LC |
1040 | The @code{GUIX_LOCPATH} variable plays a role similar to @code{LOCPATH} |
1041 | (@pxref{Locale Names, @code{LOCPATH},, libc, The GNU C Library Reference | |
1042 | Manual}). There are two important differences though: | |
1043 | ||
1044 | @enumerate | |
1045 | @item | |
f97c9175 | 1046 | @code{GUIX_LOCPATH} is honored only by the libc in Guix, and not by the libc |
85e57214 | 1047 | provided by foreign distros. Thus, using @code{GUIX_LOCPATH} allows you |
f97c9175 | 1048 | to make sure the programs of the foreign distro will not end up loading |
85e57214 LC |
1049 | incompatible locale data. |
1050 | ||
1051 | @item | |
1052 | libc suffixes each entry of @code{GUIX_LOCPATH} with @code{/X.Y}, where | |
1053 | @code{X.Y} is the libc version---e.g., @code{2.22}. This means that, | |
1054 | should your Guix profile contain a mixture of programs linked against | |
1055 | different libc version, each libc version will only try to load locale | |
1056 | data in the right format. | |
1057 | @end enumerate | |
1058 | ||
1059 | This is important because the locale data format used by different libc | |
1060 | versions may be incompatible. | |
1061 | ||
0e2d0213 LC |
1062 | @subsection X11 Fonts |
1063 | ||
4988dd40 | 1064 | The majority of graphical applications use Fontconfig to locate and |
f97c9175 AE |
1065 | load fonts and perform X11-client-side rendering. The @code{fontconfig} |
1066 | package in Guix looks for fonts in @file{$HOME/.guix-profile} | |
0e2d0213 | 1067 | by default. Thus, to allow graphical applications installed with Guix |
f97c9175 | 1068 | to display fonts, you have to install fonts with Guix as well. |
0e2d0213 | 1069 | Essential font packages include @code{gs-fonts}, @code{font-dejavu}, and |
8fe5b1d1 | 1070 | @code{font-gnu-freefont-ttf}. |
0e2d0213 | 1071 | |
5c36edc8 LC |
1072 | To display text written in Chinese languages, Japanese, or Korean in |
1073 | graphical applications, consider installing | |
1074 | @code{font-adobe-source-han-sans} or @code{font-wqy-zenhei}. The former | |
1075 | has multiple outputs, one per language family (@pxref{Packages with | |
1076 | Multiple Outputs}). For instance, the following command installs fonts | |
1077 | for Chinese languages: | |
1078 | ||
1079 | @example | |
1080 | guix package -i font-adobe-source-han-sans:cn | |
1081 | @end example | |
1082 | ||
6d97319c AK |
1083 | @subsection Emacs Packages |
1084 | ||
1085 | When you install Emacs packages with Guix, the elisp files may be placed | |
1086 | either in @file{$HOME/.guix-profile/share/emacs/site-lisp/} or in | |
1087 | sub-directories of | |
1088 | @file{$HOME/.guix-profile/share/emacs/site-lisp/guix.d/}. The latter | |
1089 | directory exists because potentially there may exist thousands of Emacs | |
1090 | packages and storing all their files in a single directory may be not | |
1091 | reliable (because of name conflicts). So we think using a separate | |
1092 | directory for each package is a good idea. It is very similar to how | |
1093 | the Emacs package system organizes the file structure (@pxref{Package | |
1094 | Files,,, emacs, The GNU Emacs Manual}). | |
1095 | ||
1096 | By default, Emacs (installed with Guix) ``knows'' where these packages | |
f97c9175 | 1097 | are placed, so you do not need to perform any configuration. If, for |
6d97319c | 1098 | some reason, you want to avoid auto-loading Emacs packages installed |
f97c9175 | 1099 | with Guix, you can do so by running Emacs with @code{--no-site-file} |
6d97319c AK |
1100 | option (@pxref{Init File,,, emacs, The GNU Emacs Manual}). |
1101 | ||
0e2d0213 LC |
1102 | @c TODO What else? |
1103 | ||
eeaf4427 LC |
1104 | @c ********************************************************************* |
1105 | @node Package Management | |
1106 | @chapter Package Management | |
1107 | ||
f8348b91 | 1108 | The purpose of GNU Guix is to allow users to easily install, upgrade, and |
eeaf4427 | 1109 | remove software packages, without having to know about their build |
f97c9175 | 1110 | procedures or dependencies. Guix also goes beyond this obvious set of |
eeaf4427 LC |
1111 | features. |
1112 | ||
1113 | This chapter describes the main features of Guix, as well as the package | |
c1941588 | 1114 | management tools it provides. Two user interfaces are provided for |
c554de89 AK |
1115 | routine package management tasks: A command-line interface described below |
1116 | (@pxref{Invoking guix package, @code{guix package}}), as well as a visual user | |
1117 | interface in Emacs described in a subsequent chapter (@pxref{Emacs Interface}). | |
eeaf4427 LC |
1118 | |
1119 | @menu | |
1120 | * Features:: How Guix will make your life brighter. | |
e49951eb | 1121 | * Invoking guix package:: Package installation, removal, etc. |
c4202d60 | 1122 | * Substitutes:: Downloading pre-built binaries. |
760c60d6 | 1123 | * Packages with Multiple Outputs:: Single source package, multiple outputs. |
e49951eb | 1124 | * Invoking guix gc:: Running the garbage collector. |
f651b477 | 1125 | * Invoking guix pull:: Fetching the latest Guix and distribution. |
760c60d6 | 1126 | * Invoking guix archive:: Exporting and importing store files. |
eeaf4427 LC |
1127 | @end menu |
1128 | ||
1129 | @node Features | |
1130 | @section Features | |
1131 | ||
1132 | When using Guix, each package ends up in the @dfn{package store}, in its | |
1133 | own directory---something that resembles | |
9a130e19 AK |
1134 | @file{/gnu/store/xxx-package-1.2}, where @code{xxx} is a base32 string |
1135 | (note that Guix comes with an Emacs extension to shorten those file | |
081145cf | 1136 | names, @pxref{Emacs Prettify}.) |
eeaf4427 LC |
1137 | |
1138 | Instead of referring to these directories, users have their own | |
1139 | @dfn{profile}, which points to the packages that they actually want to | |
821b0015 LC |
1140 | use. These profiles are stored within each user's home directory, at |
1141 | @code{$HOME/.guix-profile}. | |
eeaf4427 | 1142 | |
821b0015 | 1143 | For example, @code{alice} installs GCC 4.7.2. As a result, |
eeaf4427 | 1144 | @file{/home/alice/.guix-profile/bin/gcc} points to |
834129e0 | 1145 | @file{/gnu/store/@dots{}-gcc-4.7.2/bin/gcc}. Now, on the same machine, |
821b0015 LC |
1146 | @code{bob} had already installed GCC 4.8.0. The profile of @code{bob} |
1147 | simply continues to point to | |
834129e0 | 1148 | @file{/gnu/store/@dots{}-gcc-4.8.0/bin/gcc}---i.e., both versions of GCC |
821b0015 | 1149 | coexist on the same system without any interference. |
eeaf4427 | 1150 | |
e49951eb | 1151 | The @command{guix package} command is the central tool to manage |
f97c9175 | 1152 | packages (@pxref{Invoking guix package}). It operates on the per-user |
821b0015 | 1153 | profiles, and can be used @emph{with normal user privileges}. |
eeaf4427 LC |
1154 | |
1155 | The command provides the obvious install, remove, and upgrade | |
1156 | operations. Each invocation is actually a @emph{transaction}: either | |
ba55b1cb | 1157 | the specified operation succeeds, or nothing happens. Thus, if the |
e49951eb | 1158 | @command{guix package} process is terminated during the transaction, |
eeaf4427 LC |
1159 | or if a power outage occurs during the transaction, then the user's |
1160 | profile remains in its previous state, and remains usable. | |
1161 | ||
1162 | In addition, any package transaction may be @emph{rolled back}. So, if, | |
1163 | for example, an upgrade installs a new version of a package that turns | |
1164 | out to have a serious bug, users may roll back to the previous instance | |
4af2447e LC |
1165 | of their profile, which was known to work well. Similarly, the global |
1166 | system configuration is subject to transactional upgrades and roll-back | |
1167 | (@pxref{Using the Configuration System}). | |
eeaf4427 | 1168 | |
f97c9175 AE |
1169 | All packages in the package store may be @emph{garbage-collected}. |
1170 | Guix can determine which packages are still referenced by user | |
fe8ff028 | 1171 | profiles, and remove those that are provably no longer referenced |
e49951eb | 1172 | (@pxref{Invoking guix gc}). Users may also explicitly remove old |
fe8ff028 LC |
1173 | generations of their profile so that the packages they refer to can be |
1174 | collected. | |
eeaf4427 | 1175 | |
e900c503 LC |
1176 | @cindex reproducibility |
1177 | @cindex reproducible builds | |
eeaf4427 LC |
1178 | Finally, Guix takes a @dfn{purely functional} approach to package |
1179 | management, as described in the introduction (@pxref{Introduction}). | |
834129e0 | 1180 | Each @file{/gnu/store} package directory name contains a hash of all the |
eeaf4427 LC |
1181 | inputs that were used to build that package---compiler, libraries, build |
1182 | scripts, etc. This direct correspondence allows users to make sure a | |
1183 | given package installation matches the current state of their | |
e900c503 LC |
1184 | distribution. It also helps maximize @dfn{build reproducibility}: |
1185 | thanks to the isolated build environments that are used, a given build | |
1186 | is likely to yield bit-identical files when performed on different | |
1187 | machines (@pxref{Invoking guix-daemon, container}). | |
eeaf4427 | 1188 | |
c4202d60 | 1189 | @cindex substitutes |
eeaf4427 | 1190 | This foundation allows Guix to support @dfn{transparent binary/source |
c4202d60 | 1191 | deployment}. When a pre-built binary for a @file{/gnu/store} item is |
18f2887b | 1192 | available from an external source---a @dfn{substitute}, Guix just |
c4202d60 LC |
1193 | downloads it and unpacks it; |
1194 | otherwise, it builds the package from source, locally | |
1195 | (@pxref{Substitutes}). | |
eeaf4427 | 1196 | |
f5fd4fd2 LC |
1197 | Control over the build environment is a feature that is also useful for |
1198 | developers. The @command{guix environment} command allows developers of | |
1199 | a package to quickly set up the right development environment for their | |
f97c9175 AE |
1200 | package, without having to manually install the dependencies of the |
1201 | package into their profile (@pxref{Invoking guix environment}). | |
f5fd4fd2 | 1202 | |
e49951eb MW |
1203 | @node Invoking guix package |
1204 | @section Invoking @command{guix package} | |
eeaf4427 | 1205 | |
e49951eb | 1206 | The @command{guix package} command is the tool that allows users to |
eeaf4427 LC |
1207 | install, upgrade, and remove packages, as well as rolling back to |
1208 | previous configurations. It operates only on the user's own profile, | |
1209 | and works with normal user privileges (@pxref{Features}). Its syntax | |
1210 | is: | |
1211 | ||
1212 | @example | |
e49951eb | 1213 | guix package @var{options} |
eeaf4427 LC |
1214 | @end example |
1215 | ||
ba55b1cb | 1216 | Primarily, @var{options} specifies the operations to be performed during |
eeaf4427 | 1217 | the transaction. Upon completion, a new profile is created, but |
99bd74d5 | 1218 | previous @dfn{generations} of the profile remain available, should the user |
eeaf4427 LC |
1219 | want to roll back. |
1220 | ||
6447738c MW |
1221 | For example, to remove @code{lua} and install @code{guile} and |
1222 | @code{guile-cairo} in a single transaction: | |
1223 | ||
1224 | @example | |
1225 | guix package -r lua -i guile guile-cairo | |
1226 | @end example | |
1227 | ||
99bd74d5 LC |
1228 | @command{guix package} also supports a @dfn{declarative approach} |
1229 | whereby the user specifies the exact set of packages to be available and | |
1230 | passes it @i{via} the @option{--manifest} option | |
1231 | (@pxref{profile-manifest, @option{--manifest}}). | |
1232 | ||
b9e5c0a9 | 1233 | For each user, a symlink to the user's default profile is automatically |
0ec1af59 | 1234 | created in @file{$HOME/.guix-profile}. This symlink always points to the |
b9e5c0a9 LC |
1235 | current generation of the user's default profile. Thus, users can add |
1236 | @file{$HOME/.guix-profile/bin} to their @code{PATH} environment | |
1237 | variable, and so on. | |
d664f1b4 LC |
1238 | @cindex search paths |
1239 | If you are not using the Guix System Distribution, consider adding the | |
1240 | following lines to your @file{~/.bash_profile} (@pxref{Bash Startup | |
1241 | Files,,, bash, The GNU Bash Reference Manual}) so that newly-spawned | |
1242 | shells get all the right environment variable definitions: | |
1243 | ||
1244 | @example | |
1245 | GUIX_PROFILE="$HOME/.guix-profile" \ | |
1246 | source "$HOME/.guix-profile/etc/profile" | |
1247 | @end example | |
b9e5c0a9 | 1248 | |
4379c35b LC |
1249 | In a multi-user setup, user profiles are stored in a place registered as |
1250 | a @dfn{garbage-collector root}, which @file{$HOME/.guix-profile} points | |
1251 | to (@pxref{Invoking guix gc}). That directory is normally | |
0ec1af59 LC |
1252 | @code{@var{localstatedir}/profiles/per-user/@var{user}}, where |
1253 | @var{localstatedir} is the value passed to @code{configure} as | |
4379c35b LC |
1254 | @code{--localstatedir}, and @var{user} is the user name. The |
1255 | @file{per-user} directory is created when @command{guix-daemon} is | |
1256 | started, and the @var{user} sub-directory is created by @command{guix | |
1257 | package}. | |
0ec1af59 LC |
1258 | |
1259 | The @var{options} can be among the following: | |
1260 | ||
eeaf4427 LC |
1261 | @table @code |
1262 | ||
6447738c MW |
1263 | @item --install=@var{package} @dots{} |
1264 | @itemx -i @var{package} @dots{} | |
1265 | Install the specified @var{package}s. | |
eeaf4427 | 1266 | |
6447738c | 1267 | Each @var{package} may specify either a simple package name, such as |
eeaf4427 | 1268 | @code{guile}, or a package name followed by a hyphen and version number, |
724311a2 LC |
1269 | such as @code{guile-1.8.8} or simply @code{guile-1.8} (in the latter |
1270 | case, the newest version prefixed by @code{1.8} is selected.) | |
1271 | ||
1272 | If no version number is specified, the | |
dc5669cd MW |
1273 | newest available version will be selected. In addition, @var{package} |
1274 | may contain a colon, followed by the name of one of the outputs of the | |
6e721c4d | 1275 | package, as in @code{gcc:doc} or @code{binutils-2.22:lib} |
e7f34eb0 LC |
1276 | (@pxref{Packages with Multiple Outputs}). Packages with a corresponding |
1277 | name (and optionally version) are searched for among the GNU | |
1278 | distribution modules (@pxref{Package Modules}). | |
eeaf4427 | 1279 | |
461572cc LC |
1280 | @cindex propagated inputs |
1281 | Sometimes packages have @dfn{propagated inputs}: these are dependencies | |
21461f27 LC |
1282 | that automatically get installed along with the required package |
1283 | (@pxref{package-propagated-inputs, @code{propagated-inputs} in | |
1284 | @code{package} objects}, for information about propagated inputs in | |
1285 | package definitions). | |
461572cc | 1286 | |
21461f27 | 1287 | @anchor{package-cmd-propagated-inputs} |
461572cc LC |
1288 | An example is the GNU MPC library: its C header files refer to those of |
1289 | the GNU MPFR library, which in turn refer to those of the GMP library. | |
1290 | Thus, when installing MPC, the MPFR and GMP libraries also get installed | |
1291 | in the profile; removing MPC also removes MPFR and GMP---unless they had | |
f97c9175 | 1292 | also been explicitly installed by the user. |
461572cc | 1293 | |
ba7ea5ce | 1294 | Besides, packages sometimes rely on the definition of environment |
5924080d | 1295 | variables for their search paths (see explanation of |
ba7ea5ce | 1296 | @code{--search-paths} below). Any missing or possibly incorrect |
5924080d LC |
1297 | environment variable definitions are reported here. |
1298 | ||
ef010c0f | 1299 | @c XXX: keep me up-to-date |
5924080d | 1300 | Finally, when installing a GNU package, the tool reports the |
ef010c0f LC |
1301 | availability of a newer upstream version. In the future, it may provide |
1302 | the option of installing directly from the upstream version, even if | |
1303 | that version is not yet in the distribution. | |
1304 | ||
5d4b411f LC |
1305 | @item --install-from-expression=@var{exp} |
1306 | @itemx -e @var{exp} | |
1307 | Install the package @var{exp} evaluates to. | |
1308 | ||
1309 | @var{exp} must be a Scheme expression that evaluates to a | |
1310 | @code{<package>} object. This option is notably useful to disambiguate | |
1311 | between same-named variants of a package, with expressions such as | |
1312 | @code{(@@ (gnu packages base) guile-final)}. | |
1313 | ||
1314 | Note that this option installs the first output of the specified | |
1315 | package, which may be insufficient when needing a specific output of a | |
1316 | multiple-output package. | |
1317 | ||
0d279400 DT |
1318 | @item --install-from-file=@var{file} |
1319 | @itemx -f @var{file} | |
1320 | Install the package that the code within @var{file} evaluates to. | |
1321 | ||
1322 | As an example, @var{file} might contain a definition like this | |
1323 | (@pxref{Defining Packages}): | |
1324 | ||
1325 | @example | |
1326 | @verbatiminclude package-hello.scm | |
1327 | @end example | |
1328 | ||
1329 | Developers may find it useful to include such a @file{package.scm} file | |
f97c9175 | 1330 | in the root of their project source tree that can be used to test |
0d279400 DT |
1331 | development snapshots and create reproducible development environments |
1332 | (@pxref{Invoking guix environment}). | |
1333 | ||
6447738c MW |
1334 | @item --remove=@var{package} @dots{} |
1335 | @itemx -r @var{package} @dots{} | |
1336 | Remove the specified @var{package}s. | |
eeaf4427 | 1337 | |
6447738c | 1338 | As for @code{--install}, each @var{package} may specify a version number |
13ed095c LC |
1339 | and/or output name in addition to the package name. For instance, |
1340 | @code{-r glibc:debug} would remove the @code{debug} output of | |
1341 | @code{glibc}. | |
1342 | ||
6447738c MW |
1343 | @item --upgrade[=@var{regexp} @dots{}] |
1344 | @itemx -u [@var{regexp} @dots{}] | |
1345 | Upgrade all the installed packages. If one or more @var{regexp}s are | |
1346 | specified, upgrade only installed packages whose name matches a | |
d5f01e48 | 1347 | @var{regexp}. Also see the @code{--do-not-upgrade} option below. |
eeaf4427 | 1348 | |
f651b477 LC |
1349 | Note that this upgrades package to the latest version of packages found |
1350 | in the distribution currently installed. To update your distribution, | |
1351 | you should regularly run @command{guix pull} (@pxref{Invoking guix | |
1352 | pull}). | |
1353 | ||
d5f01e48 MW |
1354 | @item --do-not-upgrade[=@var{regexp} @dots{}] |
1355 | When used together with the @code{--upgrade} option, do @emph{not} | |
1356 | upgrade any packages whose name matches a @var{regexp}. For example, to | |
1357 | upgrade all packages in the current profile except those containing the | |
1358 | substring ``emacs'': | |
1359 | ||
1360 | @example | |
1361 | $ guix package --upgrade . --do-not-upgrade emacs | |
1362 | @end example | |
1363 | ||
99bd74d5 | 1364 | @item @anchor{profile-manifest}--manifest=@var{file} |
1b676447 | 1365 | @itemx -m @var{file} |
99bd74d5 LC |
1366 | @cindex profile declaration |
1367 | @cindex profile manifest | |
1368 | Create a new generation of the profile from the manifest object | |
1b676447 DT |
1369 | returned by the Scheme code in @var{file}. |
1370 | ||
99bd74d5 LC |
1371 | This allows you to @emph{declare} the profile's contents rather than |
1372 | constructing it through a sequence of @code{--install} and similar | |
1373 | commands. The advantage is that @var{file} can be put under version | |
1374 | control, copied to different machines to reproduce the same profile, and | |
1375 | so on. | |
1376 | ||
1377 | @c FIXME: Add reference to (guix profile) documentation when available. | |
1378 | @var{file} must return a @dfn{manifest} object, which is roughly a list | |
1379 | of packages: | |
1b676447 | 1380 | |
99bd74d5 | 1381 | @findex packages->manifest |
1b676447 | 1382 | @example |
99bd74d5 | 1383 | (use-package-modules guile emacs) |
1b676447 DT |
1384 | |
1385 | (packages->manifest | |
99bd74d5 LC |
1386 | (list emacs |
1387 | guile-2.0 | |
1b676447 | 1388 | ;; Use a specific package output. |
99bd74d5 | 1389 | (list guile-2.0 "debug"))) |
1b676447 DT |
1390 | @end example |
1391 | ||
24e262f0 LC |
1392 | @item --roll-back |
1393 | Roll back to the previous @dfn{generation} of the profile---i.e., undo | |
1394 | the last transaction. | |
1395 | ||
1396 | When combined with options such as @code{--install}, roll back occurs | |
1397 | before any other actions. | |
1398 | ||
d9307267 | 1399 | When rolling back from the first generation that actually contains |
4b2bc804 | 1400 | installed packages, the profile is made to point to the @dfn{zeroth |
f97c9175 | 1401 | generation}, which contains no files apart from its own metadata. |
d9307267 | 1402 | |
f97c9175 AE |
1403 | After having rolled back, installing, removing, or upgrading packages |
1404 | overwrites previous future generations. Thus, the history of the | |
1405 | generations in a profile is always linear. | |
82fe08ed | 1406 | |
b3bb82f1 AK |
1407 | @item --switch-generation=@var{pattern} |
1408 | @itemx -S @var{pattern} | |
1409 | Switch to a particular generation defined by @var{pattern}. | |
1410 | ||
1411 | @var{pattern} may be either a generation number or a number prefixed | |
1412 | with ``+'' or ``-''. The latter means: move forward/backward by a | |
1413 | specified number of generations. For example, if you want to return to | |
1414 | the latest generation after @code{--roll-back}, use | |
1415 | @code{--switch-generation=+1}. | |
1416 | ||
1417 | The difference between @code{--roll-back} and | |
1418 | @code{--switch-generation=-1} is that @code{--switch-generation} will | |
1419 | not make a zeroth generation, so if a specified generation does not | |
1420 | exist, the current generation will not be changed. | |
1421 | ||
dbc31ab2 | 1422 | @item --search-paths[=@var{kind}] |
5924080d LC |
1423 | @cindex search paths |
1424 | Report environment variable definitions, in Bash syntax, that may be | |
1425 | needed in order to use the set of installed packages. These environment | |
1426 | variables are used to specify @dfn{search paths} for files used by some | |
1427 | of the installed packages. | |
1428 | ||
1429 | For example, GCC needs the @code{CPATH} and @code{LIBRARY_PATH} | |
1430 | environment variables to be defined so it can look for headers and | |
1431 | libraries in the user's profile (@pxref{Environment Variables,,, gcc, | |
1432 | Using the GNU Compiler Collection (GCC)}). If GCC and, say, the C | |
1433 | library are installed in the profile, then @code{--search-paths} will | |
1434 | suggest setting these variables to @code{@var{profile}/include} and | |
1435 | @code{@var{profile}/lib}, respectively. | |
1436 | ||
dbc31ab2 LC |
1437 | The typical use case is to define these environment variables in the |
1438 | shell: | |
1439 | ||
1440 | @example | |
1441 | $ eval `guix package --search-paths` | |
1442 | @end example | |
1443 | ||
1444 | @var{kind} may be one of @code{exact}, @code{prefix}, or @code{suffix}, | |
1445 | meaning that the returned environment variable definitions will either | |
1446 | be exact settings, or prefixes or suffixes of the current value of these | |
1447 | variables. When omitted, @var{kind} defaults to @code{exact}. | |
1448 | ||
fc2d2339 LC |
1449 | This option can also be used to compute the @emph{combined} search paths |
1450 | of several profiles. Consider this example: | |
1451 | ||
1452 | @example | |
1453 | $ guix package -p foo -i guile | |
1454 | $ guix package -p bar -i guile-json | |
1455 | $ guix package -p foo -p bar --search-paths | |
1456 | @end example | |
1457 | ||
1458 | The last command above reports about the @code{GUILE_LOAD_PATH} | |
1459 | variable, even though, taken individually, neither @file{foo} nor | |
1460 | @file{bar} would lead to that recommendation. | |
1461 | ||
1462 | ||
eeaf4427 LC |
1463 | @item --profile=@var{profile} |
1464 | @itemx -p @var{profile} | |
1465 | Use @var{profile} instead of the user's default profile. | |
1466 | ||
70915c1a | 1467 | @item --verbose |
f97c9175 AE |
1468 | Produce verbose output. In particular, emit the build log of the |
1469 | environment on the standard error port. | |
70915c1a | 1470 | |
eeaf4427 LC |
1471 | @item --bootstrap |
1472 | Use the bootstrap Guile to build the profile. This option is only | |
1473 | useful to distribution developers. | |
1474 | ||
1475 | @end table | |
1476 | ||
f97c9175 | 1477 | In addition to these actions, @command{guix package} supports the |
733b4130 LC |
1478 | following options to query the current state of a profile, or the |
1479 | availability of packages: | |
eeaf4427 | 1480 | |
733b4130 LC |
1481 | @table @option |
1482 | ||
acc08466 NK |
1483 | @item --search=@var{regexp} |
1484 | @itemx -s @var{regexp} | |
b110869d | 1485 | @cindex searching for packages |
5763ad92 | 1486 | List the available packages whose name, synopsis, or description matches |
f97c9175 | 1487 | @var{regexp}. Print all the metadata of matching packages in |
299112d3 LC |
1488 | @code{recutils} format (@pxref{Top, GNU recutils databases,, recutils, |
1489 | GNU recutils manual}). | |
acc08466 | 1490 | |
299112d3 LC |
1491 | This allows specific fields to be extracted using the @command{recsel} |
1492 | command, for instance: | |
1493 | ||
1494 | @example | |
e49951eb | 1495 | $ guix package -s malloc | recsel -p name,version |
299112d3 LC |
1496 | name: glibc |
1497 | version: 2.17 | |
1498 | ||
1499 | name: libgc | |
1500 | version: 7.2alpha6 | |
1501 | @end example | |
acc08466 | 1502 | |
a12d92f5 LC |
1503 | Similarly, to show the name of all the packages available under the |
1504 | terms of the GNU@tie{}LGPL version 3: | |
1505 | ||
1506 | @example | |
1507 | $ guix package -s "" | recsel -p name -e 'license ~ "LGPL 3"' | |
1508 | name: elfutils | |
1509 | ||
1510 | name: gmp | |
1511 | @dots{} | |
1512 | @end example | |
1513 | ||
db5a9444 LC |
1514 | It is also possible to refine search results using several @code{-s} |
1515 | flags. For example, the following command returns a list of board | |
1516 | games: | |
1517 | ||
1518 | @example | |
1519 | $ guix package -s '\<board\>' -s game | recsel -p name | |
1520 | name: gnubg | |
1521 | @dots{} | |
1522 | @end example | |
1523 | ||
1524 | If we were to omit @code{-s game}, we would also get software packages | |
1525 | that deal with printed circuit boards; removing the angle brackets | |
1526 | around @code{board} would further add packages that have to do with | |
1527 | keyboards. | |
1528 | ||
b110869d LC |
1529 | And now for a more elaborate example. The following command searches |
1530 | for cryptographic libraries, filters out Haskell, Perl, Python, and Ruby | |
1531 | libraries, and prints the name and synopsis of the matching packages: | |
1532 | ||
1533 | @example | |
1534 | $ guix package -s crypto -s library | \ | |
1535 | recsel -e '! (name ~ "^(ghc|perl|python|ruby)")' -p name,synopsis | |
1536 | @end example | |
1537 | ||
1538 | @noindent | |
1539 | @xref{Selection Expressions,,, recutils, GNU recutils manual}, for more | |
1540 | information on @dfn{selection expressions} for @code{recsel -e}. | |
1541 | ||
2aa6efb0 CR |
1542 | @item --show=@var{package} |
1543 | Show details about @var{package}, taken from the list of available packages, in | |
1544 | @code{recutils} format (@pxref{Top, GNU recutils databases,, recutils, GNU | |
1545 | recutils manual}). | |
1546 | ||
1547 | @example | |
1548 | $ guix package --show=python | recsel -p name,version | |
1549 | name: python | |
1550 | version: 2.7.6 | |
1551 | ||
1552 | name: python | |
1553 | version: 3.3.5 | |
1554 | @end example | |
1555 | ||
1556 | You may also specify the full name of a package to only get details about a | |
1557 | specific version of it: | |
1558 | @example | |
1559 | $ guix package --show=python-3.3.5 | recsel -p name,version | |
1560 | name: python | |
1561 | version: 3.3.5 | |
1562 | @end example | |
1563 | ||
1564 | ||
1565 | ||
733b4130 LC |
1566 | @item --list-installed[=@var{regexp}] |
1567 | @itemx -I [@var{regexp}] | |
bd9bde1c LC |
1568 | List the currently installed packages in the specified profile, with the |
1569 | most recently installed packages shown last. When @var{regexp} is | |
1570 | specified, list only installed packages whose name matches @var{regexp}. | |
733b4130 LC |
1571 | |
1572 | For each installed package, print the following items, separated by | |
1573 | tabs: the package name, its version string, the part of the package that | |
1574 | is installed (for instance, @code{out} for the default output, | |
1575 | @code{include} for its headers, etc.), and the path of this package in | |
1576 | the store. | |
1577 | ||
64fc89b6 LC |
1578 | @item --list-available[=@var{regexp}] |
1579 | @itemx -A [@var{regexp}] | |
5763ad92 | 1580 | List packages currently available in the distribution for this system |
a1ba8475 LC |
1581 | (@pxref{GNU Distribution}). When @var{regexp} is specified, list only |
1582 | installed packages whose name matches @var{regexp}. | |
64fc89b6 LC |
1583 | |
1584 | For each package, print the following items separated by tabs: its name, | |
6e721c4d LC |
1585 | its version string, the parts of the package (@pxref{Packages with |
1586 | Multiple Outputs}), and the source location of its definition. | |
64fc89b6 | 1587 | |
f566d765 LC |
1588 | @item --list-generations[=@var{pattern}] |
1589 | @itemx -l [@var{pattern}] | |
1590 | Return a list of generations along with their creation dates; for each | |
1591 | generation, show the installed packages, with the most recently | |
4b2bc804 NK |
1592 | installed packages shown last. Note that the zeroth generation is never |
1593 | shown. | |
f566d765 LC |
1594 | |
1595 | For each installed package, print the following items, separated by | |
1596 | tabs: the name of a package, its version string, the part of the package | |
1597 | that is installed (@pxref{Packages with Multiple Outputs}), and the | |
1598 | location of this package in the store. | |
1599 | ||
1600 | When @var{pattern} is used, the command returns only matching | |
1601 | generations. Valid patterns include: | |
1602 | ||
1603 | @itemize | |
1604 | @item @emph{Integers and comma-separated integers}. Both patterns denote | |
1605 | generation numbers. For instance, @code{--list-generations=1} returns | |
1606 | the first one. | |
1607 | ||
1608 | And @code{--list-generations=1,8,2} outputs three generations in the | |
1609 | specified order. Neither spaces nor trailing commas are allowed. | |
1610 | ||
1611 | @item @emph{Ranges}. @code{--list-generations=2..9} prints the | |
1612 | specified generations and everything in between. Note that the start of | |
f97c9175 | 1613 | a range must be smaller than its end. |
f566d765 LC |
1614 | |
1615 | It is also possible to omit the endpoint. For example, | |
1616 | @code{--list-generations=2..}, returns all generations starting from the | |
1617 | second one. | |
1618 | ||
1619 | @item @emph{Durations}. You can also get the last @emph{N}@tie{}days, weeks, | |
1620 | or months by passing an integer along with the first letter of the | |
d7ddb257 LC |
1621 | duration. For example, @code{--list-generations=20d} lists generations |
1622 | that are up to 20 days old. | |
f566d765 LC |
1623 | @end itemize |
1624 | ||
b7884ca3 NK |
1625 | @item --delete-generations[=@var{pattern}] |
1626 | @itemx -d [@var{pattern}] | |
d7ddb257 LC |
1627 | When @var{pattern} is omitted, delete all generations except the current |
1628 | one. | |
b7884ca3 NK |
1629 | |
1630 | This command accepts the same patterns as @option{--list-generations}. | |
d7ddb257 LC |
1631 | When @var{pattern} is specified, delete the matching generations. When |
1632 | @var{pattern} specifies a duration, generations @emph{older} than the | |
1633 | specified duration match. For instance, @code{--delete-generations=1m} | |
1634 | deletes generations that are more than one month old. | |
1635 | ||
391bdd8f LC |
1636 | If the current generation matches, it is @emph{not} deleted. Also, the |
1637 | zeroth generation is never deleted. | |
b7884ca3 | 1638 | |
f97c9175 | 1639 | Note that deleting generations prevents rolling back to them. |
1bb9900a LC |
1640 | Consequently, this command must be used with care. |
1641 | ||
733b4130 | 1642 | @end table |
eeaf4427 | 1643 | |
70ee5642 | 1644 | Finally, since @command{guix package} may actually start build |
ccd7158d | 1645 | processes, it supports all the common build options (@pxref{Common Build |
f97c9175 | 1646 | Options}). It also supports package transformation options, such as |
b8638f03 LC |
1647 | @option{--with-source} (@pxref{Package Transformation Options}). |
1648 | However, note that package transformations are lost when upgrading; to | |
f97c9175 | 1649 | preserve transformations across upgrades, you should define your own |
b8638f03 LC |
1650 | package variant in a Guile module and add it to @code{GUIX_PACKAGE_PATH} |
1651 | (@pxref{Defining Packages}). | |
1652 | ||
70ee5642 | 1653 | |
c4202d60 LC |
1654 | @node Substitutes |
1655 | @section Substitutes | |
1656 | ||
1657 | @cindex substitutes | |
1658 | @cindex pre-built binaries | |
1659 | Guix supports transparent source/binary deployment, which means that it | |
1660 | can either build things locally, or download pre-built items from a | |
1661 | server. We call these pre-built items @dfn{substitutes}---they are | |
1662 | substitutes for local build results. In many cases, downloading a | |
1663 | substitute is much faster than building things locally. | |
1664 | ||
1665 | Substitutes can be anything resulting from a derivation build | |
1666 | (@pxref{Derivations}). Of course, in the common case, they are | |
1667 | pre-built package binaries, but source tarballs, for instance, which | |
1668 | also result from derivation builds, can be available as substitutes. | |
1669 | ||
1670 | The @code{hydra.gnu.org} server is a front-end to a build farm that | |
1671 | builds packages from the GNU distribution continuously for some | |
32950fc8 AK |
1672 | architectures, and makes them available as substitutes (@pxref{Emacs |
1673 | Hydra}, for information on how to query the continuous integration | |
1674 | server). This is the | |
f8a8e0fe LC |
1675 | default source of substitutes; it can be overridden by passing the |
1676 | @option{--substitute-urls} option either to @command{guix-daemon} | |
1677 | (@pxref{daemon-substitute-urls,, @code{guix-daemon --substitute-urls}}) | |
1678 | or to client tools such as @command{guix package} | |
1679 | (@pxref{client-substitute-urls,, client @option{--substitute-urls} | |
1680 | option}). | |
c4202d60 LC |
1681 | |
1682 | @cindex security | |
1683 | @cindex digital signatures | |
1684 | To allow Guix to download substitutes from @code{hydra.gnu.org}, you | |
1685 | must add its public key to the access control list (ACL) of archive | |
1686 | imports, using the @command{guix archive} command (@pxref{Invoking guix | |
1687 | archive}). Doing so implies that you trust @code{hydra.gnu.org} to not | |
1688 | be compromised and to serve genuine substitutes. | |
1689 | ||
1690 | This public key is installed along with Guix, in | |
1691 | @code{@var{prefix}/share/guix/hydra.gnu.org.pub}, where @var{prefix} is | |
1692 | the installation prefix of Guix. If you installed Guix from source, | |
1693 | make sure you checked the GPG signature of | |
1694 | @file{guix-@value{VERSION}.tar.gz}, which contains this public key file. | |
1695 | Then, you can run something like this: | |
1696 | ||
1697 | @example | |
1698 | # guix archive --authorize < hydra.gnu.org.pub | |
1699 | @end example | |
1700 | ||
1701 | Once this is in place, the output of a command like @code{guix build} | |
1702 | should change from something like: | |
1703 | ||
1704 | @example | |
1705 | $ guix build emacs --dry-run | |
1706 | The following derivations would be built: | |
1707 | /gnu/store/yr7bnx8xwcayd6j95r2clmkdl1qh688w-emacs-24.3.drv | |
1708 | /gnu/store/x8qsh1hlhgjx6cwsjyvybnfv2i37z23w-dbus-1.6.4.tar.gz.drv | |
1709 | /gnu/store/1ixwp12fl950d15h2cj11c73733jay0z-alsa-lib-1.0.27.1.tar.bz2.drv | |
1710 | /gnu/store/nlma1pw0p603fpfiqy7kn4zm105r5dmw-util-linux-2.21.drv | |
1711 | @dots{} | |
1712 | @end example | |
1713 | ||
1714 | @noindent | |
1715 | to something like: | |
1716 | ||
1717 | @example | |
1718 | $ guix build emacs --dry-run | |
1719 | The following files would be downloaded: | |
1720 | /gnu/store/pk3n22lbq6ydamyymqkkz7i69wiwjiwi-emacs-24.3 | |
1721 | /gnu/store/2ygn4ncnhrpr61rssa6z0d9x22si0va3-libjpeg-8d | |
1722 | /gnu/store/71yz6lgx4dazma9dwn2mcjxaah9w77jq-cairo-1.12.16 | |
1723 | /gnu/store/7zdhgp0n1518lvfn8mb96sxqfmvqrl7v-libxrender-0.9.7 | |
1724 | @dots{} | |
1725 | @end example | |
1726 | ||
1727 | @noindent | |
1728 | This indicates that substitutes from @code{hydra.gnu.org} are usable and | |
1729 | will be downloaded, when possible, for future builds. | |
1730 | ||
1731 | Guix ignores substitutes that are not signed, or that are not signed by | |
ef27aa9c | 1732 | one of the keys listed in the ACL. It also detects and raises an error |
c4202d60 LC |
1733 | when attempting to use a substitute that has been tampered with. |
1734 | ||
e0c941fe LC |
1735 | @vindex http_proxy |
1736 | Substitutes are downloaded over HTTP. The @code{http_proxy} environment | |
1737 | variable can be set in the environment of @command{guix-daemon} and is | |
1738 | honored for downloads of substitutes. Note that the value of | |
1739 | @code{http_proxy} in the environment where @command{guix build}, | |
1740 | @command{guix package}, and other client commands are run has | |
1741 | @emph{absolutely no effect}. | |
1742 | ||
c4202d60 LC |
1743 | The substitute mechanism can be disabled globally by running |
1744 | @code{guix-daemon} with @code{--no-substitutes} (@pxref{Invoking | |
1745 | guix-daemon}). It can also be disabled temporarily by passing the | |
1746 | @code{--no-substitutes} option to @command{guix package}, @command{guix | |
1747 | build}, and other command-line tools. | |
1748 | ||
1749 | ||
1750 | Today, each individual's control over their own computing is at the | |
1751 | mercy of institutions, corporations, and groups with enough power and | |
1752 | determination to subvert the computing infrastructure and exploit its | |
1753 | weaknesses. While using @code{hydra.gnu.org} substitutes can be | |
1754 | convenient, we encourage users to also build on their own, or even run | |
1755 | their own build farm, such that @code{hydra.gnu.org} is less of an | |
8ce229fc LC |
1756 | interesting target. One way to help is by publishing the software you |
1757 | build using @command{guix publish} so that others have one more choice | |
1758 | of server to download substitutes from (@pxref{Invoking guix publish}). | |
c4202d60 LC |
1759 | |
1760 | Guix has the foundations to maximize build reproducibility | |
1761 | (@pxref{Features}). In most cases, independent builds of a given | |
1762 | package or derivation should yield bit-identical results. Thus, through | |
1763 | a diverse set of independent package builds, we can strengthen the | |
d23c20f1 LC |
1764 | integrity of our systems. The @command{guix challenge} command aims to |
1765 | help users assess substitute servers, and to assist developers in | |
1766 | finding out about non-deterministic package builds (@pxref{Invoking guix | |
a8d65643 LC |
1767 | challenge}). Similarly, the @option{--check} option of @command{guix |
1768 | build} allows users to check whether previously-installed substitutes | |
1769 | are genuine by rebuilding them locally (@pxref{build-check, | |
1770 | @command{guix build --check}}). | |
c4202d60 LC |
1771 | |
1772 | In the future, we want Guix to have support to publish and retrieve | |
1773 | binaries to/from other users, in a peer-to-peer fashion. If you would | |
1774 | like to discuss this project, join us on @email{guix-devel@@gnu.org}. | |
1775 | ||
1776 | ||
6e721c4d LC |
1777 | @node Packages with Multiple Outputs |
1778 | @section Packages with Multiple Outputs | |
1779 | ||
1780 | @cindex multiple-output packages | |
1781 | @cindex package outputs | |
1782 | ||
1783 | Often, packages defined in Guix have a single @dfn{output}---i.e., the | |
f97c9175 | 1784 | source package leads to exactly one directory in the store. When running |
6e721c4d LC |
1785 | @command{guix package -i glibc}, one installs the default output of the |
1786 | GNU libc package; the default output is called @code{out}, but its name | |
1787 | can be omitted as shown in this command. In this particular case, the | |
1788 | default output of @code{glibc} contains all the C header files, shared | |
1789 | libraries, static libraries, Info documentation, and other supporting | |
1790 | files. | |
1791 | ||
1792 | Sometimes it is more appropriate to separate the various types of files | |
1793 | produced from a single source package into separate outputs. For | |
1794 | instance, the GLib C library (used by GTK+ and related packages) | |
1795 | installs more than 20 MiB of reference documentation as HTML pages. | |
1796 | To save space for users who do not need it, the documentation goes to a | |
1797 | separate output, called @code{doc}. To install the main GLib output, | |
1798 | which contains everything but the documentation, one would run: | |
1799 | ||
1800 | @example | |
1801 | guix package -i glib | |
1802 | @end example | |
1803 | ||
1804 | The command to install its documentation is: | |
1805 | ||
1806 | @example | |
1807 | guix package -i glib:doc | |
1808 | @end example | |
1809 | ||
1810 | Some packages install programs with different ``dependency footprints''. | |
f97c9175 | 1811 | For instance, the WordNet package installs both command-line tools and |
6e721c4d LC |
1812 | graphical user interfaces (GUIs). The former depend solely on the C |
1813 | library, whereas the latter depend on Tcl/Tk and the underlying X | |
1814 | libraries. In this case, we leave the command-line tools in the default | |
1815 | output, whereas the GUIs are in a separate output. This allows users | |
fcc58db6 LC |
1816 | who do not need the GUIs to save space. The @command{guix size} command |
1817 | can help find out about such situations (@pxref{Invoking guix size}). | |
88856916 | 1818 | @command{guix graph} can also be helpful (@pxref{Invoking guix graph}). |
6e721c4d LC |
1819 | |
1820 | There are several such multiple-output packages in the GNU distribution. | |
91ef73d4 LC |
1821 | Other conventional output names include @code{lib} for libraries and |
1822 | possibly header files, @code{bin} for stand-alone programs, and | |
1823 | @code{debug} for debugging information (@pxref{Installing Debugging | |
1824 | Files}). The outputs of a packages are listed in the third column of | |
1825 | the output of @command{guix package --list-available} (@pxref{Invoking | |
1826 | guix package}). | |
6e721c4d | 1827 | |
eeaf4427 | 1828 | |
e49951eb MW |
1829 | @node Invoking guix gc |
1830 | @section Invoking @command{guix gc} | |
fe8ff028 LC |
1831 | |
1832 | @cindex garbage collector | |
f97c9175 | 1833 | Packages that are installed, but not used, may be @dfn{garbage-collected}. |
e49951eb | 1834 | The @command{guix gc} command allows users to explicitly run the garbage |
c22eb992 LC |
1835 | collector to reclaim space from the @file{/gnu/store} directory. It is |
1836 | the @emph{only} way to remove files from @file{/gnu/store}---removing | |
1837 | files or directories manually may break it beyond repair! | |
fe8ff028 LC |
1838 | |
1839 | The garbage collector has a set of known @dfn{roots}: any file under | |
834129e0 | 1840 | @file{/gnu/store} reachable from a root is considered @dfn{live} and |
fe8ff028 LC |
1841 | cannot be deleted; any other file is considered @dfn{dead} and may be |
1842 | deleted. The set of garbage collector roots includes default user | |
e49951eb MW |
1843 | profiles, and may be augmented with @command{guix build --root}, for |
1844 | example (@pxref{Invoking guix build}). | |
fe8ff028 | 1845 | |
1bb9900a LC |
1846 | Prior to running @code{guix gc --collect-garbage} to make space, it is |
1847 | often useful to remove old generations from user profiles; that way, old | |
1848 | package builds referenced by those generations can be reclaimed. This | |
1849 | is achieved by running @code{guix package --delete-generations} | |
1850 | (@pxref{Invoking guix package}). | |
1851 | ||
e49951eb | 1852 | The @command{guix gc} command has three modes of operation: it can be |
fe8ff028 | 1853 | used to garbage-collect any dead files (the default), to delete specific |
7770aafc LC |
1854 | files (the @code{--delete} option), to print garbage-collector |
1855 | information, or for more advanced queries. The garbage collection | |
1856 | options are as follows: | |
fe8ff028 LC |
1857 | |
1858 | @table @code | |
1859 | @item --collect-garbage[=@var{min}] | |
1860 | @itemx -C [@var{min}] | |
834129e0 | 1861 | Collect garbage---i.e., unreachable @file{/gnu/store} files and |
fe8ff028 LC |
1862 | sub-directories. This is the default operation when no option is |
1863 | specified. | |
1864 | ||
1865 | When @var{min} is given, stop once @var{min} bytes have been collected. | |
1866 | @var{min} may be a number of bytes, or it may include a unit as a | |
4a44d7bb LC |
1867 | suffix, such as @code{MiB} for mebibytes and @code{GB} for gigabytes |
1868 | (@pxref{Block size, size specifications,, coreutils, GNU Coreutils}). | |
fe8ff028 LC |
1869 | |
1870 | When @var{min} is omitted, collect all the garbage. | |
1871 | ||
1872 | @item --delete | |
1873 | @itemx -d | |
1874 | Attempt to delete all the store files and directories specified as | |
1875 | arguments. This fails if some of the files are not in the store, or if | |
1876 | they are still live. | |
1877 | ||
30d9aa54 LC |
1878 | @item --list-failures |
1879 | List store items corresponding to cached build failures. | |
1880 | ||
1881 | This prints nothing unless the daemon was started with | |
1882 | @option{--cache-failures} (@pxref{Invoking guix-daemon, | |
1883 | @option{--cache-failures}}). | |
1884 | ||
1885 | @item --clear-failures | |
1886 | Remove the specified store items from the failed-build cache. | |
1887 | ||
1888 | Again, this option only makes sense when the daemon is started with | |
1889 | @option{--cache-failures}. Otherwise, it does nothing. | |
1890 | ||
fe8ff028 LC |
1891 | @item --list-dead |
1892 | Show the list of dead files and directories still present in the | |
1893 | store---i.e., files and directories no longer reachable from any root. | |
1894 | ||
1895 | @item --list-live | |
1896 | Show the list of live store files and directories. | |
ba8b732d LC |
1897 | |
1898 | @end table | |
1899 | ||
1900 | In addition, the references among existing store files can be queried: | |
1901 | ||
1902 | @table @code | |
1903 | ||
1904 | @item --references | |
1905 | @itemx --referrers | |
1906 | List the references (respectively, the referrers) of store files given | |
1907 | as arguments. | |
1908 | ||
8e59fdd5 LC |
1909 | @item --requisites |
1910 | @itemx -R | |
fcc58db6 | 1911 | @cindex closure |
8e59fdd5 LC |
1912 | List the requisites of the store files passed as arguments. Requisites |
1913 | include the store files themselves, their references, and the references | |
1914 | of these, recursively. In other words, the returned list is the | |
1915 | @dfn{transitive closure} of the store files. | |
1916 | ||
f97c9175 AE |
1917 | @xref{Invoking guix size}, for a tool to profile the size of the closure |
1918 | of an element. @xref{Invoking guix graph}, for a tool to visualize | |
88856916 | 1919 | the graph of references. |
fcc58db6 | 1920 | |
fe8ff028 LC |
1921 | @end table |
1922 | ||
7770aafc LC |
1923 | Lastly, the following options allow you to check the integrity of the |
1924 | store and to control disk usage. | |
1925 | ||
1926 | @table @option | |
1927 | ||
1928 | @item --verify[=@var{options}] | |
1929 | @cindex integrity, of the store | |
1930 | @cindex integrity checking | |
1931 | Verify the integrity of the store. | |
1932 | ||
1933 | By default, make sure that all the store items marked as valid in the | |
f97c9175 | 1934 | database of the daemon actually exist in @file{/gnu/store}. |
7770aafc | 1935 | |
f97c9175 | 1936 | When provided, @var{options} must be a comma-separated list containing one |
7770aafc LC |
1937 | or more of @code{contents} and @code{repair}. |
1938 | ||
f97c9175 AE |
1939 | When passing @option{--verify=contents}, the daemon computse the |
1940 | content hash of each store item and compares it against its hash in the | |
7770aafc LC |
1941 | database. Hash mismatches are reported as data corruptions. Because it |
1942 | traverses @emph{all the files in the store}, this command can take a | |
1943 | long time, especially on systems with a slow disk drive. | |
1944 | ||
1945 | @cindex repairing the store | |
1946 | Using @option{--verify=repair} or @option{--verify=contents,repair} | |
1947 | causes the daemon to try to repair corrupt store items by fetching | |
1948 | substitutes for them (@pxref{Substitutes}). Because repairing is not | |
1949 | atomic, and thus potentially dangerous, it is available only to the | |
1950 | system administrator. | |
1951 | ||
1952 | @item --optimize | |
1953 | @cindex deduplication | |
1954 | Optimize the store by hard-linking identical files---this is | |
1955 | @dfn{deduplication}. | |
1956 | ||
1957 | The daemon performs deduplication after each successful build or archive | |
1958 | import, unless it was started with @code{--disable-deduplication} | |
1959 | (@pxref{Invoking guix-daemon, @code{--disable-deduplication}}). Thus, | |
1960 | this option is primarily useful when the daemon was running with | |
1961 | @code{--disable-deduplication}. | |
1962 | ||
1963 | @end table | |
eeaf4427 | 1964 | |
f651b477 LC |
1965 | @node Invoking guix pull |
1966 | @section Invoking @command{guix pull} | |
1967 | ||
1968 | Packages are installed or upgraded to the latest version available in | |
1969 | the distribution currently available on your local machine. To update | |
1970 | that distribution, along with the Guix tools, you must run @command{guix | |
1971 | pull}: the command downloads the latest Guix source code and package | |
1972 | descriptions, and deploys it. | |
1973 | ||
1974 | On completion, @command{guix package} will use packages and package | |
1975 | versions from this just-retrieved copy of Guix. Not only that, but all | |
1976 | the Guix commands and Scheme modules will also be taken from that latest | |
1977 | version. New @command{guix} sub-commands added by the update also | |
ef54b61d AV |
1978 | become available@footnote{Under the hood, @command{guix pull} updates |
1979 | the @file{~/.config/guix/latest} symbolic link to point to the latest | |
1980 | Guix, and the @command{guix} command loads code from there.}. | |
f651b477 LC |
1981 | |
1982 | The @command{guix pull} command is usually invoked with no arguments, | |
1983 | but it supports the following options: | |
1984 | ||
1985 | @table @code | |
1986 | @item --verbose | |
1987 | Produce verbose output, writing build logs to the standard error output. | |
1988 | ||
ab5d72ad LC |
1989 | @item --url=@var{url} |
1990 | Download the source tarball of Guix from @var{url}. | |
1991 | ||
1992 | By default, the tarball is taken from its canonical address at | |
1993 | @code{gnu.org}, for the stable branch of Guix. | |
1994 | ||
f651b477 LC |
1995 | @item --bootstrap |
1996 | Use the bootstrap Guile to build the latest Guix. This option is only | |
1997 | useful to Guix developers. | |
1998 | @end table | |
1999 | ||
760c60d6 LC |
2000 | |
2001 | @node Invoking guix archive | |
2002 | @section Invoking @command{guix archive} | |
2003 | ||
2004 | The @command{guix archive} command allows users to @dfn{export} files | |
2005 | from the store into a single archive, and to later @dfn{import} them. | |
2006 | In particular, it allows store files to be transferred from one machine | |
4d4c4816 AE |
2007 | to the store on another machine. |
2008 | ||
2009 | To export store files as an archive to standard output, run: | |
2010 | ||
2011 | @example | |
2012 | guix archive --export @var{options} @var{specifications}... | |
2013 | @end example | |
2014 | ||
2015 | @var{specifications} may be either store file names or package | |
2016 | specifications, as for @command{guix package} (@pxref{Invoking guix | |
2017 | package}). For instance, the following command creates an archive | |
2018 | containing the @code{gui} output of the @code{git} package and the main | |
2019 | output of @code{emacs}: | |
2020 | ||
2021 | @example | |
2022 | guix archive --export git:gui /gnu/store/...-emacs-24.3 > great.nar | |
2023 | @end example | |
2024 | ||
2025 | If the specified packages are not built yet, @command{guix archive} | |
2026 | automatically builds them. The build process may be controlled with the | |
2027 | common build options (@pxref{Common Build Options}). | |
2028 | ||
2029 | To transfer the @code{emacs} package to a machine connected over SSH, | |
2030 | one would run: | |
760c60d6 LC |
2031 | |
2032 | @example | |
56607088 | 2033 | guix archive --export -r emacs | ssh the-machine guix archive --import |
760c60d6 LC |
2034 | @end example |
2035 | ||
87236aed | 2036 | @noindent |
56607088 LC |
2037 | Similarly, a complete user profile may be transferred from one machine |
2038 | to another like this: | |
2039 | ||
2040 | @example | |
2041 | guix archive --export -r $(readlink -f ~/.guix-profile) | \ | |
2042 | ssh the-machine guix-archive --import | |
2043 | @end example | |
2044 | ||
2045 | @noindent | |
2046 | However, note that, in both examples, all of @code{emacs} and the | |
2047 | profile as well as all of their dependencies are transferred (due to | |
f97c9175 AE |
2048 | @code{-r}), regardless of what is already available in the store on the |
2049 | target machine. The @code{--missing} option can help figure out which | |
2050 | items are missing from the target store. | |
87236aed | 2051 | |
760c60d6 | 2052 | Archives are stored in the ``Nix archive'' or ``Nar'' format, which is |
0dbd88db LC |
2053 | comparable in spirit to `tar', but with a few noteworthy differences |
2054 | that make it more appropriate for our purposes. First, rather than | |
f97c9175 | 2055 | recording all Unix metadata for each file, the Nar format only mentions |
0dbd88db LC |
2056 | the file type (regular, directory, or symbolic link); Unix permissions |
2057 | and owner/group are dismissed. Second, the order in which directory | |
2058 | entries are stored always follows the order of file names according to | |
2059 | the C locale collation order. This makes archive production fully | |
2060 | deterministic. | |
2061 | ||
2062 | When exporting, the daemon digitally signs the contents of the archive, | |
2063 | and that digital signature is appended. When importing, the daemon | |
2064 | verifies the signature and rejects the import in case of an invalid | |
2065 | signature or if the signing key is not authorized. | |
760c60d6 LC |
2066 | @c FIXME: Add xref to daemon doc about signatures. |
2067 | ||
2068 | The main options are: | |
2069 | ||
2070 | @table @code | |
2071 | @item --export | |
2072 | Export the specified store files or packages (see below.) Write the | |
2073 | resulting archive to the standard output. | |
2074 | ||
56607088 LC |
2075 | Dependencies are @emph{not} included in the output, unless |
2076 | @code{--recursive} is passed. | |
2077 | ||
2078 | @item -r | |
2079 | @itemx --recursive | |
2080 | When combined with @code{--export}, this instructs @command{guix | |
2081 | archive} to include dependencies of the given items in the archive. | |
2082 | Thus, the resulting archive is self-contained: it contains the closure | |
2083 | of the exported store items. | |
2084 | ||
760c60d6 LC |
2085 | @item --import |
2086 | Read an archive from the standard input, and import the files listed | |
2087 | therein into the store. Abort if the archive has an invalid digital | |
f82cc5fd LC |
2088 | signature, or if it is signed by a public key not among the authorized |
2089 | keys (see @code{--authorize} below.) | |
554f26ec | 2090 | |
87236aed LC |
2091 | @item --missing |
2092 | Read a list of store file names from the standard input, one per line, | |
2093 | and write on the standard output the subset of these files missing from | |
2094 | the store. | |
2095 | ||
554f26ec | 2096 | @item --generate-key[=@var{parameters}] |
f82cc5fd | 2097 | @cindex signing, archives |
f97c9175 | 2098 | Generate a new key pair for the daemon. This is a prerequisite before |
554f26ec LC |
2099 | archives can be exported with @code{--export}. Note that this operation |
2100 | usually takes time, because it needs to gather enough entropy to | |
2101 | generate the key pair. | |
2102 | ||
2103 | The generated key pair is typically stored under @file{/etc/guix}, in | |
2104 | @file{signing-key.pub} (public key) and @file{signing-key.sec} (private | |
867d8473 LC |
2105 | key, which must be kept secret.) When @var{parameters} is omitted, |
2106 | an ECDSA key using the Ed25519 curve is generated, or, for Libgcrypt | |
2107 | versions before 1.6.0, it is a 4096-bit RSA key. | |
f97c9175 | 2108 | Alternatively, @var{parameters} can specify |
554f26ec LC |
2109 | @code{genkey} parameters suitable for Libgcrypt (@pxref{General |
2110 | public-key related Functions, @code{gcry_pk_genkey},, gcrypt, The | |
2111 | Libgcrypt Reference Manual}). | |
f82cc5fd LC |
2112 | |
2113 | @item --authorize | |
2114 | @cindex authorizing, archives | |
2115 | Authorize imports signed by the public key passed on standard input. | |
2116 | The public key must be in ``s-expression advanced format''---i.e., the | |
2117 | same format as the @file{signing-key.pub} file. | |
2118 | ||
2119 | The list of authorized keys is kept in the human-editable file | |
2120 | @file{/etc/guix/acl}. The file contains | |
2121 | @url{http://people.csail.mit.edu/rivest/Sexp.txt, ``advanced-format | |
2122 | s-expressions''} and is structured as an access-control list in the | |
2123 | @url{http://theworld.com/~cme/spki.txt, Simple Public-Key Infrastructure | |
2124 | (SPKI)}. | |
c6f8e9dd LC |
2125 | |
2126 | @item --extract=@var{directory} | |
2127 | @itemx -x @var{directory} | |
2128 | Read a single-item archive as served by substitute servers | |
2129 | (@pxref{Substitutes}) and extract it to @var{directory}. This is a | |
2130 | low-level operation needed in only very narrow use cases; see below. | |
2131 | ||
2132 | For example, the following command extracts the substitute for Emacs | |
2133 | served by @code{hydra.gnu.org} to @file{/tmp/emacs}: | |
2134 | ||
2135 | @example | |
2136 | $ wget -O - \ | |
2137 | http://hydra.gnu.org/nar/@dots{}-emacs-24.5 \ | |
2138 | | bunzip2 | guix archive -x /tmp/emacs | |
2139 | @end example | |
2140 | ||
2141 | Single-item archives are different from multiple-item archives produced | |
2142 | by @command{guix archive --export}; they contain a single store item, | |
2143 | and they do @emph{not} embed a signature. Thus this operation does | |
2144 | @emph{no} signature verification and its output should be considered | |
2145 | unsafe. | |
2146 | ||
2147 | The primary purpose of this operation is to facilitate inspection of | |
2148 | archive contents coming from possibly untrusted substitute servers. | |
2149 | ||
760c60d6 LC |
2150 | @end table |
2151 | ||
c554de89 AK |
2152 | @c ********************************************************************* |
2153 | @include emacs.texi | |
760c60d6 | 2154 | |
568717fd LC |
2155 | @c ********************************************************************* |
2156 | @node Programming Interface | |
2157 | @chapter Programming Interface | |
2158 | ||
3dc1970d LC |
2159 | GNU Guix provides several Scheme programming interfaces (APIs) to |
2160 | define, build, and query packages. The first interface allows users to | |
2161 | write high-level package definitions. These definitions refer to | |
2162 | familiar packaging concepts, such as the name and version of a package, | |
2163 | its build system, and its dependencies. These definitions can then be | |
2164 | turned into concrete build actions. | |
2165 | ||
ba55b1cb | 2166 | Build actions are performed by the Guix daemon, on behalf of users. In a |
3dc1970d | 2167 | standard setup, the daemon has write access to the store---the |
834129e0 | 2168 | @file{/gnu/store} directory---whereas users do not. The recommended |
3dc1970d LC |
2169 | setup also has the daemon perform builds in chroots, under a specific |
2170 | build users, to minimize interference with the rest of the system. | |
2171 | ||
2172 | @cindex derivation | |
2173 | Lower-level APIs are available to interact with the daemon and the | |
2174 | store. To instruct the daemon to perform a build action, users actually | |
2175 | provide it with a @dfn{derivation}. A derivation is a low-level | |
2176 | representation of the build actions to be taken, and the environment in | |
2177 | which they should occur---derivations are to package definitions what | |
49ad317a LC |
2178 | assembly is to C programs. The term ``derivation'' comes from the fact |
2179 | that build results @emph{derive} from them. | |
3dc1970d LC |
2180 | |
2181 | This chapter describes all these APIs in turn, starting from high-level | |
2182 | package definitions. | |
2183 | ||
568717fd | 2184 | @menu |
b860f382 | 2185 | * Defining Packages:: Defining new packages. |
7458bd0a | 2186 | * Build Systems:: Specifying how packages are built. |
b860f382 LC |
2187 | * The Store:: Manipulating the package store. |
2188 | * Derivations:: Low-level interface to package derivations. | |
2189 | * The Store Monad:: Purely functional interface to the store. | |
21b679f6 | 2190 | * G-Expressions:: Manipulating build expressions. |
568717fd LC |
2191 | @end menu |
2192 | ||
2193 | @node Defining Packages | |
2194 | @section Defining Packages | |
2195 | ||
3dc1970d LC |
2196 | The high-level interface to package definitions is implemented in the |
2197 | @code{(guix packages)} and @code{(guix build-system)} modules. As an | |
2198 | example, the package definition, or @dfn{recipe}, for the GNU Hello | |
2199 | package looks like this: | |
2200 | ||
2201 | @example | |
e7f34eb0 LC |
2202 | (define-module (gnu packages hello) |
2203 | #:use-module (guix packages) | |
2204 | #:use-module (guix download) | |
2205 | #:use-module (guix build-system gnu) | |
a6dcdcac SB |
2206 | #:use-module (guix licenses) |
2207 | #:use-module (gnu packages gawk)) | |
b22a12fd | 2208 | |
79f5dd59 | 2209 | (define-public hello |
3dc1970d LC |
2210 | (package |
2211 | (name "hello") | |
17d8e33f | 2212 | (version "2.10") |
3dc1970d | 2213 | (source (origin |
17d8e33f ML |
2214 | (method url-fetch) |
2215 | (uri (string-append "mirror://gnu/hello/hello-" version | |
2216 | ".tar.gz")) | |
2217 | (sha256 | |
2218 | (base32 | |
2219 | "0ssi1wpaf7plaswqqjwigppsg5fyh99vdlb9kzl7c9lng89ndq1i")))) | |
3dc1970d | 2220 | (build-system gnu-build-system) |
7458bd0a | 2221 | (arguments `(#:configure-flags '("--enable-silent-rules"))) |
3dc1970d | 2222 | (inputs `(("gawk" ,gawk))) |
7458bd0a LC |
2223 | (synopsis "Hello, GNU world: An example GNU package") |
2224 | (description "Guess what GNU Hello prints!") | |
3dc1970d | 2225 | (home-page "http://www.gnu.org/software/hello/") |
b22a12fd | 2226 | (license gpl3+))) |
3dc1970d LC |
2227 | @end example |
2228 | ||
2229 | @noindent | |
2230 | Without being a Scheme expert, the reader may have guessed the meaning | |
f97c9175 AE |
2231 | of the various fields here. This expression binds the variable |
2232 | @code{hello} to a @code{<package>} object, which is essentially a record | |
3dc1970d LC |
2233 | (@pxref{SRFI-9, Scheme records,, guile, GNU Guile Reference Manual}). |
2234 | This package object can be inspected using procedures found in the | |
2235 | @code{(guix packages)} module; for instance, @code{(package-name hello)} | |
2236 | returns---surprise!---@code{"hello"}. | |
2237 | ||
2f7d2d91 LC |
2238 | With luck, you may be able to import part or all of the definition of |
2239 | the package you are interested in from another repository, using the | |
2240 | @code{guix import} command (@pxref{Invoking guix import}). | |
2241 | ||
f97c9175 | 2242 | In the example above, @var{hello} is defined in a module of its own, |
e7f34eb0 LC |
2243 | @code{(gnu packages hello)}. Technically, this is not strictly |
2244 | necessary, but it is convenient to do so: all the packages defined in | |
2245 | modules under @code{(gnu packages @dots{})} are automatically known to | |
2246 | the command-line tools (@pxref{Package Modules}). | |
2247 | ||
3dc1970d LC |
2248 | There are a few points worth noting in the above package definition: |
2249 | ||
2250 | @itemize | |
2251 | @item | |
a2bf4907 LC |
2252 | The @code{source} field of the package is an @code{<origin>} object |
2253 | (@pxref{origin Reference}, for the complete reference). | |
3dc1970d LC |
2254 | Here, the @code{url-fetch} method from @code{(guix download)} is used, |
2255 | meaning that the source is a file to be downloaded over FTP or HTTP. | |
2256 | ||
2257 | The @code{mirror://gnu} prefix instructs @code{url-fetch} to use one of | |
2258 | the GNU mirrors defined in @code{(guix download)}. | |
2259 | ||
2260 | The @code{sha256} field specifies the expected SHA256 hash of the file | |
2261 | being downloaded. It is mandatory, and allows Guix to check the | |
2262 | integrity of the file. The @code{(base32 @dots{})} form introduces the | |
6c365eca | 2263 | base32 representation of the hash. You can obtain this information with |
210cc920 LC |
2264 | @code{guix download} (@pxref{Invoking guix download}) and @code{guix |
2265 | hash} (@pxref{Invoking guix hash}). | |
3dc1970d | 2266 | |
f9cc8971 LC |
2267 | @cindex patches |
2268 | When needed, the @code{origin} form can also have a @code{patches} field | |
2269 | listing patches to be applied, and a @code{snippet} field giving a | |
2270 | Scheme expression to modify the source code. | |
2271 | ||
3dc1970d LC |
2272 | @item |
2273 | @cindex GNU Build System | |
7458bd0a LC |
2274 | The @code{build-system} field specifies the procedure to build the |
2275 | package (@pxref{Build Systems}). Here, @var{gnu-build-system} | |
2276 | represents the familiar GNU Build System, where packages may be | |
2277 | configured, built, and installed with the usual @code{./configure && | |
2278 | make && make check && make install} command sequence. | |
2279 | ||
2280 | @item | |
2281 | The @code{arguments} field specifies options for the build system | |
2282 | (@pxref{Build Systems}). Here it is interpreted by | |
2283 | @var{gnu-build-system} as a request run @file{configure} with the | |
2284 | @code{--enable-silent-rules} flag. | |
3dc1970d LC |
2285 | |
2286 | @item | |
2287 | The @code{inputs} field specifies inputs to the build process---i.e., | |
2288 | build-time or run-time dependencies of the package. Here, we define an | |
2289 | input called @code{"gawk"} whose value is that of the @var{gawk} | |
2290 | variable; @var{gawk} is itself bound to a @code{<package>} object. | |
2291 | ||
2292 | Note that GCC, Coreutils, Bash, and other essential tools do not need to | |
2293 | be specified as inputs here. Instead, @var{gnu-build-system} takes care | |
7458bd0a | 2294 | of ensuring that they are present (@pxref{Build Systems}). |
3dc1970d LC |
2295 | |
2296 | However, any other dependencies need to be specified in the | |
2297 | @code{inputs} field. Any dependency not specified here will simply be | |
2298 | unavailable to the build process, possibly leading to a build failure. | |
2299 | @end itemize | |
2300 | ||
87eafdbd TUBK |
2301 | @xref{package Reference}, for a full description of possible fields. |
2302 | ||
2f7d2d91 | 2303 | Once a package definition is in place, the |
e49951eb | 2304 | package may actually be built using the @code{guix build} command-line |
39bee8a2 LC |
2305 | tool (@pxref{Invoking guix build}). You can easily jump back to the |
2306 | package definition using the @command{guix edit} command | |
2307 | (@pxref{Invoking guix edit}). | |
2308 | @xref{Packaging Guidelines}, for | |
b4f5e0e8 CR |
2309 | more information on how to test package definitions, and |
2310 | @ref{Invoking guix lint}, for information on how to check a definition | |
2311 | for style conformance. | |
2312 | ||
f97c9175 | 2313 | Finally, updating the package definition to a new upstream version |
7458bd0a LC |
2314 | can be partly automated by the @command{guix refresh} command |
2315 | (@pxref{Invoking guix refresh}). | |
3dc1970d LC |
2316 | |
2317 | Behind the scenes, a derivation corresponding to the @code{<package>} | |
2318 | object is first computed by the @code{package-derivation} procedure. | |
834129e0 | 2319 | That derivation is stored in a @code{.drv} file under @file{/gnu/store}. |
ba55b1cb | 2320 | The build actions it prescribes may then be realized by using the |
3dc1970d LC |
2321 | @code{build-derivations} procedure (@pxref{The Store}). |
2322 | ||
2323 | @deffn {Scheme Procedure} package-derivation @var{store} @var{package} [@var{system}] | |
59688fc4 LC |
2324 | Return the @code{<derivation>} object of @var{package} for @var{system} |
2325 | (@pxref{Derivations}). | |
3dc1970d LC |
2326 | |
2327 | @var{package} must be a valid @code{<package>} object, and @var{system} | |
2328 | must be a string denoting the target system type---e.g., | |
2329 | @code{"x86_64-linux"} for an x86_64 Linux-based GNU system. @var{store} | |
2330 | must be a connection to the daemon, which operates on the store | |
2331 | (@pxref{The Store}). | |
2332 | @end deffn | |
568717fd | 2333 | |
9c1edabd LC |
2334 | @noindent |
2335 | @cindex cross-compilation | |
2336 | Similarly, it is possible to compute a derivation that cross-builds a | |
2337 | package for some other system: | |
2338 | ||
2339 | @deffn {Scheme Procedure} package-cross-derivation @var{store} @ | |
2340 | @var{package} @var{target} [@var{system}] | |
59688fc4 LC |
2341 | Return the @code{<derivation>} object of @var{package} cross-built from |
2342 | @var{system} to @var{target}. | |
9c1edabd LC |
2343 | |
2344 | @var{target} must be a valid GNU triplet denoting the target hardware | |
2345 | and operating system, such as @code{"mips64el-linux-gnu"} | |
2346 | (@pxref{Configuration Names, GNU configuration triplets,, configure, GNU | |
2347 | Configure and Build System}). | |
2348 | @end deffn | |
2349 | ||
87eafdbd TUBK |
2350 | @menu |
2351 | * package Reference :: The package data type. | |
2352 | * origin Reference:: The origin data type. | |
2353 | @end menu | |
2354 | ||
2355 | ||
2356 | @node package Reference | |
2357 | @subsection @code{package} Reference | |
2358 | ||
2359 | This section summarizes all the options available in @code{package} | |
2360 | declarations (@pxref{Defining Packages}). | |
2361 | ||
2362 | @deftp {Data Type} package | |
2363 | This is the data type representing a package recipe. | |
2364 | ||
2365 | @table @asis | |
2366 | @item @code{name} | |
2367 | The name of the package, as a string. | |
2368 | ||
2369 | @item @code{version} | |
2370 | The version of the package, as a string. | |
2371 | ||
2372 | @item @code{source} | |
2373 | An origin object telling how the source code for the package should be | |
2374 | acquired (@pxref{origin Reference}). | |
2375 | ||
2376 | @item @code{build-system} | |
2377 | The build system that should be used to build the package (@pxref{Build | |
2378 | Systems}). | |
2379 | ||
2380 | @item @code{arguments} (default: @code{'()}) | |
2381 | The arguments that should be passed to the build system. This is a | |
2382 | list, typically containing sequential keyword-value pairs. | |
2383 | ||
2384 | @item @code{inputs} (default: @code{'()}) | |
70650c68 LC |
2385 | @itemx @code{native-inputs} (default: @code{'()}) |
2386 | @itemx @code{propagated-inputs} (default: @code{'()}) | |
2387 | @cindex inputs, of packages | |
2388 | These fields list dependencies of the package. Each one is a list of | |
2389 | tuples, where each tuple has a label for the input (a string) as its | |
2390 | first element, a package, origin, or derivation as its second element, | |
2391 | and optionally the name of the output thereof that should be used, which | |
2392 | defaults to @code{"out"} (@pxref{Packages with Multiple Outputs}, for | |
f97c9175 | 2393 | more on package outputs). For example, the list below specifies three |
70650c68 | 2394 | inputs: |
87eafdbd | 2395 | |
70650c68 LC |
2396 | @example |
2397 | `(("libffi" ,libffi) | |
2398 | ("libunistring" ,libunistring) | |
2399 | ("glib:bin" ,glib "bin")) ;the "bin" output of Glib | |
2400 | @end example | |
2401 | ||
2402 | @cindex cross compilation, package dependencies | |
2403 | The distinction between @code{native-inputs} and @code{inputs} is | |
2404 | necessary when considering cross-compilation. When cross-compiling, | |
2405 | dependencies listed in @code{inputs} are built for the @emph{target} | |
2406 | architecture; conversely, dependencies listed in @code{native-inputs} | |
2407 | are built for the architecture of the @emph{build} machine. | |
2408 | ||
f97c9175 AE |
2409 | @code{native-inputs} is typically used to list tools needed at |
2410 | build time, but not at run time, such as Autoconf, Automake, pkg-config, | |
70650c68 LC |
2411 | Gettext, or Bison. @command{guix lint} can report likely mistakes in |
2412 | this area (@pxref{Invoking guix lint}). | |
2413 | ||
2414 | @anchor{package-propagated-inputs} | |
2415 | Lastly, @code{propagated-inputs} is similar to @code{inputs}, but the | |
f97c9175 AE |
2416 | specified packages will be automatically installed alongside the package |
2417 | they belong to (@pxref{package-cmd-propagated-inputs, @command{guix | |
70650c68 LC |
2418 | package}}, for information on how @command{guix package} deals with |
2419 | propagated inputs.) | |
21461f27 | 2420 | |
e0508b6b LC |
2421 | For example this is necessary when a C/C++ library needs headers of |
2422 | another library to compile, or when a pkg-config file refers to another | |
2423 | one @i{via} its @code{Requires} field. | |
2424 | ||
f97c9175 AE |
2425 | Another example where @code{propagated-inputs} is useful is for languages |
2426 | that lack a facility to record the run-time search path akin to the | |
2427 | @code{RUNPATH}of ELF files; this includes Guile, Python, Perl, GHC, and | |
e0508b6b LC |
2428 | more. To ensure that libraries written in those languages can find |
2429 | library code they depend on at run time, run-time dependencies must be | |
2430 | listed in @code{propagated-inputs} rather than @code{inputs}. | |
87eafdbd | 2431 | |
87eafdbd TUBK |
2432 | @item @code{self-native-input?} (default: @code{#f}) |
2433 | This is a Boolean field telling whether the package should use itself as | |
2434 | a native input when cross-compiling. | |
2435 | ||
2436 | @item @code{outputs} (default: @code{'("out")}) | |
2437 | The list of output names of the package. @xref{Packages with Multiple | |
2438 | Outputs}, for typical uses of additional outputs. | |
2439 | ||
2440 | @item @code{native-search-paths} (default: @code{'()}) | |
2441 | @itemx @code{search-paths} (default: @code{'()}) | |
2442 | A list of @code{search-path-specification} objects describing | |
2443 | search-path environment variables honored by the package. | |
2444 | ||
2445 | @item @code{replacement} (default: @code{#f}) | |
f97c9175 | 2446 | This must be either @code{#f} or a package object that will be used as a |
87eafdbd TUBK |
2447 | @dfn{replacement} for this package. @xref{Security Updates, grafts}, |
2448 | for details. | |
2449 | ||
2450 | @item @code{synopsis} | |
2451 | A one-line description of the package. | |
2452 | ||
2453 | @item @code{description} | |
2454 | A more elaborate description of the package. | |
2455 | ||
2456 | @item @code{license} | |
f97c9175 AE |
2457 | The license of the package; a value from @code{(guix licenses)}, |
2458 | or a list of such values. | |
87eafdbd TUBK |
2459 | |
2460 | @item @code{home-page} | |
2461 | The URL to the home-page of the package, as a string. | |
2462 | ||
2463 | @item @code{supported-systems} (default: @var{%supported-systems}) | |
2464 | The list of systems supported by the package, as strings of the form | |
2465 | @code{architecture-kernel}, for example @code{"x86_64-linux"}. | |
2466 | ||
2467 | @item @code{maintainers} (default: @code{'()}) | |
2468 | The list of maintainers of the package, as @code{maintainer} objects. | |
2469 | ||
2470 | @item @code{location} (default: source location of the @code{package} form) | |
f97c9175 | 2471 | The source location of the package. It is useful to override this when |
87eafdbd TUBK |
2472 | inheriting from another package, in which case this field is not |
2473 | automatically corrected. | |
2474 | @end table | |
2475 | @end deftp | |
2476 | ||
2477 | ||
2478 | @node origin Reference | |
2479 | @subsection @code{origin} Reference | |
2480 | ||
2481 | This section summarizes all the options available in @code{origin} | |
2482 | declarations (@pxref{Defining Packages}). | |
2483 | ||
2484 | @deftp {Data Type} origin | |
2485 | This is the data type representing a source code origin. | |
2486 | ||
2487 | @table @asis | |
2488 | @item @code{uri} | |
2489 | An object containing the URI of the source. The object type depends on | |
2490 | the @code{method} (see below). For example, when using the | |
2491 | @var{url-fetch} method of @code{(guix download)}, the valid @code{uri} | |
2492 | values are: a URL represented as a string, or a list thereof. | |
2493 | ||
2494 | @item @code{method} | |
f97c9175 | 2495 | A procedure that handles the URI. |
87eafdbd TUBK |
2496 | |
2497 | Examples include: | |
2498 | ||
2499 | @table @asis | |
2500 | @item @var{url-fetch} from @code{(guix download)} | |
f97c9175 | 2501 | download a file from the HTTP, HTTPS, or FTP URL specified in the |
87eafdbd TUBK |
2502 | @code{uri} field; |
2503 | ||
2504 | @item @var{git-fetch} from @code{(guix git-download)} | |
2505 | clone the Git version control repository, and check out the revision | |
2506 | specified in the @code{uri} field as a @code{git-reference} object; a | |
2507 | @code{git-reference} looks like this: | |
2508 | ||
2509 | @example | |
2510 | (git-reference | |
2511 | (url "git://git.debian.org/git/pkg-shadow/shadow") | |
2512 | (commit "v4.1.5.1")) | |
2513 | @end example | |
2514 | @end table | |
2515 | ||
2516 | @item @code{sha256} | |
2517 | A bytevector containing the SHA-256 hash of the source. Typically the | |
2518 | @code{base32} form is used here to generate the bytevector from a | |
2519 | base-32 string. | |
2520 | ||
2521 | @item @code{file-name} (default: @code{#f}) | |
2522 | The file name under which the source code should be saved. When this is | |
2523 | @code{#f}, a sensible default value will be used in most cases. In case | |
2524 | the source is fetched from a URL, the file name from the URL will be | |
f97c9175 | 2525 | used. For version control checkouts, it is recommended to provide the |
87eafdbd TUBK |
2526 | file name explicitly because the default is not very descriptive. |
2527 | ||
2528 | @item @code{patches} (default: @code{'()}) | |
2529 | A list of file names containing patches to be applied to the source. | |
2530 | ||
2531 | @item @code{snippet} (default: @code{#f}) | |
2532 | A quoted piece of code that will be run in the source directory to make | |
2533 | any modifications, which is sometimes more convenient than a patch. | |
2534 | ||
2535 | @item @code{patch-flags} (default: @code{'("-p1")}) | |
2536 | A list of command-line flags that should be passed to the @code{patch} | |
2537 | command. | |
2538 | ||
2539 | @item @code{patch-inputs} (default: @code{#f}) | |
2540 | Input packages or derivations to the patching process. When this is | |
2541 | @code{#f}, the usual set of inputs necessary for patching are provided, | |
2542 | such as GNU@tie{}Patch. | |
2543 | ||
2544 | @item @code{modules} (default: @code{'()}) | |
2545 | A list of Guile modules that should be loaded during the patching | |
2546 | process and while running the code in the @code{snippet} field. | |
2547 | ||
2548 | @item @code{imported-modules} (default: @code{'()}) | |
2549 | The list of Guile modules to import in the patch derivation, for use by | |
2550 | the @code{snippet}. | |
2551 | ||
2552 | @item @code{patch-guile} (default: @code{#f}) | |
2553 | The Guile package that should be used in the patching process. When | |
2554 | this is @code{#f}, a sensible default is used. | |
2555 | @end table | |
2556 | @end deftp | |
2557 | ||
9c1edabd | 2558 | |
7458bd0a LC |
2559 | @node Build Systems |
2560 | @section Build Systems | |
2561 | ||
2562 | @cindex build system | |
2563 | Each package definition specifies a @dfn{build system} and arguments for | |
2564 | that build system (@pxref{Defining Packages}). This @code{build-system} | |
f97c9175 | 2565 | field represents the build procedure of the package, as well as implicit |
7458bd0a LC |
2566 | dependencies of that build procedure. |
2567 | ||
2568 | Build systems are @code{<build-system>} objects. The interface to | |
2569 | create and manipulate them is provided by the @code{(guix build-system)} | |
2570 | module, and actual build systems are exported by specific modules. | |
2571 | ||
f5fd4fd2 | 2572 | @cindex bag (low-level package representation) |
0d5a559f LC |
2573 | Under the hood, build systems first compile package objects to |
2574 | @dfn{bags}. A @dfn{bag} is like a package, but with less | |
2575 | ornamentation---in other words, a bag is a lower-level representation of | |
2576 | a package, which includes all the inputs of that package, including some | |
2577 | that were implicitly added by the build system. This intermediate | |
2578 | representation is then compiled to a derivation (@pxref{Derivations}). | |
2579 | ||
7458bd0a LC |
2580 | Build systems accept an optional list of @dfn{arguments}. In package |
2581 | definitions, these are passed @i{via} the @code{arguments} field | |
2582 | (@pxref{Defining Packages}). They are typically keyword arguments | |
2583 | (@pxref{Optional Arguments, keyword arguments in Guile,, guile, GNU | |
2584 | Guile Reference Manual}). The value of these arguments is usually | |
2585 | evaluated in the @dfn{build stratum}---i.e., by a Guile process launched | |
2586 | by the daemon (@pxref{Derivations}). | |
2587 | ||
2588 | The main build system is @var{gnu-build-system}, which implements the | |
f97c9175 | 2589 | standard build procedure for GNU and many other packages. It |
7458bd0a LC |
2590 | is provided by the @code{(guix build-system gnu)} module. |
2591 | ||
2592 | @defvr {Scheme Variable} gnu-build-system | |
2593 | @var{gnu-build-system} represents the GNU Build System, and variants | |
2594 | thereof (@pxref{Configuration, configuration and makefile conventions,, | |
2595 | standards, GNU Coding Standards}). | |
2596 | ||
2597 | @cindex build phases | |
f97c9175 | 2598 | In a nutshell, packages using it are configured, built, and installed with |
7458bd0a LC |
2599 | the usual @code{./configure && make && make check && make install} |
2600 | command sequence. In practice, a few additional steps are often needed. | |
2601 | All these steps are split up in separate @dfn{phases}, | |
2602 | notably@footnote{Please see the @code{(guix build gnu-build-system)} | |
2603 | modules for more details about the build phases.}: | |
2604 | ||
2605 | @table @code | |
2606 | @item unpack | |
2607 | Unpack the source tarball, and change the current directory to the | |
2608 | extracted source tree. If the source is actually a directory, copy it | |
2609 | to the build tree, and enter that directory. | |
2610 | ||
2611 | @item patch-source-shebangs | |
2612 | Patch shebangs encountered in source files so they refer to the right | |
2613 | store file names. For instance, this changes @code{#!/bin/sh} to | |
2614 | @code{#!/gnu/store/@dots{}-bash-4.3/bin/sh}. | |
2615 | ||
2616 | @item configure | |
2617 | Run the @file{configure} script with a number of default options, such | |
2618 | as @code{--prefix=/gnu/store/@dots{}}, as well as the options specified | |
2619 | by the @code{#:configure-flags} argument. | |
2620 | ||
2621 | @item build | |
2622 | Run @code{make} with the list of flags specified with | |
0917e80e | 2623 | @code{#:make-flags}. If the @code{#:parallel-build?} argument is true |
7458bd0a LC |
2624 | (the default), build with @code{make -j}. |
2625 | ||
2626 | @item check | |
2627 | Run @code{make check}, or some other target specified with | |
2628 | @code{#:test-target}, unless @code{#:tests? #f} is passed. If the | |
2629 | @code{#:parallel-tests?} argument is true (the default), run @code{make | |
2630 | check -j}. | |
2631 | ||
2632 | @item install | |
2633 | Run @code{make install} with the flags listed in @code{#:make-flags}. | |
2634 | ||
2635 | @item patch-shebangs | |
2636 | Patch shebangs on the installed executable files. | |
2637 | ||
2638 | @item strip | |
2639 | Strip debugging symbols from ELF files (unless @code{#:strip-binaries?} | |
2640 | is false), copying them to the @code{debug} output when available | |
2641 | (@pxref{Installing Debugging Files}). | |
2642 | @end table | |
2643 | ||
2644 | @vindex %standard-phases | |
2645 | The build-side module @code{(guix build gnu-build-system)} defines | |
2646 | @var{%standard-phases} as the default list of build phases. | |
2647 | @var{%standard-phases} is a list of symbol/procedure pairs, where the | |
2648 | procedure implements the actual phase. | |
2649 | ||
2650 | The list of phases used for a particular package can be changed with the | |
2651 | @code{#:phases} parameter. For instance, passing: | |
2652 | ||
2653 | @example | |
c2c5dc79 | 2654 | #:phases (modify-phases %standard-phases (delete 'configure)) |
7458bd0a LC |
2655 | @end example |
2656 | ||
9bf404e9 | 2657 | means that all the phases described above will be used, except the |
7458bd0a LC |
2658 | @code{configure} phase. |
2659 | ||
2660 | In addition, this build system ensures that the ``standard'' environment | |
2661 | for GNU packages is available. This includes tools such as GCC, libc, | |
2662 | Coreutils, Bash, Make, Diffutils, grep, and sed (see the @code{(guix | |
f97c9175 AE |
2663 | build-system gnu)} module for a complete list). We call these the |
2664 | @dfn{implicit inputs} of a package, because package definitions do not | |
7458bd0a LC |
2665 | have to mention them. |
2666 | @end defvr | |
2667 | ||
2668 | Other @code{<build-system>} objects are defined to support other | |
2669 | conventions and tools used by free software packages. They inherit most | |
2670 | of @var{gnu-build-system}, and differ mainly in the set of inputs | |
2671 | implicitly added to the build process, and in the list of phases | |
2672 | executed. Some of these build systems are listed below. | |
2673 | ||
2674 | @defvr {Scheme Variable} cmake-build-system | |
2675 | This variable is exported by @code{(guix build-system cmake)}. It | |
2676 | implements the build procedure for packages using the | |
2677 | @url{http://www.cmake.org, CMake build tool}. | |
2678 | ||
2679 | It automatically adds the @code{cmake} package to the set of inputs. | |
2680 | Which package is used can be specified with the @code{#:cmake} | |
2681 | parameter. | |
9849cfc1 LC |
2682 | |
2683 | The @code{#:configure-flags} parameter is taken as a list of flags | |
2684 | passed to the @command{cmake} command. The @code{#:build-type} | |
2685 | parameter specifies in abstract terms the flags passed to the compiler; | |
2686 | it defaults to @code{"RelWithDebInfo"} (short for ``release mode with | |
2687 | debugging information''), which roughly means that code is compiled with | |
2688 | @code{-O2 -g}, as is the case for Autoconf-based packages by default. | |
7458bd0a LC |
2689 | @end defvr |
2690 | ||
3afcf52b FB |
2691 | @defvr {Scheme Variable} glib-or-gtk-build-system |
2692 | This variable is exported by @code{(guix build-system glib-or-gtk)}. It | |
2693 | is intended for use with packages making use of GLib or GTK+. | |
2694 | ||
2695 | This build system adds the following two phases to the ones defined by | |
2696 | @var{gnu-build-system}: | |
2697 | ||
2698 | @table @code | |
2699 | @item glib-or-gtk-wrap | |
f97c9175 AE |
2700 | The phase @code{glib-or-gtk-wrap} ensures that programs in |
2701 | @file{bin/} are able to find GLib ``schemas'' and | |
3afcf52b FB |
2702 | @uref{https://developer.gnome.org/gtk3/stable/gtk-running.html, GTK+ |
2703 | modules}. This is achieved by wrapping the programs in launch scripts | |
2704 | that appropriately set the @code{XDG_DATA_DIRS} and @code{GTK_PATH} | |
2705 | environment variables. | |
2706 | ||
73aa8ddb LC |
2707 | It is possible to exclude specific package outputs from that wrapping |
2708 | process by listing their names in the | |
2709 | @code{#:glib-or-gtk-wrap-excluded-outputs} parameter. This is useful | |
2710 | when an output is known not to contain any GLib or GTK+ binaries, and | |
2711 | where wrapping would gratuitously add a dependency of that output on | |
2712 | GLib and GTK+. | |
2713 | ||
3afcf52b | 2714 | @item glib-or-gtk-compile-schemas |
f97c9175 | 2715 | The phase @code{glib-or-gtk-compile-schemas} makes sure that all |
3afcf52b | 2716 | @uref{https://developer.gnome.org/gio/stable/glib-compile-schemas.html, |
f97c9175 | 2717 | GSettings schemas} of GLib are compiled. Compilation is performed by the |
3afcf52b FB |
2718 | @command{glib-compile-schemas} program. It is provided by the package |
2719 | @code{glib:bin} which is automatically imported by the build system. | |
2720 | The @code{glib} package providing @command{glib-compile-schemas} can be | |
2721 | specified with the @code{#:glib} parameter. | |
2722 | @end table | |
2723 | ||
2724 | Both phases are executed after the @code{install} phase. | |
2725 | @end defvr | |
2726 | ||
7458bd0a LC |
2727 | @defvr {Scheme Variable} python-build-system |
2728 | This variable is exported by @code{(guix build-system python)}. It | |
2729 | implements the more or less standard build procedure used by Python | |
2730 | packages, which consists in running @code{python setup.py build} and | |
2731 | then @code{python setup.py install --prefix=/gnu/store/@dots{}}. | |
2732 | ||
2733 | For packages that install stand-alone Python programs under @code{bin/}, | |
f97c9175 | 2734 | it takes care of wrapping these programs so that their @code{PYTHONPATH} |
7458bd0a LC |
2735 | environment variable points to all the Python libraries they depend on. |
2736 | ||
2737 | Which Python package is used can be specified with the @code{#:python} | |
2738 | parameter. | |
2739 | @end defvr | |
2740 | ||
2741 | @defvr {Scheme Variable} perl-build-system | |
2742 | This variable is exported by @code{(guix build-system perl)}. It | |
2d2a53fc EB |
2743 | implements the standard build procedure for Perl packages, which either |
2744 | consists in running @code{perl Build.PL --prefix=/gnu/store/@dots{}}, | |
2745 | followed by @code{Build} and @code{Build install}; or in running | |
2746 | @code{perl Makefile.PL PREFIX=/gnu/store/@dots{}}, followed by | |
f97c9175 | 2747 | @code{make} and @code{make install}, depending on which of |
2d2a53fc EB |
2748 | @code{Build.PL} or @code{Makefile.PL} is present in the package |
2749 | distribution. Preference is given to the former if both @code{Build.PL} | |
2750 | and @code{Makefile.PL} exist in the package distribution. This | |
2751 | preference can be reversed by specifying @code{#t} for the | |
2752 | @code{#:make-maker?} parameter. | |
2753 | ||
2754 | The initial @code{perl Makefile.PL} or @code{perl Build.PL} invocation | |
2755 | passes flags specified by the @code{#:make-maker-flags} or | |
2756 | @code{#:module-build-flags} parameter, respectively. | |
7458bd0a LC |
2757 | |
2758 | Which Perl package is used can be specified with @code{#:perl}. | |
2759 | @end defvr | |
2760 | ||
f8f3bef6 RW |
2761 | @defvr {Scheme Variable} r-build-system |
2762 | This variable is exported by @code{(guix build-system r)}. It | |
2763 | implements the build procedure used by @uref{http://r-project.org, R} | |
2764 | packages, which essentially is little more than running @code{R CMD | |
2765 | INSTALL --library=/gnu/store/@dots{}} in an environment where | |
2766 | @code{R_LIBS_SITE} contains the paths to all R package inputs. Tests | |
2767 | are run after installation using the R function | |
2768 | @code{tools::testInstalledPackage}. | |
2769 | @end defvr | |
2770 | ||
c08f9818 DT |
2771 | @defvr {Scheme Variable} ruby-build-system |
2772 | This variable is exported by @code{(guix build-system ruby)}. It | |
2773 | implements the RubyGems build procedure used by Ruby packages, which | |
2774 | involves running @code{gem build} followed by @code{gem install}. | |
2775 | ||
5dc87623 DT |
2776 | The @code{source} field of a package that uses this build system |
2777 | typically references a gem archive, since this is the format that Ruby | |
2778 | developers use when releasing their software. The build system unpacks | |
2779 | the gem archive, potentially patches the source, runs the test suite, | |
2780 | repackages the gem, and installs it. Additionally, directories and | |
2781 | tarballs may be referenced to allow building unreleased gems from Git or | |
2782 | a traditional source release tarball. | |
e83c6d00 | 2783 | |
c08f9818 | 2784 | Which Ruby package is used can be specified with the @code{#:ruby} |
6e9f2913 PP |
2785 | parameter. A list of additional flags to be passed to the @command{gem} |
2786 | command can be specified with the @code{#:gem-flags} parameter. | |
c08f9818 | 2787 | @end defvr |
7458bd0a | 2788 | |
a677c726 RW |
2789 | @defvr {Scheme Variable} waf-build-system |
2790 | This variable is exported by @code{(guix build-system waf)}. It | |
2791 | implements a build procedure around the @code{waf} script. The common | |
2792 | phases---@code{configure}, @code{build}, and @code{install}---are | |
2793 | implemented by passing their names as arguments to the @code{waf} | |
2794 | script. | |
2795 | ||
2796 | The @code{waf} script is executed by the Python interpreter. Which | |
2797 | Python package is used to run the script can be specified with the | |
2798 | @code{#:python} parameter. | |
2799 | @end defvr | |
2800 | ||
14dfdf2e FB |
2801 | @defvr {Scheme Variable} haskell-build-system |
2802 | This variable is exported by @code{(guix build-system haskell)}. It | |
2803 | implements the Cabal build procedure used by Haskell packages, which | |
2804 | involves running @code{runhaskell Setup.hs configure | |
2805 | --prefix=/gnu/store/@dots{}} and @code{runhaskell Setup.hs build}. | |
2806 | Instead of installing the package by running @code{runhaskell Setup.hs | |
2807 | install}, to avoid trying to register libraries in the read-only | |
2808 | compiler store directory, the build system uses @code{runhaskell | |
2809 | Setup.hs copy}, followed by @code{runhaskell Setup.hs register}. In | |
2810 | addition, the build system generates the package documentation by | |
2811 | running @code{runhaskell Setup.hs haddock}, unless @code{#:haddock? #f} | |
2812 | is passed. Optional Haddock parameters can be passed with the help of | |
2813 | the @code{#:haddock-flags} parameter. If the file @code{Setup.hs} is | |
2814 | not found, the build system looks for @code{Setup.lhs} instead. | |
2815 | ||
2816 | Which Haskell compiler is used can be specified with the @code{#:haskell} | |
a54bd6d7 | 2817 | parameter which defaults to @code{ghc}. |
14dfdf2e FB |
2818 | @end defvr |
2819 | ||
e9137a53 FB |
2820 | @defvr {Scheme Variable} emacs-build-system |
2821 | This variable is exported by @code{(guix build-system emacs)}. It | |
f97c9175 AE |
2822 | implements an installation procedure similar to the packaging system |
2823 | of Emacs itself (@pxref{Packages,,, emacs, The GNU Emacs Manual}). | |
e9137a53 FB |
2824 | |
2825 | It first creates the @code{@var{package}-autoloads.el} file, then it | |
2826 | byte compiles all Emacs Lisp files. Differently from the Emacs | |
2827 | packaging system, the Info documentation files are moved to the standard | |
2828 | documentation directory and the @file{dir} file is deleted. Each | |
2829 | package is installed in its own directory under | |
2830 | @file{share/emacs/site-lisp/guix.d}. | |
2831 | @end defvr | |
2832 | ||
7458bd0a LC |
2833 | Lastly, for packages that do not need anything as sophisticated, a |
2834 | ``trivial'' build system is provided. It is trivial in the sense that | |
2835 | it provides basically no support: it does not pull any implicit inputs, | |
2836 | and does not have a notion of build phases. | |
2837 | ||
2838 | @defvr {Scheme Variable} trivial-build-system | |
2839 | This variable is exported by @code{(guix build-system trivial)}. | |
2840 | ||
2841 | This build system requires a @code{#:builder} argument. This argument | |
f97c9175 | 2842 | must be a Scheme expression that builds the package output(s)---as |
7458bd0a LC |
2843 | with @code{build-expression->derivation} (@pxref{Derivations, |
2844 | @code{build-expression->derivation}}). | |
2845 | @end defvr | |
2846 | ||
568717fd LC |
2847 | @node The Store |
2848 | @section The Store | |
2849 | ||
e531ac2a LC |
2850 | @cindex store |
2851 | @cindex store paths | |
2852 | ||
f97c9175 AE |
2853 | Conceptually, the @dfn{store} is the place where derivations that have |
2854 | been built successfully are stored---by default, @file{/gnu/store}. | |
e531ac2a | 2855 | Sub-directories in the store are referred to as @dfn{store paths}. The |
4988dd40 | 2856 | store has an associated database that contains information such as the |
e531ac2a LC |
2857 | store paths referred to by each store path, and the list of @emph{valid} |
2858 | store paths---paths that result from a successful build. | |
2859 | ||
2860 | The store is always accessed by the daemon on behalf of its clients | |
2861 | (@pxref{Invoking guix-daemon}). To manipulate the store, clients | |
f97c9175 AE |
2862 | connect to the daemon over a Unix-domain socket, send requests to it, |
2863 | and read the result---these are remote procedure calls, or RPCs. | |
e531ac2a LC |
2864 | |
2865 | The @code{(guix store)} module provides procedures to connect to the | |
2866 | daemon, and to perform RPCs. These are described below. | |
2867 | ||
2868 | @deffn {Scheme Procedure} open-connection [@var{file}] [#:reserve-space? #t] | |
2869 | Connect to the daemon over the Unix-domain socket at @var{file}. When | |
2870 | @var{reserve-space?} is true, instruct it to reserve a little bit of | |
2871 | extra space on the file system so that the garbage collector can still | |
f97c9175 | 2872 | operate should the disk become full. Return a server object. |
e531ac2a LC |
2873 | |
2874 | @var{file} defaults to @var{%default-socket-path}, which is the normal | |
2875 | location given the options that were passed to @command{configure}. | |
2876 | @end deffn | |
2877 | ||
2878 | @deffn {Scheme Procedure} close-connection @var{server} | |
2879 | Close the connection to @var{server}. | |
2880 | @end deffn | |
2881 | ||
2882 | @defvr {Scheme Variable} current-build-output-port | |
2883 | This variable is bound to a SRFI-39 parameter, which refers to the port | |
2884 | where build and error logs sent by the daemon should be written. | |
2885 | @end defvr | |
2886 | ||
2887 | Procedures that make RPCs all take a server object as their first | |
2888 | argument. | |
2889 | ||
2890 | @deffn {Scheme Procedure} valid-path? @var{server} @var{path} | |
2891 | Return @code{#t} when @var{path} is a valid store path. | |
2892 | @end deffn | |
2893 | ||
cfbf9160 | 2894 | @deffn {Scheme Procedure} add-text-to-store @var{server} @var{name} @var{text} [@var{references}] |
e531ac2a LC |
2895 | Add @var{text} under file @var{name} in the store, and return its store |
2896 | path. @var{references} is the list of store paths referred to by the | |
2897 | resulting store path. | |
2898 | @end deffn | |
2899 | ||
874e6874 | 2900 | @deffn {Scheme Procedure} build-derivations @var{server} @var{derivations} |
59688fc4 LC |
2901 | Build @var{derivations} (a list of @code{<derivation>} objects or |
2902 | derivation paths), and return when the worker is done building them. | |
2903 | Return @code{#t} on success. | |
874e6874 LC |
2904 | @end deffn |
2905 | ||
b860f382 LC |
2906 | Note that the @code{(guix monads)} module provides a monad as well as |
2907 | monadic versions of the above procedures, with the goal of making it | |
2908 | more convenient to work with code that accesses the store (@pxref{The | |
2909 | Store Monad}). | |
2910 | ||
e531ac2a LC |
2911 | @c FIXME |
2912 | @i{This section is currently incomplete.} | |
568717fd LC |
2913 | |
2914 | @node Derivations | |
2915 | @section Derivations | |
2916 | ||
874e6874 LC |
2917 | @cindex derivations |
2918 | Low-level build actions and the environment in which they are performed | |
2919 | are represented by @dfn{derivations}. A derivation contain the | |
2920 | following pieces of information: | |
2921 | ||
2922 | @itemize | |
2923 | @item | |
2924 | The outputs of the derivation---derivations produce at least one file or | |
2925 | directory in the store, but may produce more. | |
2926 | ||
2927 | @item | |
2928 | The inputs of the derivations, which may be other derivations or plain | |
2929 | files in the store (patches, build scripts, etc.) | |
2930 | ||
2931 | @item | |
2932 | The system type targeted by the derivation---e.g., @code{x86_64-linux}. | |
2933 | ||
2934 | @item | |
2935 | The file name of a build script in the store, along with the arguments | |
2936 | to be passed. | |
2937 | ||
2938 | @item | |
2939 | A list of environment variables to be defined. | |
2940 | ||
2941 | @end itemize | |
2942 | ||
2943 | @cindex derivation path | |
2944 | Derivations allow clients of the daemon to communicate build actions to | |
2945 | the store. They exist in two forms: as an in-memory representation, | |
2946 | both on the client- and daemon-side, and as files in the store whose | |
2947 | name end in @code{.drv}---these files are referred to as @dfn{derivation | |
2948 | paths}. Derivations paths can be passed to the @code{build-derivations} | |
2949 | procedure to perform the build actions they prescribe (@pxref{The | |
2950 | Store}). | |
2951 | ||
2952 | The @code{(guix derivations)} module provides a representation of | |
2953 | derivations as Scheme objects, along with procedures to create and | |
2954 | otherwise manipulate derivations. The lowest-level primitive to create | |
2955 | a derivation is the @code{derivation} procedure: | |
2956 | ||
1909431c LC |
2957 | @deffn {Scheme Procedure} derivation @var{store} @var{name} @var{builder} @ |
2958 | @var{args} [#:outputs '("out")] [#:hash #f] [#:hash-algo #f] @ | |
2096ef47 | 2959 | [#:recursive? #f] [#:inputs '()] [#:env-vars '()] @ |
1909431c | 2960 | [#:system (%current-system)] [#:references-graphs #f] @ |
4a6aeb67 LC |
2961 | [#:allowed-references #f] [#:leaked-env-vars #f] [#:local-build? #f] @ |
2962 | [#:substitutable? #t] | |
59688fc4 LC |
2963 | Build a derivation with the given arguments, and return the resulting |
2964 | @code{<derivation>} object. | |
874e6874 | 2965 | |
2096ef47 | 2966 | When @var{hash} and @var{hash-algo} are given, a |
874e6874 | 2967 | @dfn{fixed-output derivation} is created---i.e., one whose result is |
36bbbbd1 LC |
2968 | known in advance, such as a file download. If, in addition, |
2969 | @var{recursive?} is true, then that fixed output may be an executable | |
2970 | file or a directory and @var{hash} must be the hash of an archive | |
2971 | containing this output. | |
5b0c9d16 | 2972 | |
858e9282 | 2973 | When @var{references-graphs} is true, it must be a list of file |
5b0c9d16 LC |
2974 | name/store path pairs. In that case, the reference graph of each store |
2975 | path is exported in the build environment in the corresponding file, in | |
2976 | a simple text format. | |
1909431c | 2977 | |
b53be755 LC |
2978 | When @var{allowed-references} is true, it must be a list of store items |
2979 | or outputs that the derivation's output may refer to. | |
2980 | ||
c0468155 LC |
2981 | When @var{leaked-env-vars} is true, it must be a list of strings |
2982 | denoting environment variables that are allowed to ``leak'' from the | |
2983 | daemon's environment to the build environment. This is only applicable | |
2984 | to fixed-output derivations---i.e., when @var{hash} is true. The main | |
2985 | use is to allow variables such as @code{http_proxy} to be passed to | |
2986 | derivations that download files. | |
2987 | ||
1909431c LC |
2988 | When @var{local-build?} is true, declare that the derivation is not a |
2989 | good candidate for offloading and should rather be built locally | |
2990 | (@pxref{Daemon Offload Setup}). This is the case for small derivations | |
2991 | where the costs of data transfers would outweigh the benefits. | |
4a6aeb67 LC |
2992 | |
2993 | When @var{substitutable?} is false, declare that substitutes of the | |
2994 | derivation's output should not be used (@pxref{Substitutes}). This is | |
2995 | useful, for instance, when building packages that capture details of the | |
2996 | host CPU instruction set. | |
874e6874 LC |
2997 | @end deffn |
2998 | ||
2999 | @noindent | |
3000 | Here's an example with a shell script as its builder, assuming | |
3001 | @var{store} is an open connection to the daemon, and @var{bash} points | |
3002 | to a Bash executable in the store: | |
3003 | ||
3004 | @lisp | |
3005 | (use-modules (guix utils) | |
3006 | (guix store) | |
3007 | (guix derivations)) | |
3008 | ||
59688fc4 LC |
3009 | (let ((builder ; add the Bash script to the store |
3010 | (add-text-to-store store "my-builder.sh" | |
3011 | "echo hello world > $out\n" '()))) | |
3012 | (derivation store "foo" | |
3013 | bash `("-e" ,builder) | |
21b679f6 | 3014 | #:inputs `((,bash) (,builder)) |
59688fc4 | 3015 | #:env-vars '(("HOME" . "/homeless")))) |
834129e0 | 3016 | @result{} #<derivation /gnu/store/@dots{}-foo.drv => /gnu/store/@dots{}-foo> |
874e6874 LC |
3017 | @end lisp |
3018 | ||
21b679f6 LC |
3019 | As can be guessed, this primitive is cumbersome to use directly. A |
3020 | better approach is to write build scripts in Scheme, of course! The | |
3021 | best course of action for that is to write the build code as a | |
3022 | ``G-expression'', and to pass it to @code{gexp->derivation}. For more | |
6621cdb6 | 3023 | information, @pxref{G-Expressions}. |
21b679f6 | 3024 | |
f2fadbc1 AE |
3025 | Once upon a time, @code{gexp->derivation} did not exist and constructing |
3026 | derivations with build code written in Scheme was achieved with | |
3027 | @code{build-expression->derivation}, documented below. This procedure | |
3028 | is now deprecated in favor of the much nicer @code{gexp->derivation}. | |
3029 | ||
3030 | @deffn {Scheme Procedure} build-expression->derivation @var{store} @ | |
3031 | @var{name} @var{exp} @ | |
3032 | [#:system (%current-system)] [#:inputs '()] @ | |
3033 | [#:outputs '("out")] [#:hash #f] [#:hash-algo #f] @ | |
3034 | [#:recursive? #f] [#:env-vars '()] [#:modules '()] @ | |
3035 | [#:references-graphs #f] [#:allowed-references #f] @ | |
3036 | [#:local-build? #f] [#:substitutable? #t] [#:guile-for-build #f] | |
3037 | Return a derivation that executes Scheme expression @var{exp} as a | |
3038 | builder for derivation @var{name}. @var{inputs} must be a list of | |
3039 | @code{(name drv-path sub-drv)} tuples; when @var{sub-drv} is omitted, | |
3040 | @code{"out"} is assumed. @var{modules} is a list of names of Guile | |
3041 | modules from the current search path to be copied in the store, | |
3042 | compiled, and made available in the load path during the execution of | |
3043 | @var{exp}---e.g., @code{((guix build utils) (guix build | |
3044 | gnu-build-system))}. | |
3045 | ||
3046 | @var{exp} is evaluated in an environment where @code{%outputs} is bound | |
3047 | to a list of output/path pairs, and where @code{%build-inputs} is bound | |
3048 | to a list of string/output-path pairs made from @var{inputs}. | |
3049 | Optionally, @var{env-vars} is a list of string pairs specifying the name | |
3050 | and value of environment variables visible to the builder. The builder | |
3051 | terminates by passing the result of @var{exp} to @code{exit}; thus, when | |
3052 | @var{exp} returns @code{#f}, the build is considered to have failed. | |
3053 | ||
3054 | @var{exp} is built using @var{guile-for-build} (a derivation). When | |
3055 | @var{guile-for-build} is omitted or is @code{#f}, the value of the | |
3056 | @code{%guile-for-build} fluid is used instead. | |
3057 | ||
3058 | See the @code{derivation} procedure for the meaning of | |
3059 | @var{references-graphs}, @var{allowed-references}, @var{local-build?}, | |
3060 | and @var{substitutable?}. | |
3061 | @end deffn | |
3062 | ||
3063 | @noindent | |
3064 | Here's an example of a single-output derivation that creates a directory | |
3065 | containing one file: | |
3066 | ||
3067 | @lisp | |
3068 | (let ((builder '(let ((out (assoc-ref %outputs "out"))) | |
3069 | (mkdir out) ; create /gnu/store/@dots{}-goo | |
3070 | (call-with-output-file (string-append out "/test") | |
3071 | (lambda (p) | |
3072 | (display '(hello guix) p)))))) | |
3073 | (build-expression->derivation store "goo" builder)) | |
3074 | ||
3075 | @result{} #<derivation /gnu/store/@dots{}-goo.drv => @dots{}> | |
3076 | @end lisp | |
3077 | ||
568717fd | 3078 | |
b860f382 LC |
3079 | @node The Store Monad |
3080 | @section The Store Monad | |
3081 | ||
3082 | @cindex monad | |
3083 | ||
3084 | The procedures that operate on the store described in the previous | |
3085 | sections all take an open connection to the build daemon as their first | |
3086 | argument. Although the underlying model is functional, they either have | |
3087 | side effects or depend on the current state of the store. | |
3088 | ||
3089 | The former is inconvenient: the connection to the build daemon has to be | |
3090 | carried around in all those functions, making it impossible to compose | |
3091 | functions that do not take that parameter with functions that do. The | |
3092 | latter can be problematic: since store operations have side effects | |
3093 | and/or depend on external state, they have to be properly sequenced. | |
3094 | ||
3095 | @cindex monadic values | |
3096 | @cindex monadic functions | |
3097 | This is where the @code{(guix monads)} module comes in. This module | |
3098 | provides a framework for working with @dfn{monads}, and a particularly | |
3099 | useful monad for our uses, the @dfn{store monad}. Monads are a | |
3100 | construct that allows two things: associating ``context'' with values | |
3101 | (in our case, the context is the store), and building sequences of | |
561fb6c3 | 3102 | computations (here computations include accesses to the store.) Values |
b860f382 LC |
3103 | in a monad---values that carry this additional context---are called |
3104 | @dfn{monadic values}; procedures that return such values are called | |
3105 | @dfn{monadic procedures}. | |
3106 | ||
3107 | Consider this ``normal'' procedure: | |
3108 | ||
3109 | @example | |
45adbd62 LC |
3110 | (define (sh-symlink store) |
3111 | ;; Return a derivation that symlinks the 'bash' executable. | |
3112 | (let* ((drv (package-derivation store bash)) | |
3113 | (out (derivation->output-path drv)) | |
3114 | (sh (string-append out "/bin/bash"))) | |
3115 | (build-expression->derivation store "sh" | |
3116 | `(symlink ,sh %output)))) | |
b860f382 LC |
3117 | @end example |
3118 | ||
c6f30b81 LC |
3119 | Using @code{(guix monads)} and @code{(guix gexp)}, it may be rewritten |
3120 | as a monadic function: | |
b860f382 LC |
3121 | |
3122 | @example | |
45adbd62 | 3123 | (define (sh-symlink) |
b860f382 | 3124 | ;; Same, but return a monadic value. |
c6f30b81 LC |
3125 | (mlet %store-monad ((drv (package->derivation bash))) |
3126 | (gexp->derivation "sh" | |
3127 | #~(symlink (string-append #$drv "/bin/bash") | |
3128 | #$output)))) | |
b860f382 LC |
3129 | @end example |
3130 | ||
c6f30b81 LC |
3131 | There several things to note in the second version: the @code{store} |
3132 | parameter is now implicit and is ``threaded'' in the calls to the | |
3133 | @code{package->derivation} and @code{gexp->derivation} monadic | |
3134 | procedures, and the monadic value returned by @code{package->derivation} | |
3135 | is @dfn{bound} using @code{mlet} instead of plain @code{let}. | |
3136 | ||
3137 | As it turns out, the call to @code{package->derivation} can even be | |
3138 | omitted since it will take place implicitly, as we will see later | |
3139 | (@pxref{G-Expressions}): | |
3140 | ||
3141 | @example | |
3142 | (define (sh-symlink) | |
3143 | (gexp->derivation "sh" | |
3144 | #~(symlink (string-append #$bash "/bin/bash") | |
3145 | #$output))) | |
3146 | @end example | |
b860f382 | 3147 | |
7ce21611 LC |
3148 | @c See |
3149 | @c <https://syntaxexclamation.wordpress.com/2014/06/26/escaping-continuations/> | |
3150 | @c for the funny quote. | |
3151 | Calling the monadic @code{sh-symlink} has no effect. As someone once | |
3152 | said, ``you exit a monad like you exit a building on fire: by running''. | |
3153 | So, to exit the monad and get the desired effect, one must use | |
3154 | @code{run-with-store}: | |
b860f382 LC |
3155 | |
3156 | @example | |
8e9aa37f CAW |
3157 | (run-with-store (open-connection) (sh-symlink)) |
3158 | @result{} /gnu/store/...-sh-symlink | |
b860f382 LC |
3159 | @end example |
3160 | ||
f97c9175 | 3161 | Note that the @code{(guix monad-repl)} module extends the Guile REPL with |
b9b86078 | 3162 | new ``meta-commands'' to make it easier to deal with monadic procedures: |
f97c9175 | 3163 | @code{run-in-store}, and @code{enter-store-monad}. The former is used |
b9b86078 LC |
3164 | to ``run'' a single monadic value through the store: |
3165 | ||
3166 | @example | |
3167 | scheme@@(guile-user)> ,run-in-store (package->derivation hello) | |
3168 | $1 = #<derivation /gnu/store/@dots{}-hello-2.9.drv => @dots{}> | |
3169 | @end example | |
3170 | ||
3171 | The latter enters a recursive REPL, where all the return values are | |
3172 | automatically run through the store: | |
3173 | ||
3174 | @example | |
3175 | scheme@@(guile-user)> ,enter-store-monad | |
3176 | store-monad@@(guile-user) [1]> (package->derivation hello) | |
3177 | $2 = #<derivation /gnu/store/@dots{}-hello-2.9.drv => @dots{}> | |
3178 | store-monad@@(guile-user) [1]> (text-file "foo" "Hello!") | |
3179 | $3 = "/gnu/store/@dots{}-foo" | |
3180 | store-monad@@(guile-user) [1]> ,q | |
3181 | scheme@@(guile-user)> | |
3182 | @end example | |
3183 | ||
3184 | @noindent | |
3185 | Note that non-monadic values cannot be returned in the | |
3186 | @code{store-monad} REPL. | |
3187 | ||
e87f0591 LC |
3188 | The main syntactic forms to deal with monads in general are provided by |
3189 | the @code{(guix monads)} module and are described below. | |
b860f382 LC |
3190 | |
3191 | @deffn {Scheme Syntax} with-monad @var{monad} @var{body} ... | |
3192 | Evaluate any @code{>>=} or @code{return} forms in @var{body} as being | |
3193 | in @var{monad}. | |
3194 | @end deffn | |
3195 | ||
3196 | @deffn {Scheme Syntax} return @var{val} | |
3197 | Return a monadic value that encapsulates @var{val}. | |
3198 | @end deffn | |
3199 | ||
751630c9 | 3200 | @deffn {Scheme Syntax} >>= @var{mval} @var{mproc} ... |
b860f382 | 3201 | @dfn{Bind} monadic value @var{mval}, passing its ``contents'' to monadic |
751630c9 LC |
3202 | procedures @var{mproc}@dots{}@footnote{This operation is commonly |
3203 | referred to as ``bind'', but that name denotes an unrelated procedure in | |
3204 | Guile. Thus we use this somewhat cryptic symbol inherited from the | |
3205 | Haskell language.}. There can be one @var{mproc} or several of them, as | |
3206 | in this example: | |
3207 | ||
3208 | @example | |
3209 | (run-with-state | |
3210 | (with-monad %state-monad | |
3211 | (>>= (return 1) | |
3212 | (lambda (x) (return (+ 1 x))) | |
3213 | (lambda (x) (return (* 2 x))))) | |
3214 | 'some-state) | |
3215 | ||
3216 | @result{} 4 | |
3217 | @result{} some-state | |
3218 | @end example | |
b860f382 LC |
3219 | @end deffn |
3220 | ||
3221 | @deffn {Scheme Syntax} mlet @var{monad} ((@var{var} @var{mval}) ...) @ | |
3222 | @var{body} ... | |
3223 | @deffnx {Scheme Syntax} mlet* @var{monad} ((@var{var} @var{mval}) ...) @ | |
3224 | @var{body} ... | |
3225 | Bind the variables @var{var} to the monadic values @var{mval} in | |
3226 | @var{body}. The form (@var{var} -> @var{val}) binds @var{var} to the | |
3227 | ``normal'' value @var{val}, as per @code{let}. | |
3228 | ||
3229 | @code{mlet*} is to @code{mlet} what @code{let*} is to @code{let} | |
3230 | (@pxref{Local Bindings,,, guile, GNU Guile Reference Manual}). | |
3231 | @end deffn | |
3232 | ||
405a9d4e LC |
3233 | @deffn {Scheme System} mbegin @var{monad} @var{mexp} ... |
3234 | Bind @var{mexp} and the following monadic expressions in sequence, | |
3235 | returning the result of the last expression. | |
3236 | ||
3237 | This is akin to @code{mlet}, except that the return values of the | |
3238 | monadic expressions are ignored. In that sense, it is analogous to | |
3239 | @code{begin}, but applied to monadic expressions. | |
3240 | @end deffn | |
3241 | ||
561fb6c3 LC |
3242 | @cindex state monad |
3243 | The @code{(guix monads)} module provides the @dfn{state monad}, which | |
3244 | allows an additional value---the state---to be @emph{threaded} through | |
3245 | monadic procedure calls. | |
3246 | ||
3247 | @defvr {Scheme Variable} %state-monad | |
3248 | The state monad. Procedures in the state monad can access and change | |
3249 | the state that is threaded. | |
3250 | ||
3251 | Consider the example below. The @code{square} procedure returns a value | |
3252 | in the state monad. It returns the square of its argument, but also | |
3253 | increments the current state value: | |
3254 | ||
3255 | @example | |
3256 | (define (square x) | |
3257 | (mlet %state-monad ((count (current-state))) | |
3258 | (mbegin %state-monad | |
3259 | (set-current-state (+ 1 count)) | |
3260 | (return (* x x))))) | |
3261 | ||
3262 | (run-with-state (sequence %state-monad (map square (iota 3))) 0) | |
3263 | @result{} (0 1 4) | |
3264 | @result{} 3 | |
3265 | @end example | |
3266 | ||
3267 | When ``run'' through @var{%state-monad}, we obtain that additional state | |
3268 | value, which is the number of @code{square} calls. | |
3269 | @end defvr | |
3270 | ||
3271 | @deffn {Monadic Procedure} current-state | |
3272 | Return the current state as a monadic value. | |
3273 | @end deffn | |
3274 | ||
3275 | @deffn {Monadic Procedure} set-current-state @var{value} | |
3276 | Set the current state to @var{value} and return the previous state as a | |
3277 | monadic value. | |
3278 | @end deffn | |
3279 | ||
3280 | @deffn {Monadic Procedure} state-push @var{value} | |
3281 | Push @var{value} to the current state, which is assumed to be a list, | |
3282 | and return the previous state as a monadic value. | |
3283 | @end deffn | |
3284 | ||
3285 | @deffn {Monadic Procedure} state-pop | |
3286 | Pop a value from the current state and return it as a monadic value. | |
3287 | The state is assumed to be a list. | |
3288 | @end deffn | |
3289 | ||
3290 | @deffn {Scheme Procedure} run-with-state @var{mval} [@var{state}] | |
3291 | Run monadic value @var{mval} starting with @var{state} as the initial | |
3292 | state. Return two values: the resulting value, and the resulting state. | |
3293 | @end deffn | |
3294 | ||
e87f0591 LC |
3295 | The main interface to the store monad, provided by the @code{(guix |
3296 | store)} module, is as follows. | |
b860f382 LC |
3297 | |
3298 | @defvr {Scheme Variable} %store-monad | |
561fb6c3 LC |
3299 | The store monad---an alias for @var{%state-monad}. |
3300 | ||
3301 | Values in the store monad encapsulate accesses to the store. When its | |
3302 | effect is needed, a value of the store monad must be ``evaluated'' by | |
3303 | passing it to the @code{run-with-store} procedure (see below.) | |
b860f382 LC |
3304 | @end defvr |
3305 | ||
3306 | @deffn {Scheme Procedure} run-with-store @var{store} @var{mval} [#:guile-for-build] [#:system (%current-system)] | |
3307 | Run @var{mval}, a monadic value in the store monad, in @var{store}, an | |
3308 | open store connection. | |
3309 | @end deffn | |
3310 | ||
ad372953 | 3311 | @deffn {Monadic Procedure} text-file @var{name} @var{text} [@var{references}] |
b860f382 | 3312 | Return as a monadic value the absolute file name in the store of the file |
ad372953 LC |
3313 | containing @var{text}, a string. @var{references} is a list of store items that the |
3314 | resulting text file refers to; it defaults to the empty list. | |
45adbd62 LC |
3315 | @end deffn |
3316 | ||
0a90af15 LC |
3317 | @deffn {Monadic Procedure} interned-file @var{file} [@var{name}] @ |
3318 | [#:recursive? #t] | |
3319 | Return the name of @var{file} once interned in the store. Use | |
3320 | @var{name} as its store name, or the basename of @var{file} if | |
3321 | @var{name} is omitted. | |
3322 | ||
3323 | When @var{recursive?} is true, the contents of @var{file} are added | |
3324 | recursively; if @var{file} designates a flat file and @var{recursive?} | |
3325 | is true, its contents are added, and its permission bits are kept. | |
3326 | ||
3327 | The example below adds a file to the store, under two different names: | |
3328 | ||
3329 | @example | |
3330 | (run-with-store (open-connection) | |
3331 | (mlet %store-monad ((a (interned-file "README")) | |
3332 | (b (interned-file "README" "LEGU-MIN"))) | |
3333 | (return (list a b)))) | |
3334 | ||
3335 | @result{} ("/gnu/store/rwm@dots{}-README" "/gnu/store/44i@dots{}-LEGU-MIN") | |
3336 | @end example | |
3337 | ||
3338 | @end deffn | |
3339 | ||
e87f0591 LC |
3340 | The @code{(guix packages)} module exports the following package-related |
3341 | monadic procedures: | |
3342 | ||
b860f382 | 3343 | @deffn {Monadic Procedure} package-file @var{package} [@var{file}] @ |
4231f05b | 3344 | [#:system (%current-system)] [#:target #f] @ |
f97c9175 AE |
3345 | [#:output "out"] |
3346 | Return as a monadic | |
b860f382 LC |
3347 | value in the absolute file name of @var{file} within the @var{output} |
3348 | directory of @var{package}. When @var{file} is omitted, return the name | |
4231f05b LC |
3349 | of the @var{output} directory of @var{package}. When @var{target} is |
3350 | true, use it as a cross-compilation target triplet. | |
b860f382 LC |
3351 | @end deffn |
3352 | ||
b860f382 | 3353 | @deffn {Monadic Procedure} package->derivation @var{package} [@var{system}] |
4231f05b LC |
3354 | @deffnx {Monadic Procedure} package->cross-derivation @var{package} @ |
3355 | @var{target} [@var{system}] | |
3356 | Monadic version of @code{package-derivation} and | |
3357 | @code{package-cross-derivation} (@pxref{Defining Packages}). | |
b860f382 LC |
3358 | @end deffn |
3359 | ||
3360 | ||
21b679f6 LC |
3361 | @node G-Expressions |
3362 | @section G-Expressions | |
3363 | ||
3364 | @cindex G-expression | |
3365 | @cindex build code quoting | |
3366 | So we have ``derivations'', which represent a sequence of build actions | |
3367 | to be performed to produce an item in the store (@pxref{Derivations}). | |
f97c9175 | 3368 | These build actions are performed when asking the daemon to actually |
21b679f6 LC |
3369 | build the derivations; they are run by the daemon in a container |
3370 | (@pxref{Invoking guix-daemon}). | |
3371 | ||
3372 | @cindex strata of code | |
f97c9175 | 3373 | It should come as no surprise that we like to write these build actions |
21b679f6 LC |
3374 | in Scheme. When we do that, we end up with two @dfn{strata} of Scheme |
3375 | code@footnote{The term @dfn{stratum} in this context was coined by | |
ef4ab0a4 LC |
3376 | Manuel Serrano et al.@: in the context of their work on Hop. Oleg |
3377 | Kiselyov, who has written insightful | |
3378 | @url{http://okmij.org/ftp/meta-programming/#meta-scheme, essays and code | |
3379 | on this topic}, refers to this kind of code generation as | |
3380 | @dfn{staging}.}: the ``host code''---code that defines packages, talks | |
3381 | to the daemon, etc.---and the ``build code''---code that actually | |
3382 | performs build actions, such as making directories, invoking | |
3383 | @command{make}, etc. | |
21b679f6 LC |
3384 | |
3385 | To describe a derivation and its build actions, one typically needs to | |
3386 | embed build code inside host code. It boils down to manipulating build | |
f97c9175 | 3387 | code as data, and the homoiconicity of Scheme---code has a direct |
21b679f6 | 3388 | representation as data---comes in handy for that. But we need more than |
f97c9175 | 3389 | the normal @code{quasiquote} mechanism in Scheme to construct build |
21b679f6 LC |
3390 | expressions. |
3391 | ||
3392 | The @code{(guix gexp)} module implements @dfn{G-expressions}, a form of | |
3393 | S-expressions adapted to build expressions. G-expressions, or | |
f97c9175 | 3394 | @dfn{gexps}, consist essentially of three syntactic forms: @code{gexp}, |
21b679f6 | 3395 | @code{ungexp}, and @code{ungexp-splicing} (or simply: @code{#~}, |
f97c9175 AE |
3396 | @code{#$}, and @code{#$@@}), which are comparable to |
3397 | @code{quasiquote}, @code{unquote}, and @code{unquote-splicing}, | |
3398 | respectivel (@pxref{Expression Syntax, @code{quasiquote},, guile, | |
3399 | GNU Guile Reference Manual}). However, there are major differences: | |
21b679f6 LC |
3400 | |
3401 | @itemize | |
3402 | @item | |
3403 | Gexps are meant to be written to a file and run or manipulated by other | |
3404 | processes. | |
3405 | ||
3406 | @item | |
b39fc6f7 LC |
3407 | When a high-level object such as a package or derivation is unquoted |
3408 | inside a gexp, the result is as if its output file name had been | |
3409 | introduced. | |
ff40e9b7 | 3410 | |
21b679f6 LC |
3411 | @item |
3412 | Gexps carry information about the packages or derivations they refer to, | |
3413 | and these dependencies are automatically added as inputs to the build | |
3414 | processes that use them. | |
3415 | @end itemize | |
3416 | ||
c2b84676 | 3417 | @cindex lowering, of high-level objects in gexps |
343eacbe LC |
3418 | This mechanism is not limited to package and derivation |
3419 | objects: @dfn{compilers} able to ``lower'' other high-level objects to | |
c2b84676 LC |
3420 | derivations or files in the store can be defined, |
3421 | such that these objects can also be inserted | |
f97c9175 | 3422 | into gexps. For example, a useful type of high-level objects that can be |
343eacbe | 3423 | inserted in a gexp is ``file-like objects'', which make it easy to |
f97c9175 | 3424 | add files to the store and to refer to them in |
558e8b11 LC |
3425 | derivations and such (see @code{local-file} and @code{plain-file} |
3426 | below.) | |
b39fc6f7 | 3427 | |
21b679f6 LC |
3428 | To illustrate the idea, here is an example of a gexp: |
3429 | ||
3430 | @example | |
3431 | (define build-exp | |
3432 | #~(begin | |
3433 | (mkdir #$output) | |
3434 | (chdir #$output) | |
aff8ce7c | 3435 | (symlink (string-append #$coreutils "/bin/ls") |
21b679f6 LC |
3436 | "list-files"))) |
3437 | @end example | |
3438 | ||
3439 | This gexp can be passed to @code{gexp->derivation}; we obtain a | |
3440 | derivation that builds a directory containing exactly one symlink to | |
3441 | @file{/gnu/store/@dots{}-coreutils-8.22/bin/ls}: | |
3442 | ||
3443 | @example | |
3444 | (gexp->derivation "the-thing" build-exp) | |
3445 | @end example | |
3446 | ||
e20fd1bf | 3447 | As one would expect, the @code{"/gnu/store/@dots{}-coreutils-8.22"} string is |
21b679f6 LC |
3448 | substituted to the reference to the @var{coreutils} package in the |
3449 | actual build code, and @var{coreutils} is automatically made an input to | |
3450 | the derivation. Likewise, @code{#$output} (equivalent to @code{(ungexp | |
f97c9175 AE |
3451 | output)}) is replaced by a string containing the directory name of the |
3452 | output of the derivation. | |
667b2508 LC |
3453 | |
3454 | @cindex cross compilation | |
3455 | In a cross-compilation context, it is useful to distinguish between | |
3456 | references to the @emph{native} build of a package---that can run on the | |
3457 | host---versus references to cross builds of a package. To that end, the | |
3458 | @code{#+} plays the same role as @code{#$}, but is a reference to a | |
3459 | native package build: | |
3460 | ||
3461 | @example | |
3462 | (gexp->derivation "vi" | |
3463 | #~(begin | |
3464 | (mkdir #$output) | |
3465 | (system* (string-append #+coreutils "/bin/ln") | |
3466 | "-s" | |
3467 | (string-append #$emacs "/bin/emacs") | |
3468 | (string-append #$output "/bin/vi"))) | |
3469 | #:target "mips64el-linux") | |
3470 | @end example | |
3471 | ||
3472 | @noindent | |
3473 | In the example above, the native build of @var{coreutils} is used, so | |
3474 | that @command{ln} can actually run on the host; but then the | |
3475 | cross-compiled build of @var{emacs} is referenced. | |
3476 | ||
3477 | The syntactic form to construct gexps is summarized below. | |
21b679f6 LC |
3478 | |
3479 | @deffn {Scheme Syntax} #~@var{exp} | |
3480 | @deffnx {Scheme Syntax} (gexp @var{exp}) | |
3481 | Return a G-expression containing @var{exp}. @var{exp} may contain one | |
3482 | or more of the following forms: | |
3483 | ||
3484 | @table @code | |
3485 | @item #$@var{obj} | |
3486 | @itemx (ungexp @var{obj}) | |
b39fc6f7 LC |
3487 | Introduce a reference to @var{obj}. @var{obj} may have one of the |
3488 | supported types, for example a package or a | |
21b679f6 LC |
3489 | derivation, in which case the @code{ungexp} form is replaced by its |
3490 | output file name---e.g., @code{"/gnu/store/@dots{}-coreutils-8.22}. | |
3491 | ||
b39fc6f7 LC |
3492 | If @var{obj} is a list, it is traversed and references to supported |
3493 | objects are substituted similarly. | |
21b679f6 LC |
3494 | |
3495 | If @var{obj} is another gexp, its contents are inserted and its | |
3496 | dependencies are added to those of the containing gexp. | |
3497 | ||
3498 | If @var{obj} is another kind of object, it is inserted as is. | |
3499 | ||
b39fc6f7 LC |
3500 | @item #$@var{obj}:@var{output} |
3501 | @itemx (ungexp @var{obj} @var{output}) | |
21b679f6 | 3502 | This is like the form above, but referring explicitly to the |
b39fc6f7 LC |
3503 | @var{output} of @var{obj}---this is useful when @var{obj} produces |
3504 | multiple outputs (@pxref{Packages with Multiple Outputs}). | |
21b679f6 | 3505 | |
667b2508 LC |
3506 | @item #+@var{obj} |
3507 | @itemx #+@var{obj}:output | |
3508 | @itemx (ungexp-native @var{obj}) | |
3509 | @itemx (ungexp-native @var{obj} @var{output}) | |
3510 | Same as @code{ungexp}, but produces a reference to the @emph{native} | |
3511 | build of @var{obj} when used in a cross compilation context. | |
3512 | ||
21b679f6 LC |
3513 | @item #$output[:@var{output}] |
3514 | @itemx (ungexp output [@var{output}]) | |
3515 | Insert a reference to derivation output @var{output}, or to the main | |
3516 | output when @var{output} is omitted. | |
3517 | ||
3518 | This only makes sense for gexps passed to @code{gexp->derivation}. | |
3519 | ||
3520 | @item #$@@@var{lst} | |
3521 | @itemx (ungexp-splicing @var{lst}) | |
3522 | Like the above, but splices the contents of @var{lst} inside the | |
3523 | containing list. | |
3524 | ||
667b2508 LC |
3525 | @item #+@@@var{lst} |
3526 | @itemx (ungexp-native-splicing @var{lst}) | |
3527 | Like the above, but refers to native builds of the objects listed in | |
3528 | @var{lst}. | |
3529 | ||
21b679f6 LC |
3530 | @end table |
3531 | ||
3532 | G-expressions created by @code{gexp} or @code{#~} are run-time objects | |
3533 | of the @code{gexp?} type (see below.) | |
3534 | @end deffn | |
3535 | ||
3536 | @deffn {Scheme Procedure} gexp? @var{obj} | |
3537 | Return @code{#t} if @var{obj} is a G-expression. | |
3538 | @end deffn | |
3539 | ||
3540 | G-expressions are meant to be written to disk, either as code building | |
3541 | some derivation, or as plain files in the store. The monadic procedures | |
3542 | below allow you to do that (@pxref{The Store Monad}, for more | |
3543 | information about monads.) | |
3544 | ||
3545 | @deffn {Monadic Procedure} gexp->derivation @var{name} @var{exp} @ | |
ce45eb4c | 3546 | [#:system (%current-system)] [#:target #f] [#:graft? #t] @ |
21b679f6 LC |
3547 | [#:hash #f] [#:hash-algo #f] @ |
3548 | [#:recursive? #f] [#:env-vars '()] [#:modules '()] @ | |
4684f301 | 3549 | [#:module-path @var{%load-path}] @ |
c8351d9a | 3550 | [#:references-graphs #f] [#:allowed-references #f] @ |
c0468155 | 3551 | [#:leaked-env-vars #f] @ |
0309e1b0 | 3552 | [#:script-name (string-append @var{name} "-builder")] @ |
4a6aeb67 | 3553 | [#:local-build? #f] [#:substitutable? #t] [#:guile-for-build #f] |
21b679f6 | 3554 | Return a derivation @var{name} that runs @var{exp} (a gexp) with |
0309e1b0 LC |
3555 | @var{guile-for-build} (a derivation) on @var{system}; @var{exp} is |
3556 | stored in a file called @var{script-name}. When @var{target} is true, | |
3557 | it is used as the cross-compilation target triplet for packages referred | |
3558 | to by @var{exp}. | |
21b679f6 | 3559 | |
ce45eb4c LC |
3560 | Make @var{modules} available in the evaluation context of @var{exp}; |
3561 | @var{modules} is a list of names of Guile modules searched in | |
3562 | @var{module-path} to be copied in the store, compiled, and made available in | |
21b679f6 LC |
3563 | the load path during the execution of @var{exp}---e.g., @code{((guix |
3564 | build utils) (guix build gnu-build-system))}. | |
3565 | ||
ce45eb4c LC |
3566 | @var{graft?} determines whether packages referred to by @var{exp} should be grafted when |
3567 | applicable. | |
3568 | ||
b53833b2 LC |
3569 | When @var{references-graphs} is true, it must be a list of tuples of one of the |
3570 | following forms: | |
3571 | ||
3572 | @example | |
3573 | (@var{file-name} @var{package}) | |
3574 | (@var{file-name} @var{package} @var{output}) | |
3575 | (@var{file-name} @var{derivation}) | |
3576 | (@var{file-name} @var{derivation} @var{output}) | |
3577 | (@var{file-name} @var{store-item}) | |
3578 | @end example | |
3579 | ||
3580 | The right-hand-side of each element of @var{references-graphs} is automatically made | |
3581 | an input of the build process of @var{exp}. In the build environment, each | |
3582 | @var{file-name} contains the reference graph of the corresponding item, in a simple | |
3583 | text format. | |
3584 | ||
c8351d9a LC |
3585 | @var{allowed-references} must be either @code{#f} or a list of output names and packages. |
3586 | In the latter case, the list denotes store items that the result is allowed to | |
3587 | refer to. Any reference to another store item will lead to a build error. | |
3588 | ||
e20fd1bf | 3589 | The other arguments are as for @code{derivation} (@pxref{Derivations}). |
21b679f6 LC |
3590 | @end deffn |
3591 | ||
343eacbe | 3592 | @cindex file-like objects |
e1c153e0 LC |
3593 | The @code{local-file}, @code{plain-file}, @code{computed-file}, |
3594 | @code{program-file}, and @code{scheme-file} procedures below return | |
3595 | @dfn{file-like objects}. That is, when unquoted in a G-expression, | |
3596 | these objects lead to a file in the store. Consider this G-expression: | |
343eacbe LC |
3597 | |
3598 | @example | |
3599 | #~(system* (string-append #$glibc "/sbin/nscd") "-f" | |
3600 | #$(local-file "/tmp/my-nscd.conf")) | |
3601 | @end example | |
3602 | ||
3603 | The effect here is to ``intern'' @file{/tmp/my-nscd.conf} by copying it | |
3604 | to the store. Once expanded, for instance @i{via} | |
3605 | @code{gexp->derivation}, the G-expression refers to that copy under | |
3606 | @file{/gnu/store}; thus, modifying or removing the file in @file{/tmp} | |
3607 | does not have any effect on what the G-expression does. | |
3608 | @code{plain-file} can be used similarly; it differs in that the file | |
3609 | content is directly passed as a string. | |
3610 | ||
d9ae938f LC |
3611 | @deffn {Scheme Procedure} local-file @var{file} [@var{name}] @ |
3612 | [#:recursive? #t] | |
3613 | Return an object representing local file @var{file} to add to the store; this | |
9d3994f7 LC |
3614 | object can be used in a gexp. If @var{file} is a relative file name, it is looked |
3615 | up relative to the source file where this form appears. @var{file} will be added to | |
3616 | the store under @var{name}--by default the base name of @var{file}. | |
d9ae938f LC |
3617 | |
3618 | When @var{recursive?} is true, the contents of @var{file} are added recursively; if @var{file} | |
3619 | designates a flat file and @var{recursive?} is true, its contents are added, and its | |
3620 | permission bits are kept. | |
3621 | ||
3622 | This is the declarative counterpart of the @code{interned-file} monadic | |
3623 | procedure (@pxref{The Store Monad, @code{interned-file}}). | |
3624 | @end deffn | |
3625 | ||
558e8b11 LC |
3626 | @deffn {Scheme Procedure} plain-file @var{name} @var{content} |
3627 | Return an object representing a text file called @var{name} with the given | |
3628 | @var{content} (a string) to be added to the store. | |
3629 | ||
3630 | This is the declarative counterpart of @code{text-file}. | |
3631 | @end deffn | |
3632 | ||
91937029 LC |
3633 | @deffn {Scheme Procedure} computed-file @var{name} @var{gexp} @ |
3634 | [#:modules '()] [#:options '(#:local-build? #t)] | |
3635 | Return an object representing the store item @var{name}, a file or | |
3636 | directory computed by @var{gexp}. @var{modules} specifies the set of | |
3637 | modules visible in the execution context of @var{gexp}. @var{options} | |
3638 | is a list of additional arguments to pass to @code{gexp->derivation}. | |
3639 | ||
3640 | This is the declarative counterpart of @code{gexp->derivation}. | |
3641 | @end deffn | |
3642 | ||
21b679f6 LC |
3643 | @deffn {Monadic Procedure} gexp->script @var{name} @var{exp} |
3644 | Return an executable script @var{name} that runs @var{exp} using | |
3645 | @var{guile} with @var{modules} in its search path. | |
3646 | ||
3647 | The example below builds a script that simply invokes the @command{ls} | |
3648 | command: | |
3649 | ||
3650 | @example | |
3651 | (use-modules (guix gexp) (gnu packages base)) | |
3652 | ||
3653 | (gexp->script "list-files" | |
3654 | #~(execl (string-append #$coreutils "/bin/ls") | |
3655 | "ls")) | |
3656 | @end example | |
3657 | ||
3658 | When ``running'' it through the store (@pxref{The Store Monad, | |
e20fd1bf | 3659 | @code{run-with-store}}), we obtain a derivation that produces an |
21b679f6 LC |
3660 | executable file @file{/gnu/store/@dots{}-list-files} along these lines: |
3661 | ||
3662 | @example | |
3663 | #!/gnu/store/@dots{}-guile-2.0.11/bin/guile -ds | |
3664 | !# | |
3665 | (execl (string-append "/gnu/store/@dots{}-coreutils-8.22"/bin/ls") | |
3666 | "ls") | |
3667 | @end example | |
3668 | @end deffn | |
3669 | ||
15a01c72 LC |
3670 | @deffn {Scheme Procedure} program-file @var{name} @var{exp} @ |
3671 | [#:modules '()] [#:guile #f] | |
3672 | Return an object representing the executable store item @var{name} that | |
3673 | runs @var{gexp}. @var{guile} is the Guile package used to execute that | |
3674 | script, and @var{modules} is the list of modules visible to that script. | |
3675 | ||
3676 | This is the declarative counterpart of @code{gexp->script}. | |
3677 | @end deffn | |
3678 | ||
21b679f6 LC |
3679 | @deffn {Monadic Procedure} gexp->file @var{name} @var{exp} |
3680 | Return a derivation that builds a file @var{name} containing @var{exp}. | |
3681 | ||
3682 | The resulting file holds references to all the dependencies of @var{exp} | |
3683 | or a subset thereof. | |
3684 | @end deffn | |
1ed19464 | 3685 | |
e1c153e0 LC |
3686 | @deffn {Scheme Procedure} scheme-file @var{name} @var{exp} |
3687 | Return an object representing the Scheme file @var{name} that contains | |
3688 | @var{exp}. | |
3689 | ||
3690 | This is the declarative counterpart of @code{gexp->file}. | |
3691 | @end deffn | |
3692 | ||
1ed19464 LC |
3693 | @deffn {Monadic Procedure} text-file* @var{name} @var{text} @dots{} |
3694 | Return as a monadic value a derivation that builds a text file | |
3695 | containing all of @var{text}. @var{text} may list, in addition to | |
d9ae938f LC |
3696 | strings, objects of any type that can be used in a gexp: packages, |
3697 | derivations, local file objects, etc. The resulting store file holds | |
3698 | references to all these. | |
1ed19464 LC |
3699 | |
3700 | This variant should be preferred over @code{text-file} anytime the file | |
3701 | to create will reference items from the store. This is typically the | |
3702 | case when building a configuration file that embeds store file names, | |
3703 | like this: | |
3704 | ||
3705 | @example | |
3706 | (define (profile.sh) | |
3707 | ;; Return the name of a shell script in the store that | |
3708 | ;; initializes the 'PATH' environment variable. | |
3709 | (text-file* "profile.sh" | |
3710 | "export PATH=" coreutils "/bin:" | |
3711 | grep "/bin:" sed "/bin\n")) | |
3712 | @end example | |
3713 | ||
3714 | In this example, the resulting @file{/gnu/store/@dots{}-profile.sh} file | |
3715 | will references @var{coreutils}, @var{grep}, and @var{sed}, thereby | |
3716 | preventing them from being garbage-collected during its lifetime. | |
3717 | @end deffn | |
21b679f6 | 3718 | |
b751cde3 LC |
3719 | @deffn {Scheme Procedure} mixed-text-file @var{name} @var{text} @dots{} |
3720 | Return an object representing store file @var{name} containing | |
3721 | @var{text}. @var{text} is a sequence of strings and file-like objects, | |
3722 | as in: | |
3723 | ||
3724 | @example | |
3725 | (mixed-text-file "profile" | |
3726 | "export PATH=" coreutils "/bin:" grep "/bin") | |
3727 | @end example | |
3728 | ||
3729 | This is the declarative counterpart of @code{text-file*}. | |
3730 | @end deffn | |
3731 | ||
21b679f6 LC |
3732 | Of course, in addition to gexps embedded in ``host'' code, there are |
3733 | also modules containing build tools. To make it clear that they are | |
3734 | meant to be used in the build stratum, these modules are kept in the | |
3735 | @code{(guix build @dots{})} name space. | |
3736 | ||
c2b84676 LC |
3737 | @cindex lowering, of high-level objects in gexps |
3738 | Internally, high-level objects are @dfn{lowered}, using their compiler, | |
3739 | to either derivations or store items. For instance, lowering a package | |
3740 | yields a derivation, and lowering a @code{plain-file} yields a store | |
3741 | item. This is achieved using the @code{lower-object} monadic procedure. | |
3742 | ||
3743 | @deffn {Monadic Procedure} lower-object @var{obj} [@var{system}] @ | |
3744 | [#:target #f] | |
3745 | Return as a value in @var{%store-monad} the derivation or store item | |
3746 | corresponding to @var{obj} for @var{system}, cross-compiling for | |
3747 | @var{target} if @var{target} is true. @var{obj} must be an object that | |
3748 | has an associated gexp compiler, such as a @code{<package>}. | |
3749 | @end deffn | |
3750 | ||
21b679f6 | 3751 | |
568717fd LC |
3752 | @c ********************************************************************* |
3753 | @node Utilities | |
3754 | @chapter Utilities | |
3755 | ||
210cc920 LC |
3756 | This section describes tools primarily targeted at developers and users |
3757 | who write new package definitions. They complement the Scheme | |
3758 | programming interface of Guix in a convenient way. | |
3759 | ||
568717fd | 3760 | @menu |
37166310 | 3761 | * Invoking guix build:: Building packages from the command line. |
39bee8a2 | 3762 | * Invoking guix edit:: Editing package definitions. |
210cc920 | 3763 | * Invoking guix download:: Downloading a file and printing its hash. |
37166310 | 3764 | * Invoking guix hash:: Computing the cryptographic hash of a file. |
2f7d2d91 | 3765 | * Invoking guix import:: Importing package definitions. |
37166310 | 3766 | * Invoking guix refresh:: Updating package definitions. |
b4f5e0e8 | 3767 | * Invoking guix lint:: Finding errors in package definitions. |
fcc58db6 | 3768 | * Invoking guix size:: Profiling disk usage. |
88856916 | 3769 | * Invoking guix graph:: Visualizing the graph of packages. |
372c4bbc | 3770 | * Invoking guix environment:: Setting up development environments. |
aff8ce7c | 3771 | * Invoking guix publish:: Sharing substitutes. |
d23c20f1 | 3772 | * Invoking guix challenge:: Challenging substitute servers. |
32efa254 | 3773 | * Invoking guix container:: Process isolation. |
568717fd LC |
3774 | @end menu |
3775 | ||
e49951eb MW |
3776 | @node Invoking guix build |
3777 | @section Invoking @command{guix build} | |
568717fd | 3778 | |
e49951eb | 3779 | The @command{guix build} command builds packages or derivations and |
6798a8e4 LC |
3780 | their dependencies, and prints the resulting store paths. Note that it |
3781 | does not modify the user's profile---this is the job of the | |
e49951eb | 3782 | @command{guix package} command (@pxref{Invoking guix package}). Thus, |
6798a8e4 LC |
3783 | it is mainly useful for distribution developers. |
3784 | ||
3785 | The general syntax is: | |
c78bd12b LC |
3786 | |
3787 | @example | |
e49951eb | 3788 | guix build @var{options} @var{package-or-derivation}@dots{} |
c78bd12b LC |
3789 | @end example |
3790 | ||
f97c9175 | 3791 | As an example, the following command builds the latest versions of Emacs |
ccd7158d LC |
3792 | and of Guile, displays their build logs, and finally displays the |
3793 | resulting directories: | |
3794 | ||
3795 | @example | |
3796 | guix build emacs guile | |
3797 | @end example | |
3798 | ||
3799 | Similarly, the following command builds all the available packages: | |
3800 | ||
3801 | @example | |
3802 | guix build --keep-going \ | |
3803 | `guix package -A | cut -f1,2 --output-delimiter=@@` | |
3804 | @end example | |
3805 | ||
c78bd12b | 3806 | @var{package-or-derivation} may be either the name of a package found in |
5401dd75 LC |
3807 | the software distribution such as @code{coreutils} or |
3808 | @code{coreutils-8.20}, or a derivation such as | |
834129e0 | 3809 | @file{/gnu/store/@dots{}-coreutils-8.19.drv}. In the former case, a |
e7f34eb0 LC |
3810 | package with the corresponding name (and optionally version) is searched |
3811 | for among the GNU distribution modules (@pxref{Package Modules}). | |
3812 | ||
3813 | Alternatively, the @code{--expression} option may be used to specify a | |
3814 | Scheme expression that evaluates to a package; this is useful when | |
3815 | disambiguation among several same-named packages or package variants is | |
3816 | needed. | |
c78bd12b | 3817 | |
ccd7158d LC |
3818 | There may be zero or more @var{options}. The available options are |
3819 | described in the subsections below. | |
3820 | ||
3821 | @menu | |
3822 | * Common Build Options:: Build options for most commands. | |
88ad6ded | 3823 | * Package Transformation Options:: Creating variants of packages. |
ccd7158d LC |
3824 | * Additional Build Options:: Options specific to 'guix build'. |
3825 | @end menu | |
3826 | ||
3827 | @node Common Build Options | |
3828 | @subsection Common Build Options | |
3829 | ||
3830 | A number of options that control the build process are common to | |
3831 | @command{guix build} and other commands that can spawn builds, such as | |
3832 | @command{guix package} or @command{guix archive}. These are the | |
3833 | following: | |
3834 | ||
3835 | @table @code | |
3836 | ||
3837 | @item --load-path=@var{directory} | |
3838 | @itemx -L @var{directory} | |
3839 | Add @var{directory} to the front of the package module search path | |
3840 | (@pxref{Package Modules}). | |
3841 | ||
3842 | This allows users to define their own packages and make them visible to | |
3843 | the command-line tools. | |
3844 | ||
3845 | @item --keep-failed | |
3846 | @itemx -K | |
3847 | Keep the build tree of failed builds. Thus, if a build fail, its build | |
3848 | tree is kept under @file{/tmp}, in a directory whose name is shown at | |
3849 | the end of the build log. This is useful when debugging build issues. | |
3850 | ||
3851 | @item --keep-going | |
3852 | @itemx -k | |
3853 | Keep going when some of the derivations fail to build; return only once | |
3854 | all the builds have either completed or failed. | |
3855 | ||
3856 | The default behavior is to stop as soon as one of the specified | |
3857 | derivations has failed. | |
3858 | ||
3859 | @item --dry-run | |
3860 | @itemx -n | |
3861 | Do not build the derivations. | |
3862 | ||
3863 | @item --fallback | |
3864 | When substituting a pre-built binary fails, fall back to building | |
3865 | packages locally. | |
3866 | ||
3867 | @item --substitute-urls=@var{urls} | |
3868 | @anchor{client-substitute-urls} | |
3869 | Consider @var{urls} the whitespace-separated list of substitute source | |
3870 | URLs, overriding the default list of URLs of @command{guix-daemon} | |
3871 | (@pxref{daemon-substitute-urls,, @command{guix-daemon} URLs}). | |
3872 | ||
3873 | This means that substitutes may be downloaded from @var{urls}, provided | |
3874 | they are signed by a key authorized by the system administrator | |
3875 | (@pxref{Substitutes}). | |
3876 | ||
3877 | @item --no-substitutes | |
3878 | Do not use substitutes for build products. That is, always build things | |
3879 | locally instead of allowing downloads of pre-built binaries | |
3880 | (@pxref{Substitutes}). | |
3881 | ||
3882 | @item --rounds=@var{n} | |
3883 | Build each derivation @var{n} times in a row, and raise an error if | |
3884 | consecutive build results are not bit-for-bit identical. | |
3885 | ||
3886 | This is a useful way to detect non-deterministic builds processes. | |
3887 | Non-deterministic build processes are a problem because they make it | |
3888 | practically impossible for users to @emph{verify} whether third-party | |
3889 | binaries are genuine. @xref{Invoking guix challenge}, for more. | |
3890 | ||
3891 | Note that, currently, the differing build results are not kept around, | |
3892 | so you will have to manually investigate in case of an error---e.g., by | |
3893 | stashing one of the build results with @code{guix archive --export}, | |
3894 | then rebuilding, and finally comparing the two results. | |
3895 | ||
3896 | @item --no-build-hook | |
f97c9175 | 3897 | Do not attempt to offload builds @i{via} the ``build hook'' of the daemon |
ccd7158d LC |
3898 | (@pxref{Daemon Offload Setup}). That is, always build things locally |
3899 | instead of offloading builds to remote machines. | |
3900 | ||
3901 | @item --max-silent-time=@var{seconds} | |
3902 | When the build or substitution process remains silent for more than | |
3903 | @var{seconds}, terminate it and report a build failure. | |
3904 | ||
3905 | @item --timeout=@var{seconds} | |
3906 | Likewise, when the build or substitution process lasts for more than | |
3907 | @var{seconds}, terminate it and report a build failure. | |
3908 | ||
3909 | By default there is no timeout. This behavior can be restored with | |
3910 | @code{--timeout=0}. | |
3911 | ||
3912 | @item --verbosity=@var{level} | |
3913 | Use the given verbosity level. @var{level} must be an integer between 0 | |
3914 | and 5; higher means more verbose output. Setting a level of 4 or more | |
3915 | may be helpful when debugging setup issues with the build daemon. | |
3916 | ||
3917 | @item --cores=@var{n} | |
3918 | @itemx -c @var{n} | |
3919 | Allow the use of up to @var{n} CPU cores for the build. The special | |
3920 | value @code{0} means to use as many CPU cores as available. | |
3921 | ||
3922 | @item --max-jobs=@var{n} | |
3923 | @itemx -M @var{n} | |
3924 | Allow at most @var{n} build jobs in parallel. @xref{Invoking | |
3925 | guix-daemon, @code{--max-jobs}}, for details about this option and the | |
3926 | equivalent @command{guix-daemon} option. | |
3927 | ||
3928 | @end table | |
3929 | ||
3930 | Behind the scenes, @command{guix build} is essentially an interface to | |
3931 | the @code{package-derivation} procedure of the @code{(guix packages)} | |
3932 | module, and to the @code{build-derivations} procedure of the @code{(guix | |
3933 | derivations)} module. | |
3934 | ||
3935 | In addition to options explicitly passed on the command line, | |
3936 | @command{guix build} and other @command{guix} commands that support | |
3937 | building honor the @code{GUIX_BUILD_OPTIONS} environment variable. | |
3938 | ||
3939 | @defvr {Environment Variable} GUIX_BUILD_OPTIONS | |
3940 | Users can define this variable to a list of command line options that | |
3941 | will automatically be used by @command{guix build} and other | |
3942 | @command{guix} commands that can perform builds, as in the example | |
3943 | below: | |
3944 | ||
3945 | @example | |
3946 | $ export GUIX_BUILD_OPTIONS="--no-substitutes -c 2 -L /foo/bar" | |
3947 | @end example | |
3948 | ||
3949 | These options are parsed independently, and the result is appended to | |
3950 | the parsed command-line options. | |
3951 | @end defvr | |
3952 | ||
88ad6ded LC |
3953 | |
3954 | @node Package Transformation Options | |
3955 | @subsection Package Transformation Options | |
3956 | ||
3957 | @cindex package variants | |
3958 | Another set of command-line options supported by @command{guix build} | |
b8638f03 | 3959 | and also @command{guix package} are @dfn{package transformation |
f97c9175 | 3960 | options}. These are options that make it possible to define @dfn{package |
b8638f03 LC |
3961 | variants}---for instance, packages built from different source code. |
3962 | This is a convenient way to create customized packages on the fly | |
3963 | without having to type in the definitions of package variants | |
3964 | (@pxref{Defining Packages}). | |
88ad6ded LC |
3965 | |
3966 | @table @code | |
3967 | ||
3968 | @item --with-source=@var{source} | |
3969 | Use @var{source} as the source of the corresponding package. | |
3970 | @var{source} must be a file name or a URL, as for @command{guix | |
3971 | download} (@pxref{Invoking guix download}). | |
3972 | ||
f97c9175 AE |
3973 | The ``corresponding package'' is taken to be the one specified on the |
3974 | command line the name of which matches the base of @var{source}---e.g., | |
3975 | if @var{source} is @code{/src/guile-2.0.10.tar.gz}, the corresponding | |
88ad6ded | 3976 | package is @code{guile}. Likewise, the version string is inferred from |
f97c9175 | 3977 | @var{source}; in the previous example, it is @code{2.0.10}. |
88ad6ded LC |
3978 | |
3979 | This option allows users to try out versions of packages other than the | |
3980 | one provided by the distribution. The example below downloads | |
3981 | @file{ed-1.7.tar.gz} from a GNU mirror and uses that as the source for | |
3982 | the @code{ed} package: | |
3983 | ||
3984 | @example | |
3985 | guix build ed --with-source=mirror://gnu/ed/ed-1.7.tar.gz | |
3986 | @end example | |
3987 | ||
3988 | As a developer, @code{--with-source} makes it easy to test release | |
3989 | candidates: | |
3990 | ||
3991 | @example | |
3992 | guix build guile --with-source=../guile-2.0.9.219-e1bb7.tar.xz | |
3993 | @end example | |
3994 | ||
3995 | @dots{} or to build from a checkout in a pristine environment: | |
3996 | ||
3997 | @example | |
3998 | $ git clone git://git.sv.gnu.org/guix.git | |
3999 | $ guix build guix --with-source=./guix | |
4000 | @end example | |
4001 | ||
47c0f92c LC |
4002 | @item --with-input=@var{package}=@var{replacement} |
4003 | Replace dependency on @var{package} by a dependency on | |
4004 | @var{replacement}. @var{package} must be a package name, and | |
4005 | @var{replacement} must be a package specification such as @code{guile} | |
4006 | or @code{guile@@1.8}. | |
4007 | ||
f97c9175 | 4008 | For instance, the following command builds Guix, but replaces its |
47c0f92c LC |
4009 | dependency on the current stable version of Guile with a dependency on |
4010 | the development version of Guile, @code{guile-next}: | |
4011 | ||
4012 | @example | |
4013 | guix build --with-input=guile=guile-next guix | |
4014 | @end example | |
4015 | ||
4016 | This is a recursive, deep replacement. So in this example, both | |
4017 | @code{guix} and its dependency @code{guile-json} (which also depends on | |
4018 | @code{guile}) get rebuilt against @code{guile-next}. | |
4019 | ||
4020 | However, implicit inputs are left unchanged. | |
88ad6ded LC |
4021 | @end table |
4022 | ||
ccd7158d LC |
4023 | @node Additional Build Options |
4024 | @subsection Additional Build Options | |
4025 | ||
4026 | The command-line options presented below are specific to @command{guix | |
4027 | build}. | |
c78bd12b LC |
4028 | |
4029 | @table @code | |
4030 | ||
34a1783f DT |
4031 | @item --file=@var{file} |
4032 | @itemx -f @var{file} | |
4033 | ||
4034 | Build the package or derivation that the code within @var{file} | |
4035 | evaluates to. | |
4036 | ||
4037 | As an example, @var{file} might contain a package definition like this | |
4038 | (@pxref{Defining Packages}): | |
4039 | ||
4040 | @example | |
4041 | @verbatiminclude package-hello.scm | |
4042 | @end example | |
4043 | ||
c78bd12b LC |
4044 | @item --expression=@var{expr} |
4045 | @itemx -e @var{expr} | |
ac5de156 | 4046 | Build the package or derivation @var{expr} evaluates to. |
c78bd12b | 4047 | |
5401dd75 | 4048 | For example, @var{expr} may be @code{(@@ (gnu packages guile) |
c78bd12b LC |
4049 | guile-1.8)}, which unambiguously designates this specific variant of |
4050 | version 1.8 of Guile. | |
4051 | ||
f97c9175 | 4052 | Alternatively, @var{expr} may be a G-expression, in which case it is used |
56b82106 LC |
4053 | as a build program passed to @code{gexp->derivation} |
4054 | (@pxref{G-Expressions}). | |
4055 | ||
4056 | Lastly, @var{expr} may refer to a zero-argument monadic procedure | |
ac5de156 LC |
4057 | (@pxref{The Store Monad}). The procedure must return a derivation as a |
4058 | monadic value, which is then passed through @code{run-with-store}. | |
4059 | ||
c78bd12b LC |
4060 | @item --source |
4061 | @itemx -S | |
f97c9175 | 4062 | Build the source derivations of the packages, rather than the packages |
c78bd12b LC |
4063 | themselves. |
4064 | ||
e49951eb | 4065 | For instance, @code{guix build -S gcc} returns something like |
f97c9175 AE |
4066 | @file{/gnu/store/@dots{}-gcc-4.7.2.tar.bz2}, which is the GCC |
4067 | source tarball. | |
c78bd12b | 4068 | |
f9cc8971 | 4069 | The returned source tarball is the result of applying any patches and |
f97c9175 | 4070 | code snippets specified in the package @code{origin} (@pxref{Defining |
f9cc8971 LC |
4071 | Packages}). |
4072 | ||
2cdfe13d EB |
4073 | @item --sources |
4074 | Fetch and return the source of @var{package-or-derivation} and all their | |
4075 | dependencies, recursively. This is a handy way to obtain a local copy | |
4076 | of all the source code needed to build @var{packages}, allowing you to | |
4077 | eventually build them even without network access. It is an extension | |
4078 | of the @code{--source} option and can accept one of the following | |
4079 | optional argument values: | |
4080 | ||
4081 | @table @code | |
4082 | @item package | |
4083 | This value causes the @code{--sources} option to behave in the same way | |
4084 | as the @code{--source} option. | |
4085 | ||
4086 | @item all | |
f97c9175 AE |
4087 | Build the source derivations of all packages, including any source that |
4088 | might be listed as @code{inputs}. This is the default value. | |
2cdfe13d EB |
4089 | |
4090 | @example | |
4091 | $ guix build --sources tzdata | |
4092 | The following derivations will be built: | |
4093 | /gnu/store/@dots{}-tzdata2015b.tar.gz.drv | |
4094 | /gnu/store/@dots{}-tzcode2015b.tar.gz.drv | |
4095 | @end example | |
4096 | ||
4097 | @item transitive | |
f97c9175 AE |
4098 | Build the source derivations of all packages, as well of all transitive |
4099 | inputs to the packages. This can be used e.g. to | |
2cdfe13d EB |
4100 | prefetch package source for later offline building. |
4101 | ||
4102 | @example | |
4103 | $ guix build --sources=transitive tzdata | |
4104 | The following derivations will be built: | |
4105 | /gnu/store/@dots{}-tzcode2015b.tar.gz.drv | |
4106 | /gnu/store/@dots{}-findutils-4.4.2.tar.xz.drv | |
4107 | /gnu/store/@dots{}-grep-2.21.tar.xz.drv | |
4108 | /gnu/store/@dots{}-coreutils-8.23.tar.xz.drv | |
4109 | /gnu/store/@dots{}-make-4.1.tar.xz.drv | |
4110 | /gnu/store/@dots{}-bash-4.3.tar.xz.drv | |
4111 | @dots{} | |
4112 | @end example | |
4113 | ||
4114 | @end table | |
4115 | ||
c78bd12b LC |
4116 | @item --system=@var{system} |
4117 | @itemx -s @var{system} | |
4118 | Attempt to build for @var{system}---e.g., @code{i686-linux}---instead of | |
f97c9175 | 4119 | the system type of the build host. |
c78bd12b LC |
4120 | |
4121 | An example use of this is on Linux-based systems, which can emulate | |
4122 | different personalities. For instance, passing | |
4123 | @code{--system=i686-linux} on an @code{x86_64-linux} system allows users | |
4124 | to build packages in a complete 32-bit environment. | |
4125 | ||
e55ec43d LC |
4126 | @item --target=@var{triplet} |
4127 | @cindex cross-compilation | |
4128 | Cross-build for @var{triplet}, which must be a valid GNU triplet, such | |
4129 | as @code{"mips64el-linux-gnu"} (@pxref{Configuration Names, GNU | |
4130 | configuration triplets,, configure, GNU Configure and Build System}). | |
4131 | ||
a8d65643 LC |
4132 | @anchor{build-check} |
4133 | @item --check | |
4134 | @cindex determinism, checking | |
4135 | @cindex reproducibility, checking | |
4136 | Rebuild @var{package-or-derivation}, which are already available in the | |
4137 | store, and raise an error if the build results are not bit-for-bit | |
4138 | identical. | |
4139 | ||
f97c9175 AE |
4140 | This mechanism allows you to check whether previously installed |
4141 | substitutes are genuine (@pxref{Substitutes}), or whether the build result | |
4142 | of a package is deterministic. @xref{Invoking guix challenge}, for more | |
a8d65643 LC |
4143 | background information and tools. |
4144 | ||
05962f29 LC |
4145 | @item --no-grafts |
4146 | Do not ``graft'' packages. In practice, this means that package updates | |
4147 | available as grafts are not applied. @xref{Security Updates}, for more | |
4148 | information on grafts. | |
7f3673f2 | 4149 | |
c78bd12b LC |
4150 | @item --derivations |
4151 | @itemx -d | |
4152 | Return the derivation paths, not the output paths, of the given | |
4153 | packages. | |
4154 | ||
70ee5642 LC |
4155 | @item --root=@var{file} |
4156 | @itemx -r @var{file} | |
4157 | Make @var{file} a symlink to the result, and register it as a garbage | |
4158 | collector root. | |
4159 | ||
4160 | @item --log-file | |
3f208ad7 | 4161 | Return the build log file names or URLs for the given |
f97c9175 | 4162 | @var{package-or-derivation}, or raise an error if build logs are |
70ee5642 LC |
4163 | missing. |
4164 | ||
4165 | This works regardless of how packages or derivations are specified. For | |
4166 | instance, the following invocations are equivalent: | |
4167 | ||
4168 | @example | |
4169 | guix build --log-file `guix build -d guile` | |
4170 | guix build --log-file `guix build guile` | |
4171 | guix build --log-file guile | |
4172 | guix build --log-file -e '(@@ (gnu packages guile) guile-2.0)' | |
4173 | @end example | |
4174 | ||
3f208ad7 LC |
4175 | If a log is unavailable locally, and unless @code{--no-substitutes} is |
4176 | passed, the command looks for a corresponding log on one of the | |
4177 | substitute servers (as specified with @code{--substitute-urls}.) | |
70ee5642 | 4178 | |
f97c9175 AE |
4179 | So for instance, imagine you want to see the build log of GDB on MIPS, |
4180 | but you are actually on an @code{x86_64} machine: | |
3f208ad7 LC |
4181 | |
4182 | @example | |
4183 | $ guix build --log-file gdb -s mips64el-linux | |
4184 | http://hydra.gnu.org/log/@dots{}-gdb-7.10 | |
4185 | @end example | |
4186 | ||
4187 | You can freely access a huge library of build logs! | |
70ee5642 LC |
4188 | @end table |
4189 | ||
16eb115e | 4190 | |
39bee8a2 LC |
4191 | @node Invoking guix edit |
4192 | @section Invoking @command{guix edit} | |
4193 | ||
4194 | @cindex package definition, editing | |
4195 | So many packages, so many source files! The @command{guix edit} command | |
4196 | facilitates the life of packagers by pointing their editor at the source | |
4197 | file containing the definition of the specified packages. For instance: | |
4198 | ||
4199 | @example | |
4200 | guix edit gcc-4.8 vim | |
4201 | @end example | |
4202 | ||
4203 | @noindent | |
6237b9fa LC |
4204 | launches the program specified in the @code{VISUAL} or in the |
4205 | @code{EDITOR} environment variable to edit the recipe of GCC@tie{}4.8.4 | |
4206 | and that of Vim. | |
39bee8a2 | 4207 | |
f97c9175 | 4208 | If you are using Emacs, note that the Emacs user interface provides the |
7c1b1ae2 | 4209 | @kbd{M-x guix-edit} command and a similar functionality in the ``package |
f97c9175 | 4210 | info'' and ``package list'' buffers created by the @kbd{M-x |
7c1b1ae2 | 4211 | guix-search-by-name} and similar commands (@pxref{Emacs Commands}). |
39bee8a2 LC |
4212 | |
4213 | ||
210cc920 LC |
4214 | @node Invoking guix download |
4215 | @section Invoking @command{guix download} | |
4216 | ||
4217 | When writing a package definition, developers typically need to download | |
f97c9175 | 4218 | a source tarball, compute its SHA256 hash, and write that |
210cc920 LC |
4219 | hash in the package definition (@pxref{Defining Packages}). The |
4220 | @command{guix download} tool helps with this task: it downloads a file | |
4221 | from the given URI, adds it to the store, and prints both its file name | |
4222 | in the store and its SHA256 hash. | |
4223 | ||
4224 | The fact that the downloaded file is added to the store saves bandwidth: | |
4225 | when the developer eventually tries to build the newly defined package | |
4226 | with @command{guix build}, the source tarball will not have to be | |
4227 | downloaded again because it is already in the store. It is also a | |
4228 | convenient way to temporarily stash files, which may be deleted | |
4229 | eventually (@pxref{Invoking guix gc}). | |
4230 | ||
4231 | The @command{guix download} command supports the same URIs as used in | |
4232 | package definitions. In particular, it supports @code{mirror://} URIs. | |
4233 | @code{https} URIs (HTTP over TLS) are supported @emph{provided} the | |
4234 | Guile bindings for GnuTLS are available in the user's environment; when | |
537c8bb3 LC |
4235 | they are not available, an error is raised. @xref{Guile Preparations, |
4236 | how to install the GnuTLS bindings for Guile,, gnutls-guile, | |
4237 | GnuTLS-Guile}, for more information. | |
210cc920 LC |
4238 | |
4239 | The following option is available: | |
4240 | ||
4241 | @table @code | |
4242 | @item --format=@var{fmt} | |
4243 | @itemx -f @var{fmt} | |
4244 | Write the hash in the format specified by @var{fmt}. For more | |
081145cf | 4245 | information on the valid values for @var{fmt}, @pxref{Invoking guix hash}. |
210cc920 LC |
4246 | @end table |
4247 | ||
6c365eca NK |
4248 | @node Invoking guix hash |
4249 | @section Invoking @command{guix hash} | |
4250 | ||
210cc920 | 4251 | The @command{guix hash} command computes the SHA256 hash of a file. |
6c365eca NK |
4252 | It is primarily a convenience tool for anyone contributing to the |
4253 | distribution: it computes the cryptographic hash of a file, which can be | |
4254 | used in the definition of a package (@pxref{Defining Packages}). | |
4255 | ||
4256 | The general syntax is: | |
4257 | ||
4258 | @example | |
4259 | guix hash @var{option} @var{file} | |
4260 | @end example | |
4261 | ||
4262 | @command{guix hash} has the following option: | |
4263 | ||
4264 | @table @code | |
4265 | ||
4266 | @item --format=@var{fmt} | |
4267 | @itemx -f @var{fmt} | |
210cc920 | 4268 | Write the hash in the format specified by @var{fmt}. |
6c365eca NK |
4269 | |
4270 | Supported formats: @code{nix-base32}, @code{base32}, @code{base16} | |
4271 | (@code{hex} and @code{hexadecimal} can be used as well). | |
4272 | ||
4273 | If the @option{--format} option is not specified, @command{guix hash} | |
4274 | will output the hash in @code{nix-base32}. This representation is used | |
4275 | in the definitions of packages. | |
4276 | ||
3140f2df LC |
4277 | @item --recursive |
4278 | @itemx -r | |
4279 | Compute the hash on @var{file} recursively. | |
4280 | ||
4281 | In this case, the hash is computed on an archive containing @var{file}, | |
f97c9175 AE |
4282 | including its children if it is a directory. Some of the metadata of |
4283 | @var{file} is part of the archive; for instance, when @var{file} is a | |
3140f2df | 4284 | regular file, the hash is different depending on whether @var{file} is |
f97c9175 | 4285 | executable or not. Metadata such as time stamps has no impact on the |
3140f2df LC |
4286 | hash (@pxref{Invoking guix archive}). |
4287 | @c FIXME: Replace xref above with xref to an ``Archive'' section when | |
4288 | @c it exists. | |
4289 | ||
6c365eca NK |
4290 | @end table |
4291 | ||
2f7d2d91 LC |
4292 | @node Invoking guix import |
4293 | @section Invoking @command{guix import} | |
4294 | ||
4295 | @cindex importing packages | |
4296 | @cindex package import | |
4297 | @cindex package conversion | |
f97c9175 AE |
4298 | The @command{guix import} command is useful for people who would like to |
4299 | add a package to the distribution with as little work as | |
4300 | possible---a legitimate demand. The command knows of a few | |
4301 | repositories from which it can ``import'' package metadata. The result | |
2f7d2d91 LC |
4302 | is a package definition, or a template thereof, in the format we know |
4303 | (@pxref{Defining Packages}). | |
4304 | ||
4305 | The general syntax is: | |
4306 | ||
4307 | @example | |
4308 | guix import @var{importer} @var{options}@dots{} | |
4309 | @end example | |
4310 | ||
4311 | @var{importer} specifies the source from which to import package | |
f97c9175 | 4312 | metadata, and @var{options} specifies a package identifier and other |
2f7d2d91 LC |
4313 | options specific to @var{importer}. Currently, the available |
4314 | ``importers'' are: | |
4315 | ||
4316 | @table @code | |
4317 | @item gnu | |
f97c9175 | 4318 | Import metadata for the given GNU package. This provides a template |
2f7d2d91 LC |
4319 | for the latest version of that GNU package, including the hash of its |
4320 | source tarball, and its canonical synopsis and description. | |
4321 | ||
f97c9175 | 4322 | Additional information such as the package dependencies and its |
2f7d2d91 LC |
4323 | license needs to be figured out manually. |
4324 | ||
4325 | For example, the following command returns a package definition for | |
4326 | GNU@tie{}Hello: | |
4327 | ||
4328 | @example | |
4329 | guix import gnu hello | |
4330 | @end example | |
4331 | ||
4332 | Specific command-line options are: | |
4333 | ||
4334 | @table @code | |
4335 | @item --key-download=@var{policy} | |
4336 | As for @code{guix refresh}, specify the policy to handle missing OpenPGP | |
f97c9175 | 4337 | keys when verifying the package signature. @xref{Invoking guix |
2f7d2d91 LC |
4338 | refresh, @code{--key-download}}. |
4339 | @end table | |
4340 | ||
4341 | @item pypi | |
4342 | @cindex pypi | |
f97c9175 | 4343 | Import metadata from the @uref{https://pypi.python.org/, Python Package |
2f7d2d91 LC |
4344 | Index}@footnote{This functionality requires Guile-JSON to be installed. |
4345 | @xref{Requirements}.}. Information is taken from the JSON-formatted | |
4346 | description available at @code{pypi.python.org} and usually includes all | |
4347 | the relevant information, including package dependencies. | |
4348 | ||
f97c9175 | 4349 | The command below imports metadata for the @code{itsdangerous} Python |
2f7d2d91 LC |
4350 | package: |
4351 | ||
4352 | @example | |
4353 | guix import pypi itsdangerous | |
4354 | @end example | |
4355 | ||
3aae8145 DT |
4356 | @item gem |
4357 | @cindex gem | |
f97c9175 | 4358 | Import metadata from @uref{https://rubygems.org/, |
3aae8145 DT |
4359 | RubyGems}@footnote{This functionality requires Guile-JSON to be |
4360 | installed. @xref{Requirements}.}. Information is taken from the | |
4361 | JSON-formatted description available at @code{rubygems.org} and includes | |
4362 | most relevant information, including runtime dependencies. There are | |
f97c9175 | 4363 | some caveats, however. The metadata doesn't distinguish between |
3aae8145 DT |
4364 | synopses and descriptions, so the same string is used for both fields. |
4365 | Additionally, the details of non-Ruby dependencies required to build | |
4366 | native extensions is unavailable and left as an exercise to the | |
4367 | packager. | |
4368 | ||
f97c9175 | 4369 | The command below imports metadata for the @code{rails} Ruby package: |
3aae8145 DT |
4370 | |
4371 | @example | |
4372 | guix import gem rails | |
4373 | @end example | |
4374 | ||
d45dc6da EB |
4375 | @item cpan |
4376 | @cindex CPAN | |
3c192e4e AE |
4377 | Import metadata from @uref{https://www.metacpan.org/, MetaCPAN}@footnote{This |
4378 | functionality requires Guile-JSON to be installed. | |
4379 | @xref{Requirements}.}. | |
f97c9175 | 4380 | Information is taken from the JSON-formatted metadata provided through |
d45dc6da | 4381 | @uref{https://api.metacpan.org/, MetaCPAN's API} and includes most |
66392e47 EB |
4382 | relevant information, such as module dependencies. License information |
4383 | should be checked closely. If Perl is available in the store, then the | |
4384 | @code{corelist} utility will be used to filter core modules out of the | |
4385 | list of dependencies. | |
d45dc6da | 4386 | |
f97c9175 | 4387 | The command command below imports metadata for the @code{Acme::Boolean} |
d45dc6da EB |
4388 | Perl module: |
4389 | ||
4390 | @example | |
4391 | guix import cpan Acme::Boolean | |
4392 | @end example | |
4393 | ||
e1248602 RW |
4394 | @item cran |
4395 | @cindex CRAN | |
d0bd632f | 4396 | @cindex Bioconductor |
f97c9175 | 4397 | Import metadata from @uref{http://cran.r-project.org/, CRAN}, the |
e1248602 RW |
4398 | central repository for the @uref{http://r-project.org, GNU@tie{}R |
4399 | statistical and graphical environment}. | |
4400 | ||
f97c9175 | 4401 | Information is extracted from the @code{DESCRIPTION} file of the package. |
e1248602 | 4402 | |
f97c9175 | 4403 | The command command below imports metadata for the @code{Cairo} |
e1248602 RW |
4404 | R package: |
4405 | ||
4406 | @example | |
4407 | guix import cran Cairo | |
4408 | @end example | |
4409 | ||
f97c9175 | 4410 | When @code{--archive=bioconductor} is added, metadata is imported from |
d0bd632f RW |
4411 | @uref{http://www.bioconductor.org/, Bioconductor}, a repository of R |
4412 | packages for for the analysis and comprehension of high-throughput | |
4413 | genomic data in bioinformatics. | |
4414 | ||
f97c9175 | 4415 | Information is extracted from the @code{DESCRIPTION} file of a package |
d0bd632f RW |
4416 | published on the web interface of the Bioconductor SVN repository. |
4417 | ||
f97c9175 | 4418 | The command below imports metadata for the @code{GenomicRanges} |
d0bd632f RW |
4419 | R package: |
4420 | ||
4421 | @example | |
4422 | guix import cran --archive=bioconductor GenomicRanges | |
4423 | @end example | |
4424 | ||
2f7d2d91 | 4425 | @item nix |
f97c9175 | 4426 | Import metadata from a local copy of the source of the |
2f7d2d91 LC |
4427 | @uref{http://nixos.org/nixpkgs/, Nixpkgs distribution}@footnote{This |
4428 | relies on the @command{nix-instantiate} command of | |
4429 | @uref{http://nixos.org/nix/, Nix}.}. Package definitions in Nixpkgs are | |
4430 | typically written in a mixture of Nix-language and Bash code. This | |
4431 | command only imports the high-level package structure that is written in | |
4432 | the Nix language. It normally includes all the basic fields of a | |
4433 | package definition. | |
4434 | ||
4435 | When importing a GNU package, the synopsis and descriptions are replaced | |
4436 | by their canonical upstream variant. | |
4437 | ||
961d0d2d LC |
4438 | Usually, you will first need to do: |
4439 | ||
4440 | @example | |
4441 | export NIX_REMOTE=daemon | |
4442 | @end example | |
4443 | ||
4444 | @noindent | |
4445 | so that @command{nix-instantiate} does not try to open the Nix database. | |
4446 | ||
2f7d2d91 LC |
4447 | As an example, the command below imports the package definition of |
4448 | LibreOffice (more precisely, it imports the definition of the package | |
4449 | bound to the @code{libreoffice} top-level attribute): | |
4450 | ||
4451 | @example | |
4452 | guix import nix ~/path/to/nixpkgs libreoffice | |
4453 | @end example | |
863af4e1 FB |
4454 | |
4455 | @item hackage | |
4456 | @cindex hackage | |
f97c9175 | 4457 | Import metadata from the Haskell community's central package archive |
863af4e1 FB |
4458 | @uref{https://hackage.haskell.org/, Hackage}. Information is taken from |
4459 | Cabal files and includes all the relevant information, including package | |
4460 | dependencies. | |
4461 | ||
4462 | Specific command-line options are: | |
4463 | ||
4464 | @table @code | |
a4154748 FB |
4465 | @item --stdin |
4466 | @itemx -s | |
f97c9175 | 4467 | Read a Cabal file from standard input. |
863af4e1 FB |
4468 | @item --no-test-dependencies |
4469 | @itemx -t | |
f97c9175 | 4470 | Do not include dependencies required only by the test suites. |
a4154748 FB |
4471 | @item --cabal-environment=@var{alist} |
4472 | @itemx -e @var{alist} | |
4473 | @var{alist} is a Scheme alist defining the environment in which the | |
4474 | Cabal conditionals are evaluated. The accepted keys are: @code{os}, | |
4475 | @code{arch}, @code{impl} and a string representing the name of a flag. | |
4476 | The value associated with a flag has to be either the symbol | |
4477 | @code{true} or @code{false}. The value associated with other keys | |
4478 | has to conform to the Cabal file format definition. The default value | |
4479 | associated with the keys @code{os}, @code{arch} and @code{impl} is | |
f97c9175 | 4480 | @samp{linux}, @samp{x86_64} and @samp{ghc}, respectively. |
863af4e1 FB |
4481 | @end table |
4482 | ||
f97c9175 | 4483 | The command below imports metadata for the latest version of the |
a4154748 FB |
4484 | @code{HTTP} Haskell package without including test dependencies and |
4485 | specifying the value of the flag @samp{network-uri} as @code{false}: | |
863af4e1 FB |
4486 | |
4487 | @example | |
a4154748 | 4488 | guix import hackage -t -e "'((\"network-uri\" . false))" HTTP |
863af4e1 FB |
4489 | @end example |
4490 | ||
4491 | A specific package version may optionally be specified by following the | |
4492 | package name by a hyphen and a version number as in the following example: | |
4493 | ||
4494 | @example | |
4495 | guix import hackage mtl-2.1.3.1 | |
4496 | @end example | |
7f74a931 FB |
4497 | |
4498 | @item elpa | |
4499 | @cindex elpa | |
f97c9175 | 4500 | Import metadata from an Emacs Lisp Package Archive (ELPA) package |
7f74a931 FB |
4501 | repository (@pxref{Packages,,, emacs, The GNU Emacs Manual}). |
4502 | ||
4503 | Specific command-line options are: | |
4504 | ||
4505 | @table @code | |
4506 | @item --archive=@var{repo} | |
4507 | @itemx -a @var{repo} | |
4508 | @var{repo} identifies the archive repository from which to retrieve the | |
4509 | information. Currently the supported repositories and their identifiers | |
4510 | are: | |
4511 | @itemize - | |
4512 | @item | |
840bd1d3 | 4513 | @uref{http://elpa.gnu.org/packages, GNU}, selected by the @code{gnu} |
7f74a931 FB |
4514 | identifier. This is the default. |
4515 | ||
4516 | @item | |
840bd1d3 | 4517 | @uref{http://stable.melpa.org/packages, MELPA-Stable}, selected by the |
7f74a931 FB |
4518 | @code{melpa-stable} identifier. |
4519 | ||
4520 | @item | |
840bd1d3 | 4521 | @uref{http://melpa.org/packages, MELPA}, selected by the @code{melpa} |
7f74a931 FB |
4522 | identifier. |
4523 | @end itemize | |
4524 | @end table | |
2f7d2d91 LC |
4525 | @end table |
4526 | ||
4527 | The structure of the @command{guix import} code is modular. It would be | |
4528 | useful to have more importers for other package formats, and your help | |
4529 | is welcome here (@pxref{Contributing}). | |
4530 | ||
37166310 LC |
4531 | @node Invoking guix refresh |
4532 | @section Invoking @command{guix refresh} | |
4533 | ||
4534 | The primary audience of the @command{guix refresh} command is developers | |
4535 | of the GNU software distribution. By default, it reports any packages | |
4536 | provided by the distribution that are outdated compared to the latest | |
4537 | upstream version, like this: | |
4538 | ||
4539 | @example | |
4540 | $ guix refresh | |
4541 | gnu/packages/gettext.scm:29:13: gettext would be upgraded from 0.18.1.1 to 0.18.2.1 | |
4542 | gnu/packages/glib.scm:77:12: glib would be upgraded from 2.34.3 to 2.37.0 | |
4543 | @end example | |
4544 | ||
f97c9175 AE |
4545 | It does so by browsing the FTP directory of each package and determining |
4546 | the highest version number of the source tarballs therein. The command | |
bcb571cb LC |
4547 | knows how to update specific types of packages: GNU packages, ELPA |
4548 | packages, etc.---see the documentation for @option{--type} below. The | |
4549 | are many packages, though, for which it lacks a method to determine | |
4550 | whether a new upstream release is available. However, the mechanism is | |
4551 | extensible, so feel free to get in touch with us to add a new method! | |
37166310 LC |
4552 | |
4553 | When passed @code{--update}, it modifies distribution source files to | |
f97c9175 | 4554 | update the version numbers and source tarball hashes of those package |
37166310 LC |
4555 | recipes (@pxref{Defining Packages}). This is achieved by downloading |
4556 | each package's latest source tarball and its associated OpenPGP | |
4557 | signature, authenticating the downloaded tarball against its signature | |
4558 | using @command{gpg}, and finally computing its hash. When the public | |
4559 | key used to sign the tarball is missing from the user's keyring, an | |
4560 | attempt is made to automatically retrieve it from a public key server; | |
f97c9175 | 4561 | when this is successful, the key is added to the user's keyring; otherwise, |
37166310 LC |
4562 | @command{guix refresh} reports an error. |
4563 | ||
4564 | The following options are supported: | |
4565 | ||
4566 | @table @code | |
4567 | ||
2d7fc7da LC |
4568 | @item --expression=@var{expr} |
4569 | @itemx -e @var{expr} | |
4570 | Consider the package @var{expr} evaluates to. | |
4571 | ||
4572 | This is useful to precisely refer to a package, as in this example: | |
4573 | ||
4574 | @example | |
4575 | guix refresh -l -e '(@@@@ (gnu packages commencement) glibc-final)' | |
4576 | @end example | |
4577 | ||
4578 | This command lists the dependents of the ``final'' libc (essentially all | |
4579 | the packages.) | |
4580 | ||
37166310 LC |
4581 | @item --update |
4582 | @itemx -u | |
38e16b49 LC |
4583 | Update distribution source files (package recipes) in place. This is |
4584 | usually run from a checkout of the Guix source tree (@pxref{Running | |
4585 | Guix Before It Is Installed}): | |
4586 | ||
4587 | @example | |
4588 | $ ./pre-inst-env guix refresh -s non-core | |
4589 | @end example | |
4590 | ||
081145cf | 4591 | @xref{Defining Packages}, for more information on package definitions. |
37166310 LC |
4592 | |
4593 | @item --select=[@var{subset}] | |
4594 | @itemx -s @var{subset} | |
4595 | Select all the packages in @var{subset}, one of @code{core} or | |
4596 | @code{non-core}. | |
4597 | ||
4598 | The @code{core} subset refers to all the packages at the core of the | |
4599 | distribution---i.e., packages that are used to build ``everything | |
4600 | else''. This includes GCC, libc, Binutils, Bash, etc. Usually, | |
4601 | changing one of these packages in the distribution entails a rebuild of | |
4602 | all the others. Thus, such updates are an inconvenience to users in | |
4603 | terms of build time or bandwidth used to achieve the upgrade. | |
4604 | ||
4605 | The @code{non-core} subset refers to the remaining packages. It is | |
4606 | typically useful in cases where an update of the core packages would be | |
4607 | inconvenient. | |
4608 | ||
bcb571cb LC |
4609 | @item --type=@var{updater} |
4610 | @itemx -t @var{updater} | |
7191adc5 AK |
4611 | Select only packages handled by @var{updater} (may be a comma-separated |
4612 | list of updaters). Currently, @var{updater} may be one of: | |
bcb571cb LC |
4613 | |
4614 | @table @code | |
4615 | @item gnu | |
4616 | the updater for GNU packages; | |
e80c0f85 LC |
4617 | @item gnome |
4618 | the updater for GNOME packages; | |
bcb571cb | 4619 | @item elpa |
d882c235 LC |
4620 | the updater for @uref{http://elpa.gnu.org/, ELPA} packages; |
4621 | @item cran | |
b9d044ef | 4622 | the updater for @uref{http://cran.r-project.org/, CRAN} packages; |
d0bd632f RW |
4623 | @item bioconductor |
4624 | the updater for @uref{http://www.bioconductor.org/, Bioconductor} R packages; | |
bab020d7 | 4625 | @item pypi |
b9d044ef | 4626 | the updater for @uref{https://pypi.python.org, PyPI} packages. |
fbc5b815 BW |
4627 | @item gem |
4628 | the updater for @uref{https://rubygems.org, RubyGems} packages. | |
bcb571cb LC |
4629 | @end table |
4630 | ||
f97c9175 AE |
4631 | For instance, the following command only checks for updates of Emacs |
4632 | packages hosted at @code{elpa.gnu.org} and for updates of CRAN packages: | |
bcb571cb LC |
4633 | |
4634 | @example | |
7191adc5 | 4635 | $ guix refresh --type=elpa,cran |
d882c235 | 4636 | gnu/packages/statistics.scm:819:13: r-testthat would be upgraded from 0.10.0 to 0.11.0 |
bcb571cb LC |
4637 | gnu/packages/emacs.scm:856:13: emacs-auctex would be upgraded from 11.88.6 to 11.88.9 |
4638 | @end example | |
4639 | ||
37166310 LC |
4640 | @end table |
4641 | ||
4642 | In addition, @command{guix refresh} can be passed one or more package | |
4643 | names, as in this example: | |
4644 | ||
4645 | @example | |
38e16b49 | 4646 | $ ./pre-inst-env guix refresh -u emacs idutils gcc-4.8.4 |
37166310 LC |
4647 | @end example |
4648 | ||
4649 | @noindent | |
4650 | The command above specifically updates the @code{emacs} and | |
4651 | @code{idutils} packages. The @code{--select} option would have no | |
4652 | effect in this case. | |
4653 | ||
7d193ec3 EB |
4654 | When considering whether to upgrade a package, it is sometimes |
4655 | convenient to know which packages would be affected by the upgrade and | |
4656 | should be checked for compatibility. For this the following option may | |
4657 | be used when passing @command{guix refresh} one or more package names: | |
4658 | ||
4659 | @table @code | |
4660 | ||
6ffa706b AK |
4661 | @item --list-updaters |
4662 | @itemx -L | |
4663 | List available updaters and exit (see @option{--type} above.) | |
4664 | ||
7d193ec3 EB |
4665 | @item --list-dependent |
4666 | @itemx -l | |
4667 | List top-level dependent packages that would need to be rebuilt as a | |
4668 | result of upgrading one or more packages. | |
4669 | ||
4670 | @end table | |
4671 | ||
4672 | Be aware that the @code{--list-dependent} option only | |
4673 | @emph{approximates} the rebuilds that would be required as a result of | |
4674 | an upgrade. More rebuilds might be required under some circumstances. | |
4675 | ||
4676 | @example | |
7779ab61 LC |
4677 | $ guix refresh --list-dependent flex |
4678 | Building the following 120 packages would ensure 213 dependent packages are rebuilt: | |
4679 | hop-2.4.0 geiser-0.4 notmuch-0.18 mu-0.9.9.5 cflow-1.4 idutils-4.6 @dots{} | |
7d193ec3 EB |
4680 | @end example |
4681 | ||
4682 | The command above lists a set of packages that could be built to check | |
4683 | for compatibility with an upgraded @code{flex} package. | |
4684 | ||
f9230085 LC |
4685 | The following options can be used to customize GnuPG operation: |
4686 | ||
4687 | @table @code | |
4688 | ||
f9230085 LC |
4689 | @item --gpg=@var{command} |
4690 | Use @var{command} as the GnuPG 2.x command. @var{command} is searched | |
4691 | for in @code{$PATH}. | |
4692 | ||
2bc53ba9 LC |
4693 | @item --key-download=@var{policy} |
4694 | Handle missing OpenPGP keys according to @var{policy}, which may be one | |
4695 | of: | |
4696 | ||
4697 | @table @code | |
4698 | @item always | |
4699 | Always download missing OpenPGP keys from the key server, and add them | |
4700 | to the user's GnuPG keyring. | |
4701 | ||
4702 | @item never | |
4703 | Never try to download missing OpenPGP keys. Instead just bail out. | |
4704 | ||
4705 | @item interactive | |
4706 | When a package signed with an unknown OpenPGP key is encountered, ask | |
4707 | the user whether to download it or not. This is the default behavior. | |
4708 | @end table | |
4709 | ||
4710 | @item --key-server=@var{host} | |
4711 | Use @var{host} as the OpenPGP key server when importing a public key. | |
4712 | ||
f9230085 LC |
4713 | @end table |
4714 | ||
b4f5e0e8 CR |
4715 | @node Invoking guix lint |
4716 | @section Invoking @command{guix lint} | |
f97c9175 AE |
4717 | The @command{guix lint} command is meant to help package developers avoid |
4718 | common errors and use a consistent style. It runs a number of checks on | |
4719 | a given set of packages in order to find common mistakes in their | |
873c4085 LC |
4720 | definitions. Available @dfn{checkers} include (see |
4721 | @code{--list-checkers} for a complete list): | |
4722 | ||
4723 | @table @code | |
4724 | @item synopsis | |
4725 | @itemx description | |
4726 | Validate certain typographical and stylistic rules about package | |
4727 | descriptions and synopses. | |
4728 | ||
4729 | @item inputs-should-be-native | |
4730 | Identify inputs that should most likely be native inputs. | |
4731 | ||
4732 | @item source | |
4733 | @itemx home-page | |
50f5c46d | 4734 | @itemx source-file-name |
873c4085 | 4735 | Probe @code{home-page} and @code{source} URLs and report those that are |
50f5c46d | 4736 | invalid. Check that the source file name is meaningful, e.g. is not |
f97c9175 AE |
4737 | just a version number or ``git-checkout'', without a declared |
4738 | @code{file-name} (@pxref{origin Reference}). | |
40a7d4e5 | 4739 | |
5432734b LC |
4740 | @item cve |
4741 | Report known vulnerabilities found in the Common Vulnerabilities and | |
4742 | Exposures (CVE) database | |
4743 | @uref{https://nvd.nist.gov/download.cfm#CVE_FEED, published by the US | |
4744 | NIST}. | |
4745 | ||
40a7d4e5 LC |
4746 | @item formatting |
4747 | Warn about obvious source code formatting issues: trailing white space, | |
4748 | use of tabulations, etc. | |
873c4085 | 4749 | @end table |
b4f5e0e8 CR |
4750 | |
4751 | The general syntax is: | |
4752 | ||
4753 | @example | |
4754 | guix lint @var{options} @var{package}@dots{} | |
4755 | @end example | |
4756 | ||
4757 | If no package is given on the command line, then all packages are checked. | |
4758 | The @var{options} may be zero or more of the following: | |
4759 | ||
4760 | @table @code | |
f97c9175 AE |
4761 | @item --list-checkers |
4762 | @itemx -l | |
4763 | List and describe all the available checkers that will be run on packages | |
4764 | and exit. | |
b4f5e0e8 | 4765 | |
dd7c013d CR |
4766 | @item --checkers |
4767 | @itemx -c | |
4768 | Only enable the checkers specified in a comma-separated list using the | |
4769 | names returned by @code{--list-checkers}. | |
4770 | ||
b4f5e0e8 | 4771 | @end table |
37166310 | 4772 | |
fcc58db6 LC |
4773 | @node Invoking guix size |
4774 | @section Invoking @command{guix size} | |
4775 | ||
4776 | The @command{guix size} command helps package developers profile the | |
4777 | disk usage of packages. It is easy to overlook the impact of an | |
4778 | additional dependency added to a package, or the impact of using a | |
4779 | single output for a package that could easily be split (@pxref{Packages | |
f97c9175 | 4780 | with Multiple Outputs}). Such are the typical issues that |
fcc58db6 LC |
4781 | @command{guix size} can highlight. |
4782 | ||
4783 | The command can be passed a package specification such as @code{gcc-4.8} | |
4784 | or @code{guile:debug}, or a file name in the store. Consider this | |
4785 | example: | |
4786 | ||
4787 | @example | |
4788 | $ guix size coreutils | |
4789 | store item total self | |
4790 | /gnu/store/@dots{}-coreutils-8.23 70.0 13.9 19.8% | |
4791 | /gnu/store/@dots{}-gmp-6.0.0a 55.3 2.5 3.6% | |
4792 | /gnu/store/@dots{}-acl-2.2.52 53.7 0.5 0.7% | |
4793 | /gnu/store/@dots{}-attr-2.4.46 53.2 0.3 0.5% | |
4794 | /gnu/store/@dots{}-gcc-4.8.4-lib 52.9 15.7 22.4% | |
4795 | /gnu/store/@dots{}-glibc-2.21 37.2 37.2 53.1% | |
4796 | @end example | |
4797 | ||
4798 | @cindex closure | |
4799 | The store items listed here constitute the @dfn{transitive closure} of | |
4800 | Coreutils---i.e., Coreutils and all its dependencies, recursively---as | |
4801 | would be returned by: | |
4802 | ||
4803 | @example | |
4804 | $ guix gc -R /gnu/store/@dots{}-coreutils-8.23 | |
4805 | @end example | |
4806 | ||
f97c9175 | 4807 | Here the output shows three columns next to store items. The first column, |
fcc58db6 LC |
4808 | labeled ``total'', shows the size in mebibytes (MiB) of the closure of |
4809 | the store item---that is, its own size plus the size of all its | |
4810 | dependencies. The next column, labeled ``self'', shows the size of the | |
f97c9175 AE |
4811 | item itself. The last column shows the ratio of the size of the item |
4812 | itself to the space occupied by all the items listed here. | |
fcc58db6 LC |
4813 | |
4814 | In this example, we see that the closure of Coreutils weighs in at | |
4815 | 70@tie{}MiB, half of which is taken by libc. (That libc represents a | |
4816 | large fraction of the closure is not a problem @i{per se} because it is | |
4817 | always available on the system anyway.) | |
4818 | ||
4819 | When the package passed to @command{guix size} is available in the | |
4820 | store, @command{guix size} queries the daemon to determine its | |
4821 | dependencies, and measures its size in the store, similar to @command{du | |
4822 | -ms --apparent-size} (@pxref{du invocation,,, coreutils, GNU | |
4823 | Coreutils}). | |
4824 | ||
4825 | When the given package is @emph{not} in the store, @command{guix size} | |
f97c9175 AE |
4826 | reports information based on the available substitutes |
4827 | (@pxref{Substitutes}). This makes it possible it to profile disk usage of | |
4828 | store items that are not even on disk, only available remotely. | |
fcc58db6 | 4829 | |
a8f996c6 | 4830 | The available options are: |
fcc58db6 LC |
4831 | |
4832 | @table @option | |
4833 | ||
d490d06e LC |
4834 | @item --substitute-urls=@var{urls} |
4835 | Use substitute information from @var{urls}. | |
4836 | @xref{client-substitute-urls, the same option for @code{guix build}}. | |
4837 | ||
a8f996c6 | 4838 | @item --map-file=@var{file} |
f97c9175 | 4839 | Write a graphical map of disk usage in PNG format to @var{file}. |
a8f996c6 LC |
4840 | |
4841 | For the example above, the map looks like this: | |
4842 | ||
4843 | @image{images/coreutils-size-map,5in,, map of Coreutils disk usage | |
4844 | produced by @command{guix size}} | |
4845 | ||
4846 | This option requires that | |
4847 | @uref{http://wingolog.org/software/guile-charting/, Guile-Charting} be | |
4848 | installed and visible in Guile's module search path. When that is not | |
4849 | the case, @command{guix size} fails as it tries to load it. | |
4850 | ||
fcc58db6 LC |
4851 | @item --system=@var{system} |
4852 | @itemx -s @var{system} | |
4853 | Consider packages for @var{system}---e.g., @code{x86_64-linux}. | |
4854 | ||
4855 | @end table | |
4856 | ||
88856916 LC |
4857 | @node Invoking guix graph |
4858 | @section Invoking @command{guix graph} | |
4859 | ||
4860 | @cindex DAG | |
4861 | Packages and their dependencies form a @dfn{graph}, specifically a | |
4862 | directed acyclic graph (DAG). It can quickly become difficult to have a | |
f97c9175 AE |
4863 | mental model of the package DAG, so the @command{guix graph} command |
4864 | provides a visual representation of the DAG. @command{guix graph} | |
4865 | emits a DAG representation in the input format of | |
88856916 | 4866 | @uref{http://www.graphviz.org/, Graphviz}, so its output can be passed |
f97c9175 | 4867 | directly to the @command{dot} command of Graphviz. The general |
88856916 LC |
4868 | syntax is: |
4869 | ||
4870 | @example | |
4871 | guix graph @var{options} @var{package}@dots{} | |
4872 | @end example | |
4873 | ||
4874 | For example, the following command generates a PDF file representing the | |
4875 | package DAG for the GNU@tie{}Core Utilities, showing its build-time | |
4876 | dependencies: | |
4877 | ||
4878 | @example | |
4879 | guix graph coreutils | dot -Tpdf > dag.pdf | |
4880 | @end example | |
4881 | ||
4882 | The output looks like this: | |
4883 | ||
4884 | @image{images/coreutils-graph,2in,,Dependency graph of the GNU Coreutils} | |
4885 | ||
4886 | Nice little graph, no? | |
4887 | ||
f97c9175 | 4888 | But there is more than one graph! The one above is concise: it is the |
88856916 | 4889 | graph of package objects, omitting implicit inputs such as GCC, libc, |
f97c9175 AE |
4890 | grep, etc. It is often useful to have such a concise graph, but |
4891 | sometimes one may want to see more details. @command{guix graph} supports | |
4892 | several types of graphs, allowing you to choose the level of detail: | |
88856916 LC |
4893 | |
4894 | @table @code | |
4895 | @item package | |
f97c9175 | 4896 | This is the default type used in the example above. It shows the DAG of |
88856916 LC |
4897 | package objects, excluding implicit dependencies. It is concise, but |
4898 | filters out many details. | |
4899 | ||
4900 | @item bag-emerged | |
4901 | This is the package DAG, @emph{including} implicit inputs. | |
4902 | ||
4903 | For instance, the following command: | |
4904 | ||
4905 | @example | |
4906 | guix graph --type=bag-emerged coreutils | dot -Tpdf > dag.pdf | |
4907 | @end example | |
4908 | ||
4909 | ... yields this bigger graph: | |
4910 | ||
4911 | @image{images/coreutils-bag-graph,,5in,Detailed dependency graph of the GNU Coreutils} | |
4912 | ||
4913 | At the bottom of the graph, we see all the implicit inputs of | |
4914 | @var{gnu-build-system} (@pxref{Build Systems, @code{gnu-build-system}}). | |
4915 | ||
f97c9175 | 4916 | Now, note that the dependencies of these implicit inputs---that is, the |
88856916 LC |
4917 | @dfn{bootstrap dependencies} (@pxref{Bootstrapping})---are not shown |
4918 | here, for conciseness. | |
4919 | ||
4920 | @item bag | |
4921 | Similar to @code{bag-emerged}, but this time including all the bootstrap | |
4922 | dependencies. | |
4923 | ||
38b92daa LC |
4924 | @item bag-with-origins |
4925 | Similar to @code{bag}, but also showing origins and their dependencies. | |
4926 | ||
88856916 LC |
4927 | @item derivations |
4928 | This is the most detailed representation: It shows the DAG of | |
4929 | derivations (@pxref{Derivations}) and plain store items. Compared to | |
4930 | the above representation, many additional nodes are visible, including | |
f97c9175 | 4931 | build scripts, patches, Guile modules, etc. |
88856916 LC |
4932 | |
4933 | @end table | |
4934 | ||
f97c9175 | 4935 | All the types above correspond to @emph{build-time dependencies}. The |
88856916 LC |
4936 | following graph type represents the @emph{run-time dependencies}: |
4937 | ||
4938 | @table @code | |
4939 | @item references | |
4940 | This is the graph of @dfn{references} of a package output, as returned | |
4941 | by @command{guix gc --references} (@pxref{Invoking guix gc}). | |
4942 | ||
4943 | If the given package output is not available in the store, @command{guix | |
4944 | graph} attempts to obtain dependency information from substitutes. | |
4945 | @end table | |
4946 | ||
4947 | The available options are the following: | |
4948 | ||
4949 | @table @option | |
4950 | @item --type=@var{type} | |
4951 | @itemx -t @var{type} | |
4952 | Produce a graph output of @var{type}, where @var{type} must be one of | |
4953 | the values listed above. | |
4954 | ||
4955 | @item --list-types | |
4956 | List the supported graph types. | |
4c8f997a LC |
4957 | |
4958 | @item --expression=@var{expr} | |
4959 | @itemx -e @var{expr} | |
4960 | Consider the package @var{expr} evaluates to. | |
4961 | ||
4962 | This is useful to precisely refer to a package, as in this example: | |
4963 | ||
4964 | @example | |
4965 | guix graph -e '(@@@@ (gnu packages commencement) gnu-make-final)' | |
4966 | @end example | |
88856916 LC |
4967 | @end table |
4968 | ||
4969 | ||
372c4bbc DT |
4970 | @node Invoking guix environment |
4971 | @section Invoking @command{guix environment} | |
4972 | ||
f5fd4fd2 | 4973 | @cindex reproducible build environments |
fe36d84e | 4974 | @cindex development environments |
372c4bbc DT |
4975 | The purpose of @command{guix environment} is to assist hackers in |
4976 | creating reproducible development environments without polluting their | |
4977 | package profile. The @command{guix environment} tool takes one or more | |
f97c9175 | 4978 | packages, builds all of their inputs, and creates a shell |
372c4bbc DT |
4979 | environment to use them. |
4980 | ||
4981 | The general syntax is: | |
4982 | ||
4983 | @example | |
4984 | guix environment @var{options} @var{package}@dots{} | |
4985 | @end example | |
4986 | ||
fe36d84e LC |
4987 | The following example spawns a new shell set up for the development of |
4988 | GNU@tie{}Guile: | |
372c4bbc DT |
4989 | |
4990 | @example | |
4991 | guix environment guile | |
4992 | @end example | |
4993 | ||
f97c9175 AE |
4994 | If the needed dependencies are not built yet, @command{guix environment} |
4995 | automatically builds them. The environment of the new shell is an augmented | |
372c4bbc DT |
4996 | version of the environment that @command{guix environment} was run in. |
4997 | It contains the necessary search paths for building the given package | |
4998 | added to the existing environment variables. To create a ``pure'' | |
f97c9175 | 4999 | environment, in which the original environment variables have been unset, |
50500f7c LC |
5000 | use the @code{--pure} option@footnote{Users sometimes wrongfully augment |
5001 | environment variables such as @code{PATH} in their @file{~/.bashrc} | |
5002 | file. As a consequence, when @code{guix environment} launches it, Bash | |
5003 | may read @file{~/.bashrc}, thereby introducing ``impurities'' in these | |
5004 | environment variables. It is an error to define such environment | |
5005 | variables in @file{.bashrc}; instead, they should be defined in | |
5006 | @file{.bash_profile}, which is sourced only by log-in shells. | |
5007 | @xref{Bash Startup Files,,, bash, The GNU Bash Reference Manual}, for | |
5008 | details on Bash start-up files.}. | |
372c4bbc | 5009 | |
28de8d25 LC |
5010 | @vindex GUIX_ENVIRONMENT |
5011 | @command{guix environment} defines the @code{GUIX_ENVIRONMENT} | |
f97c9175 | 5012 | variable in the shell it spawns. This allows users to, say, define a |
28de8d25 LC |
5013 | specific prompt for development environments in their @file{.bashrc} |
5014 | (@pxref{Bash Startup Files,,, bash, The GNU Bash Reference Manual}): | |
5015 | ||
5016 | @example | |
5017 | if [ -n "$GUIX_ENVIRONMENT" ] | |
5018 | then | |
5019 | export PS1="\u@@\h \w [dev]\$ " | |
5020 | fi | |
5021 | @end example | |
5022 | ||
372c4bbc DT |
5023 | Additionally, more than one package may be specified, in which case the |
5024 | union of the inputs for the given packages are used. For example, the | |
5025 | command below spawns a shell where all of the dependencies of both Guile | |
5026 | and Emacs are available: | |
5027 | ||
5028 | @example | |
5029 | guix environment guile emacs | |
5030 | @end example | |
5031 | ||
1de2fe95 DT |
5032 | Sometimes an interactive shell session is not desired. An arbitrary |
5033 | command may be invoked by placing the @code{--} token to separate the | |
5034 | command from the rest of the arguments: | |
372c4bbc DT |
5035 | |
5036 | @example | |
1de2fe95 | 5037 | guix environment guile -- make -j4 |
372c4bbc DT |
5038 | @end example |
5039 | ||
fe36d84e LC |
5040 | In other situations, it is more convenient to specify the list of |
5041 | packages needed in the environment. For example, the following command | |
5042 | runs @command{python} from an environment containing Python@tie{}2.7 and | |
5043 | NumPy: | |
5044 | ||
5045 | @example | |
1de2fe95 | 5046 | guix environment --ad-hoc python2-numpy python-2.7 -- python |
fe36d84e LC |
5047 | @end example |
5048 | ||
cc90fbbf DT |
5049 | Furthermore, one might want the dependencies of a package and also some |
5050 | additional packages that are not build-time or runtime dependencies, but | |
5051 | are useful when developing nonetheless. Because of this, the | |
5052 | @code{--ad-hoc} flag is positional. Packages appearing before | |
5053 | @code{--ad-hoc} are interpreted as packages whose dependencies will be | |
5054 | added to the environment. Packages appearing after are interpreted as | |
5055 | packages that will be added to the environment directly. For example, | |
5056 | the following command creates a Guix development environment that | |
5057 | additionally includes Git and strace: | |
5058 | ||
5059 | @example | |
5060 | guix environment guix --ad-hoc git strace | |
5061 | @end example | |
5062 | ||
f535dcbe DT |
5063 | Sometimes it is desirable to isolate the environment as much as |
5064 | possible, for maximal purity and reproducibility. In particular, when | |
5065 | using Guix on a host distro that is not GuixSD, it is desirable to | |
5066 | prevent access to @file{/usr/bin} and other system-wide resources from | |
5067 | the development environment. For example, the following command spawns | |
5068 | a Guile REPL in a ``container'' where only the store and the current | |
5069 | working directory are mounted: | |
5070 | ||
5071 | @example | |
5072 | guix environment --ad-hoc --container guile -- guile | |
5073 | @end example | |
5074 | ||
0f252e26 | 5075 | @quotation Note |
cfd35b4e | 5076 | The @code{--container} option requires Linux-libre 3.19 or newer. |
0f252e26 DT |
5077 | @end quotation |
5078 | ||
fe36d84e | 5079 | The available options are summarized below. |
372c4bbc DT |
5080 | |
5081 | @table @code | |
5082 | @item --expression=@var{expr} | |
5083 | @itemx -e @var{expr} | |
c9c282ce DT |
5084 | Create an environment for the package or list of packages that |
5085 | @var{expr} evaluates to. | |
372c4bbc | 5086 | |
fe36d84e LC |
5087 | For example, running: |
5088 | ||
5089 | @example | |
5090 | guix environment -e '(@@ (gnu packages maths) petsc-openmpi)' | |
5091 | @end example | |
5092 | ||
5093 | starts a shell with the environment for this specific variant of the | |
5094 | PETSc package. | |
5095 | ||
c9c282ce DT |
5096 | Running: |
5097 | ||
5098 | @example | |
5c2b2f00 | 5099 | guix environment --ad-hoc -e '(@@ (gnu) %base-packages)' |
c9c282ce DT |
5100 | @end example |
5101 | ||
5102 | starts a shell with all the GuixSD base packages available. | |
5103 | ||
779aa003 DT |
5104 | The above commands only the use default output of the given packages. |
5105 | To select other outputs, two element tuples can be specified: | |
5106 | ||
5107 | @example | |
5108 | guix environment --ad-hoc -e '(list (@ (gnu packages bash) bash) "include")' | |
5109 | @end example | |
5110 | ||
372c4bbc DT |
5111 | @item --load=@var{file} |
5112 | @itemx -l @var{file} | |
c9c282ce DT |
5113 | Create an environment for the package or list of packages that the code |
5114 | within @var{file} evaluates to. | |
372c4bbc | 5115 | |
fe36d84e LC |
5116 | As an example, @var{file} might contain a definition like this |
5117 | (@pxref{Defining Packages}): | |
5118 | ||
5119 | @example | |
5120 | @verbatiminclude environment-gdb.scm | |
5121 | @end example | |
5122 | ||
a54bd6d7 DT |
5123 | @item --ad-hoc |
5124 | Include all specified packages in the resulting environment, as if an | |
5125 | @i{ad hoc} package were defined with them as inputs. This option is | |
5126 | useful for quickly creating an environment without having to write a | |
5127 | package expression to contain the desired inputs. | |
5128 | ||
5129 | For instance, the command: | |
5130 | ||
5131 | @example | |
1de2fe95 | 5132 | guix environment --ad-hoc guile guile-sdl -- guile |
a54bd6d7 DT |
5133 | @end example |
5134 | ||
5135 | runs @command{guile} in an environment where Guile and Guile-SDL are | |
5136 | available. | |
5137 | ||
417c39f1 | 5138 | Note that this example implicitly asks for the default output of |
f97c9175 | 5139 | @code{guile} and @code{guile-sdl}, but it is possible to ask for a |
417c39f1 LC |
5140 | specific output---e.g., @code{glib:bin} asks for the @code{bin} output |
5141 | of @code{glib} (@pxref{Packages with Multiple Outputs}). | |
5142 | ||
cc90fbbf DT |
5143 | This option may be composed with the default behavior of @command{guix |
5144 | environment}. Packages appearing before @code{--ad-hoc} are interpreted | |
5145 | as packages whose dependencies will be added to the environment, the | |
5146 | default behavior. Packages appearing after are interpreted as packages | |
5147 | that will be added to the environment directly. | |
5148 | ||
372c4bbc DT |
5149 | @item --pure |
5150 | Unset existing environment variables when building the new environment. | |
5151 | This has the effect of creating an environment in which search paths | |
5152 | only contain package inputs. | |
5153 | ||
5154 | @item --search-paths | |
5155 | Display the environment variable definitions that make up the | |
5156 | environment. | |
ce367ef3 LC |
5157 | |
5158 | @item --system=@var{system} | |
5159 | @itemx -s @var{system} | |
5160 | Attempt to build for @var{system}---e.g., @code{i686-linux}. | |
f535dcbe DT |
5161 | |
5162 | @item --container | |
5163 | @itemx -C | |
5164 | @cindex container | |
5165 | Run @var{command} within an isolated container. The current working | |
56b6befb | 5166 | directory outside the container is mapped inside the |
f535dcbe DT |
5167 | container. Additionally, the spawned process runs as the current user |
5168 | outside the container, but has root privileges in the context of the | |
5169 | container. | |
5170 | ||
5171 | @item --network | |
5172 | @itemx -N | |
5173 | For containers, share the network namespace with the host system. | |
5174 | Containers created without this flag only have access to the loopback | |
5175 | device. | |
5176 | ||
5177 | @item --expose=@var{source}[=@var{target}] | |
5178 | For containers, expose the file system @var{source} from the host system | |
5179 | as the read-only file system @var{target} within the container. If | |
5180 | @var{target} is not specified, @var{source} is used as the target mount | |
5181 | point in the container. | |
5182 | ||
5183 | The example below spawns a Guile REPL in a container in which the user's | |
5184 | home directory is accessible read-only via the @file{/exchange} | |
5185 | directory: | |
5186 | ||
5187 | @example | |
5188 | guix environment --container --expose=$HOME=/exchange guile -- guile | |
5189 | @end example | |
5190 | ||
5c2b2f00 | 5191 | @item --share=@var{source}[=@var{target}] |
f535dcbe DT |
5192 | For containers, share the file system @var{source} from the host system |
5193 | as the writable file system @var{target} within the container. If | |
5194 | @var{target} is not specified, @var{source} is used as the target mount | |
5195 | point in the container. | |
5196 | ||
5197 | The example below spawns a Guile REPL in a container in which the user's | |
5198 | home directory is accessible for both reading and writing via the | |
5199 | @file{/exchange} directory: | |
5200 | ||
5201 | @example | |
5202 | guix environment --container --share=$HOME=/exchange guile -- guile | |
5203 | @end example | |
372c4bbc DT |
5204 | @end table |
5205 | ||
5206 | It also supports all of the common build options that @command{guix | |
ccd7158d | 5207 | build} supports (@pxref{Common Build Options}). |
372c4bbc | 5208 | |
aff8ce7c DT |
5209 | @node Invoking guix publish |
5210 | @section Invoking @command{guix publish} | |
5211 | ||
5212 | The purpose of @command{guix publish} is to enable users to easily share | |
f97c9175 | 5213 | their store with others, who can then use it as a substitute server |
8ce229fc LC |
5214 | (@pxref{Substitutes}). |
5215 | ||
5216 | When @command{guix publish} runs, it spawns an HTTP server which allows | |
5217 | anyone with network access to obtain substitutes from it. This means | |
5218 | that any machine running Guix can also act as if it were a build farm, | |
5219 | since the HTTP interface is compatible with Hydra, the software behind | |
5220 | the @code{hydra.gnu.org} build farm. | |
aff8ce7c DT |
5221 | |
5222 | For security, each substitute is signed, allowing recipients to check | |
5223 | their authenticity and integrity (@pxref{Substitutes}). Because | |
f97c9175 | 5224 | @command{guix publish} uses the signing key of the system, which is only |
5463fe51 LC |
5225 | readable by the system administrator, it must be started as root; the |
5226 | @code{--user} option makes it drop root privileges early on. | |
aff8ce7c | 5227 | |
b18812b6 LC |
5228 | The signing key pair must be generated before @command{guix publish} is |
5229 | launched, using @command{guix archive --generate-key} (@pxref{Invoking | |
5230 | guix archive}). | |
5231 | ||
aff8ce7c DT |
5232 | The general syntax is: |
5233 | ||
5234 | @example | |
5235 | guix publish @var{options}@dots{} | |
5236 | @end example | |
5237 | ||
5238 | Running @command{guix publish} without any additional arguments will | |
5239 | spawn an HTTP server on port 8080: | |
5240 | ||
5241 | @example | |
5242 | guix publish | |
5243 | @end example | |
5244 | ||
5245 | Once a publishing server has been authorized (@pxref{Invoking guix | |
5246 | archive}), the daemon may download substitutes from it: | |
5247 | ||
5248 | @example | |
5249 | guix-daemon --substitute-urls=http://example.org:8080 | |
5250 | @end example | |
5251 | ||
5252 | The following options are available: | |
5253 | ||
5254 | @table @code | |
5255 | @item --port=@var{port} | |
5256 | @itemx -p @var{port} | |
5257 | Listen for HTTP requests on @var{port}. | |
5258 | ||
9e2292ef LC |
5259 | @item --listen=@var{host} |
5260 | Listen on the network interface for @var{host}. The default is to | |
5261 | accept connections from any interface. | |
5262 | ||
5463fe51 LC |
5263 | @item --user=@var{user} |
5264 | @itemx -u @var{user} | |
5265 | Change privileges to @var{user} as soon as possible---i.e., once the | |
5266 | server socket is open and the signing key has been read. | |
5267 | ||
aff8ce7c DT |
5268 | @item --repl[=@var{port}] |
5269 | @itemx -r [@var{port}] | |
5270 | Spawn a Guile REPL server (@pxref{REPL Servers,,, guile, GNU Guile | |
8ce229fc LC |
5271 | Reference Manual}) on @var{port} (37146 by default). This is used |
5272 | primarily for debugging a running @command{guix publish} server. | |
aff8ce7c DT |
5273 | @end table |
5274 | ||
1c52181f LC |
5275 | Enabling @command{guix publish} on a GuixSD system is a one-liner: just |
5276 | add a call to @code{guix-publish-service} in the @code{services} field | |
5277 | of the @code{operating-system} declaration (@pxref{guix-publish-service, | |
5278 | @code{guix-publish-service}}). | |
5279 | ||
d23c20f1 LC |
5280 | |
5281 | @node Invoking guix challenge | |
5282 | @section Invoking @command{guix challenge} | |
5283 | ||
5284 | @cindex reproducible builds | |
5285 | @cindex verifiable builds | |
5286 | ||
5287 | Do the binaries provided by this server really correspond to the source | |
f97c9175 | 5288 | code it claims to build? Is a package build process deterministic? |
d23c20f1 LC |
5289 | These are the questions the @command{guix challenge} command attempts to |
5290 | answer. | |
5291 | ||
5292 | The former is obviously an important question: Before using a substitute | |
f97c9175 | 5293 | server (@pxref{Substitutes}), one had better @emph{verify} that it |
d23c20f1 LC |
5294 | provides the right binaries, and thus @emph{challenge} it. The latter |
5295 | is what enables the former: If package builds are deterministic, then | |
5296 | independent builds of the package should yield the exact same result, | |
5297 | bit for bit; if a server provides a binary different from the one | |
5298 | obtained locally, it may be either corrupt or malicious. | |
5299 | ||
5300 | We know that the hash that shows up in @file{/gnu/store} file names is | |
5301 | the hash of all the inputs of the process that built the file or | |
5302 | directory---compilers, libraries, build scripts, | |
5303 | etc. (@pxref{Introduction}). Assuming deterministic build processes, | |
5304 | one store file name should map to exactly one build output. | |
5305 | @command{guix challenge} checks whether there is, indeed, a single | |
5306 | mapping by comparing the build outputs of several independent builds of | |
5307 | any given store item. | |
5308 | ||
f97c9175 | 5309 | The command output looks like this: |
d23c20f1 LC |
5310 | |
5311 | @smallexample | |
5312 | $ guix challenge --substitute-urls="http://hydra.gnu.org http://guix.example.org" | |
5313 | updating list of substitutes from 'http://hydra.gnu.org'... 100.0% | |
5314 | updating list of substitutes from 'http://guix.example.org'... 100.0% | |
5315 | /gnu/store/@dots{}-openssl-1.0.2d contents differ: | |
5316 | local hash: 0725l22r5jnzazaacncwsvp9kgf42266ayyp814v7djxs7nk963q | |
5317 | http://hydra.gnu.org/nar/@dots{}-openssl-1.0.2d: 0725l22r5jnzazaacncwsvp9kgf42266ayyp814v7djxs7nk963q | |
5318 | http://guix.example.org/nar/@dots{}-openssl-1.0.2d: 1zy4fmaaqcnjrzzajkdn3f5gmjk754b43qkq47llbyak9z0qjyim | |
5319 | /gnu/store/@dots{}-git-2.5.0 contents differ: | |
5320 | local hash: 00p3bmryhjxrhpn2gxs2fy0a15lnip05l97205pgbk5ra395hyha | |
5321 | http://hydra.gnu.org/nar/@dots{}-git-2.5.0: 069nb85bv4d4a6slrwjdy8v1cn4cwspm3kdbmyb81d6zckj3nq9f | |
5322 | http://guix.example.org/nar/@dots{}-git-2.5.0: 0mdqa9w1p6cmli6976v4wi0sw9r4p5prkj7lzfd1877wk11c9c73 | |
5323 | /gnu/store/@dots{}-pius-2.1.1 contents differ: | |
5324 | local hash: 0k4v3m9z1zp8xzzizb7d8kjj72f9172xv078sq4wl73vnq9ig3ax | |
5325 | http://hydra.gnu.org/nar/@dots{}-pius-2.1.1: 0k4v3m9z1zp8xzzizb7d8kjj72f9172xv078sq4wl73vnq9ig3ax | |
5326 | http://guix.example.org/nar/@dots{}-pius-2.1.1: 1cy25x1a4fzq5rk0pmvc8xhwyffnqz95h2bpvqsz2mpvlbccy0gs | |
5327 | @end smallexample | |
5328 | ||
5329 | @noindent | |
5330 | In this example, @command{guix challenge} first scans the store to | |
5331 | determine the set of locally-built derivations---as opposed to store | |
5332 | items that were downloaded from a substitute server---and then queries | |
5333 | all the substitute servers. It then reports those store items for which | |
5334 | the servers obtained a result different from the local build. | |
5335 | ||
5336 | @cindex non-determinism, in package builds | |
5337 | As an example, @code{guix.example.org} always gets a different answer. | |
5338 | Conversely, @code{hydra.gnu.org} agrees with local builds, except in the | |
5339 | case of Git. This might indicate that the build process of Git is | |
5340 | non-deterministic, meaning that its output varies as a function of | |
5341 | various things that Guix does not fully control, in spite of building | |
5342 | packages in isolated environments (@pxref{Features}). Most common | |
5343 | sources of non-determinism include the addition of timestamps in build | |
5344 | results, the inclusion of random numbers, and directory listings sorted | |
5345 | by inode number. See @uref{http://reproducible.debian.net/howto/}, for | |
5346 | more information. | |
5347 | ||
f97c9175 | 5348 | To find out what is wrong with this Git binary, we can do something along |
d23c20f1 LC |
5349 | these lines (@pxref{Invoking guix archive}): |
5350 | ||
5351 | @example | |
5352 | $ wget -q -O - http://hydra.gnu.org/nar/@dots{}-git-2.5.0 \ | |
5353 | | guix archive -x /tmp/git | |
043f4698 | 5354 | $ diff -ur --no-dereference /gnu/store/@dots{}-git.2.5.0 /tmp/git |
d23c20f1 LC |
5355 | @end example |
5356 | ||
5357 | This command shows the difference between the files resulting from the | |
5358 | local build, and the files resulting from the build on | |
5359 | @code{hydra.gnu.org} (@pxref{Overview, Comparing and Merging Files,, | |
5360 | diffutils, Comparing and Merging Files}). The @command{diff} command | |
5361 | works great for text files. When binary files differ, a better option | |
5362 | is @uref{http://diffoscope.org/, Diffoscope}, a tool that helps | |
5363 | visualize differences for all kinds of files. | |
5364 | ||
f97c9175 | 5365 | Once you have done that work, you can tell whether the differences are due |
d23c20f1 LC |
5366 | to a non-deterministic build process or to a malicious server. We try |
5367 | hard to remove sources of non-determinism in packages to make it easier | |
f97c9175 AE |
5368 | to verify substitutes, but of course, this is a process that |
5369 | involves not just Guix, but a large part of the free software community. | |
d23c20f1 LC |
5370 | In the meantime, @command{guix challenge} is one tool to help address |
5371 | the problem. | |
5372 | ||
5373 | If you are writing packages for Guix, you are encouraged to check | |
5374 | whether @code{hydra.gnu.org} and other substitute servers obtain the | |
5375 | same build result as you did with: | |
5376 | ||
5377 | @example | |
5378 | $ guix challenge @var{package} | |
5379 | @end example | |
5380 | ||
5381 | @noindent | |
f97c9175 | 5382 | where @var{package} is a package specification such as |
d23c20f1 LC |
5383 | @code{guile-2.0} or @code{glibc:debug}. |
5384 | ||
5385 | The general syntax is: | |
5386 | ||
5387 | @example | |
5388 | guix challenge @var{options} [@var{packages}@dots{}] | |
5389 | @end example | |
5390 | ||
5391 | The one option that matters is: | |
5392 | ||
5393 | @table @code | |
5394 | ||
5395 | @item --substitute-urls=@var{urls} | |
5396 | Consider @var{urls} the whitespace-separated list of substitute source | |
5397 | URLs to compare to. | |
5398 | ||
5399 | @end table | |
5400 | ||
5401 | ||
32efa254 DT |
5402 | @node Invoking guix container |
5403 | @section Invoking @command{guix container} | |
5404 | @cindex container | |
5405 | ||
5406 | @quotation Note | |
5407 | As of version @value{VERSION}, this tool is experimental. The interface | |
5408 | is subject to radical change in the future. | |
5409 | @end quotation | |
5410 | ||
5411 | The purpose of @command{guix container} is to manipulate processes | |
5412 | running within an isolated environment, commonly known as a | |
46c36586 | 5413 | ``container'', typically created by the @command{guix environment} |
32efa254 DT |
5414 | (@pxref{Invoking guix environment}) and @command{guix system container} |
5415 | (@pxref{Invoking guix system}) commands. | |
5416 | ||
5417 | The general syntax is: | |
5418 | ||
5419 | @example | |
5420 | guix container @var{action} @var{options}@dots{} | |
5421 | @end example | |
5422 | ||
5423 | @var{action} specifies the operation to perform with a container, and | |
5424 | @var{options} specifies the context-specific arguments for the action. | |
5425 | ||
5426 | The following actions are available: | |
5427 | ||
5428 | @table @code | |
5429 | @item exec | |
5430 | Execute a command within the context of a running container. | |
5431 | ||
5432 | The syntax is: | |
5433 | ||
5434 | @example | |
5435 | guix container exec @var{pid} @var{program} @var{arguments}@dots{} | |
5436 | @end example | |
5437 | ||
5438 | @var{pid} specifies the process ID of the running container. | |
f97c9175 AE |
5439 | @var{program} specifies an executable file name within the root file |
5440 | system of the container. @var{arguments} are the additional options that | |
5441 | will be passed to @var{program}. | |
32efa254 DT |
5442 | |
5443 | The following command launches an interactive login shell inside a | |
5444 | GuixSD container, started by @command{guix system container}, and whose | |
5445 | process ID is 9001: | |
5446 | ||
5447 | @example | |
5448 | guix container exec 9001 /run/current-system/profile/bin/bash --login | |
5449 | @end example | |
5450 | ||
5451 | Note that the @var{pid} cannot be the parent process of a container. It | |
f97c9175 | 5452 | must be PID 1 of the container or one of its child processes. |
32efa254 DT |
5453 | |
5454 | @end table | |
5455 | ||
a1ba8475 LC |
5456 | @c ********************************************************************* |
5457 | @node GNU Distribution | |
5458 | @chapter GNU Distribution | |
5459 | ||
3ca2731c | 5460 | @cindex Guix System Distribution |
4705641f | 5461 | @cindex GuixSD |
3ca2731c LC |
5462 | Guix comes with a distribution of the GNU system consisting entirely of |
5463 | free software@footnote{The term ``free'' here refers to the | |
a1ba8475 | 5464 | @url{http://www.gnu.org/philosophy/free-sw.html,freedom provided to |
3ca2731c | 5465 | users of that software}.}. The |
35ed9306 LC |
5466 | distribution can be installed on its own (@pxref{System Installation}), |
5467 | but it is also possible to install Guix as a package manager on top of | |
5468 | an installed GNU/Linux system (@pxref{Installation}). To distinguish | |
3ca2731c | 5469 | between the two, we refer to the standalone distribution as the Guix |
4705641f | 5470 | System Distribution, or GuixSD. |
35ed9306 LC |
5471 | |
5472 | The distribution provides core GNU packages such as GNU libc, GCC, and | |
5473 | Binutils, as well as many GNU and non-GNU applications. The complete | |
5474 | list of available packages can be browsed | |
093ae1be | 5475 | @url{http://www.gnu.org/software/guix/packages,on-line} or by |
d03bb653 | 5476 | running @command{guix package} (@pxref{Invoking guix package}): |
a1ba8475 LC |
5477 | |
5478 | @example | |
e49951eb | 5479 | guix package --list-available |
a1ba8475 LC |
5480 | @end example |
5481 | ||
f97c9175 | 5482 | Our goal is to provide a practical 100% free software distribution of |
401c53c4 LC |
5483 | Linux-based and other variants of GNU, with a focus on the promotion and |
5484 | tight integration of GNU components, and an emphasis on programs and | |
5485 | tools that help users exert that freedom. | |
5486 | ||
3ca2731c | 5487 | Packages are currently available on the following platforms: |
c320011d LC |
5488 | |
5489 | @table @code | |
5490 | ||
5491 | @item x86_64-linux | |
5492 | Intel/AMD @code{x86_64} architecture, Linux-Libre kernel; | |
5493 | ||
5494 | @item i686-linux | |
5495 | Intel 32-bit architecture (IA32), Linux-Libre kernel; | |
5496 | ||
aa1e1947 | 5497 | @item armhf-linux |
aa725117 | 5498 | ARMv7-A architecture with hard float, Thumb-2 and NEON, |
f97c9175 AE |
5499 | using the EABI hard-float application binary interface (ABI), |
5500 | and Linux-Libre kernel. | |
aa1e1947 | 5501 | |
c320011d LC |
5502 | @item mips64el-linux |
5503 | little-endian 64-bit MIPS processors, specifically the Loongson series, | |
f97c9175 | 5504 | n32 ABI, and Linux-Libre kernel. |
c320011d LC |
5505 | |
5506 | @end table | |
5507 | ||
4705641f | 5508 | GuixSD itself is currently only available on @code{i686} and @code{x86_64}. |
3ca2731c | 5509 | |
c320011d LC |
5510 | @noindent |
5511 | For information on porting to other architectures or kernels, | |
f97c9175 | 5512 | @pxref{Porting}. |
c320011d | 5513 | |
401c53c4 | 5514 | @menu |
5af6de3e | 5515 | * System Installation:: Installing the whole operating system. |
35ed9306 | 5516 | * System Configuration:: Configuring the operating system. |
91ef73d4 | 5517 | * Installing Debugging Files:: Feeding the debugger. |
05962f29 | 5518 | * Security Updates:: Deploying security fixes quickly. |
401c53c4 | 5519 | * Package Modules:: Packages from the programmer's viewpoint. |
da7cabd4 | 5520 | * Packaging Guidelines:: Growing the distribution. |
401c53c4 | 5521 | * Bootstrapping:: GNU/Linux built from scratch. |
8b315a6d | 5522 | * Porting:: Targeting another platform or kernel. |
401c53c4 LC |
5523 | @end menu |
5524 | ||
5525 | Building this distribution is a cooperative effort, and you are invited | |
081145cf | 5526 | to join! @xref{Contributing}, for information about how you can help. |
401c53c4 | 5527 | |
5af6de3e LC |
5528 | @node System Installation |
5529 | @section System Installation | |
5530 | ||
3ca2731c LC |
5531 | @cindex Guix System Distribution |
5532 | This section explains how to install the Guix System Distribution | |
5533 | on a machine. The Guix package manager can | |
35ed9306 LC |
5534 | also be installed on top of a running GNU/Linux system, |
5535 | @pxref{Installation}. | |
5af6de3e LC |
5536 | |
5537 | @ifinfo | |
5538 | @c This paragraph is for people reading this from tty2 of the | |
5539 | @c installation image. | |
5540 | You're reading this documentation with an Info reader. For details on | |
5541 | how to use it, hit the @key{RET} key (``return'' or ``enter'') on the | |
6621cdb6 | 5542 | link that follows: @pxref{Help,,, info, Info: An Introduction}. Hit |
5af6de3e LC |
5543 | @kbd{l} afterwards to come back here. |
5544 | @end ifinfo | |
5545 | ||
dedb8d5e LC |
5546 | @menu |
5547 | * Limitations:: What you can expect. | |
5548 | * USB Stick Installation:: Preparing the installation medium. | |
5549 | * Preparing for Installation:: Networking, partitioning, etc. | |
5550 | * Proceeding with the Installation:: The real thing. | |
5551 | * Building the Installation Image:: How this comes to be. | |
5552 | @end menu | |
5553 | ||
5554 | @node Limitations | |
8aaaae38 LC |
5555 | @subsection Limitations |
5556 | ||
4705641f | 5557 | As of version @value{VERSION}, the Guix System Distribution (GuixSD) is |
3ca2731c | 5558 | not production-ready. It may contain bugs and lack important |
8aaaae38 LC |
5559 | features. Thus, if you are looking for a stable production system that |
5560 | respects your freedom as a computer user, a good solution at this point | |
5561 | is to consider @url{http://www.gnu.org/distros/free-distros.html, one of | |
f97c9175 | 5562 | the more established GNU/Linux distributions}. We hope you can soon switch |
4705641f | 5563 | to the GuixSD without fear, of course. In the meantime, you can |
8aaaae38 LC |
5564 | also keep using your distribution and try out the package manager on top |
5565 | of it (@pxref{Installation}). | |
5566 | ||
5567 | Before you proceed with the installation, be aware of the following | |
5568 | noteworthy limitations applicable to version @value{VERSION}: | |
5569 | ||
5570 | @itemize | |
5571 | @item | |
5572 | The installation process does not include a graphical user interface and | |
5573 | requires familiarity with GNU/Linux (see the following subsections to | |
5574 | get a feel of what that means.) | |
5575 | ||
5576 | @item | |
093ae1be | 5577 | The system does not yet provide full GNOME and KDE desktops. Xfce and |
f97c9175 | 5578 | Enlightenment are available, though, if graphical desktop environments |
093ae1be | 5579 | are your thing, as well as a number of X11 window managers. |
8aaaae38 LC |
5580 | |
5581 | @item | |
dbcb0ab1 | 5582 | Support for the Logical Volume Manager (LVM) is missing. |
8aaaae38 LC |
5583 | |
5584 | @item | |
5585 | Few system services are currently supported out-of-the-box | |
5586 | (@pxref{Services}). | |
5587 | ||
5588 | @item | |
dedb8d5e | 5589 | More than 3,000 packages are available, but you may |
8aaaae38 LC |
5590 | occasionally find that a useful package is missing. |
5591 | @end itemize | |
5592 | ||
f97c9175 AE |
5593 | You have been warned! But more than a disclaimer, this is an invitation |
5594 | to report issues (and success stories!), and to join us in improving it. | |
8aaaae38 | 5595 | @xref{Contributing}, for more info. |
5af6de3e | 5596 | |
dedb8d5e | 5597 | @node USB Stick Installation |
5af6de3e LC |
5598 | @subsection USB Stick Installation |
5599 | ||
5600 | An installation image for USB sticks can be downloaded from | |
4705641f | 5601 | @indicateurl{ftp://alpha.gnu.org/gnu/guix/guixsd-usb-install-@value{VERSION}.@var{system}.xz}, |
5af6de3e LC |
5602 | where @var{system} is one of: |
5603 | ||
5604 | @table @code | |
5605 | @item x86_64-linux | |
5606 | for a GNU/Linux system on Intel/AMD-compatible 64-bit CPUs; | |
5607 | ||
5608 | @item i686-linux | |
5609 | for a 32-bit GNU/Linux system on Intel-compatible CPUs. | |
5610 | @end table | |
5611 | ||
5612 | This image contains a single partition with the tools necessary for an | |
5613 | installation. It is meant to be copied @emph{as is} to a large-enough | |
5614 | USB stick. | |
5615 | ||
5616 | To copy the image to a USB stick, follow these steps: | |
5617 | ||
5618 | @enumerate | |
5619 | @item | |
5620 | Decompress the image using the @command{xz} command: | |
5621 | ||
5622 | @example | |
4705641f | 5623 | xz -d guixsd-usb-install-@value{VERSION}.@var{system}.xz |
5af6de3e LC |
5624 | @end example |
5625 | ||
5626 | @item | |
f97c9175 AE |
5627 | Insert a USB stick of 1@tie{}GiB or more into your machine, and determine |
5628 | its device name. Assuming that the USB stick is known as @file{/dev/sdX}, | |
5af6de3e LC |
5629 | copy the image with: |
5630 | ||
5631 | @example | |
4705641f | 5632 | dd if=guixsd-usb-install-@value{VERSION}.x86_64 of=/dev/sdX |
5af6de3e LC |
5633 | @end example |
5634 | ||
5635 | Access to @file{/dev/sdX} usually requires root privileges. | |
5636 | @end enumerate | |
5637 | ||
5638 | Once this is done, you should be able to reboot the system and boot from | |
5639 | the USB stick. The latter usually requires you to get in the BIOS' boot | |
5640 | menu, where you can choose to boot from the USB stick. | |
5641 | ||
dedb8d5e | 5642 | @node Preparing for Installation |
5af6de3e LC |
5643 | @subsection Preparing for Installation |
5644 | ||
5645 | Once you have successfully booted the image on the USB stick, you should | |
5646 | end up with a root prompt. Several console TTYs are configured and can | |
5647 | be used to run commands as root. TTY2 shows this documentation, | |
5648 | browsable using the Info reader commands (@pxref{Help,,, info, Info: An | |
ae7ffa9e LC |
5649 | Introduction}). The installation system runs the GPM mouse daemon, |
5650 | which allows you to select text with the left mouse button and to paste | |
5651 | it with the middle button. | |
5af6de3e | 5652 | |
dedb8d5e | 5653 | @subsubsection Keyboard Layout |
5af6de3e | 5654 | |
dedb8d5e LC |
5655 | @cindex keyboard layout |
5656 | The installation image uses the US qwerty keyboard layout. If you want | |
5657 | to change it, you can use the @command{loadkeys} command. For example, | |
5658 | the following command selects the Dvorak keyboard layout: | |
5af6de3e | 5659 | |
dedb8d5e LC |
5660 | @example |
5661 | loadkeys dvorak | |
5662 | @end example | |
5663 | ||
5664 | See the files under @file{/run/current-system/profile/share/keymaps} for | |
5665 | a list of available keyboard layouts. Run @command{man loadkeys} for | |
5666 | more information. | |
5667 | ||
5668 | @subsubsection Networking | |
5669 | ||
5670 | Run the following command see what your network interfaces are called: | |
235cba85 LC |
5671 | |
5672 | @example | |
dedb8d5e | 5673 | ifconfig -a |
235cba85 LC |
5674 | @end example |
5675 | ||
95c559c1 | 5676 | @c http://cgit.freedesktop.org/systemd/systemd/tree/src/udev/udev-builtin-net_id.c#n20 |
dedb8d5e LC |
5677 | Wired interfaces have a name starting with @samp{e}; for example, the |
5678 | interface corresponding to the first on-board Ethernet controller is | |
5679 | called @samp{eno1}. Wireless interfaces have a name starting with | |
5680 | @samp{w}, like @samp{w1p2s0}. | |
5681 | ||
5682 | @table @asis | |
5683 | @item Wired connection | |
5684 | To configure a wired network run the following command, substituting | |
5685 | @var{interface} with the name of the wired interface you want to use. | |
5686 | ||
5687 | @example | |
5688 | ifconfig @var{interface} up | |
5689 | @end example | |
5690 | ||
5691 | @item Wireless connection | |
5692 | To configure wireless networking, you can create a configuration file | |
5693 | for the @command{wpa_supplicant} configuration tool (its location is not | |
5694 | important) using one of the available text editors such as | |
5695 | @command{zile}: | |
5696 | ||
5697 | @example | |
5698 | zile wpa_supplicant.conf | |
5699 | @end example | |
5700 | ||
5701 | As an example, the following stanza can go to this file and will work | |
5702 | for many wireless networks, provided you give the actual SSID and | |
5703 | passphrase for the network you are connecting to: | |
5704 | ||
5705 | @example | |
5706 | network=@{ | |
5707 | ssid=@var{my-ssid} | |
5708 | key_mgmt=WPA-PSK | |
5709 | psk="the network's secret passphrase" | |
5710 | @} | |
5711 | @end example | |
5712 | ||
5713 | Start the wireless service and run it in the background with the | |
5714 | following command (substitute @var{interface} with the name of the | |
5715 | network interface you want to use): | |
5716 | ||
5717 | @example | |
5718 | wpa_supplicant -c wpa_supplicant.conf -i @var{interface} -B | |
5719 | @end example | |
5720 | ||
5721 | Run @command{man wpa_supplication} for more information. | |
5722 | @end table | |
5723 | ||
5724 | At this point, you need to acquire an IP address. On a network where IP | |
5725 | addresses are automatically assigned @i{via} DHCP, you can run: | |
5726 | ||
5727 | @example | |
5728 | dhclient @var{interface} | |
5729 | @end example | |
5af6de3e | 5730 | |
dedb8d5e LC |
5731 | Try to ping a server to see if networking is up and running: |
5732 | ||
5733 | @example | |
5734 | ping -c 3 gnu.org | |
5735 | @end example | |
5af6de3e LC |
5736 | |
5737 | Setting up network access is almost always a requirement because the | |
5738 | image does not contain all the software and tools that may be needed. | |
5739 | ||
dedb8d5e LC |
5740 | @subsubsection Disk Partitioning |
5741 | ||
5742 | Unless this has already been done, the next step is to partition, and | |
5743 | then format the target partition(s). | |
5744 | ||
5745 | The installation image includes several partitioning tools, including | |
5746 | Parted (@pxref{Overview,,, parted, GNU Parted User Manual}), | |
5747 | @command{fdisk}, and @command{cfdisk}. Run it and set up your disk with | |
5748 | the partition layout you want: | |
5749 | ||
5750 | @example | |
5751 | cfdisk | |
5752 | @end example | |
5753 | ||
5754 | Once you are done partitioning the target hard disk drive, you have to | |
5755 | create a file system on the relevant partition(s)@footnote{Currently | |
5756 | GuixSD pretty much assumes an ext4 file system. In particular, code | |
5757 | that reads partition UUIDs and labels only works with ext4. This will | |
5758 | be fixed in the future.}. | |
5af6de3e | 5759 | |
7ab44369 LC |
5760 | Preferably, assign partitions a label so that you can easily and |
5761 | reliably refer to them in @code{file-system} declarations (@pxref{File | |
5762 | Systems}). This is typically done using the @code{-L} option of | |
dedb8d5e LC |
5763 | @command{mkfs.ext4} and related commands. So, assuming the target root |
5764 | partition lives at @file{/dev/sda1}, a file system with the label | |
5765 | @code{my-root} can be created with: | |
7ab44369 | 5766 | |
dedb8d5e LC |
5767 | @example |
5768 | mkfs.ext4 -L my-root /dev/sda1 | |
5769 | @end example | |
dd816355 | 5770 | |
316d65be LC |
5771 | @c FIXME: Uncomment this once GRUB fully supports encrypted roots. |
5772 | @c A typical command sequence may be: | |
5773 | @c | |
5774 | @c @example | |
5775 | @c # fdisk /dev/sdX | |
5776 | @c @dots{} Create partitions etc.@dots{} | |
5777 | @c # cryptsetup luksFormat /dev/sdX1 | |
5778 | @c # cryptsetup open --type luks /dev/sdX1 my-partition | |
5779 | @c # mkfs.ext4 -L my-root /dev/mapper/my-partition | |
5780 | @c @end example | |
6d6e6281 | 5781 | |
dedb8d5e LC |
5782 | In addition to e2fsprogs, the suite of tools to manipulate |
5783 | ext2/ext3/ext4 file systems, the installation image includes | |
5784 | Cryptsetup/LUKS for disk encryption. | |
5af6de3e | 5785 | |
dedb8d5e LC |
5786 | Once that is done, mount the target root partition under @file{/mnt} |
5787 | with a command like (again, assuming @file{/dev/sda1} is the root | |
5788 | partition): | |
83a17b62 | 5789 | |
dedb8d5e LC |
5790 | @example |
5791 | mount /dev/sda1 /mnt | |
5792 | @end example | |
83a17b62 | 5793 | |
dedb8d5e LC |
5794 | @node Proceeding with the Installation |
5795 | @subsection Proceeding with the Installation | |
83a17b62 | 5796 | |
dedb8d5e LC |
5797 | With the target partitions ready and the target root mounted on |
5798 | @file{/mnt}, we're ready to go. First, run: | |
5af6de3e | 5799 | |
dedb8d5e LC |
5800 | @example |
5801 | herd start cow-store /mnt | |
5802 | @end example | |
5af6de3e | 5803 | |
dedb8d5e LC |
5804 | This makes @file{/gnu/store} copy-on-write, such that packages added to |
5805 | it during the installation phase are written to the target disk rather | |
5806 | than kept in memory. | |
5af6de3e | 5807 | |
dedb8d5e | 5808 | Next, you have to edit a file and |
5af6de3e LC |
5809 | provide the declaration of the operating system to be installed. To |
5810 | that end, the installation system comes with two text editors: GNU nano | |
5811 | (@pxref{Top,,, nano, GNU nano Manual}), and GNU Zile, an Emacs clone. | |
5812 | It is better to store that file on the target root file system, say, as | |
5813 | @file{/mnt/etc/config.scm}. | |
5814 | ||
dedb8d5e LC |
5815 | @xref{Using the Configuration System}, for an overview of the |
5816 | configuration file. The example configurations discussed in that | |
5817 | section are available under @file{/etc/configuration} in the | |
5818 | installation image. Thus, to get started with a system configuration | |
5819 | providing a graphical display server (a ``desktop'' system), you can run | |
5820 | something along these lines: | |
5821 | ||
5822 | @example | |
5823 | # mkdir /mnt/etc | |
5824 | # cp /etc/configuration/desktop.scm /mnt/etc/config.scm | |
5825 | # zile /mnt/etc/config.scm | |
5826 | @end example | |
5827 | ||
5828 | You should pay attention to what your configuration file contains, and | |
5829 | in particular: | |
5830 | ||
5831 | @itemize | |
5832 | @item | |
5833 | Make sure the @code{grub-configuration} form refers to the device you | |
5834 | want to install GRUB on. | |
5835 | ||
5836 | @item | |
5837 | Be sure that your partition labels match the value of their respective | |
5838 | @code{device} fields in your @code{file-system} configuration, assuming | |
5839 | your @code{file-system} configuration sets the value of @code{title} to | |
5840 | @code{'label}. | |
5841 | @end itemize | |
5af6de3e | 5842 | |
dd51caac LC |
5843 | Once you are done preparing the configuration file, the new system must |
5844 | be initialized (remember that the target root file system is mounted | |
5845 | under @file{/mnt}): | |
5af6de3e LC |
5846 | |
5847 | @example | |
5848 | guix system init /mnt/etc/config.scm /mnt | |
5849 | @end example | |
5850 | ||
5851 | @noindent | |
dedb8d5e | 5852 | This copies all the necessary files and installs GRUB on |
5af6de3e | 5853 | @file{/dev/sdX}, unless you pass the @option{--no-grub} option. For |
6621cdb6 | 5854 | more information, @pxref{Invoking guix system}. This command may trigger |
5af6de3e LC |
5855 | downloads or builds of missing packages, which can take some time. |
5856 | ||
1bd4e6db LC |
5857 | Once that command has completed---and hopefully succeeded!---you can run |
5858 | @command{reboot} and boot into the new system. The @code{root} password | |
5859 | in the new system is initially empty; other users' passwords need to be | |
5860 | initialized by running the @command{passwd} command as @code{root}, | |
5861 | unless your configuration specifies otherwise | |
5862 | (@pxref{user-account-password, user account passwords}). | |
5863 | ||
5864 | Join us on @code{#guix} on the Freenode IRC network or on | |
5af6de3e LC |
5865 | @file{guix-devel@@gnu.org} to share your experience---good or not so |
5866 | good. | |
5867 | ||
dedb8d5e | 5868 | @node Building the Installation Image |
5af6de3e LC |
5869 | @subsection Building the Installation Image |
5870 | ||
5871 | The installation image described above was built using the @command{guix | |
5872 | system} command, specifically: | |
5873 | ||
5874 | @example | |
8a225c66 | 5875 | guix system disk-image --image-size=850MiB gnu/system/install.scm |
5af6de3e LC |
5876 | @end example |
5877 | ||
5878 | @xref{Invoking guix system}, for more information. See | |
5879 | @file{gnu/system/install.scm} in the source tree for more information | |
5880 | about the installation image. | |
5881 | ||
cf4a9129 LC |
5882 | @node System Configuration |
5883 | @section System Configuration | |
b208a005 | 5884 | |
cf4a9129 | 5885 | @cindex system configuration |
3ca2731c | 5886 | The Guix System Distribution supports a consistent whole-system configuration |
cf4a9129 LC |
5887 | mechanism. By that we mean that all aspects of the global system |
5888 | configuration---such as the available system services, timezone and | |
5889 | locale settings, user accounts---are declared in a single place. Such | |
5890 | a @dfn{system configuration} can be @dfn{instantiated}---i.e., effected. | |
91ef73d4 | 5891 | |
cf4a9129 LC |
5892 | One of the advantages of putting all the system configuration under the |
5893 | control of Guix is that it supports transactional system upgrades, and | |
5894 | makes it possible to roll-back to a previous system instantiation, | |
5895 | should something go wrong with the new one (@pxref{Features}). Another | |
5896 | one is that it makes it easy to replicate the exact same configuration | |
5897 | across different machines, or at different points in time, without | |
5898 | having to resort to additional administration tools layered on top of | |
5899 | the system's own tools. | |
5900 | @c Yes, we're talking of Puppet, Chef, & co. here. ↑ | |
91ef73d4 | 5901 | |
cf4a9129 LC |
5902 | This section describes this mechanism. First we focus on the system |
5903 | administrator's viewpoint---explaining how the system is configured and | |
5904 | instantiated. Then we show how this mechanism can be extended, for | |
5905 | instance to support new system services. | |
91ef73d4 | 5906 | |
cf4a9129 LC |
5907 | @menu |
5908 | * Using the Configuration System:: Customizing your GNU system. | |
7313a52e | 5909 | * operating-system Reference:: Detail of operating-system declarations. |
cf4a9129 | 5910 | * File Systems:: Configuring file system mounts. |
510f9d86 | 5911 | * Mapped Devices:: Block device extra processing. |
cf4a9129 | 5912 | * User Accounts:: Specifying user accounts. |
598e19dc | 5913 | * Locales:: Language and cultural convention settings. |
cf4a9129 | 5914 | * Services:: Specifying system services. |
0ae8c15a | 5915 | * Setuid Programs:: Programs running with root privileges. |
efb5e833 | 5916 | * X.509 Certificates:: Authenticating HTTPS servers. |
996ed739 | 5917 | * Name Service Switch:: Configuring libc's name service switch. |
fd1b1fa2 | 5918 | * Initial RAM Disk:: Linux-Libre bootstrapping. |
88faf933 | 5919 | * GRUB Configuration:: Configuring the boot loader. |
cf4a9129 | 5920 | * Invoking guix system:: Instantiating a system configuration. |
97d76250 | 5921 | * Running GuixSD in a VM:: How to run GuixSD in a virtual machine. |
cf4a9129 LC |
5922 | * Defining Services:: Adding new service definitions. |
5923 | @end menu | |
91ef73d4 | 5924 | |
cf4a9129 LC |
5925 | @node Using the Configuration System |
5926 | @subsection Using the Configuration System | |
64d76fa6 | 5927 | |
cf4a9129 LC |
5928 | The operating system is configured by providing an |
5929 | @code{operating-system} declaration in a file that can then be passed to | |
5930 | the @command{guix system} command (@pxref{Invoking guix system}). A | |
5931 | simple setup, with the default system services, the default Linux-Libre | |
5932 | kernel, initial RAM disk, and boot loader looks like this: | |
91ef73d4 | 5933 | |
cf4a9129 LC |
5934 | @findex operating-system |
5935 | @lisp | |
dd51caac | 5936 | @include os-config-bare-bones.texi |
cf4a9129 | 5937 | @end lisp |
401c53c4 | 5938 | |
cf4a9129 LC |
5939 | This example should be self-describing. Some of the fields defined |
5940 | above, such as @code{host-name} and @code{bootloader}, are mandatory. | |
5941 | Others, such as @code{packages} and @code{services}, can be omitted, in | |
5942 | which case they get a default value. | |
e7f34eb0 | 5943 | |
5d94ac51 LC |
5944 | Below we discuss the effect of some of the most important fields |
5945 | (@pxref{operating-system Reference}, for details about all the available | |
5946 | fields), and how to @dfn{instantiate} the operating system using | |
5947 | @command{guix system}. | |
5948 | ||
5949 | @unnumberedsubsubsec Globally-Visible Packages | |
5950 | ||
cf4a9129 | 5951 | @vindex %base-packages |
5d94ac51 LC |
5952 | The @code{packages} field lists packages that will be globally visible |
5953 | on the system, for all user accounts---i.e., in every user's @code{PATH} | |
5954 | environment variable---in addition to the per-user profiles | |
5955 | (@pxref{Invoking guix package}). The @var{%base-packages} variable | |
5956 | provides all the tools one would expect for basic user and administrator | |
5957 | tasks---including the GNU Core Utilities, the GNU Networking Utilities, | |
5958 | the GNU Zile lightweight text editor, @command{find}, @command{grep}, | |
5959 | etc. The example above adds tcpdump to those, taken from the @code{(gnu | |
5960 | packages admin)} module (@pxref{Package Modules}). | |
e7f34eb0 | 5961 | |
f6c9fb1b LC |
5962 | @findex specification->package |
5963 | Referring to packages by variable name, like @var{tcpdump} above, has | |
5964 | the advantage of being unambiguous; it also allows typos and such to be | |
5965 | diagnosed right away as ``unbound variables''. The downside is that one | |
5966 | needs to know which module defines which package, and to augment the | |
5967 | @code{use-package-modules} line accordingly. To avoid that, one can use | |
5968 | the @code{specification->package} procedure of the @code{(gnu packages)} | |
5969 | module, which returns the best package for a given name or name and | |
5970 | version: | |
5971 | ||
5972 | @lisp | |
5973 | (use-modules (gnu packages)) | |
5974 | ||
5975 | (operating-system | |
5976 | ;; ... | |
5977 | (packages (append (map specification->package | |
5978 | '("tcpdump" "htop" "gnupg-2.0")) | |
5979 | %base-packages))) | |
5980 | @end lisp | |
5981 | ||
5d94ac51 LC |
5982 | @unnumberedsubsubsec System Services |
5983 | ||
cf4a9129 LC |
5984 | @vindex %base-services |
5985 | The @code{services} field lists @dfn{system services} to be made | |
5986 | available when the system starts (@pxref{Services}). | |
5987 | The @code{operating-system} declaration above specifies that, in | |
5988 | addition to the basic services, we want the @command{lshd} secure shell | |
cd6f6c22 LC |
5989 | daemon listening on port 2222 (@pxref{Networking Services, |
5990 | @code{lsh-service}}). Under the hood, | |
cf4a9129 LC |
5991 | @code{lsh-service} arranges so that @code{lshd} is started with the |
5992 | right command-line options, possibly with supporting configuration files | |
cd6f6c22 LC |
5993 | generated as needed (@pxref{Defining Services}). |
5994 | ||
5995 | @cindex customization, of services | |
5996 | @findex modify-services | |
5997 | Occasionally, instead of using the base services as is, you will want to | |
5998 | customize them. For instance, to change the configuration of | |
5999 | @code{guix-daemon} and Mingetty (the console log-in), you may write the | |
6000 | following instead of @var{%base-services}: | |
6001 | ||
6002 | @lisp | |
6003 | (modify-services %base-services | |
6004 | (guix-service-type config => | |
6005 | (guix-configuration | |
6006 | (inherit config) | |
6007 | (use-substitutes? #f) | |
6008 | (extra-options '("--gc-keep-outputs")))) | |
6009 | (mingetty-service-type config => | |
6010 | (mingetty-configuration | |
6011 | (inherit config) | |
6012 | (motd (plain-file "motd" "Hi there!"))))) | |
6013 | @end lisp | |
6014 | ||
6015 | @noindent | |
6016 | The effect here is to change the options passed to @command{guix-daemon} | |
6017 | when it is started, as well as the ``message of the day'' that appears | |
6018 | when logging in at the console. @xref{Service Reference, | |
6019 | @code{modify-services}}, for more on that. | |
a1ba8475 | 6020 | |
dd51caac | 6021 | The configuration for a typical ``desktop'' usage, with the X11 display |
cd6f6c22 | 6022 | server, a desktop environment, network management, power management, and |
dd51caac LC |
6023 | more, would look like this: |
6024 | ||
6025 | @lisp | |
6026 | @include os-config-desktop.texi | |
6027 | @end lisp | |
6028 | ||
6029 | @xref{Desktop Services}, for the exact list of services provided by | |
efb5e833 LC |
6030 | @var{%desktop-services}. @xref{X.509 Certificates}, for background |
6031 | information about the @code{nss-certs} package that is used here. | |
dd51caac | 6032 | |
5d94ac51 LC |
6033 | Again, @var{%desktop-services} is just a list of service objects. If |
6034 | you want to remove services from there, you can do so using the | |
6035 | procedures for list filtering (@pxref{SRFI-1 Filtering and | |
6036 | Partitioning,,, guile, GNU Guile Reference Manual}). For instance, the | |
6037 | following expression returns a list that contains all the services in | |
6038 | @var{%desktop-services} minus the Avahi service: | |
6039 | ||
6040 | @example | |
6041 | (remove (lambda (service) | |
6042 | (eq? (service-kind service) avahi-service-type)) | |
6043 | %desktop-services) | |
6044 | @end example | |
6045 | ||
6046 | @unnumberedsubsubsec Instantiating the System | |
6047 | ||
6048 | Assuming the @code{operating-system} declaration | |
6049 | is stored in the @file{my-system-config.scm} | |
cf4a9129 LC |
6050 | file, the @command{guix system reconfigure my-system-config.scm} command |
6051 | instantiates that configuration, and makes it the default GRUB boot | |
65797bff LC |
6052 | entry (@pxref{Invoking guix system}). |
6053 | ||
6054 | The normal way to change the system's configuration is by updating this | |
6055 | file and re-running @command{guix system reconfigure}. One should never | |
6056 | have to touch files in @command{/etc} or to run commands that modify the | |
6057 | system state such as @command{useradd} or @command{grub-install}. In | |
6058 | fact, you must avoid that since that would not only void your warranty | |
6059 | but also prevent you from rolling back to previous versions of your | |
6060 | system, should you ever need to. | |
6061 | ||
6062 | @cindex roll-back, of the operating system | |
6063 | Speaking of roll-back, each time you run @command{guix system | |
6064 | reconfigure}, a new @dfn{generation} of the system is created---without | |
6065 | modifying or deleting previous generations. Old system generations get | |
6066 | an entry in the GRUB boot menu, allowing you to boot them in case | |
6067 | something went wrong with the latest generation. Reassuring, no? The | |
6068 | @command{guix system list-generations} command lists the system | |
6069 | generations available on disk. | |
b81e1947 | 6070 | |
5d94ac51 LC |
6071 | @unnumberedsubsubsec The Programming Interface |
6072 | ||
cf4a9129 LC |
6073 | At the Scheme level, the bulk of an @code{operating-system} declaration |
6074 | is instantiated with the following monadic procedure (@pxref{The Store | |
6075 | Monad}): | |
b81e1947 | 6076 | |
cf4a9129 LC |
6077 | @deffn {Monadic Procedure} operating-system-derivation os |
6078 | Return a derivation that builds @var{os}, an @code{operating-system} | |
6079 | object (@pxref{Derivations}). | |
b81e1947 | 6080 | |
cf4a9129 LC |
6081 | The output of the derivation is a single directory that refers to all |
6082 | the packages, configuration files, and other supporting files needed to | |
6083 | instantiate @var{os}. | |
6084 | @end deffn | |
b81e1947 | 6085 | |
5d94ac51 LC |
6086 | This procedure is provided by the @code{(gnu system)} module. Along |
6087 | with @code{(gnu services)} (@pxref{Services}), this module contains the | |
6088 | guts of GuixSD. Make sure to visit it! | |
6089 | ||
6090 | ||
7313a52e LC |
6091 | @node operating-system Reference |
6092 | @subsection @code{operating-system} Reference | |
6093 | ||
6094 | This section summarizes all the options available in | |
6095 | @code{operating-system} declarations (@pxref{Using the Configuration | |
6096 | System}). | |
6097 | ||
6098 | @deftp {Data Type} operating-system | |
6099 | This is the data type representing an operating system configuration. | |
6100 | By that, we mean all the global system configuration, not per-user | |
6101 | configuration (@pxref{Using the Configuration System}). | |
6102 | ||
6103 | @table @asis | |
6104 | @item @code{kernel} (default: @var{linux-libre}) | |
fbb25e56 | 6105 | The package object of the operating system kernel to use@footnote{Currently |
7313a52e LC |
6106 | only the Linux-libre kernel is supported. In the future, it will be |
6107 | possible to use the GNU@tie{}Hurd.}. | |
6108 | ||
ee2a6304 LC |
6109 | @item @code{kernel-arguments} (default: @code{'()}) |
6110 | List of strings or gexps representing additional arguments to pass on | |
6111 | the kernel's command-line---e.g., @code{("console=ttyS0")}. | |
6112 | ||
7313a52e | 6113 | @item @code{bootloader} |
88faf933 | 6114 | The system bootloader configuration object. @xref{GRUB Configuration}. |
7313a52e LC |
6115 | |
6116 | @item @code{initrd} (default: @code{base-initrd}) | |
6117 | A two-argument monadic procedure that returns an initial RAM disk for | |
6118 | the Linux kernel. @xref{Initial RAM Disk}. | |
6119 | ||
f34c56be LC |
6120 | @item @code{firmware} (default: @var{%base-firmware}) |
6121 | @cindex firmware | |
6122 | List of firmware packages loadable by the operating system kernel. | |
6123 | ||
6124 | The default includes firmware needed for Atheros-based WiFi devices | |
6125 | (Linux-libre module @code{ath9k}.) | |
6126 | ||
7313a52e LC |
6127 | @item @code{host-name} |
6128 | The host name. | |
6129 | ||
6130 | @item @code{hosts-file} | |
6131 | @cindex hosts file | |
24e02c28 | 6132 | A file-like object (@pxref{G-Expressions, file-like objects}) for use as |
7313a52e | 6133 | @file{/etc/hosts} (@pxref{Host Names,,, libc, The GNU C Library |
24e02c28 | 6134 | Reference Manual}). The default is a file with entries for |
7313a52e LC |
6135 | @code{localhost} and @var{host-name}. |
6136 | ||
6137 | @item @code{mapped-devices} (default: @code{'()}) | |
6138 | A list of mapped devices. @xref{Mapped Devices}. | |
6139 | ||
6140 | @item @code{file-systems} | |
6141 | A list of file systems. @xref{File Systems}. | |
6142 | ||
6143 | @item @code{swap-devices} (default: @code{'()}) | |
6144 | @cindex swap devices | |
6145 | A list of strings identifying devices to be used for ``swap space'' | |
6146 | (@pxref{Memory Concepts,,, libc, The GNU C Library Reference Manual}). | |
6147 | For example, @code{'("/dev/sda3")}. | |
6148 | ||
bf87f38a | 6149 | @item @code{users} (default: @code{%base-user-accounts}) |
7313a52e LC |
6150 | @itemx @code{groups} (default: @var{%base-groups}) |
6151 | List of user accounts and groups. @xref{User Accounts}. | |
6152 | ||
6153 | @item @code{skeletons} (default: @code{(default-skeletons)}) | |
6154 | A monadic list of pairs of target file name and files. These are the | |
6155 | files that will be used as skeletons as new accounts are created. | |
6156 | ||
6157 | For instance, a valid value may look like this: | |
6158 | ||
6159 | @example | |
6160 | (mlet %store-monad ((bashrc (text-file "bashrc" "\ | |
6161 | export PATH=$HOME/.guix-profile/bin"))) | |
6162 | (return `((".bashrc" ,bashrc)))) | |
6163 | @end example | |
6164 | ||
6165 | @item @code{issue} (default: @var{%default-issue}) | |
6166 | A string denoting the contents of the @file{/etc/issue} file, which is | |
6167 | what displayed when users log in on a text console. | |
6168 | ||
6169 | @item @code{packages} (default: @var{%base-packages}) | |
6170 | The set of packages installed in the global profile, which is accessible | |
6171 | at @file{/run/current-system/profile}. | |
6172 | ||
6173 | The default set includes core utilities, but it is good practice to | |
6174 | install non-core utilities in user profiles (@pxref{Invoking guix | |
6175 | package}). | |
6176 | ||
6177 | @item @code{timezone} | |
6178 | A timezone identifying string---e.g., @code{"Europe/Paris"}. | |
6179 | ||
17c20385 LC |
6180 | You can run the @command{tzselect} command to find out which timezone |
6181 | string corresponds to your region. Choosing an invalid timezone name | |
6182 | causes @command{guix system} to fail. | |
6183 | ||
598e19dc LC |
6184 | @item @code{locale} (default: @code{"en_US.utf8"}) |
6185 | The name of the default locale (@pxref{Locale Names,,, libc, The GNU C | |
6186 | Library Reference Manual}). @xref{Locales}, for more information. | |
6187 | ||
6188 | @item @code{locale-definitions} (default: @var{%default-locale-definitions}) | |
6189 | The list of locale definitions to be compiled and that may be used at | |
6190 | run time. @xref{Locales}. | |
7313a52e | 6191 | |
34760ae7 LC |
6192 | @item @code{locale-libcs} (default: @code{(list @var{glibc})}) |
6193 | The list of GNU@tie{}libc packages whose locale data and tools are used | |
6194 | to build the locale definitions. @xref{Locales}, for compatibility | |
6195 | considerations that justify this option. | |
6196 | ||
996ed739 LC |
6197 | @item @code{name-service-switch} (default: @var{%default-nss}) |
6198 | Configuration of libc's name service switch (NSS)---a | |
6199 | @code{<name-service-switch>} object. @xref{Name Service Switch}, for | |
6200 | details. | |
6201 | ||
7313a52e | 6202 | @item @code{services} (default: @var{%base-services}) |
28d939af | 6203 | A list of service objects denoting system services. @xref{Services}. |
7313a52e LC |
6204 | |
6205 | @item @code{pam-services} (default: @code{(base-pam-services)}) | |
6206 | @cindex PAM | |
6207 | @cindex pluggable authentication modules | |
6208 | Linux @dfn{pluggable authentication module} (PAM) services. | |
6209 | @c FIXME: Add xref to PAM services section. | |
6210 | ||
6211 | @item @code{setuid-programs} (default: @var{%setuid-programs}) | |
6212 | List of string-valued G-expressions denoting setuid programs. | |
6213 | @xref{Setuid Programs}. | |
6214 | ||
f5a9ffa0 AK |
6215 | @item @code{sudoers-file} (default: @var{%sudoers-specification}) |
6216 | @cindex sudoers file | |
84765839 LC |
6217 | The contents of the @file{/etc/sudoers} file as a file-like object |
6218 | (@pxref{G-Expressions, @code{local-file} and @code{plain-file}}). | |
7313a52e LC |
6219 | |
6220 | This file specifies which users can use the @command{sudo} command, what | |
6221 | they are allowed to do, and what privileges they may gain. The default | |
6222 | is that only @code{root} and members of the @code{wheel} group may use | |
6223 | @code{sudo}. | |
6224 | ||
6225 | @end table | |
6226 | @end deftp | |
6227 | ||
cf4a9129 LC |
6228 | @node File Systems |
6229 | @subsection File Systems | |
b81e1947 | 6230 | |
cf4a9129 LC |
6231 | The list of file systems to be mounted is specified in the |
6232 | @code{file-systems} field of the operating system's declaration | |
6233 | (@pxref{Using the Configuration System}). Each file system is declared | |
6234 | using the @code{file-system} form, like this: | |
b81e1947 LC |
6235 | |
6236 | @example | |
cf4a9129 LC |
6237 | (file-system |
6238 | (mount-point "/home") | |
6239 | (device "/dev/sda3") | |
6240 | (type "ext4")) | |
b81e1947 LC |
6241 | @end example |
6242 | ||
cf4a9129 LC |
6243 | As usual, some of the fields are mandatory---those shown in the example |
6244 | above---while others can be omitted. These are described below. | |
b81e1947 | 6245 | |
cf4a9129 LC |
6246 | @deftp {Data Type} file-system |
6247 | Objects of this type represent file systems to be mounted. They | |
6248 | contain the following members: | |
5ff3c4b8 | 6249 | |
cf4a9129 LC |
6250 | @table @asis |
6251 | @item @code{type} | |
6252 | This is a string specifying the type of the file system---e.g., | |
6253 | @code{"ext4"}. | |
5ff3c4b8 | 6254 | |
cf4a9129 LC |
6255 | @item @code{mount-point} |
6256 | This designates the place where the file system is to be mounted. | |
b81e1947 | 6257 | |
cf4a9129 LC |
6258 | @item @code{device} |
6259 | This names the ``source'' of the file system. By default it is the name | |
6260 | of a node under @file{/dev}, but its meaning depends on the @code{title} | |
6261 | field described below. | |
401c53c4 | 6262 | |
cf4a9129 LC |
6263 | @item @code{title} (default: @code{'device}) |
6264 | This is a symbol that specifies how the @code{device} field is to be | |
6265 | interpreted. | |
401c53c4 | 6266 | |
cf4a9129 LC |
6267 | When it is the symbol @code{device}, then the @code{device} field is |
6268 | interpreted as a file name; when it is @code{label}, then @code{device} | |
6269 | is interpreted as a partition label name; when it is @code{uuid}, | |
6270 | @code{device} is interpreted as a partition unique identifier (UUID). | |
da7cabd4 | 6271 | |
661a1d79 LC |
6272 | UUIDs may be converted from their string representation (as shown by the |
6273 | @command{tune2fs -l} command) using the @code{uuid} form, like this: | |
6274 | ||
6275 | @example | |
6276 | (file-system | |
6277 | (mount-point "/home") | |
6278 | (type "ext4") | |
6279 | (title 'uuid) | |
6280 | (device (uuid "4dab5feb-d176-45de-b287-9b0a6e4c01cb"))) | |
6281 | @end example | |
6282 | ||
cf4a9129 | 6283 | The @code{label} and @code{uuid} options offer a way to refer to disk |
661a1d79 LC |
6284 | partitions without having to hard-code their actual device |
6285 | name@footnote{Note that, while it is tempting to use | |
6286 | @file{/dev/disk/by-uuid} and similar device names to achieve the same | |
6287 | result, this is not recommended: These special device nodes are created | |
6288 | by the udev daemon and may be unavailable at the time the device is | |
6289 | mounted.}. | |
da7cabd4 | 6290 | |
5f86a66e LC |
6291 | However, when a file system's source is a mapped device (@pxref{Mapped |
6292 | Devices}), its @code{device} field @emph{must} refer to the mapped | |
6293 | device name---e.g., @file{/dev/mapper/root-partition}---and consequently | |
6294 | @code{title} must be set to @code{'device}. This is required so that | |
6295 | the system knows that mounting the file system depends on having the | |
6296 | corresponding device mapping established. | |
6297 | ||
cf4a9129 LC |
6298 | @item @code{flags} (default: @code{'()}) |
6299 | This is a list of symbols denoting mount flags. Recognized flags | |
2c071ce9 LC |
6300 | include @code{read-only}, @code{bind-mount}, @code{no-dev} (disallow |
6301 | access to special files), @code{no-suid} (ignore setuid and setgid | |
6302 | bits), and @code{no-exec} (disallow program execution.) | |
da7cabd4 | 6303 | |
cf4a9129 LC |
6304 | @item @code{options} (default: @code{#f}) |
6305 | This is either @code{#f}, or a string denoting mount options. | |
da7cabd4 | 6306 | |
be21979d LC |
6307 | @item @code{mount?} (default: @code{#t}) |
6308 | This value indicates whether to automatically mount the file system when | |
6309 | the system is brought up. When set to @code{#f}, the file system gets | |
6310 | an entry in @file{/etc/fstab} (read by the @command{mount} command) but | |
6311 | is not automatically mounted. | |
6312 | ||
cf4a9129 LC |
6313 | @item @code{needed-for-boot?} (default: @code{#f}) |
6314 | This Boolean value indicates whether the file system is needed when | |
6315 | booting. If that is true, then the file system is mounted when the | |
6316 | initial RAM disk (initrd) is loaded. This is always the case, for | |
6317 | instance, for the root file system. | |
da7cabd4 | 6318 | |
cf4a9129 LC |
6319 | @item @code{check?} (default: @code{#t}) |
6320 | This Boolean indicates whether the file system needs to be checked for | |
6321 | errors before being mounted. | |
f9cc8971 | 6322 | |
4e469051 LC |
6323 | @item @code{create-mount-point?} (default: @code{#f}) |
6324 | When true, the mount point is created if it does not exist yet. | |
6325 | ||
e51710d1 LC |
6326 | @item @code{dependencies} (default: @code{'()}) |
6327 | This is a list of @code{<file-system>} objects representing file systems | |
6328 | that must be mounted before (and unmounted after) this one. | |
6329 | ||
6330 | As an example, consider a hierarchy of mounts: @file{/sys/fs/cgroup} is | |
6331 | a dependency of @file{/sys/fs/cgroup/cpu} and | |
6332 | @file{/sys/fs/cgroup/memory}. | |
6333 | ||
cf4a9129 LC |
6334 | @end table |
6335 | @end deftp | |
da7cabd4 | 6336 | |
a69576ea LC |
6337 | The @code{(gnu system file-systems)} exports the following useful |
6338 | variables. | |
6339 | ||
6340 | @defvr {Scheme Variable} %base-file-systems | |
6341 | These are essential file systems that are required on normal systems, | |
cc0e575a | 6342 | such as @var{%pseudo-terminal-file-system} and @var{%immutable-store} (see |
3392ce5d LC |
6343 | below.) Operating system declarations should always contain at least |
6344 | these. | |
a69576ea LC |
6345 | @end defvr |
6346 | ||
7f239fd3 LC |
6347 | @defvr {Scheme Variable} %pseudo-terminal-file-system |
6348 | This is the file system to be mounted as @file{/dev/pts}. It supports | |
6349 | @dfn{pseudo-terminals} created @i{via} @code{openpty} and similar | |
6350 | functions (@pxref{Pseudo-Terminals,,, libc, The GNU C Library Reference | |
6351 | Manual}). Pseudo-terminals are used by terminal emulators such as | |
6352 | @command{xterm}. | |
6353 | @end defvr | |
6354 | ||
db17ae5c LC |
6355 | @defvr {Scheme Variable} %shared-memory-file-system |
6356 | This file system is mounted as @file{/dev/shm} and is used to support | |
6357 | memory sharing across processes (@pxref{Memory-mapped I/O, | |
6358 | @code{shm_open},, libc, The GNU C Library Reference Manual}). | |
6359 | @end defvr | |
6360 | ||
3392ce5d LC |
6361 | @defvr {Scheme Variable} %immutable-store |
6362 | This file system performs a read-only ``bind mount'' of | |
6363 | @file{/gnu/store}, making it read-only for all the users including | |
6364 | @code{root}. This prevents against accidental modification by software | |
6365 | running as @code{root} or by system administrators. | |
6366 | ||
6367 | The daemon itself is still able to write to the store: it remounts it | |
6368 | read-write in its own ``name space.'' | |
6369 | @end defvr | |
6370 | ||
a69576ea LC |
6371 | @defvr {Scheme Variable} %binary-format-file-system |
6372 | The @code{binfmt_misc} file system, which allows handling of arbitrary | |
6373 | executable file types to be delegated to user space. This requires the | |
6374 | @code{binfmt.ko} kernel module to be loaded. | |
6375 | @end defvr | |
6376 | ||
6377 | @defvr {Scheme Variable} %fuse-control-file-system | |
6378 | The @code{fusectl} file system, which allows unprivileged users to mount | |
6379 | and unmount user-space FUSE file systems. This requires the | |
6380 | @code{fuse.ko} kernel module to be loaded. | |
6381 | @end defvr | |
6382 | ||
510f9d86 LC |
6383 | @node Mapped Devices |
6384 | @subsection Mapped Devices | |
6385 | ||
6386 | @cindex device mapping | |
6387 | @cindex mapped devices | |
6388 | The Linux kernel has a notion of @dfn{device mapping}: a block device, | |
6389 | such as a hard disk partition, can be @dfn{mapped} into another device, | |
6390 | with additional processing over the data that flows through | |
6391 | it@footnote{Note that the GNU@tie{}Hurd makes no difference between the | |
6392 | concept of a ``mapped device'' and that of a file system: both boil down | |
6393 | to @emph{translating} input/output operations made on a file to | |
6394 | operations on its backing store. Thus, the Hurd implements mapped | |
6395 | devices, like file systems, using the generic @dfn{translator} mechanism | |
6396 | (@pxref{Translators,,, hurd, The GNU Hurd Reference Manual}).}. A | |
6397 | typical example is encryption device mapping: all writes to the mapped | |
6398 | device are encrypted, and all reads are deciphered, transparently. | |
6399 | ||
6400 | Mapped devices are declared using the @code{mapped-device} form: | |
6401 | ||
6402 | @example | |
6403 | (mapped-device | |
6404 | (source "/dev/sda3") | |
6405 | (target "home") | |
6406 | (type luks-device-mapping)) | |
6407 | @end example | |
6408 | ||
6409 | @noindent | |
6410 | @cindex disk encryption | |
6411 | @cindex LUKS | |
6412 | This example specifies a mapping from @file{/dev/sda3} to | |
6413 | @file{/dev/mapper/home} using LUKS---the | |
6414 | @url{http://code.google.com/p/cryptsetup,Linux Unified Key Setup}, a | |
6415 | standard mechanism for disk encryption. The @file{/dev/mapper/home} | |
6416 | device can then be used as the @code{device} of a @code{file-system} | |
6417 | declaration (@pxref{File Systems}). The @code{mapped-device} form is | |
6418 | detailed below. | |
6419 | ||
6420 | @deftp {Data Type} mapped-device | |
6421 | Objects of this type represent device mappings that will be made when | |
6422 | the system boots up. | |
6423 | ||
9cb426b8 LC |
6424 | @table @code |
6425 | @item source | |
510f9d86 LC |
6426 | This string specifies the name of the block device to be mapped, such as |
6427 | @code{"/dev/sda3"}. | |
6428 | ||
9cb426b8 | 6429 | @item target |
510f9d86 LC |
6430 | This string specifies the name of the mapping to be established. For |
6431 | example, specifying @code{"my-partition"} will lead to the creation of | |
6432 | the @code{"/dev/mapper/my-partition"} device. | |
6433 | ||
9cb426b8 | 6434 | @item type |
510f9d86 LC |
6435 | This must be a @code{mapped-device-kind} object, which specifies how |
6436 | @var{source} is mapped to @var{target}. | |
6437 | @end table | |
6438 | @end deftp | |
6439 | ||
6440 | @defvr {Scheme Variable} luks-device-mapping | |
6441 | This defines LUKS block device encryption using the @command{cryptsetup} | |
6442 | command, from the same-named package. This relies on the | |
6443 | @code{dm-crypt} Linux kernel module. | |
6444 | @end defvr | |
6445 | ||
cf4a9129 LC |
6446 | @node User Accounts |
6447 | @subsection User Accounts | |
ee85f3db | 6448 | |
9bea87a5 LC |
6449 | User accounts and groups are entirely managed through the |
6450 | @code{operating-system} declaration. They are specified with the | |
6451 | @code{user-account} and @code{user-group} forms: | |
ee85f3db | 6452 | |
cf4a9129 LC |
6453 | @example |
6454 | (user-account | |
6455 | (name "alice") | |
6456 | (group "users") | |
24e752c0 LC |
6457 | (supplementary-groups '("wheel" ;allow use of sudo, etc. |
6458 | "audio" ;sound card | |
6459 | "video" ;video devices such as webcams | |
6460 | "cdrom")) ;the good ol' CD-ROM | |
cf4a9129 LC |
6461 | (comment "Bob's sister") |
6462 | (home-directory "/home/alice")) | |
6463 | @end example | |
25083588 | 6464 | |
9bea87a5 LC |
6465 | When booting or upon completion of @command{guix system reconfigure}, |
6466 | the system ensures that only the user accounts and groups specified in | |
6467 | the @code{operating-system} declaration exist, and with the specified | |
6468 | properties. Thus, account or group creations or modifications made by | |
6469 | directly invoking commands such as @command{useradd} are lost upon | |
6470 | reconfiguration or reboot. This ensures that the system remains exactly | |
6471 | as declared. | |
6472 | ||
cf4a9129 LC |
6473 | @deftp {Data Type} user-account |
6474 | Objects of this type represent user accounts. The following members may | |
6475 | be specified: | |
ee85f3db | 6476 | |
cf4a9129 LC |
6477 | @table @asis |
6478 | @item @code{name} | |
6479 | The name of the user account. | |
ee85f3db | 6480 | |
cf4a9129 LC |
6481 | @item @code{group} |
6482 | This is the name (a string) or identifier (a number) of the user group | |
6483 | this account belongs to. | |
ee85f3db | 6484 | |
cf4a9129 LC |
6485 | @item @code{supplementary-groups} (default: @code{'()}) |
6486 | Optionally, this can be defined as a list of group names that this | |
6487 | account belongs to. | |
ee85f3db | 6488 | |
cf4a9129 LC |
6489 | @item @code{uid} (default: @code{#f}) |
6490 | This is the user ID for this account (a number), or @code{#f}. In the | |
6491 | latter case, a number is automatically chosen by the system when the | |
6492 | account is created. | |
ee85f3db | 6493 | |
cf4a9129 LC |
6494 | @item @code{comment} (default: @code{""}) |
6495 | A comment about the account, such as the account's owner full name. | |
c8c871d1 | 6496 | |
cf4a9129 LC |
6497 | @item @code{home-directory} |
6498 | This is the name of the home directory for the account. | |
ee85f3db | 6499 | |
cf4a9129 LC |
6500 | @item @code{shell} (default: Bash) |
6501 | This is a G-expression denoting the file name of a program to be used as | |
6502 | the shell (@pxref{G-Expressions}). | |
ee85f3db | 6503 | |
cf4a9129 LC |
6504 | @item @code{system?} (default: @code{#f}) |
6505 | This Boolean value indicates whether the account is a ``system'' | |
6506 | account. System accounts are sometimes treated specially; for instance, | |
6507 | graphical login managers do not list them. | |
ee85f3db | 6508 | |
1bd4e6db | 6509 | @anchor{user-account-password} |
cf4a9129 | 6510 | @item @code{password} (default: @code{#f}) |
eb59595c LC |
6511 | You would normally leave this field to @code{#f}, initialize user |
6512 | passwords as @code{root} with the @command{passwd} command, and then let | |
9bea87a5 LC |
6513 | users change it with @command{passwd}. Passwords set with |
6514 | @command{passwd} are of course preserved across reboot and | |
6515 | reconfiguration. | |
eb59595c LC |
6516 | |
6517 | If you @emph{do} want to have a preset password for an account, then | |
6518 | this field must contain the encrypted password, as a string. | |
5d1f1177 LC |
6519 | @xref{crypt,,, libc, The GNU C Library Reference Manual}, for more information |
6520 | on password encryption, and @ref{Encryption,,, guile, GNU Guile Reference | |
eb59595c | 6521 | Manual}, for information on Guile's @code{crypt} procedure. |
c8c871d1 | 6522 | |
cf4a9129 LC |
6523 | @end table |
6524 | @end deftp | |
ee85f3db | 6525 | |
cf4a9129 | 6526 | User group declarations are even simpler: |
ee85f3db | 6527 | |
cf4a9129 LC |
6528 | @example |
6529 | (user-group (name "students")) | |
6530 | @end example | |
ee85f3db | 6531 | |
cf4a9129 LC |
6532 | @deftp {Data Type} user-group |
6533 | This type is for, well, user groups. There are just a few fields: | |
af8a56b8 | 6534 | |
cf4a9129 LC |
6535 | @table @asis |
6536 | @item @code{name} | |
6537 | The group's name. | |
ee85f3db | 6538 | |
cf4a9129 LC |
6539 | @item @code{id} (default: @code{#f}) |
6540 | The group identifier (a number). If @code{#f}, a new number is | |
6541 | automatically allocated when the group is created. | |
ee85f3db | 6542 | |
c8fa3426 LC |
6543 | @item @code{system?} (default: @code{#f}) |
6544 | This Boolean value indicates whether the group is a ``system'' group. | |
6545 | System groups have low numerical IDs. | |
6546 | ||
cf4a9129 LC |
6547 | @item @code{password} (default: @code{#f}) |
6548 | What, user groups can have a password? Well, apparently yes. Unless | |
6549 | @code{#f}, this field specifies the group's password. | |
ee85f3db | 6550 | |
cf4a9129 LC |
6551 | @end table |
6552 | @end deftp | |
401c53c4 | 6553 | |
cf4a9129 LC |
6554 | For convenience, a variable lists all the basic user groups one may |
6555 | expect: | |
401c53c4 | 6556 | |
cf4a9129 LC |
6557 | @defvr {Scheme Variable} %base-groups |
6558 | This is the list of basic user groups that users and/or packages expect | |
6559 | to be present on the system. This includes groups such as ``root'', | |
6560 | ``wheel'', and ``users'', as well as groups used to control access to | |
6561 | specific devices such as ``audio'', ``disk'', and ``cdrom''. | |
6562 | @end defvr | |
401c53c4 | 6563 | |
bf87f38a LC |
6564 | @defvr {Scheme Variable} %base-user-accounts |
6565 | This is the list of basic system accounts that programs may expect to | |
6566 | find on a GNU/Linux system, such as the ``nobody'' account. | |
6567 | ||
6568 | Note that the ``root'' account is not included here. It is a | |
6569 | special-case and is automatically added whether or not it is specified. | |
6570 | @end defvr | |
6571 | ||
598e19dc LC |
6572 | @node Locales |
6573 | @subsection Locales | |
6574 | ||
6575 | @cindex locale | |
6576 | A @dfn{locale} defines cultural conventions for a particular language | |
6577 | and region of the world (@pxref{Locales,,, libc, The GNU C Library | |
6578 | Reference Manual}). Each locale has a name that typically has the form | |
b2636518 | 6579 | @code{@var{language}_@var{territory}.@var{codeset}}---e.g., |
598e19dc LC |
6580 | @code{fr_LU.utf8} designates the locale for the French language, with |
6581 | cultural conventions from Luxembourg, and using the UTF-8 encoding. | |
6582 | ||
6583 | @cindex locale definition | |
6584 | Usually, you will want to specify the default locale for the machine | |
6585 | using the @code{locale} field of the @code{operating-system} declaration | |
6586 | (@pxref{operating-system Reference, @code{locale}}). | |
6587 | ||
f5582b2c LC |
6588 | The selected locale is automatically added to the @dfn{locale |
6589 | definitions} known to the system if needed, with its codeset inferred | |
6590 | from its name---e.g., @code{bo_CN.utf8} will be assumed to use the | |
6591 | @code{UTF-8} codeset. Additional locale definitions can be specified in | |
6592 | the @code{locale-definitions} slot of @code{operating-system}---this is | |
6593 | useful, for instance, if the codeset could not be inferred from the | |
6594 | locale name. The default set of locale definitions includes some widely | |
6595 | used locales, but not all the available locales, in order to save space. | |
6596 | ||
6597 | For instance, to add the North Frisian locale for Germany, the value of | |
6598 | that field may be: | |
598e19dc LC |
6599 | |
6600 | @example | |
6601 | (cons (locale-definition | |
6602 | (name "fy_DE.utf8") (source "fy_DE")) | |
6603 | %default-locale-definitions) | |
6604 | @end example | |
6605 | ||
6606 | Likewise, to save space, one might want @code{locale-definitions} to | |
6607 | list only the locales that are actually used, as in: | |
6608 | ||
6609 | @example | |
6610 | (list (locale-definition | |
6611 | (name "ja_JP.eucjp") (source "ja_JP") | |
6612 | (charset "EUC-JP"))) | |
6613 | @end example | |
6614 | ||
5c3c1427 LC |
6615 | @vindex LOCPATH |
6616 | The compiled locale definitions are available at | |
46bd6edd LC |
6617 | @file{/run/current-system/locale/X.Y}, where @code{X.Y} is the libc |
6618 | version, which is the default location where the GNU@tie{}libc provided | |
6619 | by Guix looks for locale data. This can be overridden using the | |
6620 | @code{LOCPATH} environment variable (@pxref{locales-and-locpath, | |
5c3c1427 LC |
6621 | @code{LOCPATH} and locale packages}). |
6622 | ||
598e19dc LC |
6623 | The @code{locale-definition} form is provided by the @code{(gnu system |
6624 | locale)} module. Details are given below. | |
6625 | ||
6626 | @deftp {Data Type} locale-definition | |
6627 | This is the data type of a locale definition. | |
6628 | ||
6629 | @table @asis | |
6630 | ||
6631 | @item @code{name} | |
6632 | The name of the locale. @xref{Locale Names,,, libc, The GNU C Library | |
6633 | Reference Manual}, for more information on locale names. | |
6634 | ||
6635 | @item @code{source} | |
6636 | The name of the source for that locale. This is typically the | |
6637 | @code{@var{language}_@var{territory}} part of the locale name. | |
6638 | ||
6639 | @item @code{charset} (default: @code{"UTF-8"}) | |
6640 | The ``character set'' or ``code set'' for that locale, | |
6641 | @uref{http://www.iana.org/assignments/character-sets, as defined by | |
6642 | IANA}. | |
6643 | ||
6644 | @end table | |
6645 | @end deftp | |
6646 | ||
6647 | @defvr {Scheme Variable} %default-locale-definitions | |
b2636518 LC |
6648 | An arbitrary list of commonly used UTF-8 locales, used as the default |
6649 | value of the @code{locale-definitions} field of @code{operating-system} | |
598e19dc | 6650 | declarations. |
b2636518 LC |
6651 | |
6652 | @cindex locale name | |
6653 | @cindex normalized codeset in locale names | |
6654 | These locale definitions use the @dfn{normalized codeset} for the part | |
6655 | that follows the dot in the name (@pxref{Using gettextized software, | |
6656 | normalized codeset,, libc, The GNU C Library Reference Manual}). So for | |
6657 | instance it has @code{uk_UA.utf8} but @emph{not}, say, | |
6658 | @code{uk_UA.UTF-8}. | |
598e19dc | 6659 | @end defvr |
401c53c4 | 6660 | |
34760ae7 LC |
6661 | @subsubsection Locale Data Compatibility Considerations |
6662 | ||
6663 | @cindex incompatibility, of locale data | |
6664 | @code{operating-system} declarations provide a @code{locale-libcs} field | |
6665 | to specify the GNU@tie{}libc packages that are used to compile locale | |
6666 | declarations (@pxref{operating-system Reference}). ``Why would I | |
6667 | care?'', you may ask. Well, it turns out that the binary format of | |
6668 | locale data is occasionally incompatible from one libc version to | |
6669 | another. | |
6670 | ||
6671 | @c See <https://sourceware.org/ml/libc-alpha/2015-09/msg00575.html> | |
6672 | @c and <https://lists.gnu.org/archive/html/guix-devel/2015-08/msg00737.html>. | |
6673 | For instance, a program linked against libc version 2.21 is unable to | |
6674 | read locale data produced with libc 2.22; worse, that program | |
6675 | @emph{aborts} instead of simply ignoring the incompatible locale | |
6676 | data@footnote{Versions 2.23 and later of GNU@tie{}libc will simply skip | |
6677 | the incompatible locale data, which is already an improvement.}. | |
6678 | Similarly, a program linked against libc 2.22 can read most, but not | |
6679 | all, the locale data from libc 2.21 (specifically, @code{LC_COLLATE} | |
6680 | data is incompatible); thus calls to @code{setlocale} may fail, but | |
6681 | programs will not abort. | |
6682 | ||
6683 | The ``problem'' in GuixSD is that users have a lot of freedom: They can | |
6684 | choose whether and when to upgrade software in their profiles, and might | |
6685 | be using a libc version different from the one the system administrator | |
6686 | used to build the system-wide locale data. | |
6687 | ||
6688 | Fortunately, unprivileged users can also install their own locale data | |
6689 | and define @var{GUIX_LOCPATH} accordingly (@pxref{locales-and-locpath, | |
6690 | @code{GUIX_LOCPATH} and locale packages}). | |
6691 | ||
6692 | Still, it is best if the system-wide locale data at | |
6693 | @file{/run/current-system/locale} is built for all the libc versions | |
6694 | actually in use on the system, so that all the programs can access | |
6695 | it---this is especially crucial on a multi-user system. To do that, the | |
6696 | administrator can specify several libc packages in the | |
6697 | @code{locale-libcs} field of @code{operating-system}: | |
6698 | ||
6699 | @example | |
6700 | (use-package-modules base) | |
6701 | ||
6702 | (operating-system | |
6703 | ;; @dots{} | |
6704 | (locale-libcs (list glibc-2.21 (canonical-package glibc)))) | |
6705 | @end example | |
6706 | ||
6707 | This example would lead to a system containing locale definitions for | |
6708 | both libc 2.21 and the current version of libc in | |
6709 | @file{/run/current-system/locale}. | |
6710 | ||
6711 | ||
cf4a9129 LC |
6712 | @node Services |
6713 | @subsection Services | |
401c53c4 | 6714 | |
cf4a9129 LC |
6715 | @cindex system services |
6716 | An important part of preparing an @code{operating-system} declaration is | |
6717 | listing @dfn{system services} and their configuration (@pxref{Using the | |
6718 | Configuration System}). System services are typically daemons launched | |
6719 | when the system boots, or other actions needed at that time---e.g., | |
d8b94dbd LC |
6720 | configuring network access. |
6721 | ||
dd17bc38 AK |
6722 | Services are managed by the GNU@tie{}Shepherd (@pxref{Introduction,,, |
6723 | shepherd, The GNU Shepherd Manual}). On a running system, the | |
6724 | @command{herd} command allows you to list the available services, show | |
6725 | their status, start and stop them, or do other specific operations | |
6726 | (@pxref{Jump Start,,, shepherd, The GNU Shepherd Manual}). For example: | |
d8b94dbd LC |
6727 | |
6728 | @example | |
dd17bc38 | 6729 | # herd status |
d8b94dbd LC |
6730 | @end example |
6731 | ||
6732 | The above command, run as @code{root}, lists the currently defined | |
dd17bc38 | 6733 | services. The @command{herd doc} command shows a synopsis of the given |
d8b94dbd LC |
6734 | service: |
6735 | ||
6736 | @example | |
dd17bc38 | 6737 | # herd doc nscd |
d8b94dbd LC |
6738 | Run libc's name service cache daemon (nscd). |
6739 | @end example | |
6740 | ||
6741 | The @command{start}, @command{stop}, and @command{restart} sub-commands | |
6742 | have the effect you would expect. For instance, the commands below stop | |
6743 | the nscd service and restart the Xorg display server: | |
6744 | ||
6745 | @example | |
dd17bc38 | 6746 | # herd stop nscd |
d8b94dbd | 6747 | Service nscd has been stopped. |
dd17bc38 | 6748 | # herd restart xorg-server |
d8b94dbd LC |
6749 | Service xorg-server has been stopped. |
6750 | Service xorg-server has been started. | |
6751 | @end example | |
401c53c4 | 6752 | |
cf4a9129 | 6753 | The following sections document the available services, starting with |
d8b94dbd LC |
6754 | the core services, that may be used in an @code{operating-system} |
6755 | declaration. | |
401c53c4 | 6756 | |
cf4a9129 LC |
6757 | @menu |
6758 | * Base Services:: Essential system services. | |
6759 | * Networking Services:: Network setup, SSH daemon, etc. | |
6760 | * X Window:: Graphical display. | |
fe1a39d3 | 6761 | * Desktop Services:: D-Bus and desktop services. |
105369a4 | 6762 | * Database Services:: SQL databases. |
d8c18af8 | 6763 | * Mail Services:: IMAP, POP3, SMTP, and all that. |
58724c48 | 6764 | * Web Services:: Web servers. |
aa4ed923 | 6765 | * Various Services:: Other services. |
cf4a9129 | 6766 | @end menu |
401c53c4 | 6767 | |
cf4a9129 LC |
6768 | @node Base Services |
6769 | @subsubsection Base Services | |
a1ba8475 | 6770 | |
cf4a9129 LC |
6771 | The @code{(gnu services base)} module provides definitions for the basic |
6772 | services that one expects from the system. The services exported by | |
6773 | this module are listed below. | |
401c53c4 | 6774 | |
cf4a9129 | 6775 | @defvr {Scheme Variable} %base-services |
31771497 LC |
6776 | This variable contains a list of basic services (@pxref{Service Types |
6777 | and Services}, for more information on service objects) one would | |
cf4a9129 LC |
6778 | expect from the system: a login service (mingetty) on each tty, syslogd, |
6779 | libc's name service cache daemon (nscd), the udev device manager, and | |
6780 | more. | |
401c53c4 | 6781 | |
cf4a9129 LC |
6782 | This is the default value of the @code{services} field of |
6783 | @code{operating-system} declarations. Usually, when customizing a | |
6784 | system, you will want to append services to @var{%base-services}, like | |
6785 | this: | |
401c53c4 | 6786 | |
cf4a9129 | 6787 | @example |
fa1e31b8 | 6788 | (cons* (avahi-service) (lsh-service) %base-services) |
cf4a9129 LC |
6789 | @end example |
6790 | @end defvr | |
401c53c4 | 6791 | |
be1c2c54 | 6792 | @deffn {Scheme Procedure} host-name-service @var{name} |
cf4a9129 LC |
6793 | Return a service that sets the host name to @var{name}. |
6794 | @end deffn | |
401c53c4 | 6795 | |
66e4f01c LC |
6796 | @deffn {Scheme Procedure} mingetty-service @var{config} |
6797 | Return a service to run mingetty according to @var{config}, a | |
6798 | @code{<mingetty-configuration>} object, which specifies the tty to run, among | |
6799 | other things. | |
cf4a9129 | 6800 | @end deffn |
401c53c4 | 6801 | |
66e4f01c LC |
6802 | @deftp {Data Type} mingetty-configuration |
6803 | This is the data type representing the configuration of Mingetty, which | |
6804 | implements console log-in. | |
6805 | ||
6806 | @table @asis | |
6807 | ||
6808 | @item @code{tty} | |
6809 | The name of the console this Mingetty runs on---e.g., @code{"tty1"}. | |
6810 | ||
6811 | @item @code{motd} | |
6812 | A file-like object containing the ``message of the day''. | |
6813 | ||
6814 | @item @code{auto-login} (default: @code{#f}) | |
6815 | When true, this field must be a string denoting the user name under | |
f9b9a033 | 6816 | which the system automatically logs in. When it is @code{#f}, a |
66e4f01c LC |
6817 | user name and password must be entered to log in. |
6818 | ||
6819 | @item @code{login-program} (default: @code{#f}) | |
6820 | This must be either @code{#f}, in which case the default log-in program | |
6821 | is used (@command{login} from the Shadow tool suite), or a gexp denoting | |
6822 | the name of the log-in program. | |
6823 | ||
6824 | @item @code{login-pause?} (default: @code{#f}) | |
6825 | When set to @code{#t} in conjunction with @var{auto-login}, the user | |
6826 | will have to press a key before the log-in shell is launched. | |
6827 | ||
6828 | @item @code{mingetty} (default: @var{mingetty}) | |
6829 | The Mingetty package to use. | |
6830 | ||
6831 | @end table | |
6832 | @end deftp | |
6833 | ||
6454b333 LC |
6834 | @cindex name service cache daemon |
6835 | @cindex nscd | |
be1c2c54 | 6836 | @deffn {Scheme Procedure} nscd-service [@var{config}] [#:glibc glibc] @ |
4aee6e60 | 6837 | [#:name-services '()] |
b893f1ae LC |
6838 | Return a service that runs libc's name service cache daemon (nscd) with the |
6839 | given @var{config}---an @code{<nscd-configuration>} object. @xref{Name | |
6840 | Service Switch}, for an example. | |
cf4a9129 | 6841 | @end deffn |
401c53c4 | 6842 | |
6454b333 LC |
6843 | @defvr {Scheme Variable} %nscd-default-configuration |
6844 | This is the default @code{<nscd-configuration>} value (see below) used | |
6845 | by @code{nscd-service}. This uses the caches defined by | |
6846 | @var{%nscd-default-caches}; see below. | |
6847 | @end defvr | |
6848 | ||
6849 | @deftp {Data Type} nscd-configuration | |
6850 | This is the type representing the name service cache daemon (nscd) | |
6851 | configuration. | |
6852 | ||
6853 | @table @asis | |
6854 | ||
b893f1ae LC |
6855 | @item @code{name-services} (default: @code{'()}) |
6856 | List of packages denoting @dfn{name services} that must be visible to | |
6857 | the nscd---e.g., @code{(list @var{nss-mdns})}. | |
6858 | ||
6859 | @item @code{glibc} (default: @var{glibc}) | |
6860 | Package object denoting the GNU C Library providing the @command{nscd} | |
6861 | command. | |
6862 | ||
6454b333 LC |
6863 | @item @code{log-file} (default: @code{"/var/log/nscd.log"}) |
6864 | Name of nscd's log file. This is where debugging output goes when | |
6865 | @code{debug-level} is strictly positive. | |
6866 | ||
6867 | @item @code{debug-level} (default: @code{0}) | |
6868 | Integer denoting the debugging levels. Higher numbers mean more | |
6869 | debugging output is logged. | |
6870 | ||
6871 | @item @code{caches} (default: @var{%nscd-default-caches}) | |
6872 | List of @code{<nscd-cache>} objects denoting things to be cached; see | |
6873 | below. | |
6874 | ||
6875 | @end table | |
6876 | @end deftp | |
6877 | ||
6878 | @deftp {Data Type} nscd-cache | |
6879 | Data type representing a cache database of nscd and its parameters. | |
6880 | ||
6881 | @table @asis | |
6882 | ||
6883 | @item @code{database} | |
6884 | This is a symbol representing the name of the database to be cached. | |
6885 | Valid values are @code{passwd}, @code{group}, @code{hosts}, and | |
6886 | @code{services}, which designate the corresponding NSS database | |
6887 | (@pxref{NSS Basics,,, libc, The GNU C Library Reference Manual}). | |
6888 | ||
6889 | @item @code{positive-time-to-live} | |
6890 | @itemx @code{negative-time-to-live} (default: @code{20}) | |
6891 | A number representing the number of seconds during which a positive or | |
6892 | negative lookup result remains in cache. | |
6893 | ||
6894 | @item @code{check-files?} (default: @code{#t}) | |
6895 | Whether to check for updates of the files corresponding to | |
6896 | @var{database}. | |
6897 | ||
6898 | For instance, when @var{database} is @code{hosts}, setting this flag | |
6899 | instructs nscd to check for updates in @file{/etc/hosts} and to take | |
6900 | them into account. | |
6901 | ||
6902 | @item @code{persistent?} (default: @code{#t}) | |
6903 | Whether the cache should be stored persistently on disk. | |
6904 | ||
6905 | @item @code{shared?} (default: @code{#t}) | |
6906 | Whether the cache should be shared among users. | |
6907 | ||
6908 | @item @code{max-database-size} (default: 32@tie{}MiB) | |
6909 | Maximum size in bytes of the database cache. | |
6910 | ||
6911 | @c XXX: 'suggested-size' and 'auto-propagate?' seem to be expert | |
6912 | @c settings, so leave them out. | |
6913 | ||
6914 | @end table | |
6915 | @end deftp | |
6916 | ||
6917 | @defvr {Scheme Variable} %nscd-default-caches | |
6918 | List of @code{<nscd-cache>} objects used by default by | |
6919 | @code{nscd-configuration} (see above.) | |
6920 | ||
6921 | It enables persistent and aggressive caching of service and host name | |
6922 | lookups. The latter provides better host name lookup performance, | |
6923 | resilience in the face of unreliable name servers, and also better | |
6924 | privacy---often the result of host name lookups is in local cache, so | |
6925 | external name servers do not even need to be queried. | |
6926 | @end defvr | |
6927 | ||
6928 | ||
be1c2c54 | 6929 | @deffn {Scheme Procedure} syslog-service [#:config-file #f] |
1bb76f75 AK |
6930 | Return a service that runs @code{syslogd}. If configuration file name |
6931 | @var{config-file} is not specified, use some reasonable default | |
cf4a9129 LC |
6932 | settings. |
6933 | @end deffn | |
401c53c4 | 6934 | |
0adfe95a LC |
6935 | @anchor{guix-configuration-type} |
6936 | @deftp {Data Type} guix-configuration | |
6937 | This data type represents the configuration of the Guix build daemon. | |
6938 | @xref{Invoking guix-daemon}, for more information. | |
6939 | ||
6940 | @table @asis | |
6941 | @item @code{guix} (default: @var{guix}) | |
6942 | The Guix package to use. | |
401c53c4 | 6943 | |
0adfe95a LC |
6944 | @item @code{build-group} (default: @code{"guixbuild"}) |
6945 | Name of the group for build user accounts. | |
401c53c4 | 6946 | |
0adfe95a LC |
6947 | @item @code{build-accounts} (default: @code{10}) |
6948 | Number of build user accounts to create. | |
401c53c4 | 6949 | |
0adfe95a LC |
6950 | @item @code{authorize-key?} (default: @code{#t}) |
6951 | Whether to authorize the substitute key for @code{hydra.gnu.org} | |
6952 | (@pxref{Substitutes}). | |
6953 | ||
6954 | @item @code{use-substitutes?} (default: @code{#t}) | |
6955 | Whether to use substitutes. | |
6956 | ||
b0b9f6e0 LC |
6957 | @item @code{substitute-urls} (default: @var{%default-substitute-urls}) |
6958 | The list of URLs where to look for substitutes by default. | |
6959 | ||
0adfe95a LC |
6960 | @item @code{extra-options} (default: @code{'()}) |
6961 | List of extra command-line options for @command{guix-daemon}. | |
6962 | ||
6963 | @item @code{lsof} (default: @var{lsof}) | |
6964 | @itemx @code{lsh} (default: @var{lsh}) | |
6965 | The lsof and lsh packages to use. | |
6966 | ||
6967 | @end table | |
6968 | @end deftp | |
6969 | ||
6970 | @deffn {Scheme Procedure} guix-service @var{config} | |
6971 | Return a service that runs the Guix build daemon according to | |
6972 | @var{config}. | |
cf4a9129 | 6973 | @end deffn |
a1ba8475 | 6974 | |
be1c2c54 | 6975 | @deffn {Scheme Procedure} udev-service [#:udev udev] |
cf4a9129 LC |
6976 | Run @var{udev}, which populates the @file{/dev} directory dynamically. |
6977 | @end deffn | |
401c53c4 | 6978 | |
be1c2c54 | 6979 | @deffn {Scheme Procedure} console-keymap-service @var{file} |
dedb8d5e | 6980 | @cindex keyboard layout |
5eca9459 AK |
6981 | Return a service to load console keymap from @var{file} using |
6982 | @command{loadkeys} command. | |
6983 | @end deffn | |
6984 | ||
8664cc88 LC |
6985 | @deffn {Scheme Procedure} gpm-service-type [#:gpm @var{gpm}] @ |
6986 | [#:options] | |
6987 | Run @var{gpm}, the general-purpose mouse daemon, with the given | |
6988 | command-line @var{options}. GPM allows users to use the mouse in the console, | |
6989 | notably to select, copy, and paste text. The default value of @var{options} | |
6990 | uses the @code{ps2} protocol, which works for both USB and PS/2 mice. | |
6991 | ||
6992 | This service is not part of @var{%base-services}. | |
6993 | @end deffn | |
6994 | ||
1c52181f LC |
6995 | @anchor{guix-publish-service} |
6996 | @deffn {Scheme Procedure} guix-publish-service [#:guix @var{guix}] @ | |
6997 | [#:port 80] [#:host "localhost"] | |
6998 | Return a service that runs @command{guix publish} listening on @var{host} | |
6999 | and @var{port} (@pxref{Invoking guix publish}). | |
7000 | ||
7001 | This assumes that @file{/etc/guix} already contains a signing key pair as | |
7002 | created by @command{guix archive --generate-key} (@pxref{Invoking guix | |
7003 | archive}). If that is not the case, the service will fail to start. | |
7004 | @end deffn | |
7005 | ||
a69576ea | 7006 | |
cf4a9129 LC |
7007 | @node Networking Services |
7008 | @subsubsection Networking Services | |
401c53c4 | 7009 | |
fa1e31b8 | 7010 | The @code{(gnu services networking)} module provides services to configure |
cf4a9129 | 7011 | the network interface. |
a1ba8475 | 7012 | |
a023cca8 | 7013 | @cindex DHCP, networking service |
be1c2c54 | 7014 | @deffn {Scheme Procedure} dhcp-client-service [#:dhcp @var{isc-dhcp}] |
a023cca8 LC |
7015 | Return a service that runs @var{dhcp}, a Dynamic Host Configuration |
7016 | Protocol (DHCP) client, on all the non-loopback network interfaces. | |
7017 | @end deffn | |
7018 | ||
be1c2c54 | 7019 | @deffn {Scheme Procedure} static-networking-service @var{interface} @var{ip} @ |
cf4a9129 LC |
7020 | [#:gateway #f] [#:name-services @code{'()}] |
7021 | Return a service that starts @var{interface} with address @var{ip}. If | |
7022 | @var{gateway} is true, it must be a string specifying the default network | |
7023 | gateway. | |
7024 | @end deffn | |
8b315a6d | 7025 | |
b7d0c494 | 7026 | @cindex wicd |
87f40011 | 7027 | @cindex network management |
be1c2c54 | 7028 | @deffn {Scheme Procedure} wicd-service [#:wicd @var{wicd}] |
87f40011 LC |
7029 | Return a service that runs @url{https://launchpad.net/wicd,Wicd}, a network |
7030 | management daemon that aims to simplify wired and wireless networking. | |
7031 | ||
7032 | This service adds the @var{wicd} package to the global profile, providing | |
7033 | several commands to interact with the daemon and configure networking: | |
7034 | @command{wicd-client}, a graphical user interface, and the @command{wicd-cli} | |
7035 | and @command{wicd-curses} user interfaces. | |
b7d0c494 MW |
7036 | @end deffn |
7037 | ||
c0a9589d SB |
7038 | @cindex NetworkManager |
7039 | @deffn {Scheme Procedure} network-manager-service @ | |
7040 | [#:network-manager @var{network-manager}] | |
7041 | Return a service that runs NetworkManager, a network connection manager | |
7042 | that attempting to keep active network connectivity when available. | |
7043 | @end deffn | |
7044 | ||
be1c2c54 | 7045 | @deffn {Scheme Procedure} ntp-service [#:ntp @var{ntp}] @ |
63854bcb LC |
7046 | [#:name-service @var{%ntp-servers}] |
7047 | Return a service that runs the daemon from @var{ntp}, the | |
7048 | @uref{http://www.ntp.org, Network Time Protocol package}. The daemon will | |
7049 | keep the system clock synchronized with that of @var{servers}. | |
7050 | @end deffn | |
7051 | ||
7052 | @defvr {Scheme Variable} %ntp-servers | |
7053 | List of host names used as the default NTP servers. | |
7054 | @end defvr | |
7055 | ||
375c6108 LC |
7056 | @deffn {Scheme Procedure} tor-service [@var{config-file}] [#:tor @var{tor}] |
7057 | Return a service to run the @uref{https://torproject.org, Tor} anonymous | |
7058 | networking daemon. | |
8b315a6d | 7059 | |
375c6108 | 7060 | The daemon runs as the @code{tor} unprivileged user. It is passed |
6331bde7 LC |
7061 | @var{config-file}, a file-like object, with an additional @code{User tor} line |
7062 | and lines for hidden services added via @code{tor-hidden-service}. Run | |
7063 | @command{man tor} for information about the configuration file. | |
7064 | @end deffn | |
7065 | ||
24a8ef3b | 7066 | @cindex hidden service |
6331bde7 LC |
7067 | @deffn {Scheme Procedure} tor-hidden-service @var{name} @var{mapping} |
7068 | Define a new Tor @dfn{hidden service} called @var{name} and implementing | |
7069 | @var{mapping}. @var{mapping} is a list of port/host tuples, such as: | |
7070 | ||
7071 | @example | |
24a8ef3b LC |
7072 | '((22 "127.0.0.1:22") |
7073 | (80 "127.0.0.1:8080")) | |
6331bde7 LC |
7074 | @end example |
7075 | ||
7076 | In this example, port 22 of the hidden service is mapped to local port 22, and | |
7077 | port 80 is mapped to local port 8080. | |
7078 | ||
6629099a LC |
7079 | This creates a @file{/var/lib/tor/hidden-services/@var{name}} directory, where |
7080 | the @file{hostname} file contains the @code{.onion} host name for the hidden | |
6331bde7 LC |
7081 | service. |
7082 | ||
7083 | See @uref{https://www.torproject.org/docs/tor-hidden-service.html.en, the Tor | |
7084 | project's documentation} for more information. | |
cf4a9129 | 7085 | @end deffn |
8b315a6d | 7086 | |
be1c2c54 | 7087 | @deffn {Scheme Procedure} bitlbee-service [#:bitlbee bitlbee] @ |
4627a464 LC |
7088 | [#:interface "127.0.0.1"] [#:port 6667] @ |
7089 | [#:extra-settings ""] | |
7090 | Return a service that runs @url{http://bitlbee.org,BitlBee}, a daemon that | |
7091 | acts as a gateway between IRC and chat networks. | |
7092 | ||
7093 | The daemon will listen to the interface corresponding to the IP address | |
7094 | specified in @var{interface}, on @var{port}. @code{127.0.0.1} means that only | |
7095 | local clients can connect, whereas @code{0.0.0.0} means that connections can | |
7096 | come from any networking interface. | |
7097 | ||
7098 | In addition, @var{extra-settings} specifies a string to append to the | |
7099 | configuration file. | |
7100 | @end deffn | |
7101 | ||
f4391bec | 7102 | Furthermore, @code{(gnu services ssh)} provides the following service. |
8b315a6d | 7103 | |
be1c2c54 | 7104 | @deffn {Scheme Procedure} lsh-service [#:host-key "/etc/lsh/host-key"] @ |
5833bf33 | 7105 | [#:daemonic? #t] [#:interfaces '()] [#:port-number 22] @ |
cf4a9129 LC |
7106 | [#:allow-empty-passwords? #f] [#:root-login? #f] @ |
7107 | [#:syslog-output? #t] [#:x11-forwarding? #t] @ | |
7108 | [#:tcp/ip-forwarding? #t] [#:password-authentication? #t] @ | |
21cc905a | 7109 | [#:public-key-authentication? #t] [#:initialize? #t] |
cf4a9129 LC |
7110 | Run the @command{lshd} program from @var{lsh} to listen on port @var{port-number}. |
7111 | @var{host-key} must designate a file containing the host key, and readable | |
7112 | only by root. | |
72e25e35 | 7113 | |
5833bf33 DP |
7114 | When @var{daemonic?} is true, @command{lshd} will detach from the |
7115 | controlling terminal and log its output to syslogd, unless one sets | |
7116 | @var{syslog-output?} to false. Obviously, it also makes lsh-service | |
7117 | depend on existence of syslogd service. When @var{pid-file?} is true, | |
7118 | @command{lshd} writes its PID to the file called @var{pid-file}. | |
7119 | ||
cf4a9129 LC |
7120 | When @var{initialize?} is true, automatically create the seed and host key |
7121 | upon service activation if they do not exist yet. This may take long and | |
7122 | require interaction. | |
8b315a6d | 7123 | |
20dd519c LC |
7124 | When @var{initialize?} is false, it is up to the user to initialize the |
7125 | randomness generator (@pxref{lsh-make-seed,,, lsh, LSH Manual}), and to create | |
7126 | a key pair with the private key stored in file @var{host-key} (@pxref{lshd | |
7127 | basics,,, lsh, LSH Manual}). | |
7128 | ||
cf4a9129 LC |
7129 | When @var{interfaces} is empty, lshd listens for connections on all the |
7130 | network interfaces; otherwise, @var{interfaces} must be a list of host names | |
7131 | or addresses. | |
9bf3c1a7 | 7132 | |
20dd519c LC |
7133 | @var{allow-empty-passwords?} specifies whether to accept log-ins with empty |
7134 | passwords, and @var{root-login?} specifies whether to accept log-ins as | |
cf4a9129 | 7135 | root. |
4af2447e | 7136 | |
cf4a9129 LC |
7137 | The other options should be self-descriptive. |
7138 | @end deffn | |
4af2447e | 7139 | |
fa0c1d61 LC |
7140 | @defvr {Scheme Variable} %facebook-host-aliases |
7141 | This variable contains a string for use in @file{/etc/hosts} | |
7142 | (@pxref{Host Names,,, libc, The GNU C Library Reference Manual}). Each | |
7143 | line contains a entry that maps a known server name of the Facebook | |
7144 | on-line service---e.g., @code{www.facebook.com}---to the local | |
7145 | host---@code{127.0.0.1} or its IPv6 equivalent, @code{::1}. | |
7146 | ||
7147 | This variable is typically used in the @code{hosts-file} field of an | |
7313a52e LC |
7148 | @code{operating-system} declaration (@pxref{operating-system Reference, |
7149 | @file{/etc/hosts}}): | |
fa0c1d61 LC |
7150 | |
7151 | @example | |
7152 | (use-modules (gnu) (guix)) | |
7153 | ||
7154 | (operating-system | |
7155 | (host-name "mymachine") | |
7156 | ;; ... | |
7157 | (hosts-file | |
7158 | ;; Create a /etc/hosts file with aliases for "localhost" | |
7159 | ;; and "mymachine", as well as for Facebook servers. | |
24e02c28 LC |
7160 | (plain-file "hosts" |
7161 | (string-append (local-host-aliases host-name) | |
7162 | %facebook-host-aliases)))) | |
fa0c1d61 LC |
7163 | @end example |
7164 | ||
7165 | This mechanism can prevent programs running locally, such as Web | |
7166 | browsers, from accessing Facebook. | |
7167 | @end defvr | |
7168 | ||
965a7332 LC |
7169 | The @code{(gnu services avahi)} provides the following definition. |
7170 | ||
be1c2c54 | 7171 | @deffn {Scheme Procedure} avahi-service [#:avahi @var{avahi}] @ |
965a7332 LC |
7172 | [#:host-name #f] [#:publish? #t] [#:ipv4? #t] @ |
7173 | [#:ipv6? #t] [#:wide-area? #f] @ | |
7174 | [#:domains-to-browse '()] | |
7175 | Return a service that runs @command{avahi-daemon}, a system-wide | |
7176 | mDNS/DNS-SD responder that allows for service discovery and | |
cc9c1f39 LC |
7177 | "zero-configuration" host name lookups (see @uref{http://avahi.org/}), and |
7178 | extends the name service cache daemon (nscd) so that it can resolve | |
7179 | @code{.local} host names using | |
1065bed9 LC |
7180 | @uref{http://0pointer.de/lennart/projects/nss-mdns/, nss-mdns}. Additionally, |
7181 | add the @var{avahi} package to the system profile so that commands such as | |
7182 | @command{avahi-browse} are directly usable. | |
965a7332 LC |
7183 | |
7184 | If @var{host-name} is different from @code{#f}, use that as the host name to | |
7185 | publish for this machine; otherwise, use the machine's actual host name. | |
7186 | ||
7187 | When @var{publish?} is true, publishing of host names and services is allowed; | |
7188 | in particular, avahi-daemon will publish the machine's host name and IP | |
7189 | address via mDNS on the local network. | |
7190 | ||
7191 | When @var{wide-area?} is true, DNS-SD over unicast DNS is enabled. | |
7192 | ||
7193 | Boolean values @var{ipv4?} and @var{ipv6?} determine whether to use IPv4/IPv6 | |
7194 | sockets. | |
7195 | @end deffn | |
7196 | ||
7197 | ||
cf4a9129 LC |
7198 | @node X Window |
7199 | @subsubsection X Window | |
68ad877c | 7200 | |
cf4a9129 LC |
7201 | Support for the X Window graphical display system---specifically |
7202 | Xorg---is provided by the @code{(gnu services xorg)} module. Note that | |
7203 | there is no @code{xorg-service} procedure. Instead, the X server is | |
7204 | started by the @dfn{login manager}, currently SLiM. | |
4af2447e | 7205 | |
be1c2c54 | 7206 | @deffn {Scheme Procedure} slim-service [#:allow-empty-passwords? #f] @ |
0ecc3bf3 LC |
7207 | [#:auto-login? #f] [#:default-user ""] [#:startx] @ |
7208 | [#:theme @var{%default-slim-theme}] @ | |
4bd43bbe | 7209 | [#:theme-name @var{%default-slim-theme-name}] |
cf4a9129 LC |
7210 | Return a service that spawns the SLiM graphical login manager, which in |
7211 | turn starts the X display server with @var{startx}, a command as returned by | |
7212 | @code{xorg-start-command}. | |
4af2447e | 7213 | |
04e4e6ab LC |
7214 | @cindex X session |
7215 | ||
7216 | SLiM automatically looks for session types described by the @file{.desktop} | |
7217 | files in @file{/run/current-system/profile/share/xsessions} and allows users | |
7218 | to choose a session from the log-in screen using @kbd{F1}. Packages such as | |
7219 | @var{xfce}, @var{sawfish}, and @var{ratpoison} provide @file{.desktop} files; | |
7220 | adding them to the system-wide set of packages automatically makes them | |
7221 | available at the log-in screen. | |
7222 | ||
7223 | In addition, @file{~/.xsession} files are honored. When available, | |
7224 | @file{~/.xsession} must be an executable that starts a window manager | |
7225 | and/or other X clients. | |
7226 | ||
cf4a9129 LC |
7227 | When @var{allow-empty-passwords?} is true, allow logins with an empty |
7228 | password. When @var{auto-login?} is true, log in automatically as | |
7229 | @var{default-user}. | |
0ecc3bf3 LC |
7230 | |
7231 | If @var{theme} is @code{#f}, the use the default log-in theme; otherwise | |
7232 | @var{theme} must be a gexp denoting the name of a directory containing the | |
7233 | theme to use. In that case, @var{theme-name} specifies the name of the | |
7234 | theme. | |
cf4a9129 | 7235 | @end deffn |
4af2447e | 7236 | |
0ecc3bf3 LC |
7237 | @defvr {Scheme Variable} %default-theme |
7238 | @defvrx {Scheme Variable} %default-theme-name | |
7239 | The G-Expression denoting the default SLiM theme and its name. | |
7240 | @end defvr | |
7241 | ||
be1c2c54 | 7242 | @deffn {Scheme Procedure} xorg-start-command [#:guile] @ |
d1cdd7ba | 7243 | [#:configuration-file #f] [#:xorg-server @var{xorg-server}] |
f703413e | 7244 | Return a derivation that builds a @var{guile} script to start the X server |
d1cdd7ba LC |
7245 | from @var{xorg-server}. @var{configuration-file} is the server configuration |
7246 | file or a derivation that builds it; when omitted, the result of | |
7247 | @code{xorg-configuration-file} is used. | |
7248 | ||
7249 | Usually the X server is started by a login manager. | |
7250 | @end deffn | |
7251 | ||
be1c2c54 | 7252 | @deffn {Scheme Procedure} xorg-configuration-file @ |
12422c9d | 7253 | [#:drivers '()] [#:resolutions '()] [#:extra-config '()] |
d1cdd7ba LC |
7254 | Return a configuration file for the Xorg server containing search paths for |
7255 | all the common drivers. | |
f703413e LC |
7256 | |
7257 | @var{drivers} must be either the empty list, in which case Xorg chooses a | |
7258 | graphics driver automatically, or a list of driver names that will be tried in | |
d1cdd7ba | 7259 | this order---e.g., @code{(\"modesetting\" \"vesa\")}. |
d2e59637 LC |
7260 | |
7261 | Likewise, when @var{resolutions} is the empty list, Xorg chooses an | |
7262 | appropriate screen resolution; otherwise, it must be a list of | |
7263 | resolutions---e.g., @code{((1024 768) (640 480))}. | |
12422c9d LC |
7264 | |
7265 | Last, @var{extra-config} is a list of strings or objects appended to the | |
7266 | @code{text-file*} argument list. It is used to pass extra text to be added | |
7267 | verbatim to the configuration file. | |
f703413e | 7268 | @end deffn |
4af2447e | 7269 | |
6726282b LC |
7270 | @deffn {Scheme Procedure} screen-locker-service @var{package} [@var{name}] |
7271 | Add @var{package}, a package for a screen-locker or screen-saver whose | |
7272 | command is @var{program}, to the set of setuid programs and add a PAM entry | |
7273 | for it. For example: | |
7274 | ||
7275 | @lisp | |
7276 | (screen-locker-service xlockmore "xlock") | |
7277 | @end lisp | |
7278 | ||
7279 | makes the good ol' XlockMore usable. | |
7280 | @end deffn | |
7281 | ||
7282 | ||
fe1a39d3 LC |
7283 | @node Desktop Services |
7284 | @subsubsection Desktop Services | |
aa4ed923 | 7285 | |
fe1a39d3 LC |
7286 | The @code{(gnu services desktop)} module provides services that are |
7287 | usually useful in the context of a ``desktop'' setup---that is, on a | |
7288 | machine running a graphical display server, possibly with graphical user | |
7289 | interfaces, etc. | |
aa4ed923 | 7290 | |
4467be21 LC |
7291 | To simplify things, the module defines a variable containing the set of |
7292 | services that users typically expect on a machine with a graphical | |
7293 | environment and networking: | |
7294 | ||
7295 | @defvr {Scheme Variable} %desktop-services | |
7296 | This is a list of services that builds upon @var{%base-services} and | |
7297 | adds or adjust services for a typical ``desktop'' setup. | |
7298 | ||
7299 | In particular, it adds a graphical login manager (@pxref{X Window, | |
6726282b LC |
7300 | @code{slim-service}}), screen lockers, |
7301 | a network management tool (@pxref{Networking | |
4467be21 | 7302 | Services, @code{wicd-service}}), energy and color management services, |
4650a77e | 7303 | the @code{elogind} login and seat manager, the Polkit privilege service, |
cee32ee4 AW |
7304 | the GeoClue location service, an NTP client (@pxref{Networking |
7305 | Services}), the Avahi daemon, and has the name service switch service | |
7306 | configured to be able to use @code{nss-mdns} (@pxref{Name Service | |
7307 | Switch, mDNS}). | |
4467be21 LC |
7308 | @end defvr |
7309 | ||
7310 | The @var{%desktop-services} variable can be used as the @code{services} | |
7311 | field of an @code{operating-system} declaration (@pxref{operating-system | |
7312 | Reference, @code{services}}). | |
7313 | ||
0adfe95a LC |
7314 | The actual service definitions provided by @code{(gnu services dbus)} |
7315 | and @code{(gnu services desktop)} are described below. | |
4467be21 | 7316 | |
0adfe95a | 7317 | @deffn {Scheme Procedure} dbus-service [#:dbus @var{dbus}] [#:services '()] |
fe1a39d3 LC |
7318 | Return a service that runs the ``system bus'', using @var{dbus}, with |
7319 | support for @var{services}. | |
aa4ed923 | 7320 | |
fe1a39d3 LC |
7321 | @uref{http://dbus.freedesktop.org/, D-Bus} is an inter-process communication |
7322 | facility. Its system bus is used to allow system services to communicate | |
7323 | and be notified of system-wide events. | |
aa4ed923 | 7324 | |
fe1a39d3 LC |
7325 | @var{services} must be a list of packages that provide an |
7326 | @file{etc/dbus-1/system.d} directory containing additional D-Bus configuration | |
7327 | and policy files. For example, to allow avahi-daemon to use the system bus, | |
7328 | @var{services} must be equal to @code{(list avahi)}. | |
aa4ed923 AK |
7329 | @end deffn |
7330 | ||
0adfe95a | 7331 | @deffn {Scheme Procedure} elogind-service [#:config @var{config}] |
4650a77e AW |
7332 | Return a service that runs the @code{elogind} login and |
7333 | seat management daemon. @uref{https://github.com/andywingo/elogind, | |
7334 | Elogind} exposes a D-Bus interface that can be used to know which users | |
7335 | are logged in, know what kind of sessions they have open, suspend the | |
7336 | system, inhibit system suspend, reboot the system, and other tasks. | |
7337 | ||
7338 | Elogind handles most system-level power events for a computer, for | |
7339 | example suspending the system when a lid is closed, or shutting it down | |
7340 | when the power button is pressed. | |
7341 | ||
7342 | The @var{config} keyword argument specifies the configuration for | |
7343 | elogind, and should be the result of a @code{(elogind-configuration | |
7344 | (@var{parameter} @var{value})...)} invocation. Available parameters and | |
7345 | their default values are: | |
7346 | ||
7347 | @table @code | |
7348 | @item kill-user-processes? | |
7349 | @code{#f} | |
7350 | @item kill-only-users | |
7351 | @code{()} | |
7352 | @item kill-exclude-users | |
7353 | @code{("root")} | |
7354 | @item inhibit-delay-max-seconds | |
7355 | @code{5} | |
7356 | @item handle-power-key | |
7357 | @code{poweroff} | |
7358 | @item handle-suspend-key | |
7359 | @code{suspend} | |
7360 | @item handle-hibernate-key | |
7361 | @code{hibernate} | |
7362 | @item handle-lid-switch | |
7363 | @code{suspend} | |
7364 | @item handle-lid-switch-docked | |
7365 | @code{ignore} | |
7366 | @item power-key-ignore-inhibited? | |
7367 | @code{#f} | |
7368 | @item suspend-key-ignore-inhibited? | |
7369 | @code{#f} | |
7370 | @item hibernate-key-ignore-inhibited? | |
7371 | @code{#f} | |
7372 | @item lid-switch-ignore-inhibited? | |
7373 | @code{#t} | |
7374 | @item holdoff-timeout-seconds | |
7375 | @code{30} | |
7376 | @item idle-action | |
7377 | @code{ignore} | |
7378 | @item idle-action-seconds | |
7379 | @code{(* 30 60)} | |
7380 | @item runtime-directory-size-percent | |
7381 | @code{10} | |
7382 | @item runtime-directory-size | |
7383 | @code{#f} | |
7384 | @item remove-ipc? | |
7385 | @code{#t} | |
7386 | @item suspend-state | |
7387 | @code{("mem" "standby" "freeze")} | |
7388 | @item suspend-mode | |
7389 | @code{()} | |
7390 | @item hibernate-state | |
7391 | @code{("disk")} | |
7392 | @item hibernate-mode | |
7393 | @code{("platform" "shutdown")} | |
7394 | @item hybrid-sleep-state | |
7395 | @code{("disk")} | |
7396 | @item hybrid-sleep-mode | |
7397 | @code{("suspend" "platform" "shutdown")} | |
7398 | @end table | |
7399 | @end deffn | |
7400 | ||
be1c2c54 | 7401 | @deffn {Scheme Procedure} polkit-service @ |
4650a77e | 7402 | [#:polkit @var{polkit}] |
222e3319 LC |
7403 | Return a service that runs the |
7404 | @uref{http://www.freedesktop.org/wiki/Software/polkit/, Polkit privilege | |
7405 | management service}, which allows system administrators to grant access to | |
7406 | privileged operations in a structured way. By querying the Polkit service, a | |
7407 | privileged system component can know when it should grant additional | |
7408 | capabilities to ordinary users. For example, an ordinary user can be granted | |
7409 | the capability to suspend the system if the user is logged in locally. | |
4650a77e AW |
7410 | @end deffn |
7411 | ||
be1c2c54 | 7412 | @deffn {Scheme Procedure} upower-service [#:upower @var{upower}] @ |
be234128 AW |
7413 | [#:watts-up-pro? #f] @ |
7414 | [#:poll-batteries? #t] @ | |
7415 | [#:ignore-lid? #f] @ | |
7416 | [#:use-percentage-for-policy? #f] @ | |
7417 | [#:percentage-low 10] @ | |
7418 | [#:percentage-critical 3] @ | |
7419 | [#:percentage-action 2] @ | |
7420 | [#:time-low 1200] @ | |
7421 | [#:time-critical 300] @ | |
7422 | [#:time-action 120] @ | |
7423 | [#:critical-power-action 'hybrid-sleep] | |
7424 | Return a service that runs @uref{http://upower.freedesktop.org/, | |
7425 | @command{upowerd}}, a system-wide monitor for power consumption and battery | |
7426 | levels, with the given configuration settings. It implements the | |
7427 | @code{org.freedesktop.UPower} D-Bus interface, and is notably used by | |
7428 | GNOME. | |
7429 | @end deffn | |
7430 | ||
2b9e0a94 LC |
7431 | @deffn {Scheme Procedure} udisks-service [#:udisks @var{udisks}] |
7432 | Return a service for @uref{http://udisks.freedesktop.org/docs/latest/, | |
7433 | UDisks}, a @dfn{disk management} daemon that provides user interfaces with | |
7434 | notifications and ways to mount/unmount disks. Programs that talk to UDisks | |
7435 | include the @command{udisksctl} command, part of UDisks, and GNOME Disks. | |
7436 | @end deffn | |
7437 | ||
be1c2c54 | 7438 | @deffn {Scheme Procedure} colord-service [#:colord @var{colord}] |
7ce597ff AW |
7439 | Return a service that runs @command{colord}, a system service with a D-Bus |
7440 | interface to manage the color profiles of input and output devices such as | |
7441 | screens and scanners. It is notably used by the GNOME Color Manager graphical | |
7442 | tool. See @uref{http://www.freedesktop.org/software/colord/, the colord web | |
7443 | site} for more information. | |
7444 | @end deffn | |
7445 | ||
cee32ee4 AW |
7446 | @deffn {Scheme Procedure} geoclue-application name [#:allowed? #t] [#:system? #f] [#:users '()] |
7447 | Return an configuration allowing an application to access GeoClue | |
7448 | location data. @var{name} is the Desktop ID of the application, without | |
7449 | the @code{.desktop} part. If @var{allowed?} is true, the application | |
7450 | will have access to location information by default. The boolean | |
7451 | @var{system?} value indicates that an application is a system component | |
7452 | or not. Finally @var{users} is a list of UIDs of all users for which | |
7453 | this application is allowed location info access. An empty users list | |
7454 | means that all users are allowed. | |
7455 | @end deffn | |
7456 | ||
7457 | @defvr {Scheme Variable} %standard-geoclue-applications | |
7458 | The standard list of well-known GeoClue application configurations, | |
7459 | granting authority to GNOME's date-and-time utility to ask for the | |
7460 | current location in order to set the time zone, and allowing the Firefox | |
7461 | (IceCat) and Epiphany web browsers to request location information. | |
7462 | Firefox and Epiphany both query the user before allowing a web page to | |
7463 | know the user's location. | |
7464 | @end defvr | |
7465 | ||
be1c2c54 | 7466 | @deffn {Scheme Procedure} geoclue-service [#:colord @var{colord}] @ |
cee32ee4 AW |
7467 | [#:whitelist '()] @ |
7468 | [#:wifi-geolocation-url "https://location.services.mozilla.com/v1/geolocate?key=geoclue"] @ | |
7469 | [#:submit-data? #f] | |
7470 | [#:wifi-submission-url "https://location.services.mozilla.com/v1/submit?key=geoclue"] @ | |
7471 | [#:submission-nick "geoclue"] @ | |
7472 | [#:applications %standard-geoclue-applications] | |
7473 | Return a service that runs the GeoClue location service. This service | |
7474 | provides a D-Bus interface to allow applications to request access to a | |
7475 | user's physical location, and optionally to add information to online | |
7476 | location databases. See | |
7477 | @uref{https://wiki.freedesktop.org/www/Software/GeoClue/, the GeoClue | |
7478 | web site} for more information. | |
7479 | @end deffn | |
7480 | ||
105369a4 DT |
7481 | @node Database Services |
7482 | @subsubsection Database Services | |
7483 | ||
7484 | The @code{(gnu services databases)} module provides the following service. | |
7485 | ||
be1c2c54 | 7486 | @deffn {Scheme Procedure} postgresql-service [#:postgresql postgresql] @ |
105369a4 DT |
7487 | [#:config-file] [#:data-directory ``/var/lib/postgresql/data''] |
7488 | Return a service that runs @var{postgresql}, the PostgreSQL database | |
7489 | server. | |
7490 | ||
7491 | The PostgreSQL daemon loads its runtime configuration from | |
7492 | @var{config-file} and stores the database cluster in | |
7493 | @var{data-directory}. | |
7494 | @end deffn | |
fe1a39d3 | 7495 | |
d8c18af8 AW |
7496 | @node Mail Services |
7497 | @subsubsection Mail Services | |
7498 | ||
7499 | The @code{(gnu services mail)} module provides Guix service definitions | |
7500 | for mail services. Currently the only implemented service is Dovecot, | |
7501 | an IMAP, POP3, and LMTP server. | |
7502 | ||
7503 | Guix does not yet have a mail transfer agent (MTA), although for some | |
7504 | lightweight purposes the @code{esmtp} relay-only MTA may suffice. Help | |
7505 | is needed to properly integrate a full MTA, such as Postfix. Patches | |
7506 | welcome! | |
7507 | ||
7508 | To add an IMAP/POP3 server to a GuixSD system, add a | |
7509 | @code{dovecot-service} to the operating system definition: | |
7510 | ||
7511 | @deffn {Scheme Procedure} dovecot-service [#:config (dovecot-configuration)] | |
7512 | Return a service that runs the Dovecot IMAP/POP3/LMTP mail server. | |
7513 | @end deffn | |
7514 | ||
7515 | By default, Dovecot doesn't need much configuration; the default | |
7516 | configuration object created by @code{(dovecot-configuration)} will | |
7517 | suffice if your mail is delivered to @code{~/Maildir}. A self-signed | |
7518 | certificate will be generated for TLS-protected connections, though | |
7519 | Dovecot will also listen on cleartext ports by default. There are a | |
7520 | number of options though which mail administrators might need to change, | |
7521 | and as is the case with other services, Guix allows the system | |
7522 | administrator to specify these parameters via a uniform Scheme interface. | |
7523 | ||
7524 | For example, to specify that mail is located at @code{maildir~/.mail}, | |
7525 | one would instantiate the Dovecot service like this: | |
7526 | ||
7527 | @example | |
7528 | (dovecot-service #:config | |
7529 | (dovecot-configuration | |
7530 | (mail-location "maildir:~/.mail"))) | |
7531 | @end example | |
7532 | ||
7533 | The available configuration parameters follow. Each parameter | |
7534 | definition is preceded by its type; for example, @samp{string-list foo} | |
7535 | indicates that the @code{foo} parameter should be specified as a list of | |
7536 | strings. There is also a way to specify the configuration as a string, | |
7537 | if you have an old @code{dovecot.conf} file that you want to port over | |
7538 | from some other system; see the end for more details. | |
7539 | ||
7540 | @c The following documentation was initially generated by | |
7541 | @c (generate-documentation) in (gnu services mail). Manually maintained | |
7542 | @c documentation is better, so we shouldn't hesitate to edit below as | |
7543 | @c needed. However if the change you want to make to this documentation | |
7544 | @c can be done in an automated way, it's probably easier to change | |
7545 | @c (generate-documentation) than to make it below and have to deal with | |
7546 | @c the churn as dovecot updates. | |
7547 | ||
7548 | Available @code{dovecot-configuration} fields are: | |
7549 | ||
7550 | @deftypevr {@code{dovecot-configuration} parameter} package dovecot | |
7551 | The dovecot package. | |
7552 | @end deftypevr | |
7553 | ||
7554 | @deftypevr {@code{dovecot-configuration} parameter} comma-separated-string-list listen | |
7555 | A list of IPs or hosts where to listen in for connections. @samp{*} | |
7556 | listens in all IPv4 interfaces, @samp{::} listens in all IPv6 | |
7557 | interfaces. If you want to specify non-default ports or anything more | |
7558 | complex, customize the address and port fields of the | |
7559 | @samp{inet-listener} of the specific services you are interested in. | |
7560 | @end deftypevr | |
7561 | ||
7562 | @deftypevr {@code{dovecot-configuration} parameter} protocol-configuration-list protocols | |
7563 | List of protocols we want to serve. Available protocols include | |
7564 | @samp{imap}, @samp{pop3}, and @samp{lmtp}. | |
7565 | ||
7566 | Available @code{protocol-configuration} fields are: | |
7567 | ||
7568 | @deftypevr {@code{protocol-configuration} parameter} string name | |
7569 | The name of the protocol. | |
7570 | @end deftypevr | |
7571 | ||
7572 | @deftypevr {@code{protocol-configuration} parameter} string auth-socket-path | |
7573 | UNIX socket path to master authentication server to find users. | |
7574 | This is used by imap (for shared users) and lda. | |
7575 | Defaults to @samp{"/var/run/dovecot/auth-userdb"}. | |
7576 | @end deftypevr | |
7577 | ||
7578 | @deftypevr {@code{protocol-configuration} parameter} space-separated-string-list mail-plugins | |
7579 | Space separated list of plugins to load. | |
7580 | @end deftypevr | |
7581 | ||
7582 | @deftypevr {@code{protocol-configuration} parameter} non-negative-integer mail-max-userip-connections | |
7583 | Maximum number of IMAP connections allowed for a user from each IP | |
7584 | address. NOTE: The username is compared case-sensitively. | |
7585 | Defaults to @samp{10}. | |
7586 | @end deftypevr | |
7587 | ||
7588 | @end deftypevr | |
7589 | ||
7590 | @deftypevr {@code{dovecot-configuration} parameter} service-configuration-list services | |
7591 | List of services to enable. Available services include @samp{imap}, | |
7592 | @samp{imap-login}, @samp{pop3}, @samp{pop3-login}, @samp{auth}, and | |
7593 | @samp{lmtp}. | |
7594 | ||
7595 | Available @code{service-configuration} fields are: | |
7596 | ||
7597 | @deftypevr {@code{service-configuration} parameter} string kind | |
7598 | The service kind. Valid values include @code{director}, | |
7599 | @code{imap-login}, @code{pop3-login}, @code{lmtp}, @code{imap}, | |
7600 | @code{pop3}, @code{auth}, @code{auth-worker}, @code{dict}, | |
7601 | @code{tcpwrap}, @code{quota-warning}, or anything else. | |
7602 | @end deftypevr | |
7603 | ||
7604 | @deftypevr {@code{service-configuration} parameter} listener-configuration-list listeners | |
7605 | Listeners for the service. A listener is either an | |
7606 | @code{unix-listener-configuration}, a @code{fifo-listener-configuration}, or | |
7607 | an @code{inet-listener-configuration}. | |
7608 | Defaults to @samp{()}. | |
7609 | ||
7610 | Available @code{unix-listener-configuration} fields are: | |
7611 | ||
7612 | @deftypevr {@code{unix-listener-configuration} parameter} file-name path | |
7613 | The file name on which to listen. | |
7614 | @end deftypevr | |
7615 | ||
7616 | @deftypevr {@code{unix-listener-configuration} parameter} string mode | |
7617 | The access mode for the socket. | |
7618 | Defaults to @samp{"0600"}. | |
7619 | @end deftypevr | |
7620 | ||
7621 | @deftypevr {@code{unix-listener-configuration} parameter} string user | |
f9b9a033 | 7622 | The user to own the socket. |
d8c18af8 AW |
7623 | Defaults to @samp{""}. |
7624 | @end deftypevr | |
7625 | ||
7626 | @deftypevr {@code{unix-listener-configuration} parameter} string group | |
7627 | The group to own the socket. | |
7628 | Defaults to @samp{""}. | |
7629 | @end deftypevr | |
7630 | ||
7631 | ||
7632 | Available @code{fifo-listener-configuration} fields are: | |
7633 | ||
7634 | @deftypevr {@code{fifo-listener-configuration} parameter} file-name path | |
7635 | The file name on which to listen. | |
7636 | @end deftypevr | |
7637 | ||
7638 | @deftypevr {@code{fifo-listener-configuration} parameter} string mode | |
7639 | The access mode for the socket. | |
7640 | Defaults to @samp{"0600"}. | |
7641 | @end deftypevr | |
7642 | ||
7643 | @deftypevr {@code{fifo-listener-configuration} parameter} string user | |
f9b9a033 | 7644 | The user to own the socket. |
d8c18af8 AW |
7645 | Defaults to @samp{""}. |
7646 | @end deftypevr | |
7647 | ||
7648 | @deftypevr {@code{fifo-listener-configuration} parameter} string group | |
7649 | The group to own the socket. | |
7650 | Defaults to @samp{""}. | |
7651 | @end deftypevr | |
7652 | ||
7653 | ||
7654 | Available @code{inet-listener-configuration} fields are: | |
7655 | ||
7656 | @deftypevr {@code{inet-listener-configuration} parameter} string protocol | |
7657 | The protocol to listen for. | |
7658 | @end deftypevr | |
7659 | ||
7660 | @deftypevr {@code{inet-listener-configuration} parameter} string address | |
7661 | The address on which to listen, or empty for all addresses. | |
7662 | Defaults to @samp{""}. | |
7663 | @end deftypevr | |
7664 | ||
7665 | @deftypevr {@code{inet-listener-configuration} parameter} non-negative-integer port | |
7666 | The port on which to listen. | |
7667 | @end deftypevr | |
7668 | ||
7669 | @deftypevr {@code{inet-listener-configuration} parameter} boolean ssl? | |
7670 | Whether to use SSL for this service; @samp{yes}, @samp{no}, or | |
7671 | @samp{required}. | |
7672 | Defaults to @samp{#t}. | |
7673 | @end deftypevr | |
7674 | ||
7675 | @end deftypevr | |
7676 | ||
7677 | @deftypevr {@code{service-configuration} parameter} non-negative-integer service-count | |
7678 | Number of connections to handle before starting a new process. | |
7679 | Typically the only useful values are 0 (unlimited) or 1. 1 is more | |
7680 | secure, but 0 is faster. <doc/wiki/LoginProcess.txt>. | |
7681 | Defaults to @samp{1}. | |
7682 | @end deftypevr | |
7683 | ||
7684 | @deftypevr {@code{service-configuration} parameter} non-negative-integer process-min-avail | |
7685 | Number of processes to always keep waiting for more connections. | |
7686 | Defaults to @samp{0}. | |
7687 | @end deftypevr | |
7688 | ||
7689 | @deftypevr {@code{service-configuration} parameter} non-negative-integer vsz-limit | |
7690 | If you set @samp{service-count 0}, you probably need to grow | |
7691 | this. | |
7692 | Defaults to @samp{256000000}. | |
7693 | @end deftypevr | |
7694 | ||
7695 | @end deftypevr | |
7696 | ||
7697 | @deftypevr {@code{dovecot-configuration} parameter} dict-configuration dict | |
7698 | Dict configuration, as created by the @code{dict-configuration} | |
7699 | constructor. | |
7700 | ||
7701 | Available @code{dict-configuration} fields are: | |
7702 | ||
7703 | @deftypevr {@code{dict-configuration} parameter} free-form-fields entries | |
7704 | A list of key-value pairs that this dict should hold. | |
7705 | Defaults to @samp{()}. | |
7706 | @end deftypevr | |
7707 | ||
7708 | @end deftypevr | |
7709 | ||
7710 | @deftypevr {@code{dovecot-configuration} parameter} passdb-configuration-list passdbs | |
7711 | List of passdb configurations, each one created by the | |
7712 | @code{passdb-configuration} constructor. | |
7713 | ||
7714 | Available @code{passdb-configuration} fields are: | |
7715 | ||
7716 | @deftypevr {@code{passdb-configuration} parameter} string driver | |
7717 | The driver that the passdb should use. Valid values include | |
7718 | @samp{pam}, @samp{passwd}, @samp{shadow}, @samp{bsdauth}, and | |
7719 | @samp{static}. | |
7720 | Defaults to @samp{"pam"}. | |
7721 | @end deftypevr | |
7722 | ||
7723 | @deftypevr {@code{passdb-configuration} parameter} free-form-args args | |
7724 | A list of key-value args to the passdb driver. | |
7725 | Defaults to @samp{()}. | |
7726 | @end deftypevr | |
7727 | ||
7728 | @end deftypevr | |
7729 | ||
7730 | @deftypevr {@code{dovecot-configuration} parameter} userdb-configuration-list userdbs | |
7731 | List of userdb configurations, each one created by the | |
7732 | @code{userdb-configuration} constructor. | |
7733 | ||
7734 | Available @code{userdb-configuration} fields are: | |
7735 | ||
7736 | @deftypevr {@code{userdb-configuration} parameter} string driver | |
7737 | The driver that the userdb should use. Valid values include | |
7738 | @samp{passwd} and @samp{static}. | |
7739 | Defaults to @samp{"passwd"}. | |
7740 | @end deftypevr | |
7741 | ||
7742 | @deftypevr {@code{userdb-configuration} parameter} free-form-args args | |
7743 | A list of key-value args to the userdb driver. | |
7744 | Defaults to @samp{()}. | |
7745 | @end deftypevr | |
7746 | ||
7747 | @deftypevr {@code{userdb-configuration} parameter} free-form-args override-fields | |
7748 | Override fields from passwd. | |
7749 | Defaults to @samp{()}. | |
7750 | @end deftypevr | |
7751 | ||
7752 | @end deftypevr | |
7753 | ||
7754 | @deftypevr {@code{dovecot-configuration} parameter} plugin-configuration plugin-configuration | |
7755 | Plug-in configuration, created by the @code{plugin-configuration} | |
7756 | constructor. | |
7757 | @end deftypevr | |
7758 | ||
7759 | @deftypevr {@code{dovecot-configuration} parameter} list-of-namespace-configuration namespaces | |
7760 | List of namespaces. Each item in the list is created by the | |
7761 | @code{namespace-configuration} constructor. | |
7762 | ||
7763 | Available @code{namespace-configuration} fields are: | |
7764 | ||
7765 | @deftypevr {@code{namespace-configuration} parameter} string name | |
7766 | Name for this namespace. | |
7767 | @end deftypevr | |
7768 | ||
7769 | @deftypevr {@code{namespace-configuration} parameter} string type | |
7770 | Namespace type: @samp{private}, @samp{shared} or @samp{public}. | |
7771 | Defaults to @samp{"private"}. | |
7772 | @end deftypevr | |
7773 | ||
7774 | @deftypevr {@code{namespace-configuration} parameter} string separator | |
7775 | Hierarchy separator to use. You should use the same separator for | |
7776 | all namespaces or some clients get confused. @samp{/} is usually a good | |
7777 | one. The default however depends on the underlying mail storage | |
7778 | format. | |
7779 | Defaults to @samp{""}. | |
7780 | @end deftypevr | |
7781 | ||
7782 | @deftypevr {@code{namespace-configuration} parameter} string prefix | |
7783 | Prefix required to access this namespace. This needs to be | |
7784 | different for all namespaces. For example @samp{Public/}. | |
7785 | Defaults to @samp{""}. | |
7786 | @end deftypevr | |
7787 | ||
7788 | @deftypevr {@code{namespace-configuration} parameter} string location | |
7789 | Physical location of the mailbox. This is in same format as | |
7790 | mail_location, which is also the default for it. | |
7791 | Defaults to @samp{""}. | |
7792 | @end deftypevr | |
7793 | ||
7794 | @deftypevr {@code{namespace-configuration} parameter} boolean inbox? | |
7795 | There can be only one INBOX, and this setting defines which | |
7796 | namespace has it. | |
7797 | Defaults to @samp{#f}. | |
7798 | @end deftypevr | |
7799 | ||
7800 | @deftypevr {@code{namespace-configuration} parameter} boolean hidden? | |
7801 | If namespace is hidden, it's not advertised to clients via NAMESPACE | |
7802 | extension. You'll most likely also want to set @samp{list? #f}. This is mostly | |
7803 | useful when converting from another server with different namespaces | |
7804 | which you want to deprecate but still keep working. For example you can | |
7805 | create hidden namespaces with prefixes @samp{~/mail/}, @samp{~%u/mail/} | |
7806 | and @samp{mail/}. | |
7807 | Defaults to @samp{#f}. | |
7808 | @end deftypevr | |
7809 | ||
7810 | @deftypevr {@code{namespace-configuration} parameter} boolean list? | |
7811 | Show the mailboxes under this namespace with LIST command. This | |
7812 | makes the namespace visible for clients that don't support NAMESPACE | |
7813 | extension. The special @code{children} value lists child mailboxes, but | |
7814 | hides the namespace prefix. | |
7815 | Defaults to @samp{#t}. | |
7816 | @end deftypevr | |
7817 | ||
7818 | @deftypevr {@code{namespace-configuration} parameter} boolean subscriptions? | |
7819 | Namespace handles its own subscriptions. If set to @code{#f}, the | |
7820 | parent namespace handles them. The empty prefix should always have this | |
7821 | as @code{#t}.) | |
7822 | Defaults to @samp{#t}. | |
7823 | @end deftypevr | |
7824 | ||
7825 | @deftypevr {@code{namespace-configuration} parameter} mailbox-configuration-list mailboxes | |
7826 | List of predefined mailboxes in this namespace. | |
7827 | Defaults to @samp{()}. | |
7828 | ||
7829 | Available @code{mailbox-configuration} fields are: | |
7830 | ||
7831 | @deftypevr {@code{mailbox-configuration} parameter} string name | |
7832 | Name for this mailbox. | |
7833 | @end deftypevr | |
7834 | ||
7835 | @deftypevr {@code{mailbox-configuration} parameter} string auto | |
7836 | @samp{create} will automatically create this mailbox. | |
7837 | @samp{subscribe} will both create and subscribe to the mailbox. | |
7838 | Defaults to @samp{"no"}. | |
7839 | @end deftypevr | |
7840 | ||
7841 | @deftypevr {@code{mailbox-configuration} parameter} space-separated-string-list special-use | |
7842 | List of IMAP @code{SPECIAL-USE} attributes as specified by RFC 6154. | |
7843 | Valid values are @code{\All}, @code{\Archive}, @code{\Drafts}, | |
7844 | @code{\Flagged}, @code{\Junk}, @code{\Sent}, and @code{\Trash}. | |
7845 | Defaults to @samp{()}. | |
7846 | @end deftypevr | |
7847 | ||
7848 | @end deftypevr | |
7849 | ||
7850 | @end deftypevr | |
7851 | ||
7852 | @deftypevr {@code{dovecot-configuration} parameter} file-name base-dir | |
7853 | Base directory where to store runtime data. | |
7854 | Defaults to @samp{"/var/run/dovecot/"}. | |
7855 | @end deftypevr | |
7856 | ||
7857 | @deftypevr {@code{dovecot-configuration} parameter} string login-greeting | |
7858 | Greeting message for clients. | |
7859 | Defaults to @samp{"Dovecot ready."}. | |
7860 | @end deftypevr | |
7861 | ||
7862 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list login-trusted-networks | |
7863 | List of trusted network ranges. Connections from these IPs are | |
7864 | allowed to override their IP addresses and ports (for logging and for | |
7865 | authentication checks). @samp{disable-plaintext-auth} is also ignored | |
7866 | for these networks. Typically you'd specify your IMAP proxy servers | |
7867 | here. | |
7868 | Defaults to @samp{()}. | |
7869 | @end deftypevr | |
7870 | ||
7871 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list login-access-sockets | |
7872 | List of login access check sockets (e.g. tcpwrap). | |
7873 | Defaults to @samp{()}. | |
7874 | @end deftypevr | |
7875 | ||
7876 | @deftypevr {@code{dovecot-configuration} parameter} boolean verbose-proctitle? | |
7877 | Show more verbose process titles (in ps). Currently shows user name | |
7878 | and IP address. Useful for seeing who are actually using the IMAP | |
7879 | processes (e.g. shared mailboxes or if same uid is used for multiple | |
7880 | accounts). | |
7881 | Defaults to @samp{#f}. | |
7882 | @end deftypevr | |
7883 | ||
7884 | @deftypevr {@code{dovecot-configuration} parameter} boolean shutdown-clients? | |
7885 | Should all processes be killed when Dovecot master process shuts down. | |
7886 | Setting this to @code{#f} means that Dovecot can be upgraded without | |
7887 | forcing existing client connections to close (although that could also | |
7888 | be a problem if the upgrade is e.g. because of a security fix). | |
7889 | Defaults to @samp{#t}. | |
7890 | @end deftypevr | |
7891 | ||
7892 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer doveadm-worker-count | |
7893 | If non-zero, run mail commands via this many connections to doveadm | |
7894 | server, instead of running them directly in the same process. | |
7895 | Defaults to @samp{0}. | |
7896 | @end deftypevr | |
7897 | ||
7898 | @deftypevr {@code{dovecot-configuration} parameter} string doveadm-socket-path | |
7899 | UNIX socket or host:port used for connecting to doveadm server. | |
7900 | Defaults to @samp{"doveadm-server"}. | |
7901 | @end deftypevr | |
7902 | ||
7903 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list import-environment | |
7904 | List of environment variables that are preserved on Dovecot startup | |
7905 | and passed down to all of its child processes. You can also give | |
7906 | key=value pairs to always set specific settings. | |
7907 | @end deftypevr | |
7908 | ||
7909 | @deftypevr {@code{dovecot-configuration} parameter} boolean disable-plaintext-auth? | |
7910 | Disable LOGIN command and all other plaintext authentications unless | |
7911 | SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP | |
7912 | matches the local IP (i.e. you're connecting from the same computer), | |
7913 | the connection is considered secure and plaintext authentication is | |
7914 | allowed. See also ssl=required setting. | |
7915 | Defaults to @samp{#t}. | |
7916 | @end deftypevr | |
7917 | ||
7918 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer auth-cache-size | |
7919 | Authentication cache size (e.g. @samp{#e10e6}). 0 means it's disabled. | |
7920 | Note that bsdauth, PAM and vpopmail require @samp{cache-key} to be set | |
7921 | for caching to be used. | |
7922 | Defaults to @samp{0}. | |
7923 | @end deftypevr | |
7924 | ||
7925 | @deftypevr {@code{dovecot-configuration} parameter} string auth-cache-ttl | |
7926 | Time to live for cached data. After TTL expires the cached record | |
7927 | is no longer used, *except* if the main database lookup returns internal | |
7928 | failure. We also try to handle password changes automatically: If | |
7929 | user's previous authentication was successful, but this one wasn't, the | |
7930 | cache isn't used. For now this works only with plaintext | |
7931 | authentication. | |
7932 | Defaults to @samp{"1 hour"}. | |
7933 | @end deftypevr | |
7934 | ||
7935 | @deftypevr {@code{dovecot-configuration} parameter} string auth-cache-negative-ttl | |
7936 | TTL for negative hits (user not found, password mismatch). | |
7937 | 0 disables caching them completely. | |
7938 | Defaults to @samp{"1 hour"}. | |
7939 | @end deftypevr | |
7940 | ||
7941 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list auth-realms | |
7942 | List of realms for SASL authentication mechanisms that need them. | |
7943 | You can leave it empty if you don't want to support multiple realms. | |
7944 | Many clients simply use the first one listed here, so keep the default | |
7945 | realm first. | |
7946 | Defaults to @samp{()}. | |
7947 | @end deftypevr | |
7948 | ||
7949 | @deftypevr {@code{dovecot-configuration} parameter} string auth-default-realm | |
7950 | Default realm/domain to use if none was specified. This is used for | |
7951 | both SASL realms and appending @@domain to username in plaintext | |
7952 | logins. | |
7953 | Defaults to @samp{""}. | |
7954 | @end deftypevr | |
7955 | ||
7956 | @deftypevr {@code{dovecot-configuration} parameter} string auth-username-chars | |
7957 | List of allowed characters in username. If the user-given username | |
7958 | contains a character not listed in here, the login automatically fails. | |
7959 | This is just an extra check to make sure user can't exploit any | |
7960 | potential quote escaping vulnerabilities with SQL/LDAP databases. If | |
7961 | you want to allow all characters, set this value to empty. | |
7962 | Defaults to @samp{"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@@"}. | |
7963 | @end deftypevr | |
7964 | ||
7965 | @deftypevr {@code{dovecot-configuration} parameter} string auth-username-translation | |
7966 | Username character translations before it's looked up from | |
7967 | databases. The value contains series of from -> to characters. For | |
7968 | example @samp{#@@/@@} means that @samp{#} and @samp{/} characters are | |
7969 | translated to @samp{@@}. | |
7970 | Defaults to @samp{""}. | |
7971 | @end deftypevr | |
7972 | ||
7973 | @deftypevr {@code{dovecot-configuration} parameter} string auth-username-format | |
7974 | Username formatting before it's looked up from databases. You can | |
7975 | use the standard variables here, e.g. %Lu would lowercase the username, | |
7976 | %n would drop away the domain if it was given, or @samp{%n-AT-%d} would | |
7977 | change the @samp{@@} into @samp{-AT-}. This translation is done after | |
7978 | @samp{auth-username-translation} changes. | |
7979 | Defaults to @samp{"%Lu"}. | |
7980 | @end deftypevr | |
7981 | ||
7982 | @deftypevr {@code{dovecot-configuration} parameter} string auth-master-user-separator | |
7983 | If you want to allow master users to log in by specifying the master | |
7984 | username within the normal username string (i.e. not using SASL | |
7985 | mechanism's support for it), you can specify the separator character | |
7986 | here. The format is then <username><separator><master username>. | |
7987 | UW-IMAP uses @samp{*} as the separator, so that could be a good | |
7988 | choice. | |
7989 | Defaults to @samp{""}. | |
7990 | @end deftypevr | |
7991 | ||
7992 | @deftypevr {@code{dovecot-configuration} parameter} string auth-anonymous-username | |
7993 | Username to use for users logging in with ANONYMOUS SASL | |
7994 | mechanism. | |
7995 | Defaults to @samp{"anonymous"}. | |
7996 | @end deftypevr | |
7997 | ||
7998 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer auth-worker-max-count | |
7999 | Maximum number of dovecot-auth worker processes. They're used to | |
8000 | execute blocking passdb and userdb queries (e.g. MySQL and PAM). | |
8001 | They're automatically created and destroyed as needed. | |
8002 | Defaults to @samp{30}. | |
8003 | @end deftypevr | |
8004 | ||
8005 | @deftypevr {@code{dovecot-configuration} parameter} string auth-gssapi-hostname | |
8006 | Host name to use in GSSAPI principal names. The default is to use | |
8007 | the name returned by gethostname(). Use @samp{$ALL} (with quotes) to | |
8008 | allow all keytab entries. | |
8009 | Defaults to @samp{""}. | |
8010 | @end deftypevr | |
8011 | ||
8012 | @deftypevr {@code{dovecot-configuration} parameter} string auth-krb5-keytab | |
8013 | Kerberos keytab to use for the GSSAPI mechanism. Will use the | |
8014 | system default (usually /etc/krb5.keytab) if not specified. You may | |
8015 | need to change the auth service to run as root to be able to read this | |
8016 | file. | |
8017 | Defaults to @samp{""}. | |
8018 | @end deftypevr | |
8019 | ||
8020 | @deftypevr {@code{dovecot-configuration} parameter} boolean auth-use-winbind? | |
8021 | Do NTLM and GSS-SPNEGO authentication using Samba's winbind daemon | |
8022 | and @samp{ntlm-auth} helper. | |
8023 | <doc/wiki/Authentication/Mechanisms/Winbind.txt>. | |
8024 | Defaults to @samp{#f}. | |
8025 | @end deftypevr | |
8026 | ||
8027 | @deftypevr {@code{dovecot-configuration} parameter} file-name auth-winbind-helper-path | |
8028 | Path for Samba's @samp{ntlm-auth} helper binary. | |
8029 | Defaults to @samp{"/usr/bin/ntlm_auth"}. | |
8030 | @end deftypevr | |
8031 | ||
8032 | @deftypevr {@code{dovecot-configuration} parameter} string auth-failure-delay | |
8033 | Time to delay before replying to failed authentications. | |
8034 | Defaults to @samp{"2 secs"}. | |
8035 | @end deftypevr | |
8036 | ||
8037 | @deftypevr {@code{dovecot-configuration} parameter} boolean auth-ssl-require-client-cert? | |
8038 | Require a valid SSL client certificate or the authentication | |
8039 | fails. | |
8040 | Defaults to @samp{#f}. | |
8041 | @end deftypevr | |
8042 | ||
8043 | @deftypevr {@code{dovecot-configuration} parameter} boolean auth-ssl-username-from-cert? | |
8044 | Take the username from client's SSL certificate, using | |
8045 | @code{X509_NAME_get_text_by_NID()} which returns the subject's DN's | |
8046 | CommonName. | |
8047 | Defaults to @samp{#f}. | |
8048 | @end deftypevr | |
8049 | ||
8050 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list auth-mechanisms | |
8051 | List of wanted authentication mechanisms. Supported mechanisms are: | |
8052 | @samp{plain}, @samp{login}, @samp{digest-md5}, @samp{cram-md5}, | |
8053 | @samp{ntlm}, @samp{rpa}, @samp{apop}, @samp{anonymous}, @samp{gssapi}, | |
8054 | @samp{otp}, @samp{skey}, and @samp{gss-spnego}. NOTE: See also | |
8055 | @samp{disable-plaintext-auth} setting. | |
8056 | @end deftypevr | |
8057 | ||
8058 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list director-servers | |
8059 | List of IPs or hostnames to all director servers, including ourself. | |
8060 | Ports can be specified as ip:port. The default port is the same as what | |
8061 | director service's @samp{inet-listener} is using. | |
8062 | Defaults to @samp{()}. | |
8063 | @end deftypevr | |
8064 | ||
8065 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list director-mail-servers | |
8066 | List of IPs or hostnames to all backend mail servers. Ranges are | |
8067 | allowed too, like 10.0.0.10-10.0.0.30. | |
8068 | Defaults to @samp{()}. | |
8069 | @end deftypevr | |
8070 | ||
8071 | @deftypevr {@code{dovecot-configuration} parameter} string director-user-expire | |
8072 | How long to redirect users to a specific server after it no longer | |
8073 | has any connections. | |
8074 | Defaults to @samp{"15 min"}. | |
8075 | @end deftypevr | |
8076 | ||
8077 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer director-doveadm-port | |
8078 | TCP/IP port that accepts doveadm connections (instead of director | |
8079 | connections) If you enable this, you'll also need to add | |
8080 | @samp{inet-listener} for the port. | |
8081 | Defaults to @samp{0}. | |
8082 | @end deftypevr | |
8083 | ||
8084 | @deftypevr {@code{dovecot-configuration} parameter} string director-username-hash | |
8085 | How the username is translated before being hashed. Useful values | |
8086 | include %Ln if user can log in with or without @@domain, %Ld if mailboxes | |
8087 | are shared within domain. | |
8088 | Defaults to @samp{"%Lu"}. | |
8089 | @end deftypevr | |
8090 | ||
8091 | @deftypevr {@code{dovecot-configuration} parameter} string log-path | |
8092 | Log file to use for error messages. @samp{syslog} logs to syslog, | |
8093 | @samp{/dev/stderr} logs to stderr. | |
8094 | Defaults to @samp{"syslog"}. | |
8095 | @end deftypevr | |
8096 | ||
8097 | @deftypevr {@code{dovecot-configuration} parameter} string info-log-path | |
8098 | Log file to use for informational messages. Defaults to | |
8099 | @samp{log-path}. | |
8100 | Defaults to @samp{""}. | |
8101 | @end deftypevr | |
8102 | ||
8103 | @deftypevr {@code{dovecot-configuration} parameter} string debug-log-path | |
8104 | Log file to use for debug messages. Defaults to | |
8105 | @samp{info-log-path}. | |
8106 | Defaults to @samp{""}. | |
8107 | @end deftypevr | |
8108 | ||
8109 | @deftypevr {@code{dovecot-configuration} parameter} string syslog-facility | |
8110 | Syslog facility to use if you're logging to syslog. Usually if you | |
8111 | don't want to use @samp{mail}, you'll use local0..local7. Also other | |
8112 | standard facilities are supported. | |
8113 | Defaults to @samp{"mail"}. | |
8114 | @end deftypevr | |
8115 | ||
8116 | @deftypevr {@code{dovecot-configuration} parameter} boolean auth-verbose? | |
8117 | Log unsuccessful authentication attempts and the reasons why they | |
8118 | failed. | |
8119 | Defaults to @samp{#f}. | |
8120 | @end deftypevr | |
8121 | ||
8122 | @deftypevr {@code{dovecot-configuration} parameter} boolean auth-verbose-passwords? | |
8123 | In case of password mismatches, log the attempted password. Valid | |
8124 | values are no, plain and sha1. sha1 can be useful for detecting brute | |
8125 | force password attempts vs. user simply trying the same password over | |
8126 | and over again. You can also truncate the value to n chars by appending | |
8127 | ":n" (e.g. sha1:6). | |
8128 | Defaults to @samp{#f}. | |
8129 | @end deftypevr | |
8130 | ||
8131 | @deftypevr {@code{dovecot-configuration} parameter} boolean auth-debug? | |
8132 | Even more verbose logging for debugging purposes. Shows for example | |
8133 | SQL queries. | |
8134 | Defaults to @samp{#f}. | |
8135 | @end deftypevr | |
8136 | ||
8137 | @deftypevr {@code{dovecot-configuration} parameter} boolean auth-debug-passwords? | |
8138 | In case of password mismatches, log the passwords and used scheme so | |
8139 | the problem can be debugged. Enabling this also enables | |
8140 | @samp{auth-debug}. | |
8141 | Defaults to @samp{#f}. | |
8142 | @end deftypevr | |
8143 | ||
8144 | @deftypevr {@code{dovecot-configuration} parameter} boolean mail-debug? | |
8145 | Enable mail process debugging. This can help you figure out why | |
8146 | Dovecot isn't finding your mails. | |
8147 | Defaults to @samp{#f}. | |
8148 | @end deftypevr | |
8149 | ||
8150 | @deftypevr {@code{dovecot-configuration} parameter} boolean verbose-ssl? | |
8151 | Show protocol level SSL errors. | |
8152 | Defaults to @samp{#f}. | |
8153 | @end deftypevr | |
8154 | ||
8155 | @deftypevr {@code{dovecot-configuration} parameter} string log-timestamp | |
8156 | Prefix for each line written to log file. % codes are in | |
8157 | strftime(3) format. | |
8158 | Defaults to @samp{"\"%b %d %H:%M:%S \""}. | |
8159 | @end deftypevr | |
8160 | ||
8161 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list login-log-format-elements | |
8162 | List of elements we want to log. The elements which have a | |
8163 | non-empty variable value are joined together to form a comma-separated | |
8164 | string. | |
8165 | @end deftypevr | |
8166 | ||
8167 | @deftypevr {@code{dovecot-configuration} parameter} string login-log-format | |
8168 | Login log format. %s contains @samp{login-log-format-elements} | |
8169 | string, %$ contains the data we want to log. | |
8170 | Defaults to @samp{"%$: %s"}. | |
8171 | @end deftypevr | |
8172 | ||
8173 | @deftypevr {@code{dovecot-configuration} parameter} string mail-log-prefix | |
8174 | Log prefix for mail processes. See doc/wiki/Variables.txt for list | |
8175 | of possible variables you can use. | |
8176 | Defaults to @samp{"\"%s(%u): \""}. | |
8177 | @end deftypevr | |
8178 | ||
8179 | @deftypevr {@code{dovecot-configuration} parameter} string deliver-log-format | |
8180 | Format to use for logging mail deliveries. You can use variables: | |
8181 | @table @code | |
8182 | @item %$ | |
8183 | Delivery status message (e.g. @samp{saved to INBOX}) | |
8184 | @item %m | |
8185 | Message-ID | |
8186 | @item %s | |
8187 | Subject | |
8188 | @item %f | |
8189 | From address | |
8190 | @item %p | |
8191 | Physical size | |
8192 | @item %w | |
8193 | Virtual size. | |
8194 | @end table | |
8195 | Defaults to @samp{"msgid=%m: %$"}. | |
8196 | @end deftypevr | |
8197 | ||
8198 | @deftypevr {@code{dovecot-configuration} parameter} string mail-location | |
8199 | Location for users' mailboxes. The default is empty, which means | |
8200 | that Dovecot tries to find the mailboxes automatically. This won't work | |
8201 | if the user doesn't yet have any mail, so you should explicitly tell | |
8202 | Dovecot the full location. | |
8203 | ||
8204 | If you're using mbox, giving a path to the INBOX | |
8205 | file (e.g. /var/mail/%u) isn't enough. You'll also need to tell Dovecot | |
8206 | where the other mailboxes are kept. This is called the "root mail | |
8207 | directory", and it must be the first path given in the | |
8208 | @samp{mail-location} setting. | |
8209 | ||
8210 | There are a few special variables you can use, eg.: | |
8211 | ||
8212 | @table @samp | |
8213 | @item %u | |
8214 | username | |
8215 | @item %n | |
8216 | user part in user@@domain, same as %u if there's no domain | |
8217 | @item %d | |
8218 | domain part in user@@domain, empty if there's no domain | |
8219 | @item %h | |
8220 | home director | |
8221 | @end table | |
8222 | ||
8223 | See doc/wiki/Variables.txt for full list. Some examples: | |
8224 | @table @samp | |
8225 | @item maildir:~/Maildir | |
8226 | @item mbox:~/mail:INBOX=/var/mail/%u | |
8227 | @item mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/% | |
8228 | @end table | |
8229 | Defaults to @samp{""}. | |
8230 | @end deftypevr | |
8231 | ||
8232 | @deftypevr {@code{dovecot-configuration} parameter} string mail-uid | |
8233 | System user and group used to access mails. If you use multiple, | |
8234 | userdb can override these by returning uid or gid fields. You can use | |
8235 | either numbers or names. <doc/wiki/UserIds.txt>. | |
8236 | Defaults to @samp{""}. | |
8237 | @end deftypevr | |
8238 | ||
8239 | @deftypevr {@code{dovecot-configuration} parameter} string mail-gid | |
8240 | ||
8241 | Defaults to @samp{""}. | |
8242 | @end deftypevr | |
8243 | ||
8244 | @deftypevr {@code{dovecot-configuration} parameter} string mail-privileged-group | |
8245 | Group to enable temporarily for privileged operations. Currently | |
8246 | this is used only with INBOX when either its initial creation or | |
8247 | dotlocking fails. Typically this is set to "mail" to give access to | |
8248 | /var/mail. | |
8249 | Defaults to @samp{""}. | |
8250 | @end deftypevr | |
8251 | ||
8252 | @deftypevr {@code{dovecot-configuration} parameter} string mail-access-groups | |
8253 | Grant access to these supplementary groups for mail processes. | |
8254 | Typically these are used to set up access to shared mailboxes. Note | |
8255 | that it may be dangerous to set these if users can create | |
8256 | symlinks (e.g. if "mail" group is set here, ln -s /var/mail ~/mail/var | |
8257 | could allow a user to delete others' mailboxes, or ln -s | |
8258 | /secret/shared/box ~/mail/mybox would allow reading it). | |
8259 | Defaults to @samp{""}. | |
8260 | @end deftypevr | |
8261 | ||
8262 | @deftypevr {@code{dovecot-configuration} parameter} boolean mail-full-filesystem-access? | |
8263 | Allow full filesystem access to clients. There's no access checks | |
8264 | other than what the operating system does for the active UID/GID. It | |
8265 | works with both maildir and mboxes, allowing you to prefix mailboxes | |
8266 | names with e.g. /path/ or ~user/. | |
8267 | Defaults to @samp{#f}. | |
8268 | @end deftypevr | |
8269 | ||
8270 | @deftypevr {@code{dovecot-configuration} parameter} boolean mmap-disable? | |
8271 | Don't use mmap() at all. This is required if you store indexes to | |
8272 | shared filesystems (NFS or clustered filesystem). | |
8273 | Defaults to @samp{#f}. | |
8274 | @end deftypevr | |
8275 | ||
8276 | @deftypevr {@code{dovecot-configuration} parameter} boolean dotlock-use-excl? | |
8277 | Rely on @samp{O_EXCL} to work when creating dotlock files. NFS | |
8278 | supports @samp{O_EXCL} since version 3, so this should be safe to use | |
8279 | nowadays by default. | |
8280 | Defaults to @samp{#t}. | |
8281 | @end deftypevr | |
8282 | ||
8283 | @deftypevr {@code{dovecot-configuration} parameter} string mail-fsync | |
8284 | When to use fsync() or fdatasync() calls: | |
8285 | @table @code | |
8286 | @item optimized | |
8287 | Whenever necessary to avoid losing important data | |
8288 | @item always | |
8289 | Useful with e.g. NFS when write()s are delayed | |
8290 | @item never | |
8291 | Never use it (best performance, but crashes can lose data). | |
8292 | @end table | |
8293 | Defaults to @samp{"optimized"}. | |
8294 | @end deftypevr | |
8295 | ||
8296 | @deftypevr {@code{dovecot-configuration} parameter} boolean mail-nfs-storage? | |
8297 | Mail storage exists in NFS. Set this to yes to make Dovecot flush | |
8298 | NFS caches whenever needed. If you're using only a single mail server | |
8299 | this isn't needed. | |
8300 | Defaults to @samp{#f}. | |
8301 | @end deftypevr | |
8302 | ||
8303 | @deftypevr {@code{dovecot-configuration} parameter} boolean mail-nfs-index? | |
8304 | Mail index files also exist in NFS. Setting this to yes requires | |
8305 | @samp{mmap-disable? #t} and @samp{fsync-disable? #f}. | |
8306 | Defaults to @samp{#f}. | |
8307 | @end deftypevr | |
8308 | ||
8309 | @deftypevr {@code{dovecot-configuration} parameter} string lock-method | |
8310 | Locking method for index files. Alternatives are fcntl, flock and | |
8311 | dotlock. Dotlocking uses some tricks which may create more disk I/O | |
8312 | than other locking methods. NFS users: flock doesn't work, remember to | |
8313 | change @samp{mmap-disable}. | |
8314 | Defaults to @samp{"fcntl"}. | |
8315 | @end deftypevr | |
8316 | ||
8317 | @deftypevr {@code{dovecot-configuration} parameter} file-name mail-temp-dir | |
8318 | Directory in which LDA/LMTP temporarily stores incoming mails >128 | |
8319 | kB. | |
8320 | Defaults to @samp{"/tmp"}. | |
8321 | @end deftypevr | |
8322 | ||
8323 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer first-valid-uid | |
8324 | Valid UID range for users. This is mostly to make sure that users can't | |
8325 | log in as daemons or other system users. Note that denying root logins is | |
8326 | hardcoded to dovecot binary and can't be done even if @samp{first-valid-uid} | |
8327 | is set to 0. | |
8328 | Defaults to @samp{500}. | |
8329 | @end deftypevr | |
8330 | ||
8331 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer last-valid-uid | |
8332 | ||
8333 | Defaults to @samp{0}. | |
8334 | @end deftypevr | |
8335 | ||
8336 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer first-valid-gid | |
8337 | Valid GID range for users. Users having non-valid GID as primary group ID | |
8338 | aren't allowed to log in. If user belongs to supplementary groups with | |
8339 | non-valid GIDs, those groups are not set. | |
8340 | Defaults to @samp{1}. | |
8341 | @end deftypevr | |
8342 | ||
8343 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer last-valid-gid | |
8344 | ||
8345 | Defaults to @samp{0}. | |
8346 | @end deftypevr | |
8347 | ||
8348 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mail-max-keyword-length | |
8349 | Maximum allowed length for mail keyword name. It's only forced when | |
8350 | trying to create new keywords. | |
8351 | Defaults to @samp{50}. | |
8352 | @end deftypevr | |
8353 | ||
8354 | @deftypevr {@code{dovecot-configuration} parameter} colon-separated-file-name-list valid-chroot-dirs | |
8355 | List of directories under which chrooting is allowed for mail | |
8356 | processes (i.e. /var/mail will allow chrooting to /var/mail/foo/bar | |
8357 | too). This setting doesn't affect @samp{login-chroot} | |
8358 | @samp{mail-chroot} or auth chroot settings. If this setting is empty, | |
8359 | "/./" in home dirs are ignored. WARNING: Never add directories here | |
8360 | which local users can modify, that may lead to root exploit. Usually | |
8361 | this should be done only if you don't allow shell access for users. | |
8362 | <doc/wiki/Chrooting.txt>. | |
8363 | Defaults to @samp{()}. | |
8364 | @end deftypevr | |
8365 | ||
8366 | @deftypevr {@code{dovecot-configuration} parameter} string mail-chroot | |
8367 | Default chroot directory for mail processes. This can be overridden | |
8368 | for specific users in user database by giving /./ in user's home | |
8369 | directory (e.g. /home/./user chroots into /home). Note that usually | |
8370 | there is no real need to do chrooting, Dovecot doesn't allow users to | |
8371 | access files outside their mail directory anyway. If your home | |
8372 | directories are prefixed with the chroot directory, append "/." to | |
8373 | @samp{mail-chroot}. <doc/wiki/Chrooting.txt>. | |
8374 | Defaults to @samp{""}. | |
8375 | @end deftypevr | |
8376 | ||
8377 | @deftypevr {@code{dovecot-configuration} parameter} file-name auth-socket-path | |
8378 | UNIX socket path to master authentication server to find users. | |
8379 | This is used by imap (for shared users) and lda. | |
8380 | Defaults to @samp{"/var/run/dovecot/auth-userdb"}. | |
8381 | @end deftypevr | |
8382 | ||
8383 | @deftypevr {@code{dovecot-configuration} parameter} file-name mail-plugin-dir | |
8384 | Directory where to look up mail plugins. | |
8385 | Defaults to @samp{"/usr/lib/dovecot"}. | |
8386 | @end deftypevr | |
8387 | ||
8388 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mail-plugins | |
8389 | List of plugins to load for all services. Plugins specific to IMAP, | |
8390 | LDA, etc. are added to this list in their own .conf files. | |
8391 | Defaults to @samp{()}. | |
8392 | @end deftypevr | |
8393 | ||
8394 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mail-cache-min-mail-count | |
8395 | The minimum number of mails in a mailbox before updates are done to | |
8396 | cache file. This allows optimizing Dovecot's behavior to do less disk | |
8397 | writes at the cost of more disk reads. | |
8398 | Defaults to @samp{0}. | |
8399 | @end deftypevr | |
8400 | ||
8401 | @deftypevr {@code{dovecot-configuration} parameter} string mailbox-idle-check-interval | |
8402 | When IDLE command is running, mailbox is checked once in a while to | |
8403 | see if there are any new mails or other changes. This setting defines | |
8404 | the minimum time to wait between those checks. Dovecot can also use | |
8405 | dnotify, inotify and kqueue to find out immediately when changes | |
8406 | occur. | |
8407 | Defaults to @samp{"30 secs"}. | |
8408 | @end deftypevr | |
8409 | ||
8410 | @deftypevr {@code{dovecot-configuration} parameter} boolean mail-save-crlf? | |
8411 | Save mails with CR+LF instead of plain LF. This makes sending those | |
8412 | mails take less CPU, especially with sendfile() syscall with Linux and | |
8413 | FreeBSD. But it also creates a bit more disk I/O which may just make it | |
8414 | slower. Also note that if other software reads the mboxes/maildirs, | |
8415 | they may handle the extra CRs wrong and cause problems. | |
8416 | Defaults to @samp{#f}. | |
8417 | @end deftypevr | |
8418 | ||
8419 | @deftypevr {@code{dovecot-configuration} parameter} boolean maildir-stat-dirs? | |
8420 | By default LIST command returns all entries in maildir beginning | |
8421 | with a dot. Enabling this option makes Dovecot return only entries | |
8422 | which are directories. This is done by stat()ing each entry, so it | |
8423 | causes more disk I/O. | |
8424 | (For systems setting struct @samp{dirent->d_type} this check is free | |
8425 | and it's done always regardless of this setting). | |
8426 | Defaults to @samp{#f}. | |
8427 | @end deftypevr | |
8428 | ||
8429 | @deftypevr {@code{dovecot-configuration} parameter} boolean maildir-copy-with-hardlinks? | |
8430 | When copying a message, do it with hard links whenever possible. | |
8431 | This makes the performance much better, and it's unlikely to have any | |
8432 | side effects. | |
8433 | Defaults to @samp{#t}. | |
8434 | @end deftypevr | |
8435 | ||
8436 | @deftypevr {@code{dovecot-configuration} parameter} boolean maildir-very-dirty-syncs? | |
8437 | Assume Dovecot is the only MUA accessing Maildir: Scan cur/ | |
8438 | directory only when its mtime changes unexpectedly or when we can't find | |
8439 | the mail otherwise. | |
8440 | Defaults to @samp{#f}. | |
8441 | @end deftypevr | |
8442 | ||
8443 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mbox-read-locks | |
8444 | Which locking methods to use for locking mbox. There are four | |
8445 | available: | |
8446 | ||
8447 | @table @code | |
8448 | @item dotlock | |
8449 | Create <mailbox>.lock file. This is the oldest and most NFS-safe | |
8450 | solution. If you want to use /var/mail/ like directory, the users will | |
8451 | need write access to that directory. | |
8452 | @item dotlock-try | |
8453 | Same as dotlock, but if it fails because of permissions or because there | |
8454 | isn't enough disk space, just skip it. | |
8455 | @item fcntl | |
8456 | Use this if possible. Works with NFS too if lockd is used. | |
8457 | @item flock | |
8458 | May not exist in all systems. Doesn't work with NFS. | |
8459 | @item lockf | |
8460 | May not exist in all systems. Doesn't work with NFS. | |
8461 | @end table | |
8462 | ||
8463 | You can use multiple locking methods; if you do the order they're declared | |
8464 | in is important to avoid deadlocks if other MTAs/MUAs are using multiple | |
8465 | locking methods as well. Some operating systems don't allow using some of | |
8466 | them simultaneously. | |
8467 | @end deftypevr | |
8468 | ||
8469 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mbox-write-locks | |
8470 | ||
8471 | @end deftypevr | |
8472 | ||
8473 | @deftypevr {@code{dovecot-configuration} parameter} string mbox-lock-timeout | |
8474 | Maximum time to wait for lock (all of them) before aborting. | |
8475 | Defaults to @samp{"5 mins"}. | |
8476 | @end deftypevr | |
8477 | ||
8478 | @deftypevr {@code{dovecot-configuration} parameter} string mbox-dotlock-change-timeout | |
8479 | If dotlock exists but the mailbox isn't modified in any way, | |
8480 | override the lock file after this much time. | |
8481 | Defaults to @samp{"2 mins"}. | |
8482 | @end deftypevr | |
8483 | ||
8484 | @deftypevr {@code{dovecot-configuration} parameter} boolean mbox-dirty-syncs? | |
8485 | When mbox changes unexpectedly we have to fully read it to find out | |
8486 | what changed. If the mbox is large this can take a long time. Since | |
8487 | the change is usually just a newly appended mail, it'd be faster to | |
8488 | simply read the new mails. If this setting is enabled, Dovecot does | |
8489 | this but still safely fallbacks to re-reading the whole mbox file | |
8490 | whenever something in mbox isn't how it's expected to be. The only real | |
8491 | downside to this setting is that if some other MUA changes message | |
8492 | flags, Dovecot doesn't notice it immediately. Note that a full sync is | |
8493 | done with SELECT, EXAMINE, EXPUNGE and CHECK commands. | |
8494 | Defaults to @samp{#t}. | |
8495 | @end deftypevr | |
8496 | ||
8497 | @deftypevr {@code{dovecot-configuration} parameter} boolean mbox-very-dirty-syncs? | |
8498 | Like @samp{mbox-dirty-syncs}, but don't do full syncs even with SELECT, | |
8499 | EXAMINE, EXPUNGE or CHECK commands. If this is set, | |
8500 | @samp{mbox-dirty-syncs} is ignored. | |
8501 | Defaults to @samp{#f}. | |
8502 | @end deftypevr | |
8503 | ||
8504 | @deftypevr {@code{dovecot-configuration} parameter} boolean mbox-lazy-writes? | |
8505 | Delay writing mbox headers until doing a full write sync (EXPUNGE | |
8506 | and CHECK commands and when closing the mailbox). This is especially | |
8507 | useful for POP3 where clients often delete all mails. The downside is | |
8508 | that our changes aren't immediately visible to other MUAs. | |
8509 | Defaults to @samp{#t}. | |
8510 | @end deftypevr | |
8511 | ||
8512 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mbox-min-index-size | |
8513 | If mbox size is smaller than this (e.g. 100k), don't write index | |
8514 | files. If an index file already exists it's still read, just not | |
8515 | updated. | |
8516 | Defaults to @samp{0}. | |
8517 | @end deftypevr | |
8518 | ||
8519 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mdbox-rotate-size | |
8520 | Maximum dbox file size until it's rotated. | |
8521 | Defaults to @samp{2000000}. | |
8522 | @end deftypevr | |
8523 | ||
8524 | @deftypevr {@code{dovecot-configuration} parameter} string mdbox-rotate-interval | |
8525 | Maximum dbox file age until it's rotated. Typically in days. Day | |
8526 | begins from midnight, so 1d = today, 2d = yesterday, etc. 0 = check | |
8527 | disabled. | |
8528 | Defaults to @samp{"1d"}. | |
8529 | @end deftypevr | |
8530 | ||
8531 | @deftypevr {@code{dovecot-configuration} parameter} boolean mdbox-preallocate-space? | |
8532 | When creating new mdbox files, immediately preallocate their size to | |
8533 | @samp{mdbox-rotate-size}. This setting currently works only in Linux | |
8534 | with some filesystems (ext4, xfs). | |
8535 | Defaults to @samp{#f}. | |
8536 | @end deftypevr | |
8537 | ||
8538 | @deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-dir | |
8539 | sdbox and mdbox support saving mail attachments to external files, | |
8540 | which also allows single instance storage for them. Other backends | |
8541 | don't support this for now. | |
8542 | ||
8543 | WARNING: This feature hasn't been tested much yet. Use at your own risk. | |
8544 | ||
8545 | Directory root where to store mail attachments. Disabled, if empty. | |
8546 | Defaults to @samp{""}. | |
8547 | @end deftypevr | |
8548 | ||
8549 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mail-attachment-min-size | |
8550 | Attachments smaller than this aren't saved externally. It's also | |
8551 | possible to write a plugin to disable saving specific attachments | |
8552 | externally. | |
8553 | Defaults to @samp{128000}. | |
8554 | @end deftypevr | |
8555 | ||
8556 | @deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-fs | |
8557 | Filesystem backend to use for saving attachments: | |
8558 | @table @code | |
8559 | @item posix | |
8560 | No SiS done by Dovecot (but this might help FS's own deduplication) | |
8561 | @item sis posix | |
8562 | SiS with immediate byte-by-byte comparison during saving | |
8563 | @item sis-queue posix | |
8564 | SiS with delayed comparison and deduplication. | |
8565 | @end table | |
8566 | Defaults to @samp{"sis posix"}. | |
8567 | @end deftypevr | |
8568 | ||
8569 | @deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-hash | |
8570 | Hash format to use in attachment filenames. You can add any text and | |
8571 | variables: @code{%@{md4@}}, @code{%@{md5@}}, @code{%@{sha1@}}, | |
8572 | @code{%@{sha256@}}, @code{%@{sha512@}}, @code{%@{size@}}. Variables can be | |
8573 | truncated, e.g. @code{%@{sha256:80@}} returns only first 80 bits. | |
8574 | Defaults to @samp{"%@{sha1@}"}. | |
8575 | @end deftypevr | |
8576 | ||
8577 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-process-limit | |
8578 | ||
8579 | Defaults to @samp{100}. | |
8580 | @end deftypevr | |
8581 | ||
8582 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-client-limit | |
8583 | ||
8584 | Defaults to @samp{1000}. | |
8585 | @end deftypevr | |
8586 | ||
8587 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-vsz-limit | |
8588 | Default VSZ (virtual memory size) limit for service processes. | |
8589 | This is mainly intended to catch and kill processes that leak memory | |
8590 | before they eat up everything. | |
8591 | Defaults to @samp{256000000}. | |
8592 | @end deftypevr | |
8593 | ||
8594 | @deftypevr {@code{dovecot-configuration} parameter} string default-login-user | |
8595 | Login user is internally used by login processes. This is the most | |
8596 | untrusted user in Dovecot system. It shouldn't have access to anything | |
8597 | at all. | |
8598 | Defaults to @samp{"dovenull"}. | |
8599 | @end deftypevr | |
8600 | ||
8601 | @deftypevr {@code{dovecot-configuration} parameter} string default-internal-user | |
8602 | Internal user is used by unprivileged processes. It should be | |
8603 | separate from login user, so that login processes can't disturb other | |
8604 | processes. | |
8605 | Defaults to @samp{"dovecot"}. | |
8606 | @end deftypevr | |
8607 | ||
8608 | @deftypevr {@code{dovecot-configuration} parameter} string ssl? | |
8609 | SSL/TLS support: yes, no, required. <doc/wiki/SSL.txt>. | |
8610 | Defaults to @samp{"required"}. | |
8611 | @end deftypevr | |
8612 | ||
8613 | @deftypevr {@code{dovecot-configuration} parameter} string ssl-cert | |
8614 | PEM encoded X.509 SSL/TLS certificate (public key). | |
8615 | Defaults to @samp{"</etc/dovecot/default.pem"}. | |
8616 | @end deftypevr | |
8617 | ||
8618 | @deftypevr {@code{dovecot-configuration} parameter} string ssl-key | |
8619 | PEM encoded SSL/TLS private key. The key is opened before | |
8620 | dropping root privileges, so keep the key file unreadable by anyone but | |
8621 | root. | |
8622 | Defaults to @samp{"</etc/dovecot/private/default.pem"}. | |
8623 | @end deftypevr | |
8624 | ||
8625 | @deftypevr {@code{dovecot-configuration} parameter} string ssl-key-password | |
8626 | If key file is password protected, give the password here. | |
8627 | Alternatively give it when starting dovecot with -p parameter. Since | |
8628 | this file is often world-readable, you may want to place this setting | |
8629 | instead to a different. | |
8630 | Defaults to @samp{""}. | |
8631 | @end deftypevr | |
8632 | ||
8633 | @deftypevr {@code{dovecot-configuration} parameter} string ssl-ca | |
8634 | PEM encoded trusted certificate authority. Set this only if you | |
8635 | intend to use @samp{ssl-verify-client-cert? #t}. The file should | |
8636 | contain the CA certificate(s) followed by the matching | |
8637 | CRL(s). (e.g. @samp{ssl-ca </etc/ssl/certs/ca.pem}). | |
8638 | Defaults to @samp{""}. | |
8639 | @end deftypevr | |
8640 | ||
8641 | @deftypevr {@code{dovecot-configuration} parameter} boolean ssl-require-crl? | |
8642 | Require that CRL check succeeds for client certificates. | |
8643 | Defaults to @samp{#t}. | |
8644 | @end deftypevr | |
8645 | ||
8646 | @deftypevr {@code{dovecot-configuration} parameter} boolean ssl-verify-client-cert? | |
8647 | Request client to send a certificate. If you also want to require | |
8648 | it, set @samp{auth-ssl-require-client-cert? #t} in auth section. | |
8649 | Defaults to @samp{#f}. | |
8650 | @end deftypevr | |
8651 | ||
8652 | @deftypevr {@code{dovecot-configuration} parameter} string ssl-cert-username-field | |
8653 | Which field from certificate to use for username. commonName and | |
8654 | x500UniqueIdentifier are the usual choices. You'll also need to set | |
8655 | @samp{auth-ssl-username-from-cert? #t}. | |
8656 | Defaults to @samp{"commonName"}. | |
8657 | @end deftypevr | |
8658 | ||
8659 | @deftypevr {@code{dovecot-configuration} parameter} hours ssl-parameters-regenerate | |
8660 | How often to regenerate the SSL parameters file. Generation is | |
8661 | quite CPU intensive operation. The value is in hours, 0 disables | |
8662 | regeneration entirely. | |
8663 | Defaults to @samp{168}. | |
8664 | @end deftypevr | |
8665 | ||
8666 | @deftypevr {@code{dovecot-configuration} parameter} string ssl-protocols | |
8667 | SSL protocols to use. | |
8668 | Defaults to @samp{"!SSLv2"}. | |
8669 | @end deftypevr | |
8670 | ||
8671 | @deftypevr {@code{dovecot-configuration} parameter} string ssl-cipher-list | |
8672 | SSL ciphers to use. | |
8673 | Defaults to @samp{"ALL:!LOW:!SSLv2:!EXP:!aNULL"}. | |
8674 | @end deftypevr | |
8675 | ||
8676 | @deftypevr {@code{dovecot-configuration} parameter} string ssl-crypto-device | |
8677 | SSL crypto device to use, for valid values run "openssl engine". | |
8678 | Defaults to @samp{""}. | |
8679 | @end deftypevr | |
8680 | ||
8681 | @deftypevr {@code{dovecot-configuration} parameter} string postmaster-address | |
8682 | Address to use when sending rejection mails. | |
8683 | Default is postmaster@@<your domain>. %d expands to recipient domain. | |
8684 | Defaults to @samp{""}. | |
8685 | @end deftypevr | |
8686 | ||
8687 | @deftypevr {@code{dovecot-configuration} parameter} string hostname | |
8688 | Hostname to use in various parts of sent mails (e.g. in Message-Id) | |
8689 | and in LMTP replies. Default is the system's real hostname@@domain. | |
8690 | Defaults to @samp{""}. | |
8691 | @end deftypevr | |
8692 | ||
8693 | @deftypevr {@code{dovecot-configuration} parameter} boolean quota-full-tempfail? | |
8694 | If user is over quota, return with temporary failure instead of | |
8695 | bouncing the mail. | |
8696 | Defaults to @samp{#f}. | |
8697 | @end deftypevr | |
8698 | ||
8699 | @deftypevr {@code{dovecot-configuration} parameter} file-name sendmail-path | |
8700 | Binary to use for sending mails. | |
8701 | Defaults to @samp{"/usr/sbin/sendmail"}. | |
8702 | @end deftypevr | |
8703 | ||
8704 | @deftypevr {@code{dovecot-configuration} parameter} string submission-host | |
8705 | If non-empty, send mails via this SMTP host[:port] instead of | |
8706 | sendmail. | |
8707 | Defaults to @samp{""}. | |
8708 | @end deftypevr | |
8709 | ||
8710 | @deftypevr {@code{dovecot-configuration} parameter} string rejection-subject | |
8711 | Subject: header to use for rejection mails. You can use the same | |
8712 | variables as for @samp{rejection-reason} below. | |
8713 | Defaults to @samp{"Rejected: %s"}. | |
8714 | @end deftypevr | |
8715 | ||
8716 | @deftypevr {@code{dovecot-configuration} parameter} string rejection-reason | |
8717 | Human readable error message for rejection mails. You can use | |
8718 | variables: | |
8719 | ||
8720 | @table @code | |
8721 | @item %n | |
8722 | CRLF | |
8723 | @item %r | |
8724 | reason | |
8725 | @item %s | |
8726 | original subject | |
8727 | @item %t | |
8728 | recipient | |
8729 | @end table | |
8730 | Defaults to @samp{"Your message to <%t> was automatically rejected:%n%r"}. | |
8731 | @end deftypevr | |
8732 | ||
8733 | @deftypevr {@code{dovecot-configuration} parameter} string recipient-delimiter | |
8734 | Delimiter character between local-part and detail in email | |
8735 | address. | |
8736 | Defaults to @samp{"+"}. | |
8737 | @end deftypevr | |
8738 | ||
8739 | @deftypevr {@code{dovecot-configuration} parameter} string lda-original-recipient-header | |
8740 | Header where the original recipient address (SMTP's RCPT TO: | |
8741 | address) is taken from if not available elsewhere. With dovecot-lda -a | |
8742 | parameter overrides this. A commonly used header for this is | |
8743 | X-Original-To. | |
8744 | Defaults to @samp{""}. | |
8745 | @end deftypevr | |
8746 | ||
8747 | @deftypevr {@code{dovecot-configuration} parameter} boolean lda-mailbox-autocreate? | |
8748 | Should saving a mail to a nonexistent mailbox automatically create | |
8749 | it?. | |
8750 | Defaults to @samp{#f}. | |
8751 | @end deftypevr | |
8752 | ||
8753 | @deftypevr {@code{dovecot-configuration} parameter} boolean lda-mailbox-autosubscribe? | |
8754 | Should automatically created mailboxes be also automatically | |
8755 | subscribed?. | |
8756 | Defaults to @samp{#f}. | |
8757 | @end deftypevr | |
8758 | ||
8759 | @deftypevr {@code{dovecot-configuration} parameter} non-negative-integer imap-max-line-length | |
8760 | Maximum IMAP command line length. Some clients generate very long | |
8761 | command lines with huge mailboxes, so you may need to raise this if you | |
8762 | get "Too long argument" or "IMAP command line too large" errors | |
8763 | often. | |
8764 | Defaults to @samp{64000}. | |
8765 | @end deftypevr | |
8766 | ||
8767 | @deftypevr {@code{dovecot-configuration} parameter} string imap-logout-format | |
8768 | IMAP logout format string: | |
8769 | @table @code | |
8770 | @item %i | |
8771 | total number of bytes read from client | |
8772 | @item %o | |
8773 | total number of bytes sent to client. | |
8774 | @end table | |
8775 | Defaults to @samp{"in=%i out=%o"}. | |
8776 | @end deftypevr | |
8777 | ||
8778 | @deftypevr {@code{dovecot-configuration} parameter} string imap-capability | |
8779 | Override the IMAP CAPABILITY response. If the value begins with '+', | |
8780 | add the given capabilities on top of the defaults (e.g. +XFOO XBAR). | |
8781 | Defaults to @samp{""}. | |
8782 | @end deftypevr | |
8783 | ||
8784 | @deftypevr {@code{dovecot-configuration} parameter} string imap-idle-notify-interval | |
8785 | How long to wait between "OK Still here" notifications when client | |
8786 | is IDLEing. | |
8787 | Defaults to @samp{"2 mins"}. | |
8788 | @end deftypevr | |
8789 | ||
8790 | @deftypevr {@code{dovecot-configuration} parameter} string imap-id-send | |
8791 | ID field names and values to send to clients. Using * as the value | |
8792 | makes Dovecot use the default value. The following fields have default | |
8793 | values currently: name, version, os, os-version, support-url, | |
8794 | support-email. | |
8795 | Defaults to @samp{""}. | |
8796 | @end deftypevr | |
8797 | ||
8798 | @deftypevr {@code{dovecot-configuration} parameter} string imap-id-log | |
8799 | ID fields sent by client to log. * means everything. | |
8800 | Defaults to @samp{""}. | |
8801 | @end deftypevr | |
8802 | ||
8803 | @deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list imap-client-workarounds | |
8804 | Workarounds for various client bugs: | |
8805 | ||
8806 | @table @code | |
8807 | @item delay-newmail | |
8808 | Send EXISTS/RECENT new mail notifications only when replying to NOOP and | |
8809 | CHECK commands. Some clients ignore them otherwise, for example OSX | |
8810 | Mail (<v2.1). Outlook Express breaks more badly though, without this it | |
8811 | may show user "Message no longer in server" errors. Note that OE6 | |
8812 | still breaks even with this workaround if synchronization is set to | |
8813 | "Headers Only". | |
8814 | ||
8815 | @item tb-extra-mailbox-sep | |
8816 | Thunderbird gets somehow confused with LAYOUT=fs (mbox and dbox) and | |
8817 | adds extra @samp{/} suffixes to mailbox names. This option causes Dovecot to | |
8818 | ignore the extra @samp{/} instead of treating it as invalid mailbox name. | |
8819 | ||
8820 | @item tb-lsub-flags | |
8821 | Show \Noselect flags for LSUB replies with LAYOUT=fs (e.g. mbox). | |
8822 | This makes Thunderbird realize they aren't selectable and show them | |
8823 | greyed out, instead of only later giving "not selectable" popup error. | |
8824 | @end table | |
8825 | Defaults to @samp{()}. | |
8826 | @end deftypevr | |
8827 | ||
8828 | @deftypevr {@code{dovecot-configuration} parameter} string imap-urlauth-host | |
8829 | Host allowed in URLAUTH URLs sent by client. "*" allows all. | |
8830 | Defaults to @samp{""}. | |
8831 | @end deftypevr | |
8832 | ||
8833 | ||
8834 | Whew! Lots of configuration options. The nice thing about it though is | |
8835 | that GuixSD has a complete interface to Dovecot's configuration | |
8836 | language. This allows not only a nice way to declare configurations, | |
8837 | but also offers reflective capabilities as well: users can write code to | |
8838 | inspect and transform configurations from within Scheme. | |
8839 | ||
8840 | However, it could be that you just want to get a @code{dovecot.conf} up | |
8841 | and running. In that case, you can pass an | |
8842 | @code{opaque-dovecot-configuration} as the @code{#:config} paramter to | |
8843 | @code{dovecot-service}. As its name indicates, an opaque configuration | |
8844 | does not have easy reflective capabilities. | |
8845 | ||
8846 | Available @code{opaque-dovecot-configuration} fields are: | |
8847 | ||
8848 | @deftypevr {@code{opaque-dovecot-configuration} parameter} package dovecot | |
8849 | The dovecot package. | |
8850 | @end deftypevr | |
8851 | ||
8852 | @deftypevr {@code{opaque-dovecot-configuration} parameter} string string | |
8853 | The contents of the @code{dovecot.conf}, as a string. | |
8854 | @end deftypevr | |
8855 | ||
8856 | For example, if your @code{dovecot.conf} is just the empty string, you | |
8857 | could instantiate a dovecot service like this: | |
8858 | ||
8859 | @example | |
8860 | (dovecot-service #:config | |
8861 | (opaque-dovecot-configuration | |
8862 | (string ""))) | |
8863 | @end example | |
8864 | ||
58724c48 DT |
8865 | @node Web Services |
8866 | @subsubsection Web Services | |
8867 | ||
8868 | The @code{(gnu services web)} module provides the following service: | |
8869 | ||
be1c2c54 | 8870 | @deffn {Scheme Procedure} nginx-service [#:nginx nginx] @ |
58724c48 DT |
8871 | [#:log-directory ``/var/log/nginx''] @ |
8872 | [#:run-directory ``/var/run/nginx''] @ | |
8873 | [#:config-file] | |
8874 | ||
8875 | Return a service that runs @var{nginx}, the nginx web server. | |
8876 | ||
8877 | The nginx daemon loads its runtime configuration from @var{config-file}. | |
8878 | Log files are written to @var{log-directory} and temporary runtime data | |
8879 | files are written to @var{run-directory}. For proper operation, these | |
8880 | arguments should match what is in @var{config-file} to ensure that the | |
8881 | directories are created when the service is activated. | |
8882 | ||
8883 | @end deffn | |
8884 | ||
fe1a39d3 LC |
8885 | @node Various Services |
8886 | @subsubsection Various Services | |
8887 | ||
8888 | The @code{(gnu services lirc)} module provides the following service. | |
8889 | ||
be1c2c54 | 8890 | @deffn {Scheme Procedure} lirc-service [#:lirc lirc] @ |
fe1a39d3 LC |
8891 | [#:device #f] [#:driver #f] [#:config-file #f] @ |
8892 | [#:extra-options '()] | |
8893 | Return a service that runs @url{http://www.lirc.org,LIRC}, a daemon that | |
8894 | decodes infrared signals from remote controls. | |
8895 | ||
8896 | Optionally, @var{device}, @var{driver} and @var{config-file} | |
8897 | (configuration file name) may be specified. See @command{lircd} manual | |
8898 | for details. | |
8899 | ||
8900 | Finally, @var{extra-options} is a list of additional command-line options | |
8901 | passed to @command{lircd}. | |
8902 | @end deffn | |
8903 | ||
8904 | ||
0ae8c15a LC |
8905 | @node Setuid Programs |
8906 | @subsection Setuid Programs | |
8907 | ||
8908 | @cindex setuid programs | |
8909 | Some programs need to run with ``root'' privileges, even when they are | |
8910 | launched by unprivileged users. A notorious example is the | |
4d40227c LC |
8911 | @command{passwd} program, which users can run to change their |
8912 | password, and which needs to access the @file{/etc/passwd} and | |
0ae8c15a LC |
8913 | @file{/etc/shadow} files---something normally restricted to root, for |
8914 | obvious security reasons. To address that, these executables are | |
8915 | @dfn{setuid-root}, meaning that they always run with root privileges | |
8916 | (@pxref{How Change Persona,,, libc, The GNU C Library Reference Manual}, | |
f7e4ae7f | 8917 | for more info about the setuid mechanism.) |
0ae8c15a LC |
8918 | |
8919 | The store itself @emph{cannot} contain setuid programs: that would be a | |
8920 | security issue since any user on the system can write derivations that | |
8921 | populate the store (@pxref{The Store}). Thus, a different mechanism is | |
8922 | used: instead of changing the setuid bit directly on files that are in | |
8923 | the store, we let the system administrator @emph{declare} which programs | |
8924 | should be setuid root. | |
8925 | ||
8926 | The @code{setuid-programs} field of an @code{operating-system} | |
8927 | declaration contains a list of G-expressions denoting the names of | |
8928 | programs to be setuid-root (@pxref{Using the Configuration System}). | |
8929 | For instance, the @command{passwd} program, which is part of the Shadow | |
8930 | package, can be designated by this G-expression (@pxref{G-Expressions}): | |
8931 | ||
8932 | @example | |
8933 | #~(string-append #$shadow "/bin/passwd") | |
8934 | @end example | |
8935 | ||
8936 | A default set of setuid programs is defined by the | |
8937 | @code{%setuid-programs} variable of the @code{(gnu system)} module. | |
8938 | ||
8939 | @defvr {Scheme Variable} %setuid-programs | |
8940 | A list of G-expressions denoting common programs that are setuid-root. | |
8941 | ||
8942 | The list includes commands such as @command{passwd}, @command{ping}, | |
8943 | @command{su}, and @command{sudo}. | |
8944 | @end defvr | |
8945 | ||
8946 | Under the hood, the actual setuid programs are created in the | |
8947 | @file{/run/setuid-programs} directory at system activation time. The | |
8948 | files in this directory refer to the ``real'' binaries, which are in the | |
8949 | store. | |
8950 | ||
efb5e833 LC |
8951 | @node X.509 Certificates |
8952 | @subsection X.509 Certificates | |
8953 | ||
8954 | @cindex HTTPS, certificates | |
8955 | @cindex X.509 certificates | |
8956 | @cindex TLS | |
8957 | Web servers available over HTTPS (that is, HTTP over the transport-layer | |
8958 | security mechanism, TLS) send client programs an @dfn{X.509 certificate} | |
8959 | that the client can then use to @emph{authenticate} the server. To do | |
8960 | that, clients verify that the server's certificate is signed by a | |
8961 | so-called @dfn{certificate authority} (CA). But to verify the CA's | |
8962 | signature, clients must have first acquired the CA's certificate. | |
8963 | ||
8964 | Web browsers such as GNU@tie{}IceCat include their own set of CA | |
8965 | certificates, such that they are able to verify CA signatures | |
8966 | out-of-the-box. | |
8967 | ||
8968 | However, most other programs that can talk HTTPS---@command{wget}, | |
8969 | @command{git}, @command{w3m}, etc.---need to be told where CA | |
8970 | certificates can be found. | |
8971 | ||
8972 | @cindex @code{nss-certs} | |
8973 | In GuixSD, this is done by adding a package that provides certificates | |
8974 | to the @code{packages} field of the @code{operating-system} declaration | |
8975 | (@pxref{operating-system Reference}). GuixSD includes one such package, | |
8976 | @code{nss-certs}, which is a set of CA certificates provided as part of | |
8977 | Mozilla's Network Security Services. | |
8978 | ||
8979 | Note that it is @emph{not} part of @var{%base-packages}, so you need to | |
8980 | explicitly add it. The @file{/etc/ssl/certs} directory, which is where | |
8981 | most applications and libraries look for certificates by default, points | |
8982 | to the certificates installed globally. | |
8983 | ||
8984 | Unprivileged users can also install their own certificate package in | |
8985 | their profile. A number of environment variables need to be defined so | |
8986 | that applications and libraries know where to find them. Namely, the | |
8987 | OpenSSL library honors the @code{SSL_CERT_DIR} and @code{SSL_CERT_FILE} | |
8988 | variables. Some applications add their own environment variables; for | |
8989 | instance, the Git version control system honors the certificate bundle | |
8990 | pointed to by the @code{GIT_SSL_CAINFO} environment variable. | |
8991 | ||
8992 | ||
996ed739 LC |
8993 | @node Name Service Switch |
8994 | @subsection Name Service Switch | |
8995 | ||
8996 | @cindex name service switch | |
8997 | @cindex NSS | |
8998 | The @code{(gnu system nss)} module provides bindings to the | |
8999 | configuration file of libc's @dfn{name service switch} or @dfn{NSS} | |
9000 | (@pxref{NSS Configuration File,,, libc, The GNU C Library Reference | |
9001 | Manual}). In a nutshell, the NSS is a mechanism that allows libc to be | |
9002 | extended with new ``name'' lookup methods for system databases, which | |
9003 | includes host names, service names, user accounts, and more (@pxref{Name | |
9004 | Service Switch, System Databases and Name Service Switch,, libc, The GNU | |
9005 | C Library Reference Manual}). | |
9006 | ||
9007 | The NSS configuration specifies, for each system database, which lookup | |
9008 | method is to be used, and how the various methods are chained | |
9009 | together---for instance, under which circumstances NSS should try the | |
9010 | next method in the list. The NSS configuration is given in the | |
9011 | @code{name-service-switch} field of @code{operating-system} declarations | |
9012 | (@pxref{operating-system Reference, @code{name-service-switch}}). | |
9013 | ||
4c9050c6 LC |
9014 | @cindex nss-mdns |
9015 | @cindex .local, host name lookup | |
996ed739 | 9016 | As an example, the declaration below configures the NSS to use the |
4c9050c6 LC |
9017 | @uref{http://0pointer.de/lennart/projects/nss-mdns/, @code{nss-mdns} |
9018 | back-end}, which supports host name lookups over multicast DNS (mDNS) | |
9019 | for host names ending in @code{.local}: | |
996ed739 LC |
9020 | |
9021 | @example | |
9022 | (name-service-switch | |
9023 | (hosts (list %files ;first, check /etc/hosts | |
9024 | ||
9025 | ;; If the above did not succeed, try | |
9026 | ;; with 'mdns_minimal'. | |
9027 | (name-service | |
9028 | (name "mdns_minimal") | |
9029 | ||
9030 | ;; 'mdns_minimal' is authoritative for | |
9031 | ;; '.local'. When it returns "not found", | |
9032 | ;; no need to try the next methods. | |
9033 | (reaction (lookup-specification | |
9034 | (not-found => return)))) | |
9035 | ||
9036 | ;; Then fall back to DNS. | |
9037 | (name-service | |
9038 | (name "dns")) | |
9039 | ||
9040 | ;; Finally, try with the "full" 'mdns'. | |
9041 | (name-service | |
9042 | (name "mdns"))))) | |
9043 | @end example | |
9044 | ||
15137a29 LC |
9045 | Don't worry: the @code{%mdns-host-lookup-nss} variable (see below) |
9046 | contains this configuration, so you won't have to type it if all you | |
9047 | want is to have @code{.local} host lookup working. | |
9048 | ||
4c9050c6 LC |
9049 | Note that, in this case, in addition to setting the |
9050 | @code{name-service-switch} of the @code{operating-system} declaration, | |
cc9c1f39 LC |
9051 | you also need to use @code{avahi-service} (@pxref{Networking Services, |
9052 | @code{avahi-service}}), or @var{%desktop-services}, which includes it | |
9053 | (@pxref{Desktop Services}). Doing this makes @code{nss-mdns} accessible | |
9054 | to the name service cache daemon (@pxref{Base Services, | |
9055 | @code{nscd-service}}). | |
15137a29 LC |
9056 | |
9057 | For convenience, the following variables provide typical NSS | |
9058 | configurations. | |
9059 | ||
9060 | @defvr {Scheme Variable} %default-nss | |
9061 | This is the default name service switch configuration, a | |
9062 | @code{name-service-switch} object. | |
9063 | @end defvr | |
9064 | ||
9065 | @defvr {Scheme Variable} %mdns-host-lookup-nss | |
9066 | This is the name service switch configuration with support for host name | |
9067 | lookup over multicast DNS (mDNS) for host names ending in @code{.local}. | |
9068 | @end defvr | |
4c9050c6 | 9069 | |
996ed739 LC |
9070 | The reference for name service switch configuration is given below. It |
9071 | is a direct mapping of the C library's configuration file format, so | |
9072 | please refer to the C library manual for more information (@pxref{NSS | |
9073 | Configuration File,,, libc, The GNU C Library Reference Manual}). | |
9074 | Compared to libc's NSS configuration file format, it has the advantage | |
9075 | not only of adding this warm parenthetic feel that we like, but also | |
9076 | static checks: you'll know about syntax errors and typos as soon as you | |
9077 | run @command{guix system}. | |
9078 | ||
996ed739 LC |
9079 | @deftp {Data Type} name-service-switch |
9080 | ||
9081 | This is the data type representation the configuration of libc's name | |
9082 | service switch (NSS). Each field below represents one of the supported | |
9083 | system databases. | |
9084 | ||
9085 | @table @code | |
9086 | @item aliases | |
9087 | @itemx ethers | |
9088 | @itemx group | |
9089 | @itemx gshadow | |
9090 | @itemx hosts | |
9091 | @itemx initgroups | |
9092 | @itemx netgroup | |
9093 | @itemx networks | |
9094 | @itemx password | |
9095 | @itemx public-key | |
9096 | @itemx rpc | |
9097 | @itemx services | |
9098 | @itemx shadow | |
9099 | The system databases handled by the NSS. Each of these fields must be a | |
9100 | list of @code{<name-service>} objects (see below.) | |
9101 | @end table | |
9102 | @end deftp | |
9103 | ||
9104 | @deftp {Data Type} name-service | |
9105 | ||
9106 | This is the data type representing an actual name service and the | |
9107 | associated lookup action. | |
9108 | ||
9109 | @table @code | |
9110 | @item name | |
9111 | A string denoting the name service (@pxref{Services in the NSS | |
9112 | configuration,,, libc, The GNU C Library Reference Manual}). | |
9113 | ||
4aee6e60 LC |
9114 | Note that name services listed here must be visible to nscd. This is |
9115 | achieved by passing the @code{#:name-services} argument to | |
9116 | @code{nscd-service} the list of packages providing the needed name | |
9117 | services (@pxref{Base Services, @code{nscd-service}}). | |
9118 | ||
996ed739 LC |
9119 | @item reaction |
9120 | An action specified using the @code{lookup-specification} macro | |
9121 | (@pxref{Actions in the NSS configuration,,, libc, The GNU C Library | |
9122 | Reference Manual}). For example: | |
9123 | ||
9124 | @example | |
9125 | (lookup-specification (unavailable => continue) | |
9126 | (success => return)) | |
9127 | @end example | |
9128 | @end table | |
9129 | @end deftp | |
0ae8c15a | 9130 | |
fd1b1fa2 LC |
9131 | @node Initial RAM Disk |
9132 | @subsection Initial RAM Disk | |
9133 | ||
9134 | @cindex initial RAM disk (initrd) | |
9135 | @cindex initrd (initial RAM disk) | |
9136 | For bootstrapping purposes, the Linux-Libre kernel is passed an | |
9137 | @dfn{initial RAM disk}, or @dfn{initrd}. An initrd contains a temporary | |
9138 | root file system, as well as an initialization script. The latter is | |
9139 | responsible for mounting the real root file system, and for loading any | |
9140 | kernel modules that may be needed to achieve that. | |
9141 | ||
9142 | The @code{initrd} field of an @code{operating-system} declaration allows | |
9143 | you to specify which initrd you would like to use. The @code{(gnu | |
9144 | system linux-initrd)} module provides two ways to build an initrd: the | |
9145 | high-level @code{base-initrd} procedure, and the low-level | |
9146 | @code{expression->initrd} procedure. | |
9147 | ||
9148 | The @code{base-initrd} procedure is intended to cover most common uses. | |
9149 | For example, if you want to add a bunch of kernel modules to be loaded | |
9150 | at boot time, you can define the @code{initrd} field of the operating | |
9151 | system declaration like this: | |
9152 | ||
9153 | @example | |
52ac153e | 9154 | (initrd (lambda (file-systems . rest) |
027981d6 LC |
9155 | ;; Create a standard initrd that has modules "foo.ko" |
9156 | ;; and "bar.ko", as well as their dependencies, in | |
9157 | ;; addition to the modules available by default. | |
52ac153e | 9158 | (apply base-initrd file-systems |
027981d6 | 9159 | #:extra-modules '("foo" "bar") |
52ac153e | 9160 | rest))) |
fd1b1fa2 LC |
9161 | @end example |
9162 | ||
52ac153e LC |
9163 | The @code{base-initrd} procedure also handles common use cases that |
9164 | involves using the system as a QEMU guest, or as a ``live'' system whose | |
9165 | root file system is volatile. | |
fd1b1fa2 | 9166 | |
e90cf6c1 LC |
9167 | The initial RAM disk produced by @code{base-initrd} honors several |
9168 | options passed on the Linux kernel command line (that is, arguments | |
9169 | passed @i{via} GRUB's @code{linux} command, or with QEMU's | |
9170 | @code{-append} option), notably: | |
9171 | ||
9172 | @table @code | |
9173 | @item --load=@var{boot} | |
9174 | Tell the initial RAM disk to load @var{boot}, a file containing a Scheme | |
9175 | program, once it has mounted the root file system. | |
9176 | ||
9177 | GuixSD uses this option to yield control to a boot program that runs the | |
dd17bc38 | 9178 | service activation programs and then spawns the GNU@tie{}Shepherd, the |
e90cf6c1 LC |
9179 | initialization system. |
9180 | ||
9181 | @item --root=@var{root} | |
9182 | Mount @var{root} as the root file system. @var{root} can be a device | |
9183 | device name like @code{/dev/sda1}, a partition label, or a partition | |
9184 | UUID. | |
9185 | ||
9186 | @item --system=@var{system} | |
9187 | Have @file{/run/booted-system} and @file{/run/current-system} point to | |
9188 | @var{system}. | |
9189 | ||
9190 | @item modprobe.blacklist=@var{modules}@dots{} | |
9191 | @cindex module, black-listing | |
9192 | @cindex black list, of kernel modules | |
9193 | Instruct the initial RAM disk as well as the @command{modprobe} command | |
9194 | (from the kmod package) to refuse to load @var{modules}. @var{modules} | |
9195 | must be a comma-separated list of module names---e.g., | |
9196 | @code{usbkbd,9pnet}. | |
9197 | ||
9198 | @item --repl | |
9199 | Start a read-eval-print loop (REPL) from the initial RAM disk before it | |
9200 | tries to load kernel modules and to mount the root file system. Our | |
9201 | marketing team calls it @dfn{boot-to-Guile}. The Schemer in you will | |
9202 | love it. @xref{Using Guile Interactively,,, guile, GNU Guile Reference | |
9203 | Manual}, for more information on Guile's REPL. | |
9204 | ||
9205 | @end table | |
9206 | ||
9207 | Now that you know all the features that initial RAM disks produced by | |
9208 | @code{base-initrd} provide, here is how to use it and customize it | |
9209 | further. | |
9210 | ||
fd1b1fa2 | 9211 | @deffn {Monadic Procedure} base-initrd @var{file-systems} @ |
9059b97d | 9212 | [#:qemu-networking? #f] [#:virtio? #t] [#:volatile-root? #f] @ |
52ac153e | 9213 | [#:extra-modules '()] [#:mapped-devices '()] |
fd1b1fa2 LC |
9214 | Return a monadic derivation that builds a generic initrd. @var{file-systems} is |
9215 | a list of file-systems to be mounted by the initrd, possibly in addition to | |
9216 | the root file system specified on the kernel command line via @code{--root}. | |
52ac153e LC |
9217 | @var{mapped-devices} is a list of device mappings to realize before |
9218 | @var{file-systems} are mounted (@pxref{Mapped Devices}). | |
fd1b1fa2 LC |
9219 | |
9220 | When @var{qemu-networking?} is true, set up networking with the standard QEMU | |
9221 | parameters. When @var{virtio?} is true, load additional modules so the initrd can | |
9222 | be used as a QEMU guest with para-virtualized I/O drivers. | |
9223 | ||
9224 | When @var{volatile-root?} is true, the root file system is writable but any changes | |
9225 | to it are lost. | |
9226 | ||
9227 | The initrd is automatically populated with all the kernel modules necessary | |
9228 | for @var{file-systems} and for the given options. However, additional kernel | |
9229 | modules can be listed in @var{extra-modules}. They will be added to the initrd, and | |
9230 | loaded at boot time in the order in which they appear. | |
9231 | @end deffn | |
9232 | ||
9233 | Needless to say, the initrds we produce and use embed a | |
9234 | statically-linked Guile, and the initialization program is a Guile | |
9235 | program. That gives a lot of flexibility. The | |
9236 | @code{expression->initrd} procedure builds such an initrd, given the | |
9237 | program to run in that initrd. | |
9238 | ||
9239 | @deffn {Monadic Procedure} expression->initrd @var{exp} @ | |
9240 | [#:guile %guile-static-stripped] [#:name "guile-initrd"] @ | |
42d10464 | 9241 | [#:modules '()] |
fd1b1fa2 LC |
9242 | Return a derivation that builds a Linux initrd (a gzipped cpio archive) |
9243 | containing @var{guile} and that evaluates @var{exp}, a G-expression, | |
df650fa8 LC |
9244 | upon booting. All the derivations referenced by @var{exp} are |
9245 | automatically copied to the initrd. | |
fd1b1fa2 | 9246 | |
42d10464 LC |
9247 | @var{modules} is a list of Guile module names to be embedded in the |
9248 | initrd. | |
fd1b1fa2 LC |
9249 | @end deffn |
9250 | ||
88faf933 LC |
9251 | @node GRUB Configuration |
9252 | @subsection GRUB Configuration | |
9253 | ||
9254 | @cindex GRUB | |
9255 | @cindex boot loader | |
9256 | ||
9257 | The operating system uses GNU@tie{}GRUB as its boot loader | |
9258 | (@pxref{Overview, overview of GRUB,, grub, GNU GRUB Manual}). It is | |
9259 | configured using @code{grub-configuration} declarations. This data type | |
9260 | is exported by the @code{(gnu system grub)} module, and described below. | |
9261 | ||
9262 | @deftp {Data Type} grub-configuration | |
9263 | The type of a GRUB configuration declaration. | |
9264 | ||
9265 | @table @asis | |
9266 | ||
9267 | @item @code{device} | |
9268 | This is a string denoting the boot device. It must be a device name | |
9269 | understood by the @command{grub-install} command, such as | |
9270 | @code{/dev/sda} or @code{(hd0)} (@pxref{Invoking grub-install,,, grub, | |
9271 | GNU GRUB Manual}). | |
9272 | ||
9273 | @item @code{menu-entries} (default: @code{()}) | |
9274 | A possibly empty list of @code{menu-entry} objects (see below), denoting | |
9275 | entries to appear in the GRUB boot menu, in addition to the current | |
9276 | system entry and the entry pointing to previous system generations. | |
9277 | ||
9278 | @item @code{default-entry} (default: @code{0}) | |
9279 | The index of the default boot menu entry. Index 0 is for the current | |
9280 | system's entry. | |
9281 | ||
9282 | @item @code{timeout} (default: @code{5}) | |
9283 | The number of seconds to wait for keyboard input before booting. Set to | |
9284 | 0 to boot immediately, and to -1 to wait indefinitely. | |
9285 | ||
9286 | @item @code{theme} (default: @var{%default-theme}) | |
9287 | The @code{grub-theme} object describing the theme to use. | |
9288 | @end table | |
9289 | ||
9290 | @end deftp | |
9291 | ||
9292 | Should you want to list additional boot menu entries @i{via} the | |
9293 | @code{menu-entries} field above, you will need to create them with the | |
9294 | @code{menu-entry} form: | |
9295 | ||
9296 | @deftp {Data Type} menu-entry | |
9297 | The type of an entry in the GRUB boot menu. | |
9298 | ||
9299 | @table @asis | |
9300 | ||
9301 | @item @code{label} | |
35ed9306 | 9302 | The label to show in the menu---e.g., @code{"GNU"}. |
88faf933 LC |
9303 | |
9304 | @item @code{linux} | |
9305 | The Linux kernel to boot. | |
9306 | ||
9307 | @item @code{linux-arguments} (default: @code{()}) | |
9308 | The list of extra Linux kernel command-line arguments---e.g., | |
9309 | @code{("console=ttyS0")}. | |
9310 | ||
9311 | @item @code{initrd} | |
9312 | A G-Expression or string denoting the file name of the initial RAM disk | |
9313 | to use (@pxref{G-Expressions}). | |
9314 | ||
9315 | @end table | |
9316 | @end deftp | |
9317 | ||
9318 | @c FIXME: Write documentation once it's stable. | |
9319 | Themes are created using the @code{grub-theme} form, which is not | |
9320 | documented yet. | |
9321 | ||
9322 | @defvr {Scheme Variable} %default-theme | |
9323 | This is the default GRUB theme used by the operating system, with a | |
9324 | fancy background image displaying the GNU and Guix logos. | |
9325 | @end defvr | |
9326 | ||
9327 | ||
cf4a9129 LC |
9328 | @node Invoking guix system |
9329 | @subsection Invoking @code{guix system} | |
0918e64a | 9330 | |
cf4a9129 LC |
9331 | Once you have written an operating system declaration, as seen in the |
9332 | previous section, it can be @dfn{instantiated} using the @command{guix | |
9333 | system} command. The synopsis is: | |
4af2447e | 9334 | |
cf4a9129 LC |
9335 | @example |
9336 | guix system @var{options}@dots{} @var{action} @var{file} | |
9337 | @end example | |
4af2447e | 9338 | |
cf4a9129 LC |
9339 | @var{file} must be the name of a file containing an |
9340 | @code{operating-system} declaration. @var{action} specifies how the | |
9341 | operating system is instantiate. Currently the following values are | |
9342 | supported: | |
4af2447e | 9343 | |
cf4a9129 LC |
9344 | @table @code |
9345 | @item reconfigure | |
9346 | Build the operating system described in @var{file}, activate it, and | |
9347 | switch to it@footnote{This action is usable only on systems already | |
65797bff | 9348 | running GuixSD.}. |
4af2447e | 9349 | |
cf4a9129 LC |
9350 | This effects all the configuration specified in @var{file}: user |
9351 | accounts, system services, global package list, setuid programs, etc. | |
240b57f0 LC |
9352 | The command starts system services specified in @var{file} that are not |
9353 | currently running; if a service is currently running, it does not | |
9354 | attempt to upgrade it since it would not be possible without stopping it | |
9355 | first. | |
4af2447e | 9356 | |
cf4a9129 LC |
9357 | It also adds a GRUB menu entry for the new OS configuration, and moves |
9358 | entries for older configurations to a submenu---unless | |
9359 | @option{--no-grub} is passed. | |
4af2447e | 9360 | |
240b57f0 | 9361 | @quotation Note |
bf2479c7 LC |
9362 | @c The paragraph below refers to the problem discussed at |
9363 | @c <http://lists.gnu.org/archive/html/guix-devel/2014-08/msg00057.html>. | |
9364 | It is highly recommended to run @command{guix pull} once before you run | |
9365 | @command{guix system reconfigure} for the first time (@pxref{Invoking | |
9366 | guix pull}). Failing to do that you would see an older version of Guix | |
9367 | once @command{reconfigure} has completed. | |
240b57f0 | 9368 | @end quotation |
bf2479c7 | 9369 | |
cf4a9129 LC |
9370 | @item build |
9371 | Build the operating system's derivation, which includes all the | |
9372 | configuration files and programs needed to boot and run the system. | |
9373 | This action does not actually install anything. | |
113daf62 | 9374 | |
cf4a9129 LC |
9375 | @item init |
9376 | Populate the given directory with all the files necessary to run the | |
9377 | operating system specified in @var{file}. This is useful for first-time | |
4705641f | 9378 | installations of GuixSD. For instance: |
113daf62 LC |
9379 | |
9380 | @example | |
cf4a9129 | 9381 | guix system init my-os-config.scm /mnt |
113daf62 LC |
9382 | @end example |
9383 | ||
cf4a9129 LC |
9384 | copies to @file{/mnt} all the store items required by the configuration |
9385 | specified in @file{my-os-config.scm}. This includes configuration | |
9386 | files, packages, and so on. It also creates other essential files | |
9387 | needed for the system to operate correctly---e.g., the @file{/etc}, | |
9388 | @file{/var}, and @file{/run} directories, and the @file{/bin/sh} file. | |
113daf62 | 9389 | |
cf4a9129 LC |
9390 | This command also installs GRUB on the device specified in |
9391 | @file{my-os-config}, unless the @option{--no-grub} option was passed. | |
113daf62 | 9392 | |
cf4a9129 LC |
9393 | @item vm |
9394 | @cindex virtual machine | |
0276f697 | 9395 | @cindex VM |
f535dcbe | 9396 | @anchor{guix system vm} |
cf4a9129 LC |
9397 | Build a virtual machine that contain the operating system declared in |
9398 | @var{file}, and return a script to run that virtual machine (VM). | |
810568b3 | 9399 | Arguments given to the script are passed as is to QEMU. |
113daf62 | 9400 | |
cf4a9129 | 9401 | The VM shares its store with the host system. |
113daf62 | 9402 | |
0276f697 LC |
9403 | Additional file systems can be shared between the host and the VM using |
9404 | the @code{--share} and @code{--expose} command-line options: the former | |
9405 | specifies a directory to be shared with write access, while the latter | |
9406 | provides read-only access to the shared directory. | |
9407 | ||
9408 | The example below creates a VM in which the user's home directory is | |
9409 | accessible read-only, and where the @file{/exchange} directory is a | |
9410 | read-write mapping of the host's @file{$HOME/tmp}: | |
9411 | ||
9412 | @example | |
9413 | guix system vm my-config.scm \ | |
9414 | --expose=$HOME --share=$HOME/tmp=/exchange | |
9415 | @end example | |
9416 | ||
6aa260af LC |
9417 | On GNU/Linux, the default is to boot directly to the kernel; this has |
9418 | the advantage of requiring only a very tiny root disk image since the | |
9419 | host's store can then be mounted. | |
9420 | ||
9421 | The @code{--full-boot} option forces a complete boot sequence, starting | |
9422 | with the bootloader. This requires more disk space since a root image | |
9423 | containing at least the kernel, initrd, and bootloader data files must | |
9424 | be created. The @code{--image-size} option can be used to specify the | |
9425 | image's size. | |
ab11f0be | 9426 | |
cf4a9129 LC |
9427 | @item vm-image |
9428 | @itemx disk-image | |
9429 | Return a virtual machine or disk image of the operating system declared | |
9430 | in @var{file} that stands alone. Use the @option{--image-size} option | |
9431 | to specify the size of the image. | |
113daf62 | 9432 | |
cf4a9129 | 9433 | When using @code{vm-image}, the returned image is in qcow2 format, which |
97d76250 LF |
9434 | the QEMU emulator can efficiently use. @xref{Running GuixSD in a VM}, |
9435 | for more information on how to run the image in a virtual machine. | |
113daf62 | 9436 | |
cf4a9129 LC |
9437 | When using @code{disk-image}, a raw disk image is produced; it can be |
9438 | copied as is to a USB stick, for instance. Assuming @code{/dev/sdc} is | |
9439 | the device corresponding to a USB stick, one can copy the image on it | |
9440 | using the following command: | |
113daf62 | 9441 | |
cf4a9129 LC |
9442 | @example |
9443 | # dd if=$(guix system disk-image my-os.scm) of=/dev/sdc | |
9444 | @end example | |
113daf62 | 9445 | |
1c8a81b1 DT |
9446 | @item container |
9447 | Return a script to run the operating system declared in @var{file} | |
9448 | within a container. Containers are a set of lightweight isolation | |
9449 | mechanisms provided by the kernel Linux-libre. Containers are | |
9450 | substantially less resource-demanding than full virtual machines since | |
9451 | the kernel, shared objects, and other resources can be shared with the | |
9452 | host system; this also means they provide thinner isolation. | |
9453 | ||
9454 | Currently, the script must be run as root in order to support more than | |
9455 | a single user and group. The container shares its store with the host | |
9456 | system. | |
9457 | ||
9458 | As with the @code{vm} action (@pxref{guix system vm}), additional file | |
9459 | systems to be shared between the host and container can be specified | |
9460 | using the @option{--share} and @option{--expose} options: | |
9461 | ||
9462 | @example | |
9463 | guix system container my-config.scm \ | |
9464 | --expose=$HOME --share=$HOME/tmp=/exchange | |
9465 | @end example | |
9466 | ||
0f252e26 | 9467 | @quotation Note |
cfd35b4e | 9468 | This option requires Linux-libre 3.19 or newer. |
0f252e26 DT |
9469 | @end quotation |
9470 | ||
cf4a9129 | 9471 | @end table |
113daf62 | 9472 | |
ccd7158d LC |
9473 | @var{options} can contain any of the common build options (@pxref{Common |
9474 | Build Options}). In addition, @var{options} can contain one of the | |
9475 | following: | |
113daf62 | 9476 | |
cf4a9129 LC |
9477 | @table @option |
9478 | @item --system=@var{system} | |
9479 | @itemx -s @var{system} | |
9480 | Attempt to build for @var{system} instead of the host's system type. | |
9481 | This works as per @command{guix build} (@pxref{Invoking guix build}). | |
113daf62 | 9482 | |
f3f427c2 LC |
9483 | @item --derivation |
9484 | @itemx -d | |
9485 | Return the derivation file name of the given operating system without | |
9486 | building anything. | |
9487 | ||
cf4a9129 LC |
9488 | @item --image-size=@var{size} |
9489 | For the @code{vm-image} and @code{disk-image} actions, create an image | |
9490 | of the given @var{size}. @var{size} may be a number of bytes, or it may | |
4a44d7bb LC |
9491 | include a unit as a suffix (@pxref{Block size, size specifications,, |
9492 | coreutils, GNU Coreutils}). | |
db030303 LC |
9493 | |
9494 | @item --on-error=@var{strategy} | |
9495 | Apply @var{strategy} when an error occurs when reading @var{file}. | |
9496 | @var{strategy} may be one of the following: | |
9497 | ||
9498 | @table @code | |
9499 | @item nothing-special | |
9500 | Report the error concisely and exit. This is the default strategy. | |
9501 | ||
9502 | @item backtrace | |
9503 | Likewise, but also display a backtrace. | |
9504 | ||
9505 | @item debug | |
9506 | Report the error and enter Guile's debugger. From there, you can run | |
9507 | commands such as @code{,bt} to get a backtrace, @code{,locals} to | |
9508 | display local variable values, and more generally inspect the program's | |
9509 | state. @xref{Debug Commands,,, guile, GNU Guile Reference Manual}, for | |
9510 | a list of available debugging commands. | |
9511 | @end table | |
113daf62 | 9512 | @end table |
113daf62 | 9513 | |
cf4a9129 LC |
9514 | Note that all the actions above, except @code{build} and @code{init}, |
9515 | rely on KVM support in the Linux-Libre kernel. Specifically, the | |
9516 | machine should have hardware virtualization support, the corresponding | |
9517 | KVM kernel module should be loaded, and the @file{/dev/kvm} device node | |
9518 | must exist and be readable and writable by the user and by the daemon's | |
9519 | build users. | |
8451a568 | 9520 | |
65797bff LC |
9521 | Once you have built, configured, re-configured, and re-re-configured |
9522 | your GuixSD installation, you may find it useful to list the operating | |
9523 | system generations available on disk---and that you can choose from the | |
9524 | GRUB boot menu: | |
9525 | ||
9526 | @table @code | |
9527 | ||
9528 | @item list-generations | |
9529 | List a summary of each generation of the operating system available on | |
9530 | disk, in a human-readable way. This is similar to the | |
9531 | @option{--list-generations} option of @command{guix package} | |
9532 | (@pxref{Invoking guix package}). | |
9533 | ||
9534 | Optionally, one can specify a pattern, with the same syntax that is used | |
9535 | in @command{guix package --list-generations}, to restrict the list of | |
9536 | generations displayed. For instance, the following command displays | |
9537 | generations up to 10-day old: | |
9538 | ||
9539 | @example | |
9540 | $ guix system list-generations 10d | |
9541 | @end example | |
9542 | ||
9543 | @end table | |
9544 | ||
d6c3267a LC |
9545 | The @command{guix system} command has even more to offer! The following |
9546 | sub-commands allow you to visualize how your system services relate to | |
9547 | each other: | |
9548 | ||
9549 | @anchor{system-extension-graph} | |
9550 | @table @code | |
9551 | ||
9552 | @item extension-graph | |
9553 | Emit in Dot/Graphviz format to standard output the @dfn{service | |
9554 | extension graph} of the operating system defined in @var{file} | |
9555 | (@pxref{Service Composition}, for more information on service | |
9556 | extensions.) | |
9557 | ||
9558 | The command: | |
9559 | ||
9560 | @example | |
9561 | $ guix system extension-graph @var{file} | dot -Tpdf > services.pdf | |
9562 | @end example | |
9563 | ||
9564 | produces a PDF file showing the extension relations among services. | |
9565 | ||
710fa231 AK |
9566 | @anchor{system-shepherd-graph} |
9567 | @item shepherd-graph | |
6f305ea5 | 9568 | Emit in Dot/Graphviz format to standard output the @dfn{dependency |
dd17bc38 AK |
9569 | graph} of shepherd services of the operating system defined in |
9570 | @var{file}. @xref{Shepherd Services}, for more information and for an | |
9571 | example graph. | |
6f305ea5 | 9572 | |
d6c3267a LC |
9573 | @end table |
9574 | ||
97d76250 LF |
9575 | @node Running GuixSD in a VM |
9576 | @subsection Running GuixSD in a virtual machine | |
9577 | ||
9578 | One way to run GuixSD in a virtual machine (VM) is to build a GuixSD | |
9579 | virtual machine image using @command{guix system vm-image} | |
9580 | (@pxref{Invoking guix system}). The returned image is in qcow2 format, | |
9581 | which the @uref{http://qemu.org/, QEMU emulator} can efficiently use. | |
9582 | ||
9583 | To run the image in QEMU, copy it out of the store (@pxref{The Store}) | |
9584 | and give yourself permission to write to the copy. When invoking QEMU, | |
9585 | you must choose a system emulator that is suitable for your hardware | |
9586 | platform. Here is a minimal QEMU invocation that will boot the result | |
9587 | of @command{guix system vm-image} on x86_64 hardware: | |
9588 | ||
9589 | @example | |
9590 | $ qemu-system-x86_64 \ | |
9591 | -net user -net nic,model=virtio \ | |
9592 | -enable-kvm -m 256 /tmp/qemu-image | |
9593 | @end example | |
9594 | ||
9595 | Here is what each of these options means: | |
9596 | ||
9597 | @table @code | |
9598 | @item qemu-system-x86_64 | |
9599 | This specifies the hardware platform to emulate. This should match the | |
9600 | host. | |
9601 | ||
9602 | @item -net user | |
9603 | Enable the unprivileged user-mode network stack. The guest OS can | |
9604 | access the host but not vice versa. This is the simplest way to get the | |
9605 | guest OS online. If you don't choose a network stack, the boot will | |
9606 | fail. | |
9607 | ||
9608 | @item -net nic,model=virtio | |
9609 | You must create a network interface of a given model. If you don't | |
9610 | create a NIC, the boot will fail. Assuming your hardware platform is | |
9611 | x86_64, you can get a list of available NIC models by running | |
9612 | @command{qemu-system-x86_64 -net nic,model=help}. | |
9613 | ||
9614 | @item -enable-kvm | |
9615 | If your system has hardware virtualization extensions, enabling the | |
9616 | Linux kernel's virtual machine support (KVM) will make things run | |
9617 | faster. | |
9618 | ||
9619 | @item -m 256 | |
9620 | RAM available to the guest OS, in mebibytes. Defaults to 128@tie{}MiB, | |
9621 | which may be insufficent for some operations. | |
9622 | ||
9623 | @item /tmp/qemu-image | |
9624 | The file name of the qcow2 image. | |
9625 | @end table | |
d6c3267a | 9626 | |
cf4a9129 LC |
9627 | @node Defining Services |
9628 | @subsection Defining Services | |
8451a568 | 9629 | |
eb524192 | 9630 | The previous sections show the available services and how one can combine |
0adfe95a LC |
9631 | them in an @code{operating-system} declaration. But how do we define |
9632 | them in the first place? And what is a service anyway? | |
8451a568 | 9633 | |
0adfe95a LC |
9634 | @menu |
9635 | * Service Composition:: The model for composing services. | |
9636 | * Service Types and Services:: Types and services. | |
9637 | * Service Reference:: API reference. | |
dd17bc38 | 9638 | * Shepherd Services:: A particular type of service. |
0adfe95a LC |
9639 | @end menu |
9640 | ||
9641 | @node Service Composition | |
9642 | @subsubsection Service Composition | |
9643 | ||
9644 | @cindex services | |
9645 | @cindex daemons | |
9646 | Here we define a @dfn{service} as, broadly, something that extends the | |
9647 | operating system's functionality. Often a service is a process---a | |
9648 | @dfn{daemon}---started when the system boots: a secure shell server, a | |
9649 | Web server, the Guix build daemon, etc. Sometimes a service is a daemon | |
9650 | whose execution can be triggered by another daemon---e.g., an FTP server | |
9651 | started by @command{inetd} or a D-Bus service activated by | |
9652 | @command{dbus-daemon}. Occasionally, a service does not map to a | |
9653 | daemon. For instance, the ``account'' service collects user accounts | |
9654 | and makes sure they exist when the system runs; the ``udev'' service | |
9655 | collects device management rules and makes them available to the eudev | |
9656 | daemon; the @file{/etc} service populates the system's @file{/etc} | |
9657 | directory. | |
9658 | ||
d6c3267a | 9659 | @cindex service extensions |
0adfe95a | 9660 | GuixSD services are connected by @dfn{extensions}. For instance, the |
dd17bc38 AK |
9661 | secure shell service @emph{extends} the Shepherd---GuixSD's |
9662 | initialization system, running as PID@tie{}1---by giving it the command | |
9663 | lines to start and stop the secure shell daemon (@pxref{Networking | |
9664 | Services, @code{lsh-service}}); the UPower service extends the D-Bus | |
9665 | service by passing it its @file{.service} specification, and extends the | |
9666 | udev service by passing it device management rules (@pxref{Desktop | |
9667 | Services, @code{upower-service}}); the Guix daemon service extends the | |
9668 | Shepherd by passing it the command lines to start and stop the daemon, | |
9669 | and extends the account service by passing it a list of required build | |
9670 | user accounts (@pxref{Base Services}). | |
0adfe95a LC |
9671 | |
9672 | All in all, services and their ``extends'' relations form a directed | |
9673 | acyclic graph (DAG). If we represent services as boxes and extensions | |
9674 | as arrows, a typical system might provide something like this: | |
9675 | ||
9676 | @image{images/service-graph,,5in,Typical service extension graph.} | |
9677 | ||
d62e201c LC |
9678 | @cindex system service |
9679 | At the bottom, we see the @dfn{system service}, which produces the | |
9680 | directory containing everything to run and boot the system, as returned | |
9681 | by the @command{guix system build} command. @xref{Service Reference}, | |
9682 | to learn about the other service types shown here. | |
d6c3267a LC |
9683 | @xref{system-extension-graph, the @command{guix system extension-graph} |
9684 | command}, for information on how to generate this representation for a | |
9685 | particular operating system definition. | |
0adfe95a LC |
9686 | |
9687 | @cindex service types | |
9688 | Technically, developers can define @dfn{service types} to express these | |
9689 | relations. There can be any number of services of a given type on the | |
9690 | system---for instance, a system running two instances of the GNU secure | |
9691 | shell server (lsh) has two instances of @var{lsh-service-type}, with | |
9692 | different parameters. | |
9693 | ||
9694 | The following section describes the programming interface for service | |
9695 | types and services. | |
9696 | ||
9697 | @node Service Types and Services | |
9698 | @subsubsection Service Types and Services | |
9699 | ||
9700 | A @dfn{service type} is a node in the DAG described above. Let us start | |
9701 | with a simple example, the service type for the Guix build daemon | |
9702 | (@pxref{Invoking guix-daemon}): | |
9703 | ||
9704 | @example | |
9705 | (define guix-service-type | |
9706 | (service-type | |
9707 | (name 'guix) | |
9708 | (extensions | |
d4053c71 | 9709 | (list (service-extension shepherd-root-service-type guix-shepherd-service) |
0adfe95a LC |
9710 | (service-extension account-service-type guix-accounts) |
9711 | (service-extension activation-service-type guix-activation))))) | |
9712 | @end example | |
8451a568 | 9713 | |
cf4a9129 | 9714 | @noindent |
0adfe95a LC |
9715 | It defines a two things: |
9716 | ||
9717 | @enumerate | |
9718 | @item | |
9719 | A name, whose sole purpose is to make inspection and debugging easier. | |
9720 | ||
9721 | @item | |
9722 | A list of @dfn{service extensions}, where each extension designates the | |
9723 | target service type and a procedure that, given the service's | |
9724 | parameters, returns a list of object to extend the service of that type. | |
9725 | ||
9726 | Every service type has at least one service extension. The only | |
9727 | exception is the @dfn{boot service type}, which is the ultimate service. | |
9728 | @end enumerate | |
9729 | ||
9730 | In this example, @var{guix-service-type} extends three services: | |
9731 | ||
9732 | @table @var | |
d4053c71 AK |
9733 | @item shepherd-root-service-type |
9734 | The @var{guix-shepherd-service} procedure defines how the Shepherd | |
9735 | service is extended. Namely, it returns a @code{<shepherd-service>} | |
9736 | object that defines how @command{guix-daemon} is started and stopped | |
9737 | (@pxref{Shepherd Services}). | |
0adfe95a LC |
9738 | |
9739 | @item account-service-type | |
9740 | This extension for this service is computed by @var{guix-accounts}, | |
9741 | which returns a list of @code{user-group} and @code{user-account} | |
9742 | objects representing the build user accounts (@pxref{Invoking | |
9743 | guix-daemon}). | |
9744 | ||
9745 | @item activation-service-type | |
9746 | Here @var{guix-activation} is a procedure that returns a gexp, which is | |
9747 | a code snippet to run at ``activation time''---e.g., when the service is | |
9748 | booted. | |
9749 | @end table | |
9750 | ||
9751 | A service of this type is instantiated like this: | |
9752 | ||
9753 | @example | |
9754 | (service guix-service-type | |
9755 | (guix-configuration | |
9756 | (build-accounts 5) | |
9757 | (use-substitutes? #f))) | |
9758 | @end example | |
9759 | ||
9760 | The second argument to the @code{service} form is a value representing | |
9761 | the parameters of this specific service instance. | |
9762 | @xref{guix-configuration-type, @code{guix-configuration}}, for | |
9763 | information about the @code{guix-configuration} data type. | |
9764 | ||
9765 | @var{guix-service-type} is quite simple because it extends other | |
9766 | services but is not extensible itself. | |
9767 | ||
9768 | @c @subsubsubsection Extensible Service Types | |
9769 | ||
9770 | The service type for an @emph{extensible} service looks like this: | |
9771 | ||
9772 | @example | |
9773 | (define udev-service-type | |
9774 | (service-type (name 'udev) | |
9775 | (extensions | |
d4053c71 AK |
9776 | (list (service-extension shepherd-root-service-type |
9777 | udev-shepherd-service))) | |
0adfe95a LC |
9778 | |
9779 | (compose concatenate) ;concatenate the list of rules | |
9780 | (extend (lambda (config rules) | |
9781 | (match config | |
9782 | (($ <udev-configuration> udev initial-rules) | |
9783 | (udev-configuration | |
9784 | (udev udev) ;the udev package to use | |
9785 | (rules (append initial-rules rules))))))))) | |
9786 | @end example | |
9787 | ||
9788 | This is the service type for the | |
9789 | @uref{https://wiki.gentoo.org/wiki/Project:Eudev, eudev device | |
9790 | management daemon}. Compared to the previous example, in addition to an | |
d4053c71 | 9791 | extension of @var{shepherd-root-service-type}, we see two new fields: |
0adfe95a LC |
9792 | |
9793 | @table @code | |
9794 | @item compose | |
9795 | This is the procedure to @dfn{compose} the list of extensions to | |
9796 | services of this type. | |
9797 | ||
9798 | Services can extend the udev service by passing it lists of rules; we | |
9799 | compose those extensions simply by concatenating them. | |
9800 | ||
9801 | @item extend | |
9802 | This procedure defines how the service's value is @dfn{extended} with | |
9803 | the composition of the extensions. | |
9804 | ||
9805 | Udev extensions are composed into a list of rules, but the udev service | |
9806 | value is itself a @code{<udev-configuration>} record. So here, we | |
9807 | extend that record by appending the list of rules is contains to the | |
9808 | list of contributed rules. | |
9809 | @end table | |
9810 | ||
9811 | There can be only one instance of an extensible service type such as | |
9812 | @var{udev-service-type}. If there were more, the | |
9813 | @code{service-extension} specifications would be ambiguous. | |
9814 | ||
9815 | Still here? The next section provides a reference of the programming | |
9816 | interface for services. | |
9817 | ||
9818 | @node Service Reference | |
9819 | @subsubsection Service Reference | |
9820 | ||
9821 | We have seen an overview of service types (@pxref{Service Types and | |
9822 | Services}). This section provides a reference on how to manipulate | |
9823 | services and service types. This interface is provided by the | |
9824 | @code{(gnu services)} module. | |
9825 | ||
9826 | @deffn {Scheme Procedure} service @var{type} @var{value} | |
9827 | Return a new service of @var{type}, a @code{<service-type>} object (see | |
9828 | below.) @var{value} can be any object; it represents the parameters of | |
9829 | this particular service instance. | |
9830 | @end deffn | |
9831 | ||
9832 | @deffn {Scheme Procedure} service? @var{obj} | |
9833 | Return true if @var{obj} is a service. | |
9834 | @end deffn | |
8451a568 | 9835 | |
0adfe95a LC |
9836 | @deffn {Scheme Procedure} service-kind @var{service} |
9837 | Return the type of @var{service}---i.e., a @code{<service-type>} object. | |
9838 | @end deffn | |
9839 | ||
9840 | @deffn {Scheme Procedure} service-parameters @var{service} | |
9841 | Return the value associated with @var{service}. It represents its | |
9842 | parameters. | |
9843 | @end deffn | |
9844 | ||
9845 | Here is an example of how a service is created and manipulated: | |
9846 | ||
9847 | @example | |
9848 | (define s | |
9849 | (service nginx-service-type | |
9850 | (nginx-configuration | |
9851 | (nginx nginx) | |
9852 | (log-directory log-directory) | |
9853 | (run-directory run-directory) | |
9854 | (file config-file)))) | |
9855 | ||
9856 | (service? s) | |
9857 | @result{} #t | |
9858 | ||
9859 | (eq? (service-kind s) nginx-service-type) | |
9860 | @result{} #t | |
9861 | @end example | |
9862 | ||
cd6f6c22 LC |
9863 | The @code{modify-services} form provides a handy way to change the |
9864 | parameters of some of the services of a list such as | |
9865 | @var{%base-services} (@pxref{Base Services, @code{%base-services}}). Of | |
9866 | course, you could always use standard list combinators such as | |
9867 | @code{map} and @code{fold} to do that (@pxref{SRFI-1, List Library,, | |
9868 | guile, GNU Guile Reference Manual}); @code{modify-services} simply | |
9869 | provides a more concise form for this common pattern. | |
9870 | ||
9871 | @deffn {Scheme Syntax} modify-services @var{services} @ | |
9872 | (@var{type} @var{variable} => @var{body}) @dots{} | |
9873 | ||
9874 | Modify the services listed in @var{services} according to the given | |
9875 | clauses. Each clause has the form: | |
9876 | ||
9877 | @example | |
9878 | (@var{type} @var{variable} => @var{body}) | |
9879 | @end example | |
9880 | ||
9881 | where @var{type} is a service type, such as @var{guix-service-type}, and | |
9882 | @var{variable} is an identifier that is bound within @var{body} to the | |
9883 | value of the service of that @var{type}. @xref{Using the Configuration | |
9884 | System}, for an example. | |
9885 | ||
9886 | This is a shorthand for: | |
9887 | ||
9888 | @example | |
9889 | (map (lambda (service) @dots{}) @var{services}) | |
9890 | @end example | |
9891 | @end deffn | |
9892 | ||
9893 | Next comes the programming interface for service types. This is | |
9894 | something you want to know when writing new service definitions, but not | |
9895 | necessarily when simply looking for ways to customize your | |
9896 | @code{operating-system} declaration. | |
9897 | ||
0adfe95a LC |
9898 | @deftp {Data Type} service-type |
9899 | @cindex service type | |
9900 | This is the representation of a @dfn{service type} (@pxref{Service Types | |
9901 | and Services}). | |
9902 | ||
9903 | @table @asis | |
9904 | @item @code{name} | |
9905 | This is a symbol, used only to simplify inspection and debugging. | |
9906 | ||
9907 | @item @code{extensions} | |
9908 | A non-empty list of @code{<service-extension>} objects (see below.) | |
9909 | ||
9910 | @item @code{compose} (default: @code{#f}) | |
9911 | If this is @code{#f}, then the service type denotes services that cannot | |
9912 | be extended---i.e., services that do not receive ``values'' from other | |
9913 | services. | |
9914 | ||
9915 | Otherwise, it must be a one-argument procedure. The procedure is called | |
9916 | by @code{fold-services} and is passed a list of values collected from | |
9917 | extensions. It must return a value that is a valid parameter value for | |
9918 | the service instance. | |
9919 | ||
9920 | @item @code{extend} (default: @code{#f}) | |
9921 | If this is @code{#f}, services of this type cannot be extended. | |
9922 | ||
9923 | Otherwise, it must be a two-argument procedure: @code{fold-services} | |
9924 | calls it, passing it the service's initial value as the first argument | |
9925 | and the result of applying @code{compose} to the extension values as the | |
9926 | second argument. | |
9927 | @end table | |
9928 | ||
9929 | @xref{Service Types and Services}, for examples. | |
9930 | @end deftp | |
9931 | ||
9932 | @deffn {Scheme Procedure} service-extension @var{target-type} @ | |
9933 | @var{compute} | |
9934 | Return a new extension for services of type @var{target-type}. | |
9935 | @var{compute} must be a one-argument procedure: @code{fold-services} | |
9936 | calls it, passing it the value associated with the service that provides | |
9937 | the extension; it must return a valid value for the target service. | |
9938 | @end deffn | |
9939 | ||
9940 | @deffn {Scheme Procedure} service-extension? @var{obj} | |
9941 | Return true if @var{obj} is a service extension. | |
9942 | @end deffn | |
9943 | ||
9944 | At the core of the service abstraction lies the @code{fold-services} | |
9945 | procedure, which is responsible for ``compiling'' a list of services | |
d62e201c LC |
9946 | down to a single directory that contains everything needed to boot and |
9947 | run the system---the directory shown by the @command{guix system build} | |
9948 | command (@pxref{Invoking guix system}). In essence, it propagates | |
9949 | service extensions down the service graph, updating each node parameters | |
9950 | on the way, until it reaches the root node. | |
0adfe95a LC |
9951 | |
9952 | @deffn {Scheme Procedure} fold-services @var{services} @ | |
d62e201c | 9953 | [#:target-type @var{system-service-type}] |
0adfe95a LC |
9954 | Fold @var{services} by propagating their extensions down to the root of |
9955 | type @var{target-type}; return the root service adjusted accordingly. | |
9956 | @end deffn | |
9957 | ||
9958 | Lastly, the @code{(gnu services)} module also defines several essential | |
9959 | service types, some of which are listed below. | |
9960 | ||
d62e201c LC |
9961 | @defvr {Scheme Variable} system-service-type |
9962 | This is the root of the service graph. It produces the system directory | |
9963 | as returned by the @command{guix system build} command. | |
9964 | @end defvr | |
9965 | ||
0adfe95a | 9966 | @defvr {Scheme Variable} boot-service-type |
d62e201c LC |
9967 | The type of the ``boot service'', which produces the @dfn{boot script}. |
9968 | The boot script is what the initial RAM disk runs when booting. | |
0adfe95a LC |
9969 | @end defvr |
9970 | ||
9971 | @defvr {Scheme Variable} etc-service-type | |
9972 | The type of the @file{/etc} service. This service can be extended by | |
9973 | passing it name/file tuples such as: | |
9974 | ||
9975 | @example | |
9976 | (list `("issue" ,(plain-file "issue" "Welcome!\n"))) | |
9977 | @end example | |
9978 | ||
9979 | In this example, the effect would be to add an @file{/etc/issue} file | |
9980 | pointing to the given file. | |
9981 | @end defvr | |
9982 | ||
9983 | @defvr {Scheme Variable} setuid-program-service-type | |
9984 | Type for the ``setuid-program service''. This service collects lists of | |
9985 | executable file names, passed as gexps, and adds them to the set of | |
9986 | setuid-root programs on the system (@pxref{Setuid Programs}). | |
9987 | @end defvr | |
9988 | ||
af4c3fd5 LC |
9989 | @defvr {Scheme Variable} profile-service-type |
9990 | Type of the service that populates the @dfn{system profile}---i.e., the | |
9991 | programs under @file{/run/current-system/profile}. Other services can | |
9992 | extend it by passing it lists of packages to add to the system profile. | |
9993 | @end defvr | |
9994 | ||
0adfe95a | 9995 | |
dd17bc38 AK |
9996 | @node Shepherd Services |
9997 | @subsubsection Shepherd Services | |
0adfe95a LC |
9998 | |
9999 | @cindex PID 1 | |
10000 | @cindex init system | |
0190c1c0 AK |
10001 | The @code{(gnu services shepherd)} provides a way to define services |
10002 | managed by the GNU@tie{}Shepherd, which is GuixSD initialization | |
10003 | system---the first process that is started when the system boots, | |
10004 | aka. PID@tie{}1 (@pxref{Introduction,,, shepherd, The GNU Shepherd | |
10005 | Manual}). | |
6f305ea5 | 10006 | |
dd17bc38 AK |
10007 | Services in the Shepherd can depend on each other. For instance, the |
10008 | SSH daemon may need to be started after the syslog daemon has been | |
10009 | started, which in turn can only happen once all the file systems have | |
10010 | been mounted. The simple operating system defined earlier (@pxref{Using | |
10011 | the Configuration System}) results in a service graph like this: | |
6f305ea5 | 10012 | |
710fa231 | 10013 | @image{images/shepherd-graph,,5in,Typical shepherd service graph.} |
6f305ea5 LC |
10014 | |
10015 | You can actually generate such a graph for any operating system | |
710fa231 AK |
10016 | definition using the @command{guix system shepherd-graph} command |
10017 | (@pxref{system-shepherd-graph, @command{guix system shepherd-graph}}). | |
6f305ea5 | 10018 | |
d4053c71 AK |
10019 | The @var{%shepherd-root-service} is a service object representing |
10020 | PID@tie{}1, of type @var{shepherd-root-service-type}; it can be extended | |
10021 | by passing it lists of @code{<shepherd-service>} objects. | |
0adfe95a | 10022 | |
d4053c71 | 10023 | @deftp {Data Type} shepherd-service |
dd17bc38 | 10024 | The data type representing a service managed by the Shepherd. |
0adfe95a LC |
10025 | |
10026 | @table @asis | |
10027 | @item @code{provision} | |
10028 | This is a list of symbols denoting what the service provides. | |
10029 | ||
dd17bc38 AK |
10030 | These are the names that may be passed to @command{herd start}, |
10031 | @command{herd status}, and similar commands (@pxref{Invoking herd,,, | |
10032 | shepherd, The GNU Shepherd Manual}). @xref{Slots of services, the | |
10033 | @code{provides} slot,, shepherd, The GNU Shepherd Manual}, for details. | |
0adfe95a LC |
10034 | |
10035 | @item @code{requirements} (default: @code{'()}) | |
dd17bc38 | 10036 | List of symbols denoting the Shepherd services this one depends on. |
0adfe95a LC |
10037 | |
10038 | @item @code{respawn?} (default: @code{#t}) | |
10039 | Whether to restart the service when it stops, for instance when the | |
10040 | underlying process dies. | |
10041 | ||
10042 | @item @code{start} | |
10043 | @itemx @code{stop} (default: @code{#~(const #f)}) | |
dd17bc38 AK |
10044 | The @code{start} and @code{stop} fields refer to the Shepherd's |
10045 | facilities to start and stop processes (@pxref{Service De- and | |
10046 | Constructors,,, shepherd, The GNU Shepherd Manual}). They are given as | |
10047 | G-expressions that get expanded in the Shepherd configuration file | |
10048 | (@pxref{G-Expressions}). | |
0adfe95a LC |
10049 | |
10050 | @item @code{documentation} | |
10051 | A documentation string, as shown when running: | |
10052 | ||
10053 | @example | |
dd17bc38 | 10054 | herd doc @var{service-name} |
0adfe95a LC |
10055 | @end example |
10056 | ||
10057 | where @var{service-name} is one of the symbols in @var{provision} | |
dd17bc38 | 10058 | (@pxref{Invoking herd,,, shepherd, The GNU Shepherd Manual}). |
fae685b9 LC |
10059 | |
10060 | @item @code{modules} (default: @var{%default-modules}) | |
10061 | This is the list of modules that must be in scope when @code{start} and | |
10062 | @code{stop} are evaluated. | |
10063 | ||
10064 | @item @code{imported-modules} (default: @var{%default-imported-modules}) | |
10065 | This is the list of modules to import in the execution environment of | |
dd17bc38 | 10066 | the Shepherd. |
fae685b9 | 10067 | |
0adfe95a LC |
10068 | @end table |
10069 | @end deftp | |
10070 | ||
d4053c71 | 10071 | @defvr {Scheme Variable} shepherd-root-service-type |
dd17bc38 | 10072 | The service type for the Shepherd ``root service''---i.e., PID@tie{}1. |
0adfe95a LC |
10073 | |
10074 | This is the service type that extensions target when they want to create | |
dd17bc38 | 10075 | shepherd services (@pxref{Service Types and Services}, for an example). |
d4053c71 | 10076 | Each extension must pass a list of @code{<shepherd-service>}. |
0adfe95a LC |
10077 | @end defvr |
10078 | ||
d4053c71 | 10079 | @defvr {Scheme Variable} %shepherd-root-service |
0adfe95a LC |
10080 | This service represents PID@tie{}1. |
10081 | @end defvr | |
8451a568 | 10082 | |
8451a568 | 10083 | |
cf4a9129 LC |
10084 | @node Installing Debugging Files |
10085 | @section Installing Debugging Files | |
8451a568 | 10086 | |
cf4a9129 LC |
10087 | @cindex debugging files |
10088 | Program binaries, as produced by the GCC compilers for instance, are | |
10089 | typically written in the ELF format, with a section containing | |
10090 | @dfn{debugging information}. Debugging information is what allows the | |
10091 | debugger, GDB, to map binary code to source code; it is required to | |
10092 | debug a compiled program in good conditions. | |
8451a568 | 10093 | |
cf4a9129 LC |
10094 | The problem with debugging information is that is takes up a fair amount |
10095 | of disk space. For example, debugging information for the GNU C Library | |
10096 | weighs in at more than 60 MiB. Thus, as a user, keeping all the | |
10097 | debugging info of all the installed programs is usually not an option. | |
10098 | Yet, space savings should not come at the cost of an impediment to | |
10099 | debugging---especially in the GNU system, which should make it easier | |
10100 | for users to exert their computing freedom (@pxref{GNU Distribution}). | |
8451a568 | 10101 | |
cf4a9129 LC |
10102 | Thankfully, the GNU Binary Utilities (Binutils) and GDB provide a |
10103 | mechanism that allows users to get the best of both worlds: debugging | |
10104 | information can be stripped from the binaries and stored in separate | |
10105 | files. GDB is then able to load debugging information from those files, | |
10106 | when they are available (@pxref{Separate Debug Files,,, gdb, Debugging | |
10107 | with GDB}). | |
8451a568 | 10108 | |
cf4a9129 LC |
10109 | The GNU distribution takes advantage of this by storing debugging |
10110 | information in the @code{lib/debug} sub-directory of a separate package | |
10111 | output unimaginatively called @code{debug} (@pxref{Packages with | |
10112 | Multiple Outputs}). Users can choose to install the @code{debug} output | |
10113 | of a package when they need it. For instance, the following command | |
10114 | installs the debugging information for the GNU C Library and for GNU | |
10115 | Guile: | |
8451a568 LC |
10116 | |
10117 | @example | |
cf4a9129 | 10118 | guix package -i glibc:debug guile:debug |
8451a568 LC |
10119 | @end example |
10120 | ||
cf4a9129 LC |
10121 | GDB must then be told to look for debug files in the user's profile, by |
10122 | setting the @code{debug-file-directory} variable (consider setting it | |
10123 | from the @file{~/.gdbinit} file, @pxref{Startup,,, gdb, Debugging with | |
10124 | GDB}): | |
8451a568 | 10125 | |
cf4a9129 LC |
10126 | @example |
10127 | (gdb) set debug-file-directory ~/.guix-profile/lib/debug | |
10128 | @end example | |
8451a568 | 10129 | |
cf4a9129 LC |
10130 | From there on, GDB will pick up debugging information from the |
10131 | @code{.debug} files under @file{~/.guix-profile/lib/debug}. | |
8451a568 | 10132 | |
cf4a9129 LC |
10133 | In addition, you will most likely want GDB to be able to show the source |
10134 | code being debugged. To do that, you will have to unpack the source | |
10135 | code of the package of interest (obtained with @code{guix build | |
10136 | --source}, @pxref{Invoking guix build}), and to point GDB to that source | |
10137 | directory using the @code{directory} command (@pxref{Source Path, | |
10138 | @code{directory},, gdb, Debugging with GDB}). | |
8451a568 | 10139 | |
cf4a9129 LC |
10140 | @c XXX: keep me up-to-date |
10141 | The @code{debug} output mechanism in Guix is implemented by the | |
10142 | @code{gnu-build-system} (@pxref{Build Systems}). Currently, it is | |
10143 | opt-in---debugging information is available only for those packages | |
10144 | whose definition explicitly declares a @code{debug} output. This may be | |
10145 | changed to opt-out in the future, if our build farm servers can handle | |
10146 | the load. To check whether a package has a @code{debug} output, use | |
10147 | @command{guix package --list-available} (@pxref{Invoking guix package}). | |
8451a568 | 10148 | |
8451a568 | 10149 | |
05962f29 LC |
10150 | @node Security Updates |
10151 | @section Security Updates | |
10152 | ||
843858b8 LC |
10153 | @quotation Note |
10154 | As of version @value{VERSION}, the feature described in this section is | |
10155 | experimental. | |
10156 | @end quotation | |
05962f29 LC |
10157 | |
10158 | @cindex security updates | |
10159 | Occasionally, important security vulnerabilities are discovered in core | |
10160 | software packages and must be patched. Guix follows a functional | |
10161 | package management discipline (@pxref{Introduction}), which implies | |
10162 | that, when a package is changed, @emph{every package that depends on it} | |
10163 | must be rebuilt. This can significantly slow down the deployment of | |
10164 | fixes in core packages such as libc or Bash, since basically the whole | |
10165 | distribution would need to be rebuilt. Using pre-built binaries helps | |
10166 | (@pxref{Substitutes}), but deployment may still take more time than | |
10167 | desired. | |
10168 | ||
10169 | @cindex grafts | |
10170 | To address that, Guix implements @dfn{grafts}, a mechanism that allows | |
10171 | for fast deployment of critical updates without the costs associated | |
10172 | with a whole-distribution rebuild. The idea is to rebuild only the | |
10173 | package that needs to be patched, and then to ``graft'' it onto packages | |
10174 | explicitly installed by the user and that were previously referring to | |
10175 | the original package. The cost of grafting is typically very low, and | |
10176 | order of magnitudes lower than a full rebuild of the dependency chain. | |
10177 | ||
10178 | @cindex replacements of packages, for grafts | |
10179 | For instance, suppose a security update needs to be applied to Bash. | |
10180 | Guix developers will provide a package definition for the ``fixed'' | |
10181 | Bash, say @var{bash-fixed}, in the usual way (@pxref{Defining | |
10182 | Packages}). Then, the original package definition is augmented with a | |
10183 | @code{replacement} field pointing to the package containing the bug fix: | |
10184 | ||
10185 | @example | |
10186 | (define bash | |
10187 | (package | |
10188 | (name "bash") | |
10189 | ;; @dots{} | |
10190 | (replacement bash-fixed))) | |
10191 | @end example | |
10192 | ||
10193 | From there on, any package depending directly or indirectly on Bash that | |
10194 | is installed will automatically be ``rewritten'' to refer to | |
10195 | @var{bash-fixed} instead of @var{bash}. This grafting process takes | |
10196 | time proportional to the size of the package, but expect less than a | |
10197 | minute for an ``average'' package on a recent machine. | |
10198 | ||
10199 | Currently, the graft and the package it replaces (@var{bash-fixed} and | |
10200 | @var{bash} in the example above) must have the exact same @code{name} | |
10201 | and @code{version} fields. This restriction mostly comes from the fact | |
10202 | that grafting works by patching files, including binary files, directly. | |
10203 | Other restrictions may apply: for instance, when adding a graft to a | |
10204 | package providing a shared library, the original shared library and its | |
10205 | replacement must have the same @code{SONAME} and be binary-compatible. | |
10206 | ||
10207 | ||
cf4a9129 LC |
10208 | @node Package Modules |
10209 | @section Package Modules | |
8451a568 | 10210 | |
cf4a9129 LC |
10211 | From a programming viewpoint, the package definitions of the |
10212 | GNU distribution are provided by Guile modules in the @code{(gnu packages | |
10213 | @dots{})} name space@footnote{Note that packages under the @code{(gnu | |
10214 | packages @dots{})} module name space are not necessarily ``GNU | |
10215 | packages''. This module naming scheme follows the usual Guile module | |
10216 | naming convention: @code{gnu} means that these modules are distributed | |
10217 | as part of the GNU system, and @code{packages} identifies modules that | |
10218 | define packages.} (@pxref{Modules, Guile modules,, guile, GNU Guile | |
10219 | Reference Manual}). For instance, the @code{(gnu packages emacs)} | |
10220 | module exports a variable named @code{emacs}, which is bound to a | |
10221 | @code{<package>} object (@pxref{Defining Packages}). | |
113daf62 | 10222 | |
300868ba | 10223 | The @code{(gnu packages @dots{})} module name space is |
cf4a9129 LC |
10224 | automatically scanned for packages by the command-line tools. For |
10225 | instance, when running @code{guix package -i emacs}, all the @code{(gnu | |
10226 | packages @dots{})} modules are scanned until one that exports a package | |
10227 | object whose name is @code{emacs} is found. This package search | |
10228 | facility is implemented in the @code{(gnu packages)} module. | |
113daf62 | 10229 | |
300868ba | 10230 | @cindex customization, of packages |
8689901f | 10231 | @cindex package module search path |
cf4a9129 | 10232 | Users can store package definitions in modules with different |
60142854 | 10233 | names---e.g., @code{(my-packages emacs)}@footnote{Note that the file |
c95ded7e LC |
10234 | name and module name must match. For instance, the @code{(my-packages |
10235 | emacs)} module must be stored in a @file{my-packages/emacs.scm} file | |
10236 | relative to the load path specified with @option{--load-path} or | |
10237 | @code{GUIX_PACKAGE_PATH}. @xref{Modules and the File System,,, | |
10238 | guile, GNU Guile Reference Manual}, for details.}. These package definitions | |
300868ba LC |
10239 | will not be visible by default. Thus, users can invoke commands such as |
10240 | @command{guix package} and @command{guix build} have to be used with the | |
c95ded7e LC |
10241 | @code{-e} option so that they know where to find the package. Better |
10242 | yet, they can use the | |
300868ba | 10243 | @code{-L} option of these commands to make those modules visible |
8689901f LC |
10244 | (@pxref{Invoking guix build, @code{--load-path}}), or define the |
10245 | @code{GUIX_PACKAGE_PATH} environment variable. This environment | |
10246 | variable makes it easy to extend or customize the distribution and is | |
10247 | honored by all the user interfaces. | |
10248 | ||
10249 | @defvr {Environment Variable} GUIX_PACKAGE_PATH | |
10250 | This is a colon-separated list of directories to search for package | |
10251 | modules. Directories listed in this variable take precedence over the | |
10252 | distribution's own modules. | |
10253 | @end defvr | |
ef5dd60a | 10254 | |
cf4a9129 LC |
10255 | The distribution is fully @dfn{bootstrapped} and @dfn{self-contained}: |
10256 | each package is built based solely on other packages in the | |
10257 | distribution. The root of this dependency graph is a small set of | |
10258 | @dfn{bootstrap binaries}, provided by the @code{(gnu packages | |
10259 | bootstrap)} module. For more information on bootstrapping, | |
081145cf | 10260 | @pxref{Bootstrapping}. |
ef5dd60a | 10261 | |
cf4a9129 LC |
10262 | @node Packaging Guidelines |
10263 | @section Packaging Guidelines | |
ef5dd60a | 10264 | |
cf4a9129 LC |
10265 | The GNU distribution is nascent and may well lack some of your favorite |
10266 | packages. This section describes how you can help make the distribution | |
10267 | grow. @xref{Contributing}, for additional information on how you can | |
10268 | help. | |
ef5dd60a | 10269 | |
cf4a9129 LC |
10270 | Free software packages are usually distributed in the form of |
10271 | @dfn{source code tarballs}---typically @file{tar.gz} files that contain | |
10272 | all the source files. Adding a package to the distribution means | |
10273 | essentially two things: adding a @dfn{recipe} that describes how to | |
10274 | build the package, including a list of other packages required to build | |
f97c9175 | 10275 | it, and adding @dfn{package metadata} along with that recipe, such as a |
cf4a9129 | 10276 | description and licensing information. |
ef5dd60a | 10277 | |
cf4a9129 LC |
10278 | In Guix all this information is embodied in @dfn{package definitions}. |
10279 | Package definitions provide a high-level view of the package. They are | |
10280 | written using the syntax of the Scheme programming language; in fact, | |
10281 | for each package we define a variable bound to the package definition, | |
10282 | and export that variable from a module (@pxref{Package Modules}). | |
10283 | However, in-depth Scheme knowledge is @emph{not} a prerequisite for | |
10284 | creating packages. For more information on package definitions, | |
081145cf | 10285 | @pxref{Defining Packages}. |
ef5dd60a | 10286 | |
cf4a9129 LC |
10287 | Once a package definition is in place, stored in a file in the Guix |
10288 | source tree, it can be tested using the @command{guix build} command | |
10289 | (@pxref{Invoking guix build}). For example, assuming the new package is | |
c71979f4 LC |
10290 | called @code{gnew}, you may run this command from the Guix build tree |
10291 | (@pxref{Running Guix Before It Is Installed}): | |
ef5dd60a LC |
10292 | |
10293 | @example | |
cf4a9129 | 10294 | ./pre-inst-env guix build gnew --keep-failed |
ef5dd60a | 10295 | @end example |
ef5dd60a | 10296 | |
cf4a9129 LC |
10297 | Using @code{--keep-failed} makes it easier to debug build failures since |
10298 | it provides access to the failed build tree. Another useful | |
10299 | command-line option when debugging is @code{--log-file}, to access the | |
10300 | build log. | |
ef5dd60a | 10301 | |
cf4a9129 LC |
10302 | If the package is unknown to the @command{guix} command, it may be that |
10303 | the source file contains a syntax error, or lacks a @code{define-public} | |
10304 | clause to export the package variable. To figure it out, you may load | |
10305 | the module from Guile to get more information about the actual error: | |
ef5dd60a | 10306 | |
cf4a9129 LC |
10307 | @example |
10308 | ./pre-inst-env guile -c '(use-modules (gnu packages gnew))' | |
10309 | @end example | |
ef5dd60a | 10310 | |
cf4a9129 LC |
10311 | Once your package builds correctly, please send us a patch |
10312 | (@pxref{Contributing}). Well, if you need help, we will be happy to | |
10313 | help you too. Once the patch is committed in the Guix repository, the | |
10314 | new package automatically gets built on the supported platforms by | |
2b1cee21 | 10315 | @url{http://hydra.gnu.org/jobset/gnu/master, our continuous integration |
cf4a9129 | 10316 | system}. |
ef5dd60a | 10317 | |
cf4a9129 LC |
10318 | @cindex substituter |
10319 | Users can obtain the new package definition simply by running | |
10320 | @command{guix pull} (@pxref{Invoking guix pull}). When | |
10321 | @code{hydra.gnu.org} is done building the package, installing the | |
10322 | package automatically downloads binaries from there | |
10323 | (@pxref{Substitutes}). The only place where human intervention is | |
10324 | needed is to review and apply the patch. | |
ef5dd60a | 10325 | |
ef5dd60a | 10326 | |
cf4a9129 | 10327 | @menu |
ec0339cd LC |
10328 | * Software Freedom:: What may go into the distribution. |
10329 | * Package Naming:: What's in a name? | |
10330 | * Version Numbers:: When the name is not enough. | |
cbd02397 | 10331 | * Synopses and Descriptions:: Helping users find the right package. |
ec0339cd LC |
10332 | * Python Modules:: Taming the snake. |
10333 | * Perl Modules:: Little pearls. | |
10334 | * Fonts:: Fond of fonts. | |
cf4a9129 | 10335 | @end menu |
ef5dd60a | 10336 | |
cf4a9129 LC |
10337 | @node Software Freedom |
10338 | @subsection Software Freedom | |
ef5dd60a | 10339 | |
cf4a9129 | 10340 | @c Adapted from http://www.gnu.org/philosophy/philosophy.html. |
c11a6eb1 | 10341 | |
cf4a9129 LC |
10342 | The GNU operating system has been developed so that users can have |
10343 | freedom in their computing. GNU is @dfn{free software}, meaning that | |
10344 | users have the @url{http://www.gnu.org/philosophy/free-sw.html,four | |
10345 | essential freedoms}: to run the program, to study and change the program | |
10346 | in source code form, to redistribute exact copies, and to distribute | |
10347 | modified versions. Packages found in the GNU distribution provide only | |
10348 | software that conveys these four freedoms. | |
c11a6eb1 | 10349 | |
cf4a9129 LC |
10350 | In addition, the GNU distribution follow the |
10351 | @url{http://www.gnu.org/distros/free-system-distribution-guidelines.html,free | |
10352 | software distribution guidelines}. Among other things, these guidelines | |
10353 | reject non-free firmware, recommendations of non-free software, and | |
10354 | discuss ways to deal with trademarks and patents. | |
ef5dd60a | 10355 | |
cf4a9129 LC |
10356 | Some packages contain a small and optional subset that violates the |
10357 | above guidelines, for instance because this subset is itself non-free | |
10358 | code. When that happens, the offending items are removed with | |
10359 | appropriate patches or code snippets in the package definition's | |
10360 | @code{origin} form (@pxref{Defining Packages}). That way, @code{guix | |
10361 | build --source} returns the ``freed'' source rather than the unmodified | |
10362 | upstream source. | |
ef5dd60a | 10363 | |
ef5dd60a | 10364 | |
cf4a9129 LC |
10365 | @node Package Naming |
10366 | @subsection Package Naming | |
ef5dd60a | 10367 | |
cf4a9129 LC |
10368 | A package has actually two names associated with it: |
10369 | First, there is the name of the @emph{Scheme variable}, the one following | |
10370 | @code{define-public}. By this name, the package can be made known in the | |
10371 | Scheme code, for instance as input to another package. Second, there is | |
10372 | the string in the @code{name} field of a package definition. This name | |
10373 | is used by package management commands such as | |
10374 | @command{guix package} and @command{guix build}. | |
ef5dd60a | 10375 | |
cf4a9129 LC |
10376 | Both are usually the same and correspond to the lowercase conversion of |
10377 | the project name chosen upstream, with underscores replaced with | |
10378 | hyphens. For instance, GNUnet is available as @code{gnunet}, and | |
10379 | SDL_net as @code{sdl-net}. | |
927097ef | 10380 | |
cf4a9129 | 10381 | We do not add @code{lib} prefixes for library packages, unless these are |
081145cf | 10382 | already part of the official project name. But @pxref{Python |
cf4a9129 LC |
10383 | Modules} and @ref{Perl Modules} for special rules concerning modules for |
10384 | the Python and Perl languages. | |
927097ef | 10385 | |
1b366ee4 | 10386 | Font package names are handled differently, @pxref{Fonts}. |
7fec52b7 | 10387 | |
ef5dd60a | 10388 | |
cf4a9129 LC |
10389 | @node Version Numbers |
10390 | @subsection Version Numbers | |
ef5dd60a | 10391 | |
cf4a9129 LC |
10392 | We usually package only the latest version of a given free software |
10393 | project. But sometimes, for instance for incompatible library versions, | |
10394 | two (or more) versions of the same package are needed. These require | |
10395 | different Scheme variable names. We use the name as defined | |
10396 | in @ref{Package Naming} | |
10397 | for the most recent version; previous versions use the same name, suffixed | |
10398 | by @code{-} and the smallest prefix of the version number that may | |
10399 | distinguish the two versions. | |
ef5dd60a | 10400 | |
cf4a9129 LC |
10401 | The name inside the package definition is the same for all versions of a |
10402 | package and does not contain any version number. | |
ef5dd60a | 10403 | |
cf4a9129 | 10404 | For instance, the versions 2.24.20 and 3.9.12 of GTK+ may be packaged as follows: |
ef5dd60a | 10405 | |
cf4a9129 LC |
10406 | @example |
10407 | (define-public gtk+ | |
10408 | (package | |
17d8e33f ML |
10409 | (name "gtk+") |
10410 | (version "3.9.12") | |
10411 | ...)) | |
cf4a9129 LC |
10412 | (define-public gtk+-2 |
10413 | (package | |
17d8e33f ML |
10414 | (name "gtk+") |
10415 | (version "2.24.20") | |
10416 | ...)) | |
cf4a9129 LC |
10417 | @end example |
10418 | If we also wanted GTK+ 3.8.2, this would be packaged as | |
10419 | @example | |
10420 | (define-public gtk+-3.8 | |
10421 | (package | |
17d8e33f ML |
10422 | (name "gtk+") |
10423 | (version "3.8.2") | |
10424 | ...)) | |
cf4a9129 | 10425 | @end example |
ef5dd60a | 10426 | |
880d647d LC |
10427 | @c See <https://lists.gnu.org/archive/html/guix-devel/2016-01/msg00425.html>, |
10428 | @c for a discussion of what follows. | |
10429 | @cindex version number, for VCS snapshots | |
10430 | Occasionally, we package snapshots of upstream's version control system | |
10431 | (VCS) instead of formal releases. This should remain exceptional, | |
10432 | because it is up to upstream developers to clarify what the stable | |
10433 | release is. Yet, it is sometimes necessary. So, what should we put in | |
10434 | the @code{version} field? | |
10435 | ||
10436 | Clearly, we need to make the commit identifier of the VCS snapshot | |
10437 | visible in the version string, but we also need to make sure that the | |
10438 | version string is monotonically increasing so that @command{guix package | |
10439 | --upgrade} can determine which version is newer. Since commit | |
10440 | identifiers, notably with Git, are not monotonically increasing, we add | |
10441 | a revision number that we increase each time we upgrade to a newer | |
10442 | snapshot. The resulting version string looks like this: | |
10443 | ||
10444 | @example | |
10445 | 2.0.11-3.cabba9e | |
10446 | ^ ^ ^ | |
10447 | | | `-- upstream commit ID | |
10448 | | | | |
10449 | | `--- Guix package revision | |
10450 | | | |
10451 | latest upstream version | |
10452 | @end example | |
10453 | ||
10454 | It is a good idea to strip commit identifiers in the @code{version} | |
10455 | field to, say, 7 digits. It avoids an aesthetic annoyance (assuming | |
10456 | aesthetics have a role to play here) as well as problems related to OS | |
10457 | limits such as the maximum shebang length (127 bytes for the Linux | |
10458 | kernel.) It is best to use the full commit identifiers in | |
10459 | @code{origin}s, though, to avoid ambiguities. | |
10460 | ||
cbd02397 LC |
10461 | @node Synopses and Descriptions |
10462 | @subsection Synopses and Descriptions | |
10463 | ||
10464 | As we have seen before, each package in GNU@tie{}Guix includes a | |
10465 | synopsis and a description (@pxref{Defining Packages}). Synopses and | |
10466 | descriptions are important: They are what @command{guix package | |
10467 | --search} searches, and a crucial piece of information to help users | |
10468 | determine whether a given package suits their needs. Consequently, | |
10469 | packagers should pay attention to what goes into them. | |
10470 | ||
10471 | Synopses must start with a capital letter and must not end with a | |
10472 | period. They must not start with ``a'' or ``the'', which usually does | |
10473 | not bring anything; for instance, prefer ``File-frobbing tool'' over ``A | |
10474 | tool that frobs files''. The synopsis should say what the package | |
10475 | is---e.g., ``Core GNU utilities (file, text, shell)''---or what it is | |
10476 | used for---e.g., the synopsis for GNU@tie{}grep is ``Print lines | |
10477 | matching a pattern''. | |
10478 | ||
10479 | Keep in mind that the synopsis must be meaningful for a very wide | |
10480 | audience. For example, ``Manipulate alignments in the SAM format'' | |
10481 | might make sense for a seasoned bioinformatics researcher, but might be | |
10482 | fairly unhelpful or even misleading to a non-specialized audience. It | |
10483 | is a good idea to come up with a synopsis that gives an idea of the | |
10484 | application domain of the package. In this example, this might give | |
10485 | something like ``Manipulate nucleotide sequence alignments'', which | |
10486 | hopefully gives the user a better idea of whether this is what they are | |
10487 | looking for. | |
10488 | ||
10489 | @cindex Texinfo markup, in package descriptions | |
10490 | Descriptions should take between five and ten lines. Use full | |
10491 | sentences, and avoid using acronyms without first introducing them. | |
10492 | Descriptions can include Texinfo markup, which is useful to introduce | |
10493 | ornaments such as @code{@@code} or @code{@@dfn}, bullet lists, or | |
ba7d6c76 ML |
10494 | hyperlinks (@pxref{Overview,,, texinfo, GNU Texinfo}). However you |
10495 | should be careful when using some characters for example @samp{@@} and | |
10496 | curly braces which are the basic special characters in Texinfo | |
10497 | (@pxref{Special Characters,,, texinfo, GNU Texinfo}). User interfaces | |
10498 | such as @command{guix package --show} take care of rendering it | |
10499 | appropriately. | |
cbd02397 LC |
10500 | |
10501 | Synopses and descriptions are translated by volunteers | |
10502 | @uref{http://translationproject.org/domain/guix-packages.html, at the | |
10503 | Translation Project} so that as many users as possible can read them in | |
10504 | their native language. User interfaces search them and display them in | |
10505 | the language specified by the current locale. | |
10506 | ||
10507 | Translation is a lot of work so, as a packager, please pay even more | |
10508 | attention to your synopses and descriptions as every change may entail | |
ba7d6c76 | 10509 | additional work for translators. In order to help them, it is possible |
36743e71 | 10510 | to make recommendations or instructions visible to them by inserting |
ba7d6c76 ML |
10511 | special comments like this (@pxref{xgettext Invocation,,, gettext, GNU |
10512 | Gettext}): | |
10513 | ||
10514 | @example | |
10515 | ;; TRANSLATORS: "X11 resize-and-rotate" should not be translated. | |
10516 | (description "ARandR is designed to provide a simple visual front end | |
10517 | for the X11 resize-and-rotate (RandR) extension. @dots{}") | |
10518 | @end example | |
cbd02397 | 10519 | |
ef5dd60a | 10520 | |
cf4a9129 LC |
10521 | @node Python Modules |
10522 | @subsection Python Modules | |
ef5dd60a | 10523 | |
cf4a9129 LC |
10524 | We currently package Python 2 and Python 3, under the Scheme variable names |
10525 | @code{python-2} and @code{python} as explained in @ref{Version Numbers}. | |
10526 | To avoid confusion and naming clashes with other programming languages, it | |
10527 | seems desirable that the name of a package for a Python module contains | |
10528 | the word @code{python}. | |
ef5dd60a | 10529 | |
cf4a9129 LC |
10530 | Some modules are compatible with only one version of Python, others with both. |
10531 | If the package Foo compiles only with Python 3, we name it | |
10532 | @code{python-foo}; if it compiles only with Python 2, we name it | |
10533 | @code{python2-foo}. If it is compatible with both versions, we create two | |
10534 | packages with the corresponding names. | |
ef5dd60a | 10535 | |
cf4a9129 LC |
10536 | If a project already contains the word @code{python}, we drop this; |
10537 | for instance, the module python-dateutil is packaged under the names | |
10538 | @code{python-dateutil} and @code{python2-dateutil}. | |
113daf62 | 10539 | |
523e4896 | 10540 | |
cf4a9129 LC |
10541 | @node Perl Modules |
10542 | @subsection Perl Modules | |
523e4896 | 10543 | |
cf4a9129 LC |
10544 | Perl programs standing for themselves are named as any other package, |
10545 | using the lowercase upstream name. | |
10546 | For Perl packages containing a single class, we use the lowercase class name, | |
10547 | replace all occurrences of @code{::} by dashes and prepend the prefix | |
10548 | @code{perl-}. | |
10549 | So the class @code{XML::Parser} becomes @code{perl-xml-parser}. | |
10550 | Modules containing several classes keep their lowercase upstream name and | |
10551 | are also prepended by @code{perl-}. Such modules tend to have the word | |
10552 | @code{perl} somewhere in their name, which gets dropped in favor of the | |
10553 | prefix. For instance, @code{libwww-perl} becomes @code{perl-libwww}. | |
523e4896 | 10554 | |
523e4896 | 10555 | |
7fec52b7 AE |
10556 | @node Fonts |
10557 | @subsection Fonts | |
10558 | ||
10559 | For fonts that are in general not installed by a user for typesetting | |
10560 | purposes, or that are distributed as part of a larger software package, | |
10561 | we rely on the general packaging rules for software; for instance, this | |
10562 | applies to the fonts delivered as part of the X.Org system or fonts that | |
10563 | are part of TeX Live. | |
10564 | ||
10565 | To make it easier for a user to search for fonts, names for other packages | |
10566 | containing only fonts are constructed as follows, independently of the | |
10567 | upstream package name. | |
10568 | ||
10569 | The name of a package containing only one font family starts with | |
10570 | @code{font-}; it is followed by the foundry name and a dash @code{-} | |
10571 | if the foundry is known, and the font family name, in which spaces are | |
10572 | replaced by dashes (and as usual, all upper case letters are transformed | |
10573 | to lower case). | |
10574 | For example, the Gentium font family by SIL is packaged under the name | |
10575 | @code{font-sil-gentium}. | |
10576 | ||
10577 | For a package containing several font families, the name of the collection | |
10578 | is used in the place of the font family name. | |
10579 | For instance, the Liberation fonts consist of three families, | |
10580 | Liberation Sans, Liberation Serif and Liberation Mono. | |
10581 | These could be packaged separately under the names | |
10582 | @code{font-liberation-sans} and so on; but as they are distributed together | |
10583 | under a common name, we prefer to package them together as | |
10584 | @code{font-liberation}. | |
10585 | ||
10586 | In the case where several formats of the same font family or font collection | |
10587 | are packaged separately, a short form of the format, prepended by a dash, | |
10588 | is added to the package name. We use @code{-ttf} for TrueType fonts, | |
1b366ee4 | 10589 | @code{-otf} for OpenType fonts and @code{-type1} for PostScript Type 1 |
7fec52b7 AE |
10590 | fonts. |
10591 | ||
10592 | ||
b25937e3 | 10593 | |
cf4a9129 LC |
10594 | @node Bootstrapping |
10595 | @section Bootstrapping | |
b25937e3 | 10596 | |
cf4a9129 | 10597 | @c Adapted from the ELS 2013 paper. |
b25937e3 | 10598 | |
cf4a9129 | 10599 | @cindex bootstrapping |
7889394e | 10600 | |
cf4a9129 LC |
10601 | Bootstrapping in our context refers to how the distribution gets built |
10602 | ``from nothing''. Remember that the build environment of a derivation | |
10603 | contains nothing but its declared inputs (@pxref{Introduction}). So | |
10604 | there's an obvious chicken-and-egg problem: how does the first package | |
10605 | get built? How does the first compiler get compiled? Note that this is | |
10606 | a question of interest only to the curious hacker, not to the regular | |
10607 | user, so you can shamelessly skip this section if you consider yourself | |
10608 | a ``regular user''. | |
72b9d60d | 10609 | |
cf4a9129 LC |
10610 | @cindex bootstrap binaries |
10611 | The GNU system is primarily made of C code, with libc at its core. The | |
10612 | GNU build system itself assumes the availability of a Bourne shell and | |
10613 | command-line tools provided by GNU Coreutils, Awk, Findutils, `sed', and | |
10614 | `grep'. Furthermore, build programs---programs that run | |
10615 | @code{./configure}, @code{make}, etc.---are written in Guile Scheme | |
10616 | (@pxref{Derivations}). Consequently, to be able to build anything at | |
10617 | all, from scratch, Guix relies on pre-built binaries of Guile, GCC, | |
10618 | Binutils, libc, and the other packages mentioned above---the | |
10619 | @dfn{bootstrap binaries}. | |
72b9d60d | 10620 | |
cf4a9129 LC |
10621 | These bootstrap binaries are ``taken for granted'', though we can also |
10622 | re-create them if needed (more on that later). | |
72b9d60d | 10623 | |
cf4a9129 | 10624 | @unnumberedsubsec Preparing to Use the Bootstrap Binaries |
c79d54fe | 10625 | |
cf4a9129 LC |
10626 | @c As of Emacs 24.3, Info-mode displays the image, but since it's a |
10627 | @c large image, it's hard to scroll. Oh well. | |
10628 | @image{images/bootstrap-graph,6in,,Dependency graph of the early bootstrap derivations} | |
523e4896 | 10629 | |
cf4a9129 LC |
10630 | The figure above shows the very beginning of the dependency graph of the |
10631 | distribution, corresponding to the package definitions of the @code{(gnu | |
d33fa0c7 LC |
10632 | packages bootstrap)} module. A similar figure can be generated with |
10633 | @command{guix graph} (@pxref{Invoking guix graph}), along the lines of: | |
10634 | ||
10635 | @example | |
10636 | guix graph -t derivation \ | |
10637 | -e '(@@@@ (gnu packages bootstrap) %bootstrap-gcc)' \ | |
10638 | | dot -Tps > t.ps | |
10639 | @end example | |
10640 | ||
10641 | At this level of detail, things are | |
cf4a9129 LC |
10642 | slightly complex. First, Guile itself consists of an ELF executable, |
10643 | along with many source and compiled Scheme files that are dynamically | |
10644 | loaded when it runs. This gets stored in the @file{guile-2.0.7.tar.xz} | |
10645 | tarball shown in this graph. This tarball is part of Guix's ``source'' | |
10646 | distribution, and gets inserted into the store with @code{add-to-store} | |
10647 | (@pxref{The Store}). | |
2e7b5cea | 10648 | |
cf4a9129 LC |
10649 | But how do we write a derivation that unpacks this tarball and adds it |
10650 | to the store? To solve this problem, the @code{guile-bootstrap-2.0.drv} | |
10651 | derivation---the first one that gets built---uses @code{bash} as its | |
10652 | builder, which runs @code{build-bootstrap-guile.sh}, which in turn calls | |
10653 | @code{tar} to unpack the tarball. Thus, @file{bash}, @file{tar}, | |
10654 | @file{xz}, and @file{mkdir} are statically-linked binaries, also part of | |
10655 | the Guix source distribution, whose sole purpose is to allow the Guile | |
10656 | tarball to be unpacked. | |
fb729425 | 10657 | |
cf4a9129 LC |
10658 | Once @code{guile-bootstrap-2.0.drv} is built, we have a functioning |
10659 | Guile that can be used to run subsequent build programs. Its first task | |
10660 | is to download tarballs containing the other pre-built binaries---this | |
10661 | is what the @code{.tar.xz.drv} derivations do. Guix modules such as | |
10662 | @code{ftp-client.scm} are used for this purpose. The | |
10663 | @code{module-import.drv} derivations import those modules in a directory | |
10664 | in the store, using the original layout. The | |
10665 | @code{module-import-compiled.drv} derivations compile those modules, and | |
10666 | write them in an output directory with the right layout. This | |
10667 | corresponds to the @code{#:modules} argument of | |
10668 | @code{build-expression->derivation} (@pxref{Derivations}). | |
fb729425 | 10669 | |
cf4a9129 LC |
10670 | Finally, the various tarballs are unpacked by the |
10671 | derivations @code{gcc-bootstrap-0.drv}, @code{glibc-bootstrap-0.drv}, | |
10672 | etc., at which point we have a working C tool chain. | |
fb729425 | 10673 | |
fb729425 | 10674 | |
cf4a9129 | 10675 | @unnumberedsubsec Building the Build Tools |
523e4896 | 10676 | |
cf4a9129 LC |
10677 | Bootstrapping is complete when we have a full tool chain that does not |
10678 | depend on the pre-built bootstrap tools discussed above. This | |
10679 | no-dependency requirement is verified by checking whether the files of | |
10680 | the final tool chain contain references to the @file{/gnu/store} | |
10681 | directories of the bootstrap inputs. The process that leads to this | |
10682 | ``final'' tool chain is described by the package definitions found in | |
1f6f57df | 10683 | the @code{(gnu packages commencement)} module. |
df2ce343 | 10684 | |
d33fa0c7 LC |
10685 | The @command{guix graph} command allows us to ``zoom out'' compared to |
10686 | the graph above, by looking at the level of package objects instead of | |
10687 | individual derivations---remember that a package may translate to | |
10688 | several derivations, typically one derivation to download its source, | |
10689 | one to build the Guile modules it needs, and one to actually build the | |
10690 | package from source. The command: | |
10691 | ||
10692 | @example | |
10693 | guix graph -t bag \ | |
10694 | -e '(@@@@ (gnu packages commencement) | |
10695 | glibc-final-with-bootstrap-bash)' | dot -Tps > t.ps | |
10696 | @end example | |
10697 | ||
10698 | @noindent | |
10699 | produces the dependency graph leading to the ``final'' C | |
10700 | library@footnote{You may notice the @code{glibc-intermediate} label, | |
10701 | suggesting that it is not @emph{quite} final, but as a good | |
10702 | approximation, we will consider it final.}, depicted below. | |
10703 | ||
10704 | @image{images/bootstrap-packages,6in,,Dependency graph of the early packages} | |
10705 | ||
cf4a9129 LC |
10706 | @c See <http://lists.gnu.org/archive/html/gnu-system-discuss/2012-10/msg00000.html>. |
10707 | The first tool that gets built with the bootstrap binaries is | |
d33fa0c7 LC |
10708 | GNU@tie{}Make---noted @code{make-boot0} above---which is a prerequisite |
10709 | for all the following packages. From there Findutils and Diffutils get | |
10710 | built. | |
523e4896 | 10711 | |
cf4a9129 LC |
10712 | Then come the first-stage Binutils and GCC, built as pseudo cross |
10713 | tools---i.e., with @code{--target} equal to @code{--host}. They are | |
10714 | used to build libc. Thanks to this cross-build trick, this libc is | |
10715 | guaranteed not to hold any reference to the initial tool chain. | |
4af2447e | 10716 | |
d33fa0c7 LC |
10717 | From there the final Binutils and GCC (not shown above) are built. |
10718 | GCC uses @code{ld} | |
cf4a9129 LC |
10719 | from the final Binutils, and links programs against the just-built libc. |
10720 | This tool chain is used to build the other packages used by Guix and by | |
10721 | the GNU Build System: Guile, Bash, Coreutils, etc. | |
4af2447e | 10722 | |
cf4a9129 LC |
10723 | And voilà! At this point we have the complete set of build tools that |
10724 | the GNU Build System expects. These are in the @code{%final-inputs} | |
dd164244 MW |
10725 | variable of the @code{(gnu packages commencement)} module, and are |
10726 | implicitly used by any package that uses @code{gnu-build-system} | |
1f6f57df | 10727 | (@pxref{Build Systems, @code{gnu-build-system}}). |
4af2447e | 10728 | |
4af2447e | 10729 | |
cf4a9129 | 10730 | @unnumberedsubsec Building the Bootstrap Binaries |
4af2447e | 10731 | |
cf4a9129 LC |
10732 | Because the final tool chain does not depend on the bootstrap binaries, |
10733 | those rarely need to be updated. Nevertheless, it is useful to have an | |
10734 | automated way to produce them, should an update occur, and this is what | |
10735 | the @code{(gnu packages make-bootstrap)} module provides. | |
4af2447e | 10736 | |
cf4a9129 LC |
10737 | The following command builds the tarballs containing the bootstrap |
10738 | binaries (Guile, Binutils, GCC, libc, and a tarball containing a mixture | |
10739 | of Coreutils and other basic command-line tools): | |
4b2615e1 | 10740 | |
cf4a9129 LC |
10741 | @example |
10742 | guix build bootstrap-tarballs | |
10743 | @end example | |
10744 | ||
10745 | The generated tarballs are those that should be referred to in the | |
10746 | @code{(gnu packages bootstrap)} module mentioned at the beginning of | |
10747 | this section. | |
10748 | ||
10749 | Still here? Then perhaps by now you've started to wonder: when do we | |
10750 | reach a fixed point? That is an interesting question! The answer is | |
10751 | unknown, but if you would like to investigate further (and have | |
10752 | significant computational and storage resources to do so), then let us | |
10753 | know. | |
10754 | ||
10755 | @node Porting | |
10756 | @section Porting to a New Platform | |
10757 | ||
10758 | As discussed above, the GNU distribution is self-contained, and | |
10759 | self-containment is achieved by relying on pre-built ``bootstrap | |
10760 | binaries'' (@pxref{Bootstrapping}). These binaries are specific to an | |
10761 | operating system kernel, CPU architecture, and application binary | |
10762 | interface (ABI). Thus, to port the distribution to a platform that is | |
10763 | not yet supported, one must build those bootstrap binaries, and update | |
10764 | the @code{(gnu packages bootstrap)} module to use them on that platform. | |
10765 | ||
10766 | Fortunately, Guix can @emph{cross compile} those bootstrap binaries. | |
10767 | When everything goes well, and assuming the GNU tool chain supports the | |
10768 | target platform, this can be as simple as running a command like this | |
10769 | one: | |
10770 | ||
10771 | @example | |
10772 | guix build --target=armv5tel-linux-gnueabi bootstrap-tarballs | |
10773 | @end example | |
10774 | ||
1c0c417d LC |
10775 | For this to work, the @code{glibc-dynamic-linker} procedure in |
10776 | @code{(gnu packages bootstrap)} must be augmented to return the right | |
10777 | file name for libc's dynamic linker on that platform; likewise, | |
10778 | @code{system->linux-architecture} in @code{(gnu packages linux)} must be | |
10779 | taught about the new platform. | |
10780 | ||
cf4a9129 | 10781 | Once these are built, the @code{(gnu packages bootstrap)} module needs |
1c0c417d LC |
10782 | to be updated to refer to these binaries on the target platform. That |
10783 | is, the hashes and URLs of the bootstrap tarballs for the new platform | |
10784 | must be added alongside those of the currently supported platforms. The | |
10785 | bootstrap Guile tarball is treated specially: it is expected to be | |
10786 | available locally, and @file{gnu-system.am} has rules do download it for | |
10787 | the supported architectures; a rule for the new platform must be added | |
10788 | as well. | |
cf4a9129 LC |
10789 | |
10790 | In practice, there may be some complications. First, it may be that the | |
10791 | extended GNU triplet that specifies an ABI (like the @code{eabi} suffix | |
10792 | above) is not recognized by all the GNU tools. Typically, glibc | |
10793 | recognizes some of these, whereas GCC uses an extra @code{--with-abi} | |
10794 | configure flag (see @code{gcc.scm} for examples of how to handle this). | |
10795 | Second, some of the required packages could fail to build for that | |
10796 | platform. Lastly, the generated binaries could be broken for some | |
10797 | reason. | |
4af2447e | 10798 | |
9bf3c1a7 | 10799 | @c ********************************************************************* |
8c01b9d0 | 10800 | @include contributing.texi |
c78bd12b | 10801 | |
568717fd LC |
10802 | @c ********************************************************************* |
10803 | @node Acknowledgments | |
10804 | @chapter Acknowledgments | |
10805 | ||
136787cb LC |
10806 | Guix is based on the @uref{http://nixos.org/nix/, Nix package manager}, |
10807 | which was designed and | |
4c7ac9aa LC |
10808 | implemented by Eelco Dolstra, with contributions from other people (see |
10809 | the @file{nix/AUTHORS} file in Guix.) Nix pioneered functional package | |
568717fd LC |
10810 | management, and promoted unprecedented features, such as transactional |
10811 | package upgrades and rollbacks, per-user profiles, and referentially | |
10812 | transparent build processes. Without this work, Guix would not exist. | |
10813 | ||
10814 | The Nix-based software distributions, Nixpkgs and NixOS, have also been | |
10815 | an inspiration for Guix. | |
10816 | ||
4c7ac9aa LC |
10817 | GNU@tie{}Guix itself is a collective work with contributions from a |
10818 | number of people. See the @file{AUTHORS} file in Guix for more | |
10819 | information on these fine people. The @file{THANKS} file lists people | |
10820 | who have helped by reporting bugs, taking care of the infrastructure, | |
10821 | providing artwork and themes, making suggestions, and more---thank you! | |
10822 | ||
10823 | ||
568717fd LC |
10824 | @c ********************************************************************* |
10825 | @node GNU Free Documentation License | |
10826 | @appendix GNU Free Documentation License | |
10827 | ||
10828 | @include fdl-1.3.texi | |
10829 | ||
10830 | @c ********************************************************************* | |
10831 | @node Concept Index | |
10832 | @unnumbered Concept Index | |
10833 | @printindex cp | |
10834 | ||
a85b83d2 LC |
10835 | @node Programming Index |
10836 | @unnumbered Programming Index | |
10837 | @syncodeindex tp fn | |
10838 | @syncodeindex vr fn | |
568717fd LC |
10839 | @printindex fn |
10840 | ||
10841 | @bye | |
10842 | ||
10843 | @c Local Variables: | |
10844 | @c ispell-local-dictionary: "american"; | |
10845 | @c End: |