-;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
-;;;
-;;; This file is part of GNU Guix.
-;;;
-;;; GNU Guix is free software; you can redistribute it and/or modify it
-;;; under the terms of the GNU General Public License as published by
-;;; the Free Software Foundation; either version 3 of the License, or (at
-;;; your option) any later version.
-;;;
-;;; GNU Guix is distributed in the hope that it will be useful, but
-;;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;;; GNU General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU General Public License
-;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
-
-(define-module (gnu services base)
- #:use-module (guix store)
- #:use-module (gnu services)
- #:use-module (gnu services networking)
- #:use-module (gnu system shadow) ; 'user-account', etc.
- #:use-module (gnu system linux) ; 'pam-service', etc.
- #:use-module (gnu packages admin)
- #:use-module ((gnu packages linux)
- #:select (eudev kbd e2fsprogs lvm2 fuse alsa-utils))
- #:use-module ((gnu packages base)
- #:select (canonical-package glibc))
- #:use-module (gnu packages package-management)
- #:use-module (gnu packages lsh)
- #:use-module (gnu packages lsof)
- #:use-module ((gnu build file-systems)
- #:select (mount-flags->bit-mask))
- #:use-module (guix gexp)
- #:use-module (guix monads)
- #:use-module (guix records)
- #:use-module (srfi srfi-1)
- #:use-module (srfi srfi-26)
- #:use-module (ice-9 match)
- #:use-module (ice-9 format)
- #:export (root-file-system-service
- file-system-service
- user-unmount-service
- device-mapping-service
- swap-service
- user-processes-service
- host-name-service
- console-font-service
- udev-service
- mingetty-service
-
- %nscd-default-caches
- %nscd-default-configuration
-
- nscd-configuration
- nscd-configuration?
-
- nscd-cache
- nscd-cache?
-
- nscd-service
- syslog-service
- guix-service
- %base-services))
-
-;;; Commentary:
-;;;
-;;; Base system services---i.e., services that 99% of the users will want to
-;;; use.
-;;;
-;;; Code:
-
-(define (root-file-system-service)
- "Return a service whose sole purpose is to re-mount read-only the root file
-system upon shutdown (aka. cleanly \"umounting\" root.)
-
-This service must be the root of the service dependency graph so that its
-'stop' action is invoked when dmd is the only process left."
- (with-monad %store-monad
- (return
- (service
- (documentation "Take care of the root file system.")
- (provision '(root-file-system))
- (start #~(const #t))
- (stop #~(lambda _
- ;; Return #f if successfully stopped.
- (sync)
-
- (call-with-blocked-asyncs
- (lambda ()
- (let ((null (%make-void-port "w")))
- ;; Close 'dmd.log'.
- (display "closing log\n")
- ;; XXX: Ideally we'd use 'stop-logging', but that one
- ;; doesn't actually close the port as of dmd 0.1.
- (close-port (@@ (dmd comm) log-output-port))
- (set! (@@ (dmd comm) log-output-port) null)
-
- ;; Redirect the default output ports..
- (set-current-output-port null)
- (set-current-error-port null)
-
- ;; Close /dev/console.
- (for-each close-fdes '(0 1 2))
-
- ;; At this point, there are no open files left, so the
- ;; root file system can be re-mounted read-only.
- (mount #f "/" #f
- (logior MS_REMOUNT MS_RDONLY)
- #:update-mtab? #f)
-
- #f)))))
- (respawn? #f)))))
-
-(define* (file-system-service device target type
- #:key (flags '()) (check? #t)
- create-mount-point? options (title 'any)
- (requirements '()))
- "Return a service that mounts DEVICE on TARGET as a file system TYPE with
-OPTIONS. TITLE is a symbol specifying what kind of name DEVICE is: 'label for
-a partition label, 'device for a device file name, or 'any. When CHECK? is
-true, check the file system before mounting it. When CREATE-MOUNT-POINT? is
-true, create TARGET if it does not exist yet. FLAGS is a list of symbols,
-such as 'read-only' etc. Optionally, REQUIREMENTS may be a list of service
-names such as device-mapping services."
- (with-monad %store-monad
- (return
- (service
- (provision (list (symbol-append 'file-system- (string->symbol target))))
- (requirement `(root-file-system ,@requirements))
- (documentation "Check, mount, and unmount the given file system.")
- (start #~(lambda args
- (let ((device (canonicalize-device-spec #$device '#$title)))
- #$(if create-mount-point?
- #~(mkdir-p #$target)
- #~#t)
- #$(if check?
- #~(begin
- ;; Make sure fsck.ext2 & co. can be found.
- (setenv "PATH"
- (string-append
- #$e2fsprogs "/sbin:"
- "/run/current-system/profile/sbin:"
- (getenv "PATH")))
- (check-file-system device #$type))
- #~#t)
- (mount device #$target #$type
- #$(mount-flags->bit-mask flags)
- #$options))
- #t))
- (stop #~(lambda args
- ;; Normally there are no processes left at this point, so
- ;; TARGET can be safely unmounted.
-
- ;; Make sure PID 1 doesn't keep TARGET busy.
- (chdir "/")
-
- (umount #$target)
- #f))))))
-
-(define (user-unmount-service known-mount-points)
- "Return a service whose sole purpose is to unmount file systems not listed
-in KNOWN-MOUNT-POINTS when it is stopped."
- (with-monad %store-monad
- (return
- (service
- (documentation "Unmount manually-mounted file systems.")
- (provision '(user-unmount))
- (start #~(const #t))
- (stop #~(lambda args
- (define (known? mount-point)
- (member mount-point
- (cons* "/proc" "/sys"
- '#$known-mount-points)))
-
- ;; Make sure we don't keep the user's mount points busy.
- (chdir "/")
-
- (for-each (lambda (mount-point)
- (format #t "unmounting '~a'...~%" mount-point)
- (catch 'system-error
- (lambda ()
- (umount mount-point))
- (lambda args
- (let ((errno (system-error-errno args)))
- (format #t "failed to unmount '~a': ~a~%"
- mount-point (strerror errno))))))
- (filter (negate known?) (mount-points)))
- #f))))))
-
-(define %do-not-kill-file
- ;; Name of the file listing PIDs of processes that must survive when halting
- ;; the system. Typical example is user-space file systems.
- "/etc/dmd/do-not-kill")
-
-(define* (user-processes-service requirements #:key (grace-delay 4))
- "Return the service that is responsible for terminating all the processes so
-that the root file system can be re-mounted read-only, just before
-rebooting/halting. Processes still running GRACE-DELAY seconds after SIGTERM
-has been sent are terminated with SIGKILL.
-
-The returned service will depend on 'root-file-system' and on all the services
-listed in REQUIREMENTS.
-
-All the services that spawn processes must depend on this one so that they are
-stopped before 'kill' is called."
- (with-monad %store-monad
- (return (service
- (documentation "When stopped, terminate all user processes.")
- (provision '(user-processes))
- (requirement (cons 'root-file-system requirements))
- (start #~(const #t))
- (stop #~(lambda _
- (define (kill-except omit signal)
- ;; Kill all the processes with SIGNAL except those
- ;; listed in OMIT and the current process.
- (let ((omit (cons (getpid) omit)))
- (for-each (lambda (pid)
- (unless (memv pid omit)
- (false-if-exception
- (kill pid signal))))
- (processes))))
-
- (define omitted-pids
- ;; List of PIDs that must not be killed.
- (if (file-exists? #$%do-not-kill-file)
- (map string->number
- (call-with-input-file #$%do-not-kill-file
- (compose string-tokenize
- (@ (ice-9 rdelim) read-string))))
- '()))
-
- (define (now)
- (car (gettimeofday)))
-
- (define (sleep* n)
- ;; Really sleep N seconds.
- ;; Work around <http://bugs.gnu.org/19581>.
- (define start (now))
- (let loop ((elapsed 0))
- (when (> n elapsed)
- (sleep (- n elapsed))
- (loop (- (now) start)))))
-
- (define lset= (@ (srfi srfi-1) lset=))
-
- (display "sending all processes the TERM signal\n")
-
- (if (null? omitted-pids)
- (begin
- ;; Easy: terminate all of them.
- (kill -1 SIGTERM)
- (sleep* #$grace-delay)
- (kill -1 SIGKILL))
- (begin
- ;; Kill them all except OMITTED-PIDS. XXX: We
- ;; would like to (kill -1 SIGSTOP) to get a fixed
- ;; list of processes, like 'killall5' does, but
- ;; that seems unreliable.
- (kill-except omitted-pids SIGTERM)
- (sleep* #$grace-delay)
- (kill-except omitted-pids SIGKILL)
- (delete-file #$%do-not-kill-file)))
-
- (let wait ()
- (let ((pids (processes)))
- (unless (lset= = pids (cons 1 omitted-pids))
- (format #t "waiting for process termination\
- (processes left: ~s)~%"
- pids)
- (sleep* 2)
- (wait))))
-
- (display "all processes have been terminated\n")
- #f))
- (respawn? #f)))))
-
-(define (host-name-service name)
- "Return a service that sets the host name to @var{name}."
- (with-monad %store-monad
- (return (service
- (documentation "Initialize the machine's host name.")
- (provision '(host-name))
- (start #~(lambda _
- (sethostname #$name)))
- (respawn? #f)))))
-
-(define (unicode-start tty)
- "Return a gexp to start Unicode support on @var{tty}."
-
- ;; We have to run 'unicode_start' in a pipe so that when it invokes the
- ;; 'tty' command, that command returns TTY.
- #~(begin
- (let ((pid (primitive-fork)))
- (case pid
- ((0)
- (close-fdes 0)
- (dup2 (open-fdes #$tty O_RDONLY) 0)
- (close-fdes 1)
- (dup2 (open-fdes #$tty O_WRONLY) 1)
- (execl (string-append #$kbd "/bin/unicode_start")
- "unicode_start"))
- (else
- (zero? (cdr (waitpid pid))))))))
-
-(define* (console-font-service tty #:optional (font "LatGrkCyr-8x16"))
- "Return a service that sets up Unicode support in @var{tty} and loads
-@var{font} for that tty (fonts are per virtual console in Linux.)"
- ;; Note: 'LatGrkCyr-8x16' has the advantage of providing three common
- ;; scripts as well as glyphs for em dash, quotation marks, and other Unicode
- ;; codepoints notably found in the UTF-8 manual.
- (let ((device (string-append "/dev/" tty)))
- (with-monad %store-monad
- (return (service
- (documentation "Load a Unicode console font.")
- (provision (list (symbol-append 'console-font-
- (string->symbol tty))))
-
- ;; Start after mingetty has been started on TTY, otherwise the
- ;; settings are ignored.
- (requirement (list (symbol-append 'term-
- (string->symbol tty))))
-
- (start #~(lambda _
- (and #$(unicode-start device)
- (zero?
- (system* (string-append #$kbd "/bin/setfont")
- "-C" #$device #$font)))))
- (stop #~(const #t))
- (respawn? #f))))))
-
-(define* (mingetty-service tty
- #:key
- (motd (text-file "motd" "Welcome.\n"))
- auto-login
- login-program
- login-pause?
-
- ;; Allow empty passwords by default so that
- ;; first-time users can log in when the 'root'
- ;; account has just been created.
- (allow-empty-passwords? #t))
- "Return a service to run mingetty on @var{tty}.
-
-When @var{allow-empty-passwords?} is true, allow empty log-in password. When
-@var{auto-login} is true, it must be a user name under which to log-in
-automatically. @var{login-pause?} can be set to @code{#t} in conjunction with
-@var{auto-login}, in which case the user will have to press a key before the
-login shell is launched.
-
-When true, @var{login-program} is a gexp or a monadic gexp denoting the name
-of the log-in program (the default is the @code{login} program from the Shadow
-tool suite.)
-
-@var{motd} is a monadic value containing a text file to use as
-the ``message of the day''."
- (mlet %store-monad ((motd motd)
- (login-program (cond ((gexp? login-program)
- (return login-program))
- ((not login-program)
- (return #f))
- (else
- login-program))))
- (return
- (service
- (documentation (string-append "Run mingetty on " tty "."))
- (provision (list (symbol-append 'term- (string->symbol tty))))
-
- ;; Since the login prompt shows the host name, wait for the 'host-name'
- ;; service to be done. Also wait for udev essentially so that the tty
- ;; text is not lost in the middle of kernel messages (XXX).
- (requirement '(user-processes host-name udev))
-
- (start #~(make-forkexec-constructor
- (list (string-append #$mingetty "/sbin/mingetty")
- "--noclear" #$tty
- #$@(if auto-login
- #~("--autologin" #$auto-login)
- #~())
- #$@(if login-program
- #~("--loginprog" #$login-program)
- #~())
- #$@(if login-pause?
- #~("--loginpause")
- #~()))))
- (stop #~(make-kill-destructor))
-
- (pam-services
- ;; Let 'login' be known to PAM. All the mingetty services will have
- ;; that PAM service, but that's fine because they're all identical and
- ;; duplicates are removed.
- (list (unix-pam-service "login"
- #:allow-empty-passwords? allow-empty-passwords?
- #:motd motd)))))))
-
-(define-record-type* <nscd-configuration> nscd-configuration
- make-nscd-configuration
- nscd-configuration?
- (log-file nscd-configuration-log-file ;string
- (default "/var/log/nscd.log"))
- (debug-level nscd-debug-level ;integer
- (default 0))
- ;; TODO: See nscd.conf in glibc for other options to add.
- (caches nscd-configuration-caches ;list of <nscd-cache>
- (default %nscd-default-caches)))
-
-(define-record-type* <nscd-cache> nscd-cache make-nscd-cache
- nscd-cache?
- (database nscd-cache-database) ;symbol
- (positive-time-to-live nscd-cache-positive-time-to-live) ;integer
- (negative-time-to-live nscd-cache-negative-time-to-live
- (default 20)) ;integer
- (suggested-size nscd-cache-suggested-size ;integer ("default module
- ;of hash table")
- (default 211))
- (check-files? nscd-cache-check-files? ;Boolean
- (default #t))
- (persistent? nscd-cache-persistent? ;Boolean
- (default #t))
- (shared? nscd-cache-shared? ;Boolean
- (default #t))
- (max-database-size nscd-cache-max-database-size ;integer
- (default (* 32 (expt 2 20))))
- (auto-propagate? nscd-cache-auto-propagate? ;Boolean
- (default #t)))
-
-(define %nscd-default-caches
- ;; Caches that we want to enable by default. Note that when providing an
- ;; empty nscd.conf, all caches are disabled.
- (list (nscd-cache (database 'hosts)
-
- ;; Aggressively cache the host name cache to improve
- ;; privacy and resilience.
- (positive-time-to-live (* 3600 12))
- (negative-time-to-live 20)
- (persistent? #t))
-
- (nscd-cache (database 'services)
-
- ;; Services are unlikely to change, so we can be even more
- ;; aggressive.
- (positive-time-to-live (* 3600 24))
- (negative-time-to-live 3600)
- (check-files? #t) ;check /etc/services changes
- (persistent? #t))))
-
-(define %nscd-default-configuration
- ;; Default nscd configuration.
- (nscd-configuration))
-
-(define (nscd.conf-file config)
- "Return the @file{nscd.conf} configuration file for @var{config}, an
-@code{<nscd-configuration>} object."
- (define cache->config
- (match-lambda
- (($ <nscd-cache> (= symbol->string database)
- positive-ttl negative-ttl size check-files?
- persistent? shared? max-size propagate?)
- (string-append "\nenable-cache\t" database "\tyes\n"
-
- "positive-time-to-live\t" database "\t"
- (number->string positive-ttl) "\n"
- "negative-time-to-live\t" database "\t"
- (number->string negative-ttl) "\n"
- "suggested-size\t" database "\t"
- (number->string size) "\n"
- "check-files\t" database "\t"
- (if check-files? "yes\n" "no\n")
- "persistent\t" database "\t"
- (if persistent? "yes\n" "no\n")
- "shared\t" database "\t"
- (if shared? "yes\n" "no\n")
- "max-db-size\t" database "\t"
- (number->string max-size) "\n"
- "auto-propagate\t" database "\t"
- (if propagate? "yes\n" "no\n")))))
-
- (match config
- (($ <nscd-configuration> log-file debug-level caches)
- (text-file "nscd.conf"
- (string-append "\
-# Configuration of libc's name service cache daemon (nscd).\n\n"
- (if log-file
- (string-append "logfile\t" log-file)
- "")
- "\n"
- (if debug-level
- (string-append "debug-level\t"
- (number->string debug-level))
- "")
- "\n"
- (string-concatenate
- (map cache->config caches)))))))
-
-(define* (nscd-service #:optional (config %nscd-default-configuration)
- #:key (glibc (canonical-package glibc))
- (name-services '()))
- "Return a service that runs libc's name service cache daemon (nscd) with the
-given @var{config}---an @code{<nscd-configuration>} object. Optionally,
-@code{#:name-services} is a list of packages that provide name service switch
- (NSS) modules needed by nscd."
- (mlet %store-monad ((nscd.conf (nscd.conf-file config)))
- (return (service
- (documentation "Run libc's name service cache daemon (nscd).")
- (provision '(nscd))
- (requirement '(user-processes))
-
- (activate #~(begin
- (use-modules (guix build utils))
- (mkdir-p "/var/run/nscd")
- (mkdir-p "/var/db/nscd"))) ;for the persistent cache
-
- (start #~(make-forkexec-constructor
- (list (string-append #$glibc "/sbin/nscd")
- "-f" #$nscd.conf "--foreground")
-
- #:environment-variables
- (list (string-append "LD_LIBRARY_PATH="
- (string-join
- (map (lambda (dir)
- (string-append dir "/lib"))
- (list #$@name-services))
- ":")))))
- (stop #~(make-kill-destructor))
-
- (respawn? #f)))))
-
-(define* (syslog-service #:key config-file)
- "Return a service that runs @code{syslogd}.
-If configuration file name @var{config-file} is not specified, use some
-reasonable default settings."
-
- ;; Snippet adapted from the GNU inetutils manual.
- (define contents "
- # Log all error messages, authentication messages of
- # level notice or higher and anything of level err or
- # higher to the console.
- # Don't log private authentication messages!
- *.alert;auth.notice;authpriv.none /dev/console
-
- # Log anything (except mail) of level info or higher.
- # Don't log private authentication messages!
- *.info;mail.none;authpriv.none /var/log/messages
-
- # Same, in a different place.
- *.info;mail.none;authpriv.none /dev/tty12
-
- # The authpriv file has restricted access.
- authpriv.* /var/log/secure
-
- # Log all the mail messages in one place.
- mail.* /var/log/maillog
-")
-
- (mlet %store-monad
- ((syslog.conf (text-file "syslog.conf" contents)))
- (return
- (service
- (documentation "Run the syslog daemon (syslogd).")
- (provision '(syslogd))
- (requirement '(user-processes))
- (start
- #~(make-forkexec-constructor
- (list (string-append #$inetutils "/libexec/syslogd")
- "--no-detach" "--rcfile" #$(or config-file syslog.conf))))
- (stop #~(make-kill-destructor))))))
-
-(define* (guix-build-accounts count #:key
- (group "guixbuild")
- (first-uid 30001)
- (shadow shadow))
- "Return a list of COUNT user accounts for Guix build users, with UIDs
-starting at FIRST-UID, and under GID."
- (unfold (cut > <> count)
- (lambda (n)
- (user-account
- (name (format #f "guixbuilder~2,'0d" n))
- (system? #t)
- (uid (+ first-uid n -1))
- (group group)
-
- ;; guix-daemon expects GROUP to be listed as a
- ;; supplementary group too:
- ;; <http://lists.gnu.org/archive/html/bug-guix/2013-01/msg00239.html>.
- (supplementary-groups (list group "kvm"))
-
- (comment (format #f "Guix Build User ~2d" n))
- (home-directory "/var/empty")
- (shell #~(string-append #$shadow "/sbin/nologin"))))
- 1+
- 1))
-
-(define (hydra-key-authorization guix)
- "Return a gexp with code to register the hydra.gnu.org public key with
-GUIX."
- #~(unless (file-exists? "/etc/guix/acl")
- (let ((pid (primitive-fork)))
- (case pid
- ((0)
- (let* ((key (string-append #$guix
- "/share/guix/hydra.gnu.org.pub"))
- (port (open-file key "r0b")))
- (format #t "registering public key '~a'...~%" key)
- (close-port (current-input-port))
- (dup port 0)
- (execl (string-append #$guix "/bin/guix")
- "guix" "archive" "--authorize")
- (exit 1)))
- (else
- (let ((status (cdr (waitpid pid))))
- (unless (zero? status)
- (format (current-error-port) "warning: \
-failed to register hydra.gnu.org public key: ~a~%" status))))))))
-
-(define* (guix-service #:key (guix guix) (builder-group "guixbuild")
- (build-accounts 10) (authorize-hydra-key? #t)
- (use-substitutes? #t)
- (extra-options '())
- (lsof lsof) (lsh lsh))
- "Return a service that runs the build daemon from @var{guix}, and has
-@var{build-accounts} user accounts available under @var{builder-group}.
-
-When @var{authorize-hydra-key?} is true, the @code{hydra.gnu.org} public key
-provided by @var{guix} is authorized upon activation, meaning that substitutes
-from @code{hydra.gnu.org} are used by default.
-
-If @var{use-substitutes?} is false, the daemon is run with
-@option{--no-substitutes} (@pxref{Invoking guix-daemon,
-@option{--no-substitutes}}).
-
-Finally, @var{extra-options} is a list of additional command-line options
-passed to @command{guix-daemon}."
- (define activate
- ;; Assume that the store has BUILDER-GROUP as its group. We could
- ;; otherwise call 'chown' here, but the problem is that on a COW unionfs,
- ;; chown leads to an entire copy of the tree, which is a bad idea.
-
- ;; Optionally authorize hydra.gnu.org's key.
- (and authorize-hydra-key?
- (hydra-key-authorization guix)))
-
- (with-monad %store-monad
- (return (service
- (documentation "Run the Guix daemon.")
- (provision '(guix-daemon))
- (requirement '(user-processes))
- (start
- #~(make-forkexec-constructor
- (list (string-append #$guix "/bin/guix-daemon")
- "--build-users-group" #$builder-group
- #$@(if use-substitutes?
- '()
- '("--no-substitutes"))
- #$@extra-options)
-
- ;; Add 'lsof' (for the GC) and 'lsh' (for offloading) to the
- ;; daemon's $PATH.
- #:environment-variables
- (list (string-append "PATH=" #$lsof "/bin:"
- #$lsh "/bin"))))
- (stop #~(make-kill-destructor))
- (user-accounts (guix-build-accounts build-accounts
- #:group builder-group))
- (user-groups (list (user-group
- (name builder-group)
- (system? #t)
-
- ;; Use a fixed GID so that we can create the
- ;; store with the right owner.
- (id 30000))))
- (activate activate)))))
-
-(define (udev-rules-union packages)
- "Return the union of the @code{lib/udev/rules.d} directories found in each
-item of @var{packages}."
- (define build
- #~(begin
- (use-modules (guix build union)
- (guix build utils)
- (srfi srfi-1)
- (srfi srfi-26))
-
- (define %standard-locations
- '("/lib/udev/rules.d" "/libexec/udev/rules.d"))
-
- (define (rules-sub-directory directory)
- ;; Return the sub-directory of DIRECTORY containing udev rules, or
- ;; #f if none was found.
- (find directory-exists?
- (map (cut string-append directory <>) %standard-locations)))
-
- (mkdir-p (string-append #$output "/lib/udev"))
- (union-build (string-append #$output "/lib/udev/rules.d")
- (filter-map rules-sub-directory '#$packages))))
-
- (gexp->derivation "udev-rules" build
- #:modules '((guix build union)
- (guix build utils))
- #:local-build? #t))
-
-(define* (kvm-udev-rule)
- "Return a directory with a udev rule that changes the group of
-@file{/dev/kvm} to \"kvm\" and makes it #o660."
- ;; Apparently QEMU-KVM used to ship this rule, but now we have to add it by
- ;; ourselves.
- (gexp->derivation "kvm-udev-rules"
- #~(begin
- (use-modules (guix build utils))
-
- (define rules.d
- (string-append #$output "/lib/udev/rules.d"))
-
- (mkdir-p rules.d)
- (call-with-output-file
- (string-append rules.d "/90-kvm.rules")
- (lambda (port)
- ;; FIXME: As a workaround for
- ;; <http://bugs.gnu.org/18994>, make /dev/kvm 666
- ;; instead of 660.
- (display "\
-KERNEL==\"kvm\", GROUP=\"kvm\", MODE=\"0666\"\n" port))))
- #:modules '((guix build utils))))
-
-(define* (udev-service #:key (udev eudev) (rules '()))
- "Run @var{udev}, which populates the @file{/dev} directory dynamically. Get
-extra rules from the packages listed in @var{rules}."
- (mlet* %store-monad ((kvm (kvm-udev-rule))
- (rules (udev-rules-union (cons* udev kvm rules)))
- (udev.conf (text-file* "udev.conf"
- "udev_rules=\"" rules
- "/lib/udev/rules.d\"\n")))
- (return (service
- (provision '(udev))
-
- ;; Udev needs /dev to be a 'devtmpfs' mount so that new device
- ;; nodes can be added: see
- ;; <http://www.linuxfromscratch.org/lfs/view/development/chapter07/udev.html>.
- (requirement '(root-file-system))
-
- (documentation "Populate the /dev directory, dynamically.")
- (start #~(lambda ()
- (define find
- (@ (srfi srfi-1) find))
-
- (define udevd
- ;; Choose the right 'udevd'.
- (find file-exists?
- (map (lambda (suffix)
- (string-append #$udev suffix))
- '("/libexec/udev/udevd" ;udev
- "/sbin/udevd")))) ;eudev
-
- (define (wait-for-udevd)
- ;; Wait until someone's listening on udevd's control
- ;; socket.
- (let ((sock (socket AF_UNIX SOCK_SEQPACKET 0)))
- (let try ()
- (catch 'system-error
- (lambda ()
- (connect sock PF_UNIX "/run/udev/control")
- (close-port sock))
- (lambda args
- (format #t "waiting for udevd...~%")
- (usleep 500000)
- (try))))))
-
- ;; Allow udev to find the modules.
- (setenv "LINUX_MODULE_DIRECTORY"
- "/run/booted-system/kernel/lib/modules")
-
- ;; The first one is for udev, the second one for eudev.
- (setenv "UDEV_CONFIG_FILE" #$udev.conf)
- (setenv "EUDEV_RULES_DIRECTORY"
- (string-append #$rules "/lib/udev/rules.d"))
-
- (let ((pid (primitive-fork)))
- (case pid
- ((0)
- (exec-command (list udevd)))
- (else
- ;; Wait until udevd is up and running. This
- ;; appears to be needed so that the events
- ;; triggered below are actually handled.
- (wait-for-udevd)
-
- ;; Trigger device node creation.
- (system* (string-append #$udev "/bin/udevadm")
- "trigger" "--action=add")
-
- ;; Wait for things to settle down.
- (system* (string-append #$udev "/bin/udevadm")
- "settle")
- pid)))))
- (stop #~(make-kill-destructor))
-
- ;; When halting the system, 'udev' is actually killed by
- ;; 'user-processes', i.e., before its own 'stop' method was
- ;; called. Thus, make sure it is not respawned.
- (respawn? #f)))))
-
-(define (device-mapping-service target open close)
- "Return a service that maps device @var{target}, a string such as
-@code{\"home\"} (meaning @code{/dev/mapper/home}). Evaluate @var{open}, a
-gexp, to open it, and evaluate @var{close} to close it."
- (with-monad %store-monad
- (return (service
- (provision (list (symbol-append 'device-mapping-
- (string->symbol target))))
- (requirement '(udev))
- (documentation "Map a device node using Linux's device mapper.")
- (start #~(lambda () #$open))
- (stop #~(lambda _ (not #$close)))
- (respawn? #f)))))
-
-(define (swap-service device)
- "Return a service that uses @var{device} as a swap device."
- (define requirement
- (if (string-prefix? "/dev/mapper/" device)
- (list (symbol-append 'device-mapping-
- (string->symbol (basename device))))
- '()))
-
- (with-monad %store-monad
- (return (service
- (provision (list (symbol-append 'swap- (string->symbol device))))
- (requirement `(udev ,@requirement))
- (documentation "Enable the given swap device.")
- (start #~(lambda ()
- (swapon #$device)
- #t))
- (stop #~(lambda _
- (swapoff #$device)
- #f))
- (respawn? #f)))))
-
-(define %base-services
- ;; Convenience variable holding the basic services.
- (let ((motd (text-file "motd" "
-This is the GNU operating system, welcome!\n\n")))
- (list (console-font-service "tty1")
- (console-font-service "tty2")
- (console-font-service "tty3")
- (console-font-service "tty4")
- (console-font-service "tty5")
- (console-font-service "tty6")
-
- (mingetty-service "tty1" #:motd motd)
- (mingetty-service "tty2" #:motd motd)
- (mingetty-service "tty3" #:motd motd)
- (mingetty-service "tty4" #:motd motd)
- (mingetty-service "tty5" #:motd motd)
- (mingetty-service "tty6" #:motd motd)
- (static-networking-service "lo" "127.0.0.1"
- #:provision '(loopback))
- (syslog-service)
- (guix-service)
- (nscd-service)
-
- ;; The LVM2 rules are needed as soon as LVM2 or the device-mapper is
- ;; used, so enable them by default. The FUSE and ALSA rules are
- ;; less critical, but handy.
- (udev-service #:rules (list lvm2 fuse alsa-utils)))))
-
-;;; base.scm ends here
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2016 Alex Kost <alezost@gmail.com>
+;;; Copyright © 2015, 2016 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2015 Sou Bunnbu <iyzsong@gmail.com>
+;;; Copyright © 2016 Leo Famulari <leo@famulari.name>
+;;; Copyright © 2016 David Craven <david@craven.ch>
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu services base)
+ #:use-module (guix store)
+ #:use-module (gnu services)
+ #:use-module (gnu services shepherd)
+ #:use-module (gnu services networking)
+ #:use-module (gnu system pam)
+ #:use-module (gnu system shadow) ; 'user-account', etc.
+ #:use-module (gnu system file-systems) ; 'file-system', etc.
+ #:use-module (gnu system mapped-devices)
+ #:use-module (gnu packages admin)
+ #:use-module ((gnu packages linux)
+ #:select (alsa-utils crda eudev e2fsprogs fuse gpm kbd lvm2 rng-tools))
+ #:use-module ((gnu packages base)
+ #:select (canonical-package glibc))
+ #:use-module (gnu packages package-management)
+ #:use-module (gnu packages ssh)
+ #:use-module (gnu packages lsof)
+ #:use-module (gnu packages terminals)
+ #:use-module ((gnu build file-systems)
+ #:select (mount-flags->bit-mask))
+ #:use-module (guix gexp)
+ #:use-module (guix records)
+ #:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-26)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 format)
+ #:export (fstab-service-type
+ root-file-system-service
+ file-system-service-type
+ user-unmount-service
+ swap-service
+ user-processes-service
+ session-environment-service
+ session-environment-service-type
+ host-name-service
+ console-keymap-service
+ %default-console-font
+ console-font-service-type
+ console-font-service
+
+ udev-configuration
+ udev-configuration?
+ udev-configuration-rules
+ udev-service-type
+ udev-service
+ udev-rule
+
+ login-configuration
+ login-configuration?
+ login-service-type
+ login-service
+
+ mingetty-configuration
+ mingetty-configuration?
+ mingetty-service
+ mingetty-service-type
+
+ %nscd-default-caches
+ %nscd-default-configuration
+
+ nscd-configuration
+ nscd-configuration?
+
+ nscd-cache
+ nscd-cache?
+
+ nscd-service-type
+ nscd-service
+
+ syslog-configuration
+ syslog-configuration?
+ syslog-service
+ syslog-service-type
+ %default-syslog.conf
+
+ %default-authorized-guix-keys
+ guix-configuration
+ guix-configuration?
+ guix-service
+ guix-service-type
+ guix-publish-configuration
+ guix-publish-configuration?
+ guix-publish-service
+ guix-publish-service-type
+
+ gpm-configuration
+ gpm-configuration?
+ gpm-service-type
+ gpm-service
+
+ urandom-seed-service-type
+ urandom-seed-service
+
+ rngd-configuration
+ rngd-configuration?
+ rngd-service-type
+ rngd-service
+
+ kmscon-configuration
+ kmscon-configuration?
+ kmscon-service-type
+
+ pam-limits-service-type
+ pam-limits-service
+
+ %base-services))
+
+;;; Commentary:
+;;;
+;;; Base system services---i.e., services that 99% of the users will want to
+;;; use.
+;;;
+;;; Code:
+
+\f
+;;;
+;;; File systems.
+;;;
+
+(define (file-system->fstab-entry file-system)
+ "Return a @file{/etc/fstab} entry for @var{file-system}."
+ (string-append (case (file-system-title file-system)
+ ((label)
+ (string-append "LABEL=" (file-system-device file-system)))
+ ((uuid)
+ (string-append
+ "UUID="
+ (uuid->string (file-system-device file-system))))
+ (else
+ (file-system-device file-system)))
+ "\t"
+ (file-system-mount-point file-system) "\t"
+ (file-system-type file-system) "\t"
+ (or (file-system-options file-system) "defaults") "\t"
+
+ ;; XXX: Omit the 'fs_freq' and 'fs_passno' fields because we
+ ;; don't have anything sensible to put in there.
+ ))
+
+(define (file-systems->fstab file-systems)
+ "Return a @file{/etc} entry for an @file{fstab} describing
+@var{file-systems}."
+ `(("fstab" ,(plain-file "fstab"
+ (string-append
+ "\
+# This file was generated from your GuixSD configuration. Any changes
+# will be lost upon reboot or reconfiguration.\n\n"
+ (string-join (map file-system->fstab-entry
+ file-systems)
+ "\n")
+ "\n")))))
+
+(define fstab-service-type
+ ;; The /etc/fstab service.
+ (service-type (name 'fstab)
+ (extensions
+ (list (service-extension etc-service-type
+ file-systems->fstab)))
+ (compose concatenate)
+ (extend append)))
+
+(define %root-file-system-shepherd-service
+ (shepherd-service
+ (documentation "Take care of the root file system.")
+ (provision '(root-file-system))
+ (start #~(const #t))
+ (stop #~(lambda _
+ ;; Return #f if successfully stopped.
+ (sync)
+
+ (call-with-blocked-asyncs
+ (lambda ()
+ (let ((null (%make-void-port "w")))
+ ;; Close 'shepherd.log'.
+ (display "closing log\n")
+ ((@ (shepherd comm) stop-logging))
+
+ ;; Redirect the default output ports..
+ (set-current-output-port null)
+ (set-current-error-port null)
+
+ ;; Close /dev/console.
+ (for-each close-fdes '(0 1 2))
+
+ ;; At this point, there are no open files left, so the
+ ;; root file system can be re-mounted read-only.
+ (mount #f "/" #f
+ (logior MS_REMOUNT MS_RDONLY)
+ #:update-mtab? #f)
+
+ #f)))))
+ (respawn? #f)))
+
+(define root-file-system-service-type
+ (shepherd-service-type 'root-file-system
+ (const %root-file-system-shepherd-service)))
+
+(define (root-file-system-service)
+ "Return a service whose sole purpose is to re-mount read-only the root file
+system upon shutdown (aka. cleanly \"umounting\" root.)
+
+This service must be the root of the service dependency graph so that its
+'stop' action is invoked when shepherd is the only process left."
+ (service root-file-system-service-type #f))
+
+(define (file-system->shepherd-service-name file-system)
+ "Return the symbol that denotes the service mounting and unmounting
+FILE-SYSTEM."
+ (symbol-append 'file-system-
+ (string->symbol (file-system-mount-point file-system))))
+
+(define (mapped-device->shepherd-service-name md)
+ "Return the symbol that denotes the shepherd service of MD, a <mapped-device>."
+ (symbol-append 'device-mapping-
+ (string->symbol (mapped-device-target md))))
+
+(define dependency->shepherd-service-name
+ (match-lambda
+ ((? mapped-device? md)
+ (mapped-device->shepherd-service-name md))
+ ((? file-system? fs)
+ (file-system->shepherd-service-name fs))))
+
+(define (file-system-shepherd-service file-system)
+ "Return the shepherd service for @var{file-system}, or @code{#f} if
+@var{file-system} is not auto-mounted upon boot."
+ (let ((target (file-system-mount-point file-system))
+ (device (file-system-device file-system))
+ (type (file-system-type file-system))
+ (title (file-system-title file-system))
+ (check? (file-system-check? file-system))
+ (create? (file-system-create-mount-point? file-system))
+ (dependencies (file-system-dependencies file-system)))
+ (and (file-system-mount? file-system)
+ (with-imported-modules '((gnu build file-systems)
+ (guix build bournish))
+ (shepherd-service
+ (provision (list (file-system->shepherd-service-name file-system)))
+ (requirement `(root-file-system
+ ,@(map dependency->shepherd-service-name dependencies)))
+ (documentation "Check, mount, and unmount the given file system.")
+ (start #~(lambda args
+ ;; FIXME: Use or factorize with 'mount-file-system'.
+ (let ((device (canonicalize-device-spec #$device '#$title))
+ (flags #$(mount-flags->bit-mask
+ (file-system-flags file-system))))
+ #$(if create?
+ #~(mkdir-p #$target)
+ #~#t)
+ #$(if check?
+ #~(begin
+ ;; Make sure fsck.ext2 & co. can be found.
+ (setenv "PATH"
+ (string-append
+ #$e2fsprogs "/sbin:"
+ "/run/current-system/profile/sbin:"
+ (getenv "PATH")))
+ (check-file-system device #$type))
+ #~#t)
+
+ (mount device #$target #$type flags
+ #$(file-system-options file-system))
+
+ ;; For read-only bind mounts, an extra remount is
+ ;; needed, as per <http://lwn.net/Articles/281157/>,
+ ;; which still applies to Linux 4.0.
+ (when (and (= MS_BIND (logand flags MS_BIND))
+ (= MS_RDONLY (logand flags MS_RDONLY)))
+ (mount device #$target #$type
+ (logior MS_BIND MS_REMOUNT MS_RDONLY))))
+ #t))
+ (stop #~(lambda args
+ ;; Normally there are no processes left at this point, so
+ ;; TARGET can be safely unmounted.
+
+ ;; Make sure PID 1 doesn't keep TARGET busy.
+ (chdir "/")
+
+ (umount #$target)
+ #f))
+
+ ;; We need an additional module.
+ (modules `(((gnu build file-systems)
+ #:select (check-file-system canonicalize-device-spec))
+ ,@%default-modules)))))))
+
+(define file-system-service-type
+ (service-type (name 'file-systems)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ (lambda (file-systems)
+ (filter-map file-system-shepherd-service
+ file-systems)))
+ (service-extension fstab-service-type
+ identity)))
+ (compose concatenate)
+ (extend append)))
+
+(define user-unmount-service-type
+ (shepherd-service-type
+ 'user-file-systems
+ (lambda (known-mount-points)
+ (shepherd-service
+ (documentation "Unmount manually-mounted file systems.")
+ (provision '(user-file-systems))
+ (start #~(const #t))
+ (stop #~(lambda args
+ (define (known? mount-point)
+ (member mount-point
+ (cons* "/proc" "/sys" '#$known-mount-points)))
+
+ ;; Make sure we don't keep the user's mount points busy.
+ (chdir "/")
+
+ (for-each (lambda (mount-point)
+ (format #t "unmounting '~a'...~%" mount-point)
+ (catch 'system-error
+ (lambda ()
+ (umount mount-point))
+ (lambda args
+ (let ((errno (system-error-errno args)))
+ (format #t "failed to unmount '~a': ~a~%"
+ mount-point (strerror errno))))))
+ (filter (negate known?) (mount-points)))
+ #f))))))
+
+(define (user-unmount-service known-mount-points)
+ "Return a service whose sole purpose is to unmount file systems not listed
+in KNOWN-MOUNT-POINTS when it is stopped."
+ (service user-unmount-service-type known-mount-points))
+
+(define %do-not-kill-file
+ ;; Name of the file listing PIDs of processes that must survive when halting
+ ;; the system. Typical example is user-space file systems.
+ "/etc/shepherd/do-not-kill")
+
+(define user-processes-service-type
+ (shepherd-service-type
+ 'user-processes
+ (match-lambda
+ ((requirements grace-delay)
+ (shepherd-service
+ (documentation "When stopped, terminate all user processes.")
+ (provision '(user-processes))
+ (requirement (cons* 'root-file-system 'user-file-systems
+ (map file-system->shepherd-service-name
+ requirements)))
+ (start #~(const #t))
+ (stop #~(lambda _
+ (define (kill-except omit signal)
+ ;; Kill all the processes with SIGNAL except those listed
+ ;; in OMIT and the current process.
+ (let ((omit (cons (getpid) omit)))
+ (for-each (lambda (pid)
+ (unless (memv pid omit)
+ (false-if-exception
+ (kill pid signal))))
+ (processes))))
+
+ (define omitted-pids
+ ;; List of PIDs that must not be killed.
+ (if (file-exists? #$%do-not-kill-file)
+ (map string->number
+ (call-with-input-file #$%do-not-kill-file
+ (compose string-tokenize
+ (@ (ice-9 rdelim) read-string))))
+ '()))
+
+ (define (now)
+ (car (gettimeofday)))
+
+ (define (sleep* n)
+ ;; Really sleep N seconds.
+ ;; Work around <http://bugs.gnu.org/19581>.
+ (define start (now))
+ (let loop ((elapsed 0))
+ (when (> n elapsed)
+ (sleep (- n elapsed))
+ (loop (- (now) start)))))
+
+ (define lset= (@ (srfi srfi-1) lset=))
+
+ (display "sending all processes the TERM signal\n")
+
+ (if (null? omitted-pids)
+ (begin
+ ;; Easy: terminate all of them.
+ (kill -1 SIGTERM)
+ (sleep* #$grace-delay)
+ (kill -1 SIGKILL))
+ (begin
+ ;; Kill them all except OMITTED-PIDS. XXX: We would
+ ;; like to (kill -1 SIGSTOP) to get a fixed list of
+ ;; processes, like 'killall5' does, but that seems
+ ;; unreliable.
+ (kill-except omitted-pids SIGTERM)
+ (sleep* #$grace-delay)
+ (kill-except omitted-pids SIGKILL)
+ (delete-file #$%do-not-kill-file)))
+
+ (let wait ()
+ (let ((pids (processes)))
+ (unless (lset= = pids (cons 1 omitted-pids))
+ (format #t "waiting for process termination\
+ (processes left: ~s)~%"
+ pids)
+ (sleep* 2)
+ (wait))))
+
+ (display "all processes have been terminated\n")
+ #f))
+ (respawn? #f))))))
+
+(define* (user-processes-service file-systems #:key (grace-delay 4))
+ "Return the service that is responsible for terminating all the processes so
+that the root file system can be re-mounted read-only, just before
+rebooting/halting. Processes still running GRACE-DELAY seconds after SIGTERM
+has been sent are terminated with SIGKILL.
+
+The returned service will depend on 'root-file-system' and on all the shepherd
+services corresponding to FILE-SYSTEMS.
+
+All the services that spawn processes must depend on this one so that they are
+stopped before 'kill' is called."
+ (service user-processes-service-type
+ (list (filter file-system-mount? file-systems) grace-delay)))
+
+\f
+;;;
+;;; Preserve entropy to seed /dev/urandom on boot.
+;;;
+
+(define %random-seed-file
+ "/var/lib/random-seed")
+
+(define (urandom-seed-shepherd-service _)
+ "Return a shepherd service for the /dev/urandom seed."
+ (list (shepherd-service
+ (documentation "Preserve entropy across reboots for /dev/urandom.")
+ (provision '(urandom-seed))
+ (requirement '(user-processes))
+ (start #~(lambda _
+ ;; On boot, write random seed into /dev/urandom.
+ (when (file-exists? #$%random-seed-file)
+ (call-with-input-file #$%random-seed-file
+ (lambda (seed)
+ (call-with-output-file "/dev/urandom"
+ (lambda (urandom)
+ (dump-port seed urandom))))))
+ ;; Immediately refresh the seed in case the system doesn't
+ ;; shut down cleanly.
+ (call-with-input-file "/dev/urandom"
+ (lambda (urandom)
+ (let ((previous-umask (umask #o077))
+ (buf (make-bytevector 512)))
+ (mkdir-p (dirname #$%random-seed-file))
+ (get-bytevector-n! urandom buf 0 512)
+ (call-with-output-file #$%random-seed-file
+ (lambda (seed)
+ (put-bytevector seed buf)))
+ (umask previous-umask))))
+ #t))
+ (stop #~(lambda _
+ ;; During shutdown, write from /dev/urandom into random seed.
+ (let ((buf (make-bytevector 512)))
+ (call-with-input-file "/dev/urandom"
+ (lambda (urandom)
+ (let ((previous-umask (umask #o077)))
+ (get-bytevector-n! urandom buf 0 512)
+ (mkdir-p (dirname #$%random-seed-file))
+ (call-with-output-file #$%random-seed-file
+ (lambda (seed)
+ (put-bytevector seed buf)))
+ (umask previous-umask))
+ #t)))))
+ (modules `((rnrs bytevectors)
+ (rnrs io ports)
+ ,@%default-modules)))))
+
+(define urandom-seed-service-type
+ (service-type (name 'urandom-seed)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ urandom-seed-shepherd-service)))))
+
+(define (urandom-seed-service)
+ (service urandom-seed-service-type #f))
+
+
+;;;
+;;; Add hardware random number generator to entropy pool.
+;;;
+
+(define-record-type* <rngd-configuration>
+ rngd-configuration make-rngd-configuration
+ rngd-configuration?
+ (rng-tools rngd-configuration-rng-tools) ;package
+ (device rngd-configuration-device)) ;string
+
+(define rngd-service-type
+ (shepherd-service-type
+ 'rngd
+ (lambda (config)
+ (define rng-tools (rngd-configuration-rng-tools config))
+ (define device (rngd-configuration-device config))
+
+ (define rngd-command
+ (list (file-append rng-tools "/sbin/rngd")
+ "-f" "-r" device))
+
+ (shepherd-service
+ (documentation "Add TRNG to entropy pool.")
+ (requirement '(udev))
+ (provision '(trng))
+ (start #~(make-forkexec-constructor #$@rngd-command))
+ (stop #~(make-kill-destructor))))))
+
+(define* (rngd-service #:key
+ (rng-tools rng-tools)
+ (device "/dev/hwrng"))
+ "Return a service that runs the @command{rngd} program from @var{rng-tools}
+to add @var{device} to the kernel's entropy pool. The service will fail if
+@var{device} does not exist."
+ (service rngd-service-type
+ (rngd-configuration
+ (rng-tools rng-tools)
+ (device device))))
+
+
+;;;
+;;; System-wide environment variables.
+;;;
+
+(define (environment-variables->environment-file vars)
+ "Return a file for pam_env(8) that contains environment variables VARS."
+ (apply mixed-text-file "environment"
+ (append-map (match-lambda
+ ((key . value)
+ (list key "=" value "\n")))
+ vars)))
+
+(define session-environment-service-type
+ (service-type
+ (name 'session-environment)
+ (extensions
+ (list (service-extension
+ etc-service-type
+ (lambda (vars)
+ (list `("environment"
+ ,(environment-variables->environment-file vars)))))))
+ (compose concatenate)
+ (extend append)))
+
+(define (session-environment-service vars)
+ "Return a service that builds the @file{/etc/environment}, which can be read
+by PAM-aware applications to set environment variables for sessions.
+
+VARS should be an association list in which both the keys and the values are
+strings or string-valued gexps."
+ (service session-environment-service-type vars))
+
+\f
+;;;
+;;; Console & co.
+;;;
+
+(define host-name-service-type
+ (shepherd-service-type
+ 'host-name
+ (lambda (name)
+ (shepherd-service
+ (documentation "Initialize the machine's host name.")
+ (provision '(host-name))
+ (start #~(lambda _
+ (sethostname #$name)))
+ (respawn? #f)))))
+
+(define (host-name-service name)
+ "Return a service that sets the host name to @var{name}."
+ (service host-name-service-type name))
+
+(define (unicode-start tty)
+ "Return a gexp to start Unicode support on @var{tty}."
+
+ ;; We have to run 'unicode_start' in a pipe so that when it invokes the
+ ;; 'tty' command, that command returns TTY.
+ #~(begin
+ (let ((pid (primitive-fork)))
+ (case pid
+ ((0)
+ (close-fdes 0)
+ (dup2 (open-fdes #$tty O_RDONLY) 0)
+ (close-fdes 1)
+ (dup2 (open-fdes #$tty O_WRONLY) 1)
+ (execl (string-append #$kbd "/bin/unicode_start")
+ "unicode_start"))
+ (else
+ (zero? (cdr (waitpid pid))))))))
+
+(define console-keymap-service-type
+ (shepherd-service-type
+ 'console-keymap
+ (lambda (files)
+ (shepherd-service
+ (documentation (string-append "Load console keymap (loadkeys)."))
+ (provision '(console-keymap))
+ (start #~(lambda _
+ (zero? (system* (string-append #$kbd "/bin/loadkeys")
+ #$@files))))
+ (respawn? #f)))))
+
+(define (console-keymap-service . files)
+ "Return a service to load console keymaps from @var{files}."
+ (service console-keymap-service-type files))
+
+(define %default-console-font
+ ;; Note: 'LatGrkCyr-8x16' has the advantage of providing three common
+ ;; scripts as well as glyphs for em dash, quotation marks, and other Unicode
+ ;; codepoints notably found in the UTF-8 manual.
+ "LatGrkCyr-8x16")
+
+(define (console-font-shepherd-services tty+font)
+ "Return a list of Shepherd services for each pair in TTY+FONT."
+ (map (match-lambda
+ ((tty . font)
+ (let ((device (string-append "/dev/" tty)))
+ (shepherd-service
+ (documentation "Load a Unicode console font.")
+ (provision (list (symbol-append 'console-font-
+ (string->symbol tty))))
+
+ ;; Start after mingetty has been started on TTY, otherwise the settings
+ ;; are ignored.
+ (requirement (list (symbol-append 'term-
+ (string->symbol tty))))
+
+ (start #~(lambda _
+ (and #$(unicode-start device)
+ (zero?
+ (system* (string-append #$kbd "/bin/setfont")
+ "-C" #$device #$font)))))
+ (stop #~(const #t))
+ (respawn? #f)))))
+ tty+font))
+
+(define console-font-service-type
+ (service-type (name 'console-fonts)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ console-font-shepherd-services)))
+ (compose concatenate)
+ (extend append)))
+
+(define* (console-font-service tty #:optional (font "LatGrkCyr-8x16"))
+ "This procedure is deprecated in favor of @code{console-font-service-type}.
+
+Return a service that sets up Unicode support in @var{tty} and loads
+@var{font} for that tty (fonts are per virtual console in Linux.)"
+ (simple-service (symbol-append 'console-font- (string->symbol tty))
+ console-font-service-type `((,tty . ,font))))
+
+(define %default-motd
+ (plain-file "motd" "This is the GNU operating system, welcome!\n\n"))
+
+(define-record-type* <login-configuration>
+ login-configuration make-login-configuration
+ login-configuration?
+ (motd login-configuration-motd ;file-like
+ (default %default-motd))
+ ;; Allow empty passwords by default so that first-time users can log in when
+ ;; the 'root' account has just been created.
+ (allow-empty-passwords? login-configuration-allow-empty-passwords?
+ (default #t))) ;Boolean
+
+(define (login-pam-service config)
+ "Return the list of PAM service needed for CONF."
+ ;; Let 'login' be known to PAM.
+ (list (unix-pam-service "login"
+ #:allow-empty-passwords?
+ (login-configuration-allow-empty-passwords? config)
+ #:motd
+ (login-configuration-motd config))))
+
+(define login-service-type
+ (service-type (name 'login)
+ (extensions (list (service-extension pam-root-service-type
+ login-pam-service)))))
+
+(define* (login-service #:optional (config (login-configuration)))
+ "Return a service configure login according to @var{config}, which specifies
+the message of the day, among other things."
+ (service login-service-type config))
+
+(define-record-type* <mingetty-configuration>
+ mingetty-configuration make-mingetty-configuration
+ mingetty-configuration?
+ (mingetty mingetty-configuration-mingetty ;<package>
+ (default mingetty))
+ (tty mingetty-configuration-tty) ;string
+ (auto-login mingetty-auto-login ;string | #f
+ (default #f))
+ (login-program mingetty-login-program ;gexp
+ (default #f))
+ (login-pause? mingetty-login-pause? ;Boolean
+ (default #f)))
+
+(define mingetty-shepherd-service
+ (match-lambda
+ (($ <mingetty-configuration> mingetty tty auto-login login-program
+ login-pause?)
+ (list
+ (shepherd-service
+ (documentation "Run mingetty on an tty.")
+ (provision (list (symbol-append 'term- (string->symbol tty))))
+
+ ;; Since the login prompt shows the host name, wait for the 'host-name'
+ ;; service to be done. Also wait for udev essentially so that the tty
+ ;; text is not lost in the middle of kernel messages (XXX).
+ (requirement '(user-processes host-name udev))
+
+ (start #~(make-forkexec-constructor
+ (list (string-append #$mingetty "/sbin/mingetty")
+ "--noclear" #$tty
+ #$@(if auto-login
+ #~("--autologin" #$auto-login)
+ #~())
+ #$@(if login-program
+ #~("--loginprog" #$login-program)
+ #~())
+ #$@(if login-pause?
+ #~("--loginpause")
+ #~()))))
+ (stop #~(make-kill-destructor)))))))
+
+(define mingetty-service-type
+ (service-type (name 'mingetty)
+ (extensions (list (service-extension shepherd-root-service-type
+ mingetty-shepherd-service)))))
+
+(define* (mingetty-service config)
+ "Return a service to run mingetty according to @var{config}, which specifies
+the tty to run, among other things."
+ (service mingetty-service-type config))
+
+(define-record-type* <nscd-configuration> nscd-configuration
+ make-nscd-configuration
+ nscd-configuration?
+ (log-file nscd-configuration-log-file ;string
+ (default "/var/log/nscd.log"))
+ (debug-level nscd-debug-level ;integer
+ (default 0))
+ ;; TODO: See nscd.conf in glibc for other options to add.
+ (caches nscd-configuration-caches ;list of <nscd-cache>
+ (default %nscd-default-caches))
+ (name-services nscd-configuration-name-services ;list of <packages>
+ (default '()))
+ (glibc nscd-configuration-glibc ;<package>
+ (default (canonical-package glibc))))
+
+(define-record-type* <nscd-cache> nscd-cache make-nscd-cache
+ nscd-cache?
+ (database nscd-cache-database) ;symbol
+ (positive-time-to-live nscd-cache-positive-time-to-live) ;integer
+ (negative-time-to-live nscd-cache-negative-time-to-live
+ (default 20)) ;integer
+ (suggested-size nscd-cache-suggested-size ;integer ("default module
+ ;of hash table")
+ (default 211))
+ (check-files? nscd-cache-check-files? ;Boolean
+ (default #t))
+ (persistent? nscd-cache-persistent? ;Boolean
+ (default #t))
+ (shared? nscd-cache-shared? ;Boolean
+ (default #t))
+ (max-database-size nscd-cache-max-database-size ;integer
+ (default (* 32 (expt 2 20))))
+ (auto-propagate? nscd-cache-auto-propagate? ;Boolean
+ (default #t)))
+
+(define %nscd-default-caches
+ ;; Caches that we want to enable by default. Note that when providing an
+ ;; empty nscd.conf, all caches are disabled.
+ (list (nscd-cache (database 'hosts)
+
+ ;; Aggressively cache the host name cache to improve
+ ;; privacy and resilience.
+ (positive-time-to-live (* 3600 12))
+ (negative-time-to-live 20)
+ (persistent? #t))
+
+ (nscd-cache (database 'services)
+
+ ;; Services are unlikely to change, so we can be even more
+ ;; aggressive.
+ (positive-time-to-live (* 3600 24))
+ (negative-time-to-live 3600)
+ (check-files? #t) ;check /etc/services changes
+ (persistent? #t))))
+
+(define %nscd-default-configuration
+ ;; Default nscd configuration.
+ (nscd-configuration))
+
+(define (nscd.conf-file config)
+ "Return the @file{nscd.conf} configuration file for @var{config}, an
+@code{<nscd-configuration>} object."
+ (define cache->config
+ (match-lambda
+ (($ <nscd-cache> (= symbol->string database)
+ positive-ttl negative-ttl size check-files?
+ persistent? shared? max-size propagate?)
+ (string-append "\nenable-cache\t" database "\tyes\n"
+
+ "positive-time-to-live\t" database "\t"
+ (number->string positive-ttl) "\n"
+ "negative-time-to-live\t" database "\t"
+ (number->string negative-ttl) "\n"
+ "suggested-size\t" database "\t"
+ (number->string size) "\n"
+ "check-files\t" database "\t"
+ (if check-files? "yes\n" "no\n")
+ "persistent\t" database "\t"
+ (if persistent? "yes\n" "no\n")
+ "shared\t" database "\t"
+ (if shared? "yes\n" "no\n")
+ "max-db-size\t" database "\t"
+ (number->string max-size) "\n"
+ "auto-propagate\t" database "\t"
+ (if propagate? "yes\n" "no\n")))))
+
+ (match config
+ (($ <nscd-configuration> log-file debug-level caches)
+ (plain-file "nscd.conf"
+ (string-append "\
+# Configuration of libc's name service cache daemon (nscd).\n\n"
+ (if log-file
+ (string-append "logfile\t" log-file)
+ "")
+ "\n"
+ (if debug-level
+ (string-append "debug-level\t"
+ (number->string debug-level))
+ "")
+ "\n"
+ (string-concatenate
+ (map cache->config caches)))))))
+
+(define (nscd-shepherd-service config)
+ "Return a shepherd service for CONFIG, an <nscd-configuration> object."
+ (let ((nscd.conf (nscd.conf-file config))
+ (name-services (nscd-configuration-name-services config)))
+ (list (shepherd-service
+ (documentation "Run libc's name service cache daemon (nscd).")
+ (provision '(nscd))
+ (requirement '(user-processes))
+ (start #~(make-forkexec-constructor
+ (list (string-append #$(nscd-configuration-glibc config)
+ "/sbin/nscd")
+ "-f" #$nscd.conf "--foreground")
+
+ ;; Wait for the PID file. However, the PID file is
+ ;; written before nscd is actually listening on its
+ ;; socket (XXX).
+ #:pid-file "/var/run/nscd/nscd.pid"
+
+ #:environment-variables
+ (list (string-append "LD_LIBRARY_PATH="
+ (string-join
+ (map (lambda (dir)
+ (string-append dir "/lib"))
+ (list #$@name-services))
+ ":")))))
+ (stop #~(make-kill-destructor))))))
+
+(define nscd-activation
+ ;; Actions to take before starting nscd.
+ #~(begin
+ (use-modules (guix build utils))
+ (mkdir-p "/var/run/nscd")
+ (mkdir-p "/var/db/nscd"))) ;for the persistent cache
+
+(define nscd-service-type
+ (service-type (name 'nscd)
+ (extensions
+ (list (service-extension activation-service-type
+ (const nscd-activation))
+ (service-extension shepherd-root-service-type
+ nscd-shepherd-service)))
+
+ ;; This can be extended by providing additional name services
+ ;; such as nss-mdns.
+ (compose concatenate)
+ (extend (lambda (config name-services)
+ (nscd-configuration
+ (inherit config)
+ (name-services (append
+ (nscd-configuration-name-services config)
+ name-services)))))))
+
+(define* (nscd-service #:optional (config %nscd-default-configuration))
+ "Return a service that runs libc's name service cache daemon (nscd) with the
+given @var{config}---an @code{<nscd-configuration>} object. @xref{Name
+Service Switch}, for an example."
+ (service nscd-service-type config))
+
+
+(define-record-type* <syslog-configuration>
+ syslog-configuration make-syslog-configuration
+ syslog-configuration?
+ (syslogd syslog-configuration-syslogd
+ (default (file-append inetutils "/libexec/syslogd")))
+ (config-file syslog-configuration-config-file
+ (default %default-syslog.conf)))
+
+(define syslog-service-type
+ (shepherd-service-type
+ 'syslog
+ (lambda (config)
+ (shepherd-service
+ (documentation "Run the syslog daemon (syslogd).")
+ (provision '(syslogd))
+ (requirement '(user-processes))
+ (start #~(make-forkexec-constructor
+ (list #$(syslog-configuration-syslogd config)
+ "--rcfile" #$(syslog-configuration-config-file config))
+ #:pid-file "/var/run/syslog.pid"))
+ (stop #~(make-kill-destructor))))))
+
+;; Snippet adapted from the GNU inetutils manual.
+(define %default-syslog.conf
+ (plain-file "syslog.conf" "
+ # Log all error messages, authentication messages of
+ # level notice or higher and anything of level err or
+ # higher to the console.
+ # Don't log private authentication messages!
+ *.alert;auth.notice;authpriv.none /dev/console
+
+ # Log anything (except mail) of level info or higher.
+ # Don't log private authentication messages!
+ *.info;mail.none;authpriv.none /var/log/messages
+
+ # Same, in a different place.
+ *.info;mail.none;authpriv.none /dev/tty12
+
+ # The authpriv file has restricted access.
+ authpriv.* /var/log/secure
+
+ # Log all the mail messages in one place.
+ mail.* /var/log/maillog
+"))
+
+(define* (syslog-service #:optional (config (syslog-configuration)))
+ "Return a service that runs @command{syslogd} and takes
+@var{<syslog-configuration>} as a parameter.
+
+@xref{syslogd invocation,,, inetutils, GNU Inetutils}, for more
+information on the configuration file syntax."
+ (service syslog-service-type config))
+
+
+(define pam-limits-service-type
+ (let ((security-limits
+ ;; Create /etc/security containing the provided "limits.conf" file.
+ (lambda (limits-file)
+ `(("security"
+ ,(computed-file
+ "security"
+ #~(begin
+ (mkdir #$output)
+ (stat #$limits-file)
+ (symlink #$limits-file
+ (string-append #$output "/limits.conf"))))))))
+ (pam-extension
+ (lambda (pam)
+ (let ((pam-limits (pam-entry
+ (control "required")
+ (module "pam_limits.so")
+ (arguments '("conf=/etc/security/limits.conf")))))
+ (if (member (pam-service-name pam)
+ '("login" "su" "slim"))
+ (pam-service
+ (inherit pam)
+ (session (cons pam-limits
+ (pam-service-session pam))))
+ pam)))))
+ (service-type
+ (name 'limits)
+ (extensions
+ (list (service-extension etc-service-type security-limits)
+ (service-extension pam-root-service-type
+ (lambda _ (list pam-extension))))))))
+
+(define* (pam-limits-service #:optional (limits '()))
+ "Return a service that makes selected programs respect the list of
+pam-limits-entry specified in LIMITS via pam_limits.so."
+ (service pam-limits-service-type
+ (plain-file "limits.conf"
+ (string-join (map pam-limits-entry->string limits)
+ "\n"))))
+
+\f
+;;;
+;;; Guix services.
+;;;
+
+(define* (guix-build-accounts count #:key
+ (group "guixbuild")
+ (first-uid 30001)
+ (shadow shadow))
+ "Return a list of COUNT user accounts for Guix build users, with UIDs
+starting at FIRST-UID, and under GID."
+ (unfold (cut > <> count)
+ (lambda (n)
+ (user-account
+ (name (format #f "guixbuilder~2,'0d" n))
+ (system? #t)
+ (uid (+ first-uid n -1))
+ (group group)
+
+ ;; guix-daemon expects GROUP to be listed as a
+ ;; supplementary group too:
+ ;; <http://lists.gnu.org/archive/html/bug-guix/2013-01/msg00239.html>.
+ (supplementary-groups (list group "kvm"))
+
+ (comment (format #f "Guix Build User ~2d" n))
+ (home-directory "/var/empty")
+ (shell (file-append shadow "/sbin/nologin"))))
+ 1+
+ 1))
+
+(define (hydra-key-authorization key guix)
+ "Return a gexp with code to register KEY, a file containing a 'guix archive'
+public key, with GUIX."
+ #~(unless (file-exists? "/etc/guix/acl")
+ (let ((pid (primitive-fork)))
+ (case pid
+ ((0)
+ (let* ((key #$key)
+ (port (open-file key "r0b")))
+ (format #t "registering public key '~a'...~%" key)
+ (close-port (current-input-port))
+ (dup port 0)
+ (execl (string-append #$guix "/bin/guix")
+ "guix" "archive" "--authorize")
+ (exit 1)))
+ (else
+ (let ((status (cdr (waitpid pid))))
+ (unless (zero? status)
+ (format (current-error-port) "warning: \
+failed to register hydra.gnu.org public key: ~a~%" status))))))))
+
+(define %default-authorized-guix-keys
+ ;; List of authorized substitute keys.
+ (list (file-append guix "/share/guix/hydra.gnu.org.pub")))
+
+(define-record-type* <guix-configuration>
+ guix-configuration make-guix-configuration
+ guix-configuration?
+ (guix guix-configuration-guix ;<package>
+ (default guix))
+ (build-group guix-configuration-build-group ;string
+ (default "guixbuild"))
+ (build-accounts guix-configuration-build-accounts ;integer
+ (default 10))
+ (authorize-key? guix-configuration-authorize-key? ;Boolean
+ (default #t))
+ (authorized-keys guix-configuration-authorized-keys ;list of gexps
+ (default %default-authorized-guix-keys))
+ (use-substitutes? guix-configuration-use-substitutes? ;Boolean
+ (default #t))
+ (substitute-urls guix-configuration-substitute-urls ;list of strings
+ (default %default-substitute-urls))
+ (extra-options guix-configuration-extra-options ;list of strings
+ (default '()))
+ (lsof guix-configuration-lsof ;<package>
+ (default lsof))
+ (lsh guix-configuration-lsh ;<package>
+ (default lsh)))
+
+(define %default-guix-configuration
+ (guix-configuration))
+
+(define (guix-shepherd-service config)
+ "Return a <shepherd-service> for the Guix daemon service with CONFIG."
+ (match config
+ (($ <guix-configuration> guix build-group build-accounts
+ authorize-key? keys
+ use-substitutes? substitute-urls extra-options
+ lsof lsh)
+ (list (shepherd-service
+ (documentation "Run the Guix daemon.")
+ (provision '(guix-daemon))
+ (requirement '(user-processes))
+ (start
+ #~(make-forkexec-constructor
+ (list (string-append #$guix "/bin/guix-daemon")
+ "--build-users-group" #$build-group
+ #$@(if use-substitutes?
+ '()
+ '("--no-substitutes"))
+ "--substitute-urls" #$(string-join substitute-urls)
+ #$@extra-options)
+
+ ;; Add 'lsof' (for the GC) and 'lsh' (for offloading) to the
+ ;; daemon's $PATH.
+ #:environment-variables
+ (list (string-append "PATH=" #$lsof "/bin:" #$lsh "/bin"))))
+ (stop #~(make-kill-destructor)))))))
+
+(define (guix-accounts config)
+ "Return the user accounts and user groups for CONFIG."
+ (match config
+ (($ <guix-configuration> _ build-group build-accounts)
+ (cons (user-group
+ (name build-group)
+ (system? #t)
+
+ ;; Use a fixed GID so that we can create the store with the right
+ ;; owner.
+ (id 30000))
+ (guix-build-accounts build-accounts
+ #:group build-group)))))
+
+(define (guix-activation config)
+ "Return the activation gexp for CONFIG."
+ (match config
+ (($ <guix-configuration> guix build-group build-accounts authorize-key? keys)
+ ;; Assume that the store has BUILD-GROUP as its group. We could
+ ;; otherwise call 'chown' here, but the problem is that on a COW unionfs,
+ ;; chown leads to an entire copy of the tree, which is a bad idea.
+
+ ;; Optionally authorize hydra.gnu.org's key.
+ (if authorize-key?
+ #~(begin
+ #$@(map (cut hydra-key-authorization <> guix) keys))
+ #~#f))))
+
+(define guix-service-type
+ (service-type
+ (name 'guix)
+ (extensions
+ (list (service-extension shepherd-root-service-type guix-shepherd-service)
+ (service-extension account-service-type guix-accounts)
+ (service-extension activation-service-type guix-activation)
+ (service-extension profile-service-type
+ (compose list guix-configuration-guix))))))
+
+(define* (guix-service #:optional (config %default-guix-configuration))
+ "Return a service that runs the Guix build daemon according to
+@var{config}."
+ (service guix-service-type config))
+
+
+(define-record-type* <guix-publish-configuration>
+ guix-publish-configuration make-guix-publish-configuration
+ guix-publish-configuration?
+ (guix guix-publish-configuration-guix ;package
+ (default guix))
+ (port guix-publish-configuration-port ;number
+ (default 80))
+ (host guix-publish-configuration-host ;string
+ (default "localhost")))
+
+(define guix-publish-shepherd-service
+ (match-lambda
+ (($ <guix-publish-configuration> guix port host)
+ (list (shepherd-service
+ (provision '(guix-publish))
+ (requirement '(guix-daemon))
+ (start #~(make-forkexec-constructor
+ (list (string-append #$guix "/bin/guix")
+ "publish" "-u" "guix-publish"
+ "-p" #$(number->string port)
+ (string-append "--listen=" #$host))))
+ (stop #~(make-kill-destructor)))))))
+
+(define %guix-publish-accounts
+ (list (user-group (name "guix-publish") (system? #t))
+ (user-account
+ (name "guix-publish")
+ (group "guix-publish")
+ (system? #t)
+ (comment "guix publish user")
+ (home-directory "/var/empty")
+ (shell (file-append shadow "/sbin/nologin")))))
+
+(define guix-publish-service-type
+ (service-type (name 'guix-publish)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ guix-publish-shepherd-service)
+ (service-extension account-service-type
+ (const %guix-publish-accounts))))))
+
+(define* (guix-publish-service #:key (guix guix) (port 80) (host "localhost"))
+ "Return a service that runs @command{guix publish} listening on @var{host}
+and @var{port} (@pxref{Invoking guix publish}).
+
+This assumes that @file{/etc/guix} already contains a signing key pair as
+created by @command{guix archive --generate-key} (@pxref{Invoking guix
+archive}). If that is not the case, the service will fail to start."
+ (service guix-publish-service-type
+ (guix-publish-configuration (guix guix) (port port) (host host))))
+
+\f
+;;;
+;;; Udev.
+;;;
+
+(define-record-type* <udev-configuration>
+ udev-configuration make-udev-configuration
+ udev-configuration?
+ (udev udev-configuration-udev ;<package>
+ (default udev))
+ (rules udev-configuration-rules ;list of <package>
+ (default '())))
+
+(define (udev-rules-union packages)
+ "Return the union of the @code{lib/udev/rules.d} directories found in each
+item of @var{packages}."
+ (define build
+ (with-imported-modules '((guix build union)
+ (guix build utils))
+ #~(begin
+ (use-modules (guix build union)
+ (guix build utils)
+ (srfi srfi-1)
+ (srfi srfi-26))
+
+ (define %standard-locations
+ '("/lib/udev/rules.d" "/libexec/udev/rules.d"))
+
+ (define (rules-sub-directory directory)
+ ;; Return the sub-directory of DIRECTORY containing udev rules, or
+ ;; #f if none was found.
+ (find directory-exists?
+ (map (cut string-append directory <>) %standard-locations)))
+
+ (mkdir-p (string-append #$output "/lib/udev"))
+ (union-build (string-append #$output "/lib/udev/rules.d")
+ (filter-map rules-sub-directory '#$packages)))))
+
+ (computed-file "udev-rules" build))
+
+(define (udev-rule file-name contents)
+ "Return a directory with a udev rule file FILE-NAME containing CONTENTS."
+ (computed-file file-name
+ (with-imported-modules '((guix build utils))
+ #~(begin
+ (use-modules (guix build utils))
+
+ (define rules.d
+ (string-append #$output "/lib/udev/rules.d"))
+
+ (mkdir-p rules.d)
+ (call-with-output-file
+ (string-append rules.d "/" #$file-name)
+ (lambda (port)
+ (display #$contents port)))))))
+
+(define kvm-udev-rule
+ ;; Return a directory with a udev rule that changes the group of /dev/kvm to
+ ;; "kvm" and makes it #o660. Apparently QEMU-KVM used to ship this rule,
+ ;; but now we have to add it by ourselves.
+
+ ;; Build users are part of the "kvm" group, so we can fearlessly make
+ ;; /dev/kvm 660 (see <http://bugs.gnu.org/18994>, for background.)
+ (udev-rule "90-kvm.rules"
+ "KERNEL==\"kvm\", GROUP=\"kvm\", MODE=\"0660\"\n"))
+
+(define udev-shepherd-service
+ ;; Return a <shepherd-service> for UDEV with RULES.
+ (match-lambda
+ (($ <udev-configuration> udev rules)
+ (let* ((rules (udev-rules-union (cons* udev kvm-udev-rule rules)))
+ (udev.conf (computed-file "udev.conf"
+ #~(call-with-output-file #$output
+ (lambda (port)
+ (format port
+ "udev_rules=\"~a/lib/udev/rules.d\"\n"
+ #$rules))))))
+ (list
+ (shepherd-service
+ (provision '(udev))
+
+ ;; Udev needs /dev to be a 'devtmpfs' mount so that new device nodes can
+ ;; be added: see
+ ;; <http://www.linuxfromscratch.org/lfs/view/development/chapter07/udev.html>.
+ (requirement '(root-file-system))
+
+ (documentation "Populate the /dev directory, dynamically.")
+ (start #~(lambda ()
+ (define find
+ (@ (srfi srfi-1) find))
+
+ (define udevd
+ ;; Choose the right 'udevd'.
+ (find file-exists?
+ (map (lambda (suffix)
+ (string-append #$udev suffix))
+ '("/libexec/udev/udevd" ;udev
+ "/sbin/udevd")))) ;eudev
+
+ (define (wait-for-udevd)
+ ;; Wait until someone's listening on udevd's control
+ ;; socket.
+ (let ((sock (socket AF_UNIX SOCK_SEQPACKET 0)))
+ (let try ()
+ (catch 'system-error
+ (lambda ()
+ (connect sock PF_UNIX "/run/udev/control")
+ (close-port sock))
+ (lambda args
+ (format #t "waiting for udevd...~%")
+ (usleep 500000)
+ (try))))))
+
+ ;; Allow udev to find the modules.
+ (setenv "LINUX_MODULE_DIRECTORY"
+ "/run/booted-system/kernel/lib/modules")
+
+ ;; The first one is for udev, the second one for eudev.
+ (setenv "UDEV_CONFIG_FILE" #$udev.conf)
+ (setenv "EUDEV_RULES_DIRECTORY"
+ (string-append #$rules "/lib/udev/rules.d"))
+
+ (let ((pid (primitive-fork)))
+ (case pid
+ ((0)
+ (exec-command (list udevd)))
+ (else
+ ;; Wait until udevd is up and running. This
+ ;; appears to be needed so that the events
+ ;; triggered below are actually handled.
+ (wait-for-udevd)
+
+ ;; Trigger device node creation.
+ (system* (string-append #$udev "/bin/udevadm")
+ "trigger" "--action=add")
+
+ ;; Wait for things to settle down.
+ (system* (string-append #$udev "/bin/udevadm")
+ "settle")
+ pid)))))
+ (stop #~(make-kill-destructor))
+
+ ;; When halting the system, 'udev' is actually killed by
+ ;; 'user-processes', i.e., before its own 'stop' method was called.
+ ;; Thus, make sure it is not respawned.
+ (respawn? #f)))))))
+
+(define udev-service-type
+ (service-type (name 'udev)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ udev-shepherd-service)))
+
+ (compose concatenate) ;concatenate the list of rules
+ (extend (lambda (config rules)
+ (match config
+ (($ <udev-configuration> udev initial-rules)
+ (udev-configuration
+ (udev udev)
+ (rules (append initial-rules rules)))))))))
+
+(define* (udev-service #:key (udev eudev) (rules '()))
+ "Run @var{udev}, which populates the @file{/dev} directory dynamically. Get
+extra rules from the packages listed in @var{rules}."
+ (service udev-service-type
+ (udev-configuration (udev udev) (rules rules))))
+
+(define swap-service-type
+ (shepherd-service-type
+ 'swap
+ (lambda (device)
+ (define requirement
+ (if (string-prefix? "/dev/mapper/" device)
+ (list (symbol-append 'device-mapping-
+ (string->symbol (basename device))))
+ '()))
+
+ (shepherd-service
+ (provision (list (symbol-append 'swap- (string->symbol device))))
+ (requirement `(udev ,@requirement))
+ (documentation "Enable the given swap device.")
+ (start #~(lambda ()
+ (restart-on-EINTR (swapon #$device))
+ #t))
+ (stop #~(lambda _
+ (restart-on-EINTR (swapoff #$device))
+ #f))
+ (respawn? #f)))))
+
+(define (swap-service device)
+ "Return a service that uses @var{device} as a swap device."
+ (service swap-service-type device))
+
+(define-record-type* <gpm-configuration>
+ gpm-configuration make-gpm-configuration gpm-configuration?
+ (gpm gpm-configuration-gpm) ;package
+ (options gpm-configuration-options)) ;list of strings
+
+(define gpm-shepherd-service
+ (match-lambda
+ (($ <gpm-configuration> gpm options)
+ (list (shepherd-service
+ (requirement '(udev))
+ (provision '(gpm))
+ (start #~(lambda ()
+ ;; 'gpm' runs in the background and sets a PID file.
+ ;; Note that it requires running as "root".
+ (false-if-exception (delete-file "/var/run/gpm.pid"))
+ (fork+exec-command (list (string-append #$gpm "/sbin/gpm")
+ #$@options))
+
+ ;; Wait for the PID file to appear; declare failure if
+ ;; it doesn't show up.
+ (let loop ((i 3))
+ (or (file-exists? "/var/run/gpm.pid")
+ (if (zero? i)
+ #f
+ (begin
+ (sleep 1)
+ (loop (1- i))))))))
+
+ (stop #~(lambda (_)
+ ;; Return #f if successfully stopped.
+ (not (zero? (system* (string-append #$gpm "/sbin/gpm")
+ "-k"))))))))))
+
+(define gpm-service-type
+ (service-type (name 'gpm)
+ (extensions
+ (list (service-extension shepherd-root-service-type
+ gpm-shepherd-service)))))
+
+(define* (gpm-service #:key (gpm gpm)
+ (options '("-m" "/dev/input/mice" "-t" "ps2")))
+ "Run @var{gpm}, the general-purpose mouse daemon, with the given
+command-line @var{options}. GPM allows users to use the mouse in the console,
+notably to select, copy, and paste text. The default value of @var{options}
+uses the @code{ps2} protocol, which works for both USB and PS/2 mice.
+
+This service is not part of @var{%base-services}."
+ ;; To test in QEMU, use "-usbdevice mouse" and then, in the monitor, use
+ ;; "info mice" and "mouse_set X" to use the right mouse.
+ (service gpm-service-type
+ (gpm-configuration (gpm gpm) (options options))))
+
+(define-record-type* <kmscon-configuration>
+ kmscon-configuration make-kmscon-configuration
+ kmscon-configuration?
+ (kmscon kmscon-configuration-kmscon
+ (default kmscon))
+ (virtual-terminal kmscon-configuration-virtual-terminal)
+ (login-program kmscon-configuration-login-program
+ (default #~(string-append #$shadow "/bin/login")))
+ (login-arguments kmscon-configuration-login-arguments
+ (default '("-p")))
+ (hardware-acceleration? kmscon-configuration-hardware-acceleration?
+ (default #f))) ; #t causes failure
+
+(define kmscon-service-type
+ (shepherd-service-type
+ 'kmscon
+ (lambda (config)
+ (let ((kmscon (kmscon-configuration-kmscon config))
+ (virtual-terminal (kmscon-configuration-virtual-terminal config))
+ (login-program (kmscon-configuration-login-program config))
+ (login-arguments (kmscon-configuration-login-arguments config))
+ (hardware-acceleration? (kmscon-configuration-hardware-acceleration? config)))
+
+ (define kmscon-command
+ #~(list
+ (string-append #$kmscon "/bin/kmscon") "--login"
+ "--vt" #$virtual-terminal
+ #$@(if hardware-acceleration? '("--hwaccel") '())
+ "--" #$login-program #$@login-arguments))
+
+ (shepherd-service
+ (documentation "kmscon virtual terminal")
+ (requirement '(user-processes udev dbus-system))
+ (provision (list (symbol-append 'term- (string->symbol virtual-terminal))))
+ (start #~(make-forkexec-constructor #$kmscon-command))
+ (stop #~(make-kill-destructor)))))))
+
+\f
+(define %base-services
+ ;; Convenience variable holding the basic services.
+ (list (login-service)
+
+ (service console-font-service-type
+ (map (lambda (tty)
+ (cons tty %default-console-font))
+ '("tty1" "tty2" "tty3" "tty4" "tty5" "tty6")))
+
+ (mingetty-service (mingetty-configuration
+ (tty "tty1")))
+ (mingetty-service (mingetty-configuration
+ (tty "tty2")))
+ (mingetty-service (mingetty-configuration
+ (tty "tty3")))
+ (mingetty-service (mingetty-configuration
+ (tty "tty4")))
+ (mingetty-service (mingetty-configuration
+ (tty "tty5")))
+ (mingetty-service (mingetty-configuration
+ (tty "tty6")))
+
+ (static-networking-service "lo" "127.0.0.1"
+ #:provision '(loopback))
+ (syslog-service)
+ (urandom-seed-service)
+ (guix-service)
+ (nscd-service)
+
+ ;; The LVM2 rules are needed as soon as LVM2 or the device-mapper is
+ ;; used, so enable them by default. The FUSE and ALSA rules are
+ ;; less critical, but handy.
+ (udev-service #:rules (list lvm2 fuse alsa-utils crda))))
+
+;;; base.scm ends here
HCoop / jackhill / guix / guix.git / blobdiff