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88840f02 | 1 | ;;; GNU Guix --- Functional package management for GNU |
b97c95eb | 2 | ;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org> |
88840f02 LC |
3 | ;;; |
4 | ;;; This file is part of GNU Guix. | |
5 | ;;; | |
6 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
7 | ;;; under the terms of the GNU General Public License as published by | |
8 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
9 | ;;; your option) any later version. | |
10 | ;;; | |
11 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
12 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;;; GNU General Public License for more details. | |
15 | ;;; | |
16 | ;;; You should have received a copy of the GNU General Public License | |
17 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
18 | ||
19 | (define-module (guix build linux-initrd) | |
20 | #:use-module (rnrs io ports) | |
21 | #:use-module (system foreign) | |
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22 | #:autoload (system repl repl) (start-repl) |
23 | #:autoload (system base compile) (compile-file) | |
24 | #:use-module (srfi srfi-1) | |
25 | #:use-module (srfi srfi-26) | |
26 | #:use-module (ice-9 match) | |
44ddf33e | 27 | #:use-module (ice-9 ftw) |
d4254711 | 28 | #:use-module (guix build utils) |
88840f02 LC |
29 | #:export (mount-essential-file-systems |
30 | linux-command-line | |
d91712ee | 31 | make-essential-device-nodes |
88840f02 LC |
32 | configure-qemu-networking |
33 | mount-qemu-smb-share | |
4919d684 | 34 | mount-qemu-9p |
89bf140b | 35 | bind-mount |
88840f02 | 36 | load-linux-module* |
d4254711 LC |
37 | device-number |
38 | boot-system)) | |
88840f02 LC |
39 | |
40 | ;;; Commentary: | |
41 | ;;; | |
42 | ;;; Utility procedures useful in a Linux initial RAM disk (initrd). Note that | |
43 | ;;; many of these use procedures not yet available in vanilla Guile (`mount', | |
44 | ;;; `load-linux-module', etc.); these are provided by a Guile patch used in | |
45 | ;;; the GNU distribution. | |
46 | ;;; | |
47 | ;;; Code: | |
48 | ||
49 | (define* (mount-essential-file-systems #:key (root "/")) | |
50 | "Mount /proc and /sys under ROOT." | |
51 | (define (scope dir) | |
52 | (string-append root | |
53 | (if (string-suffix? "/" root) | |
54 | "" | |
55 | "/") | |
56 | dir)) | |
57 | ||
58 | (unless (file-exists? (scope "proc")) | |
59 | (mkdir (scope "proc"))) | |
60 | (mount "none" (scope "proc") "proc") | |
61 | ||
62 | (unless (file-exists? (scope "sys")) | |
63 | (mkdir (scope "sys"))) | |
64 | (mount "none" (scope "sys") "sysfs")) | |
65 | ||
66 | (define (linux-command-line) | |
67 | "Return the Linux kernel command line as a list of strings." | |
68 | (string-tokenize | |
69 | (call-with-input-file "/proc/cmdline" | |
70 | get-string-all))) | |
71 | ||
d91712ee LC |
72 | (define* (make-essential-device-nodes #:key (root "/")) |
73 | "Make essential device nodes under ROOT/dev." | |
74 | ;; The hand-made udev! | |
75 | ||
76 | (define (scope dir) | |
77 | (string-append root | |
78 | (if (string-suffix? "/" root) | |
79 | "" | |
80 | "/") | |
81 | dir)) | |
82 | ||
83 | (unless (file-exists? (scope "dev")) | |
84 | (mkdir (scope "dev"))) | |
85 | ||
fc4bc4b6 LC |
86 | ;; Make the device nodes for SCSI disks. |
87 | (mknod (scope "dev/sda") 'block-special #o644 (device-number 8 0)) | |
88 | (mknod (scope "dev/sda1") 'block-special #o644 (device-number 8 1)) | |
89 | (mknod (scope "dev/sda2") 'block-special #o644 (device-number 8 2)) | |
90 | ||
91 | ;; The virtio (para-virtualized) block devices, as supported by QEMU/KVM. | |
92 | (mknod (scope "dev/vda") 'block-special #o644 (device-number 252 0)) | |
93 | (mknod (scope "dev/vda1") 'block-special #o644 (device-number 252 1)) | |
94 | (mknod (scope "dev/vda2") 'block-special #o644 (device-number 252 2)) | |
d91712ee | 95 | |
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96 | ;; Memory (used by Xorg's VESA driver.) |
97 | (mknod (scope "dev/mem") 'char-special #o640 (device-number 1 1)) | |
98 | (mknod (scope "dev/kmem") 'char-special #o640 (device-number 1 2)) | |
99 | ||
d91712ee | 100 | ;; TTYs. |
29804e6e LC |
101 | (mknod (scope "dev/tty") 'char-special #o600 |
102 | (device-number 5 0)) | |
d91712ee LC |
103 | (let loop ((n 0)) |
104 | (and (< n 50) | |
105 | (let ((name (format #f "dev/tty~a" n))) | |
29804e6e | 106 | (mknod (scope name) 'char-special #o600 |
d91712ee LC |
107 | (device-number 4 n)) |
108 | (loop (+ 1 n))))) | |
109 | ||
37c825eb LC |
110 | ;; Rendez-vous point for syslogd. |
111 | (mknod (scope "dev/log") 'socket #o666 0) | |
112 | (mknod (scope "dev/kmsg") 'char-special #o600 (device-number 1 11)) | |
113 | ||
d91712ee LC |
114 | ;; Other useful nodes. |
115 | (mknod (scope "dev/null") 'char-special #o666 (device-number 1 3)) | |
b97c95eb LC |
116 | (mknod (scope "dev/zero") 'char-special #o666 (device-number 1 5)) |
117 | (chmod (scope "dev/null") #o666) | |
118 | (chmod (scope "dev/zero") #o666)) | |
d91712ee | 119 | |
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120 | (define %host-qemu-ipv4-address |
121 | (inet-pton AF_INET "10.0.2.10")) | |
122 | ||
123 | (define* (configure-qemu-networking #:optional (interface "eth0")) | |
124 | "Setup the INTERFACE network interface and /etc/resolv.conf according to | |
125 | QEMU's default networking settings (see net/slirp.c in QEMU for default | |
126 | networking values.) Return #t if INTERFACE is up, #f otherwise." | |
127 | (display "configuring QEMU networking...\n") | |
128 | (let* ((sock (socket AF_INET SOCK_STREAM 0)) | |
129 | (address (make-socket-address AF_INET %host-qemu-ipv4-address 0)) | |
130 | (flags (network-interface-flags sock interface))) | |
131 | (set-network-interface-address sock interface address) | |
132 | (set-network-interface-flags sock interface (logior flags IFF_UP)) | |
133 | ||
134 | (unless (file-exists? "/etc") | |
135 | (mkdir "/etc")) | |
136 | (call-with-output-file "/etc/resolv.conf" | |
137 | (lambda (p) | |
138 | (display "nameserver 10.0.2.3\n" p))) | |
139 | ||
140 | (logand (network-interface-flags sock interface) IFF_UP))) | |
141 | ||
142 | (define (mount-qemu-smb-share share mount-point) | |
143 | "Mount QEMU's CIFS/SMB SHARE at MOUNT-POINT. | |
144 | ||
145 | Vanilla QEMU's `-smb' option just exports a /qemu share, whereas our | |
146 | `qemu-with-multiple-smb-shares' package exports the /xchg and /store shares | |
147 | (the latter allows the store to be shared between the host and guest.)" | |
148 | ||
149 | (format #t "mounting QEMU's SMB share `~a'...\n" share) | |
150 | (let ((server "10.0.2.4")) | |
151 | (mount (string-append "//" server share) mount-point "cifs" 0 | |
152 | (string->pointer "guest,sec=none")))) | |
153 | ||
4919d684 LC |
154 | (define (mount-qemu-9p source mount-point) |
155 | "Mount QEMU's 9p file system from SOURCE at MOUNT-POINT. | |
156 | ||
157 | This uses the 'virtio' transport, which requires the various virtio Linux | |
158 | modules to be loaded." | |
159 | ||
160 | (format #t "mounting QEMU's 9p share '~a'...\n" source) | |
161 | (let ((server "10.0.2.4")) | |
162 | (mount source mount-point "9p" 0 | |
163 | (string->pointer "trans=virtio")))) | |
164 | ||
89bf140b LC |
165 | (define (bind-mount source target) |
166 | "Bind-mount SOURCE at TARGET." | |
167 | (define MS_BIND 4096) ; from libc's <sys/mount.h> | |
168 | ||
169 | (mount source target "" MS_BIND)) | |
170 | ||
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171 | (define (load-linux-module* file) |
172 | "Load Linux module from FILE, the name of a `.ko' file." | |
173 | (define (slurp module) | |
174 | (call-with-input-file file get-bytevector-all)) | |
175 | ||
176 | (load-linux-module (slurp file))) | |
177 | ||
178 | (define (device-number major minor) | |
179 | "Return the device number for the device with MAJOR and MINOR, for use as | |
180 | the last argument of `mknod'." | |
181 | (+ (* major 256) minor)) | |
182 | ||
d4254711 LC |
183 | (define* (boot-system #:key |
184 | (linux-modules '()) | |
185 | qemu-guest-networking? | |
186 | guile-modules-in-chroot? | |
44ddf33e | 187 | volatile-root? |
d4254711 LC |
188 | (mounts '())) |
189 | "This procedure is meant to be called from an initrd. Boot a system by | |
190 | first loading LINUX-MODULES, then setting up QEMU guest networking if | |
191 | QEMU-GUEST-NETWORKING? is true, mounting the file systems specified in MOUNTS, | |
192 | and finally booting into the new root if any. The initrd supports kernel | |
193 | command-line options '--load', '--root', and '--repl'. | |
194 | ||
195 | MOUNTS must be a list of elements of the form: | |
196 | ||
197 | (FILE-SYSTEM-TYPE SOURCE TARGET) | |
198 | ||
199 | When GUILE-MODULES-IN-CHROOT? is true, make core Guile modules available in | |
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200 | the new root. |
201 | ||
202 | When VOLATILE-ROOT? is true, the root file system is writable but any changes | |
203 | to it are lost." | |
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204 | (define (resolve file) |
205 | ;; If FILE is a symlink to an absolute file name, resolve it as if we were | |
206 | ;; under /root. | |
207 | (let ((st (lstat file))) | |
208 | (if (eq? 'symlink (stat:type st)) | |
209 | (let ((target (readlink file))) | |
210 | (resolve (string-append "/root" target))) | |
211 | file))) | |
212 | ||
44ddf33e LC |
213 | (define MS_RDONLY 1) |
214 | ||
d4254711 LC |
215 | (display "Welcome, this is GNU's early boot Guile.\n") |
216 | (display "Use '--repl' for an initrd REPL.\n\n") | |
217 | ||
218 | (mount-essential-file-systems) | |
219 | (let* ((args (linux-command-line)) | |
220 | (option (lambda (opt) | |
221 | (let ((opt (string-append opt "="))) | |
222 | (and=> (find (cut string-prefix? opt <>) | |
223 | args) | |
224 | (lambda (arg) | |
225 | (substring arg (+ 1 (string-index arg #\=)))))))) | |
226 | (to-load (option "--load")) | |
227 | (root (option "--root"))) | |
228 | ||
229 | (when (member "--repl" args) | |
230 | (start-repl)) | |
231 | ||
232 | (display "loading kernel modules...\n") | |
233 | (for-each (compose load-linux-module* | |
234 | (cut string-append "/modules/" <>)) | |
235 | linux-modules) | |
236 | ||
237 | (when qemu-guest-networking? | |
238 | (unless (configure-qemu-networking) | |
239 | (display "network interface is DOWN\n"))) | |
240 | ||
241 | ;; Make /dev nodes. | |
242 | (make-essential-device-nodes) | |
243 | ||
244 | ;; Prepare the real root file system under /root. | |
245 | (unless (file-exists? "/root") | |
246 | (mkdir "/root")) | |
247 | (if root | |
83b9e6a1 LC |
248 | (catch #t |
249 | (lambda () | |
44ddf33e LC |
250 | (if volatile-root? |
251 | (begin | |
252 | ;; XXX: For lack of a union file system... | |
253 | (mkdir-p "/real-root") | |
254 | (mount root "/real-root" "ext3" MS_RDONLY) | |
255 | (mount "none" "/root" "tmpfs") | |
256 | ||
257 | ;; XXX: 'copy-recursively' cannot deal with device nodes, so | |
258 | ;; explicitly avoid /dev. | |
259 | (for-each (lambda (file) | |
260 | (unless (string=? "dev" file) | |
261 | (copy-recursively (string-append "/real-root/" | |
262 | file) | |
263 | (string-append "/root/" | |
264 | file) | |
265 | #:log (%make-void-port | |
266 | "w")))) | |
267 | (scandir "/real-root" | |
268 | (lambda (file) | |
269 | (not (member file '("." "..")))))) | |
270 | ||
271 | ;; TODO: Unmount /real-root. | |
272 | ) | |
273 | (mount root "/root" "ext3"))) | |
83b9e6a1 LC |
274 | (lambda args |
275 | (format (current-error-port) "exception while mounting '~a': ~s~%" | |
276 | root args) | |
277 | (start-repl))) | |
d4254711 | 278 | (mount "none" "/root" "tmpfs")) |
44ddf33e | 279 | |
d4254711 LC |
280 | (mount-essential-file-systems #:root "/root") |
281 | ||
282 | (unless (file-exists? "/root/dev") | |
283 | (mkdir "/root/dev") | |
284 | (make-essential-device-nodes #:root "/root")) | |
285 | ||
286 | ;; Mount the specified file systems. | |
287 | (for-each (match-lambda | |
288 | (('cifs source target) | |
289 | (let ((target (string-append "/root/" target))) | |
290 | (mkdir-p target) | |
291 | (mount-qemu-smb-share source target))) | |
4919d684 LC |
292 | (('9p source target) |
293 | (let ((target (string-append "/root/" target))) | |
294 | (mkdir-p target) | |
295 | (mount-qemu-9p source target)))) | |
d4254711 LC |
296 | mounts) |
297 | ||
298 | (when guile-modules-in-chroot? | |
299 | ;; Copy the directories that contain .scm and .go files so that the | |
300 | ;; child process in the chroot can load modules (we would bind-mount | |
301 | ;; them but for some reason that fails with EINVAL -- XXX). | |
302 | (mkdir-p "/root/share") | |
303 | (mkdir-p "/root/lib") | |
304 | (mount "none" "/root/share" "tmpfs") | |
305 | (mount "none" "/root/lib" "tmpfs") | |
306 | (copy-recursively "/share" "/root/share" | |
307 | #:log (%make-void-port "w")) | |
308 | (copy-recursively "/lib" "/root/lib" | |
309 | #:log (%make-void-port "w"))) | |
310 | ||
311 | (if to-load | |
312 | (begin | |
313 | (format #t "loading '~a'...\n" to-load) | |
314 | (chroot "/root") | |
315 | ;; TODO: Remove /lib, /share, and /loader.go. | |
316 | (catch #t | |
317 | (lambda () | |
318 | (primitive-load to-load)) | |
319 | (lambda args | |
320 | (format (current-error-port) "'~a' raised an exception: ~s~%" | |
321 | to-load args) | |
322 | (start-repl))) | |
323 | (format (current-error-port) | |
324 | "boot program '~a' terminated, rebooting~%" | |
325 | to-load) | |
326 | (sleep 2) | |
327 | (reboot)) | |
328 | (begin | |
329 | (display "no boot file passed via '--load'\n") | |
330 | (display "entering a warm and cozy REPL\n") | |
331 | (start-repl))))) | |
332 | ||
88840f02 | 333 | ;;; linux-initrd.scm ends here |