diff options
| author | Ludovic Courtès <ludo@gnu.org> | 2014-09-03 11:14:12 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2014-09-03 15:43:07 +0200 |
| commit | 8a9e21d1f719748213414343cd02ec113ebe90c1 (patch) | |
| tree | a797acf09699ec6f233e88c6ccef23eeddd83185 /gnu/build/linux-initrd.scm | |
| parent | 548f7a8fa2a4745d0e35e175e201513857440991 (diff) | |
Rename (gnu build linux-initrd) to (gnu build linux-boot).
* gnu/build/linux-initrd.scm: Rename to...
* gnu/build/linux-boot.scm: ... this.
* gnu-system.am (GNU_SYSTEM_MODULES): Adjust accordingly.
* gnu/build/activation.scm, gnu/build/vm.scm, gnu/services/base.scm,
gnu/services/dmd.scm, gnu/system.scm, gnu/system/linux-initrd.scm,
gnu/system/vm.scm: Adjust accordingly.
Diffstat (limited to 'gnu/build/linux-initrd.scm')
| -rw-r--r-- | gnu/build/linux-initrd.scm | 702 |
1 files changed, 0 insertions, 702 deletions
diff --git a/gnu/build/linux-initrd.scm b/gnu/build/linux-initrd.scm deleted file mode 100644 index 60c5eec10fd..00000000000 --- a/gnu/build/linux-initrd.scm +++ /dev/null | |||
| @@ -1,702 +0,0 @@ | |||
| 1 | ;;; GNU Guix --- Functional package management for GNU | ||
| 2 | ;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org> | ||
| 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 (gnu build linux-initrd) | ||
| 20 | #:use-module (rnrs io ports) | ||
| 21 | #:use-module (rnrs bytevectors) | ||
| 22 | #:use-module (system foreign) | ||
| 23 | #:use-module (system repl error-handling) | ||
| 24 | #:autoload (system repl repl) (start-repl) | ||
| 25 | #:autoload (system base compile) (compile-file) | ||
| 26 | #:use-module (srfi srfi-1) | ||
| 27 | #:use-module (srfi srfi-26) | ||
| 28 | #:use-module (ice-9 match) | ||
| 29 | #:use-module (ice-9 rdelim) | ||
| 30 | #:use-module (ice-9 ftw) | ||
| 31 | #:use-module (guix build utils) | ||
| 32 | #:export (mount-essential-file-systems | ||
| 33 | linux-command-line | ||
| 34 | find-long-option | ||
| 35 | make-essential-device-nodes | ||
| 36 | configure-qemu-networking | ||
| 37 | |||
| 38 | disk-partitions | ||
| 39 | partition-label-predicate | ||
| 40 | find-partition-by-label | ||
| 41 | canonicalize-device-spec | ||
| 42 | |||
| 43 | mount-flags->bit-mask | ||
| 44 | check-file-system | ||
| 45 | mount-file-system | ||
| 46 | bind-mount | ||
| 47 | |||
| 48 | load-linux-module* | ||
| 49 | device-number | ||
| 50 | boot-system)) | ||
| 51 | |||
| 52 | ;;; Commentary: | ||
| 53 | ;;; | ||
| 54 | ;;; Utility procedures useful in a Linux initial RAM disk (initrd). Note that | ||
| 55 | ;;; many of these use procedures not yet available in vanilla Guile (`mount', | ||
| 56 | ;;; `load-linux-module', etc.); these are provided by a Guile patch used in | ||
| 57 | ;;; the GNU distribution. | ||
| 58 | ;;; | ||
| 59 | ;;; Code: | ||
| 60 | |||
| 61 | (define* (mount-essential-file-systems #:key (root "/")) | ||
| 62 | "Mount /proc and /sys under ROOT." | ||
| 63 | (define (scope dir) | ||
| 64 | (string-append root | ||
| 65 | (if (string-suffix? "/" root) | ||
| 66 | "" | ||
| 67 | "/") | ||
| 68 | dir)) | ||
| 69 | |||
| 70 | (unless (file-exists? (scope "proc")) | ||
| 71 | (mkdir (scope "proc"))) | ||
| 72 | (mount "none" (scope "proc") "proc") | ||
| 73 | |||
| 74 | (unless (file-exists? (scope "sys")) | ||
| 75 | (mkdir (scope "sys"))) | ||
| 76 | (mount "none" (scope "sys") "sysfs")) | ||
| 77 | |||
| 78 | (define (move-essential-file-systems root) | ||
| 79 | "Move currently mounted essential file systems to ROOT." | ||
| 80 | (for-each (lambda (dir) | ||
| 81 | (let ((target (string-append root dir))) | ||
| 82 | (unless (file-exists? target) | ||
| 83 | (mkdir target)) | ||
| 84 | (mount dir target "" MS_MOVE))) | ||
| 85 | '("/proc" "/sys"))) | ||
| 86 | |||
| 87 | (define (linux-command-line) | ||
| 88 | "Return the Linux kernel command line as a list of strings." | ||
| 89 | (string-tokenize | ||
| 90 | (call-with-input-file "/proc/cmdline" | ||
| 91 | get-string-all))) | ||
| 92 | |||
| 93 | (define (find-long-option option arguments) | ||
| 94 | "Find OPTION among ARGUMENTS, where OPTION is something like \"--load\". | ||
| 95 | Return the value associated with OPTION, or #f on failure." | ||
| 96 | (let ((opt (string-append option "="))) | ||
| 97 | (and=> (find (cut string-prefix? opt <>) | ||
| 98 | arguments) | ||
| 99 | (lambda (arg) | ||
| 100 | (substring arg (+ 1 (string-index arg #\=))))))) | ||
| 101 | |||
| 102 | (define-syntax %ext2-endianness | ||
| 103 | ;; Endianness of ext2 file systems. | ||
| 104 | (identifier-syntax (endianness little))) | ||
| 105 | |||
| 106 | ;; Offset in bytes of interesting parts of an ext2 superblock. See | ||
| 107 | ;; <http://www.nongnu.org/ext2-doc/ext2.html#DEF-SUPERBLOCK>. | ||
| 108 | ;; TODO: Use "packed structs" from Guile-OpenGL or similar. | ||
| 109 | (define-syntax %ext2-sblock-magic (identifier-syntax 56)) | ||
| 110 | (define-syntax %ext2-sblock-creator-os (identifier-syntax 72)) | ||
| 111 | (define-syntax %ext2-sblock-uuid (identifier-syntax 104)) | ||
| 112 | (define-syntax %ext2-sblock-volume-name (identifier-syntax 120)) | ||
| 113 | |||
| 114 | (define (read-ext2-superblock device) | ||
| 115 | "Return the raw contents of DEVICE's ext2 superblock as a bytevector, or #f | ||
| 116 | if DEVICE does not contain an ext2 file system." | ||
| 117 | (define %ext2-magic | ||
| 118 | ;; The magic bytes that identify an ext2 file system. | ||
| 119 | #xef53) | ||
| 120 | |||
| 121 | (define superblock-size | ||
| 122 | ;; Size of the interesting part of an ext2 superblock. | ||
| 123 | 264) | ||
| 124 | |||
| 125 | (define block | ||
| 126 | ;; The superblock contents. | ||
| 127 | (make-bytevector superblock-size)) | ||
| 128 | |||
| 129 | (call-with-input-file device | ||
| 130 | (lambda (port) | ||
| 131 | (seek port 1024 SEEK_SET) | ||
| 132 | |||
| 133 | ;; Note: work around <http://bugs.gnu.org/17466>. | ||
| 134 | (and (eqv? superblock-size (get-bytevector-n! port block 0 | ||
| 135 | superblock-size)) | ||
| 136 | (let ((magic (bytevector-u16-ref block %ext2-sblock-magic | ||
| 137 | %ext2-endianness))) | ||
| 138 | (and (= magic %ext2-magic) | ||
| 139 | block)))))) | ||
| 140 | |||
| 141 | (define (ext2-superblock-uuid sblock) | ||
| 142 | "Return the UUID of ext2 superblock SBLOCK as a 16-byte bytevector." | ||
| 143 | (let ((uuid (make-bytevector 16))) | ||
| 144 | (bytevector-copy! sblock %ext2-sblock-uuid uuid 0 16) | ||
| 145 | uuid)) | ||
| 146 | |||
| 147 | (define (ext2-superblock-volume-name sblock) | ||
| 148 | "Return the volume name of SBLOCK as a string of at most 16 characters, or | ||
| 149 | #f if SBLOCK has no volume name." | ||
| 150 | (let ((bv (make-bytevector 16))) | ||
| 151 | (bytevector-copy! sblock %ext2-sblock-volume-name bv 0 16) | ||
| 152 | |||
| 153 | ;; This is a Latin-1, nul-terminated string. | ||
| 154 | (let ((bytes (take-while (negate zero?) (bytevector->u8-list bv)))) | ||
| 155 | (if (null? bytes) | ||
| 156 | #f | ||
| 157 | (list->string (map integer->char bytes)))))) | ||
| 158 | |||
| 159 | (define (disk-partitions) | ||
| 160 | "Return the list of device names corresponding to valid disk partitions." | ||
| 161 | (define (partition? major minor) | ||
| 162 | (let ((marker (format #f "/sys/dev/block/~a:~a/partition" major minor))) | ||
| 163 | (catch 'system-error | ||
| 164 | (lambda () | ||
| 165 | (not (zero? (call-with-input-file marker read)))) | ||
| 166 | (lambda args | ||
| 167 | (if (= ENOENT (system-error-errno args)) | ||
| 168 | #f | ||
| 169 | (apply throw args)))))) | ||
| 170 | |||
| 171 | (call-with-input-file "/proc/partitions" | ||
| 172 | (lambda (port) | ||
| 173 | ;; Skip the two header lines. | ||
| 174 | (read-line port) | ||
| 175 | (read-line port) | ||
| 176 | |||
| 177 | ;; Read each subsequent line, and extract the last space-separated | ||
| 178 | ;; field. | ||
| 179 | (let loop ((parts '())) | ||
| 180 | (let ((line (read-line port))) | ||
| 181 | (if (eof-object? line) | ||
| 182 | (reverse parts) | ||
| 183 | (match (string-tokenize line) | ||
| 184 | (((= string->number major) (= string->number minor) | ||
| 185 | blocks name) | ||
| 186 | (if (partition? major minor) | ||
| 187 | (loop (cons name parts)) | ||
| 188 | (loop parts)))))))))) | ||
| 189 | |||
| 190 | (define (partition-label-predicate label) | ||
| 191 | "Return a procedure that, when applied to a partition name such as \"sda1\", | ||
| 192 | return #t if that partition's volume name is LABEL." | ||
| 193 | (lambda (part) | ||
| 194 | (let* ((device (string-append "/dev/" part)) | ||
| 195 | (sblock (catch 'system-error | ||
| 196 | (lambda () | ||
| 197 | (read-ext2-superblock device)) | ||
| 198 | (lambda args | ||
| 199 | ;; When running on the hand-made /dev, | ||
| 200 | ;; 'disk-partitions' could return partitions for which | ||
| 201 | ;; we have no /dev node. Handle that gracefully. | ||
| 202 | (if (= ENOENT (system-error-errno args)) | ||
| 203 | (begin | ||
| 204 | (format (current-error-port) | ||
| 205 | "warning: device '~a' not found~%" | ||
| 206 | device) | ||
| 207 | #f) | ||
| 208 | (apply throw args)))))) | ||
| 209 | (and sblock | ||
| 210 | (let ((volume (ext2-superblock-volume-name sblock))) | ||
| 211 | (and volume | ||
| 212 | (string=? volume label))))))) | ||
| 213 | |||
| 214 | (define (find-partition-by-label label) | ||
| 215 | "Return the first partition found whose volume name is LABEL, or #f if none | ||
| 216 | were found." | ||
| 217 | (and=> (find (partition-label-predicate label) | ||
| 218 | (disk-partitions)) | ||
| 219 | (cut string-append "/dev/" <>))) | ||
| 220 | |||
| 221 | (define* (canonicalize-device-spec spec #:optional (title 'any)) | ||
| 222 | "Return the device name corresponding to SPEC. TITLE is a symbol, one of | ||
| 223 | the following: | ||
| 224 | |||
| 225 | • 'device', in which case SPEC is known to designate a device node--e.g., | ||
| 226 | \"/dev/sda1\"; | ||
| 227 | • 'label', in which case SPEC is known to designate a partition label--e.g., | ||
| 228 | \"my-root-part\"; | ||
| 229 | • 'any', in which case SPEC can be anything. | ||
| 230 | " | ||
| 231 | (define max-trials | ||
| 232 | ;; Number of times we retry partition label resolution, 1 second per | ||
| 233 | ;; trial. Note: somebody reported a delay of 16 seconds (!) before their | ||
| 234 | ;; USB key would be detected by the kernel, so we must wait for at least | ||
| 235 | ;; this long. | ||
| 236 | 20) | ||
| 237 | |||
| 238 | (define canonical-title | ||
| 239 | ;; The realm of canonicalization. | ||
| 240 | (if (eq? title 'any) | ||
| 241 | (if (string-prefix? "/" spec) | ||
| 242 | 'device | ||
| 243 | 'label) | ||
| 244 | title)) | ||
| 245 | |||
| 246 | (case canonical-title | ||
| 247 | ((device) | ||
| 248 | ;; Nothing to do. | ||
| 249 | spec) | ||
| 250 | ((label) | ||
| 251 | ;; Resolve the label. | ||
| 252 | (let loop ((count 0)) | ||
| 253 | (let ((device (find-partition-by-label spec))) | ||
| 254 | (or device | ||
| 255 | ;; Some devices take a bit of time to appear, most notably USB | ||
| 256 | ;; storage devices. Thus, wait for the device to appear. | ||
| 257 | (if (> count max-trials) | ||
| 258 | (error "failed to resolve partition label" spec) | ||
| 259 | (begin | ||
| 260 | (format #t "waiting for partition '~a' to appear...~%" | ||
| 261 | spec) | ||
| 262 | (sleep 1) | ||
| 263 | (loop (+ 1 count)))))))) | ||
| 264 | ;; TODO: Add support for UUIDs. | ||
| 265 | (else | ||
| 266 | (error "unknown device title" title)))) | ||
| 267 | |||
| 268 | (define* (make-disk-device-nodes base major #:optional (minor 0)) | ||
| 269 | "Make the block device nodes around BASE (something like \"/root/dev/sda\") | ||
| 270 | with the given MAJOR number, starting with MINOR." | ||
| 271 | (mknod base 'block-special #o644 (device-number major minor)) | ||
| 272 | (let loop ((i 1)) | ||
| 273 | (when (< i 6) | ||
| 274 | (mknod (string-append base (number->string i)) | ||
| 275 | 'block-special #o644 (device-number major (+ minor i))) | ||
| 276 | (loop (+ i 1))))) | ||
| 277 | |||
| 278 | (define* (make-essential-device-nodes #:key (root "/")) | ||
| 279 | "Make essential device nodes under ROOT/dev." | ||
| 280 | ;; The hand-made udev! | ||
| 281 | |||
| 282 | (define (scope dir) | ||
| 283 | (string-append root | ||
| 284 | (if (string-suffix? "/" root) | ||
| 285 | "" | ||
| 286 | "/") | ||
| 287 | dir)) | ||
| 288 | |||
| 289 | (unless (file-exists? (scope "dev")) | ||
| 290 | (mkdir (scope "dev"))) | ||
| 291 | |||
| 292 | ;; Make the device nodes for SCSI disks. | ||
| 293 | (make-disk-device-nodes (scope "dev/sda") 8) | ||
| 294 | (make-disk-device-nodes (scope "dev/sdb") 8 16) | ||
| 295 | (make-disk-device-nodes (scope "dev/sdc") 8 32) | ||
| 296 | (make-disk-device-nodes (scope "dev/sdd") 8 48) | ||
| 297 | |||
| 298 | ;; SCSI CD-ROM devices (aka. "/dev/sr0" etc.). | ||
| 299 | (mknod (scope "dev/scd0") 'block-special #o644 (device-number 11 0)) | ||
| 300 | (mknod (scope "dev/scd1") 'block-special #o644 (device-number 11 1)) | ||
| 301 | |||
| 302 | ;; The virtio (para-virtualized) block devices, as supported by QEMU/KVM. | ||
| 303 | (make-disk-device-nodes (scope "dev/vda") 252) | ||
| 304 | |||
| 305 | ;; Memory (used by Xorg's VESA driver.) | ||
| 306 | (mknod (scope "dev/mem") 'char-special #o640 (device-number 1 1)) | ||
| 307 | (mknod (scope "dev/kmem") 'char-special #o640 (device-number 1 2)) | ||
| 308 | |||
| 309 | ;; Inputs (used by Xorg.) | ||
| 310 | (unless (file-exists? (scope "dev/input")) | ||
| 311 | (mkdir (scope "dev/input"))) | ||
| 312 | (mknod (scope "dev/input/mice") 'char-special #o640 (device-number 13 63)) | ||
| 313 | (mknod (scope "dev/input/mouse0") 'char-special #o640 (device-number 13 32)) | ||
| 314 | (mknod (scope "dev/input/event0") 'char-special #o640 (device-number 13 64)) | ||
| 315 | |||
| 316 | ;; System console. This node is magically created by the kernel on the | ||
| 317 | ;; initrd's root, so don't try to create it in that case. | ||
| 318 | (unless (string=? root "/") | ||
| 319 | (mknod (scope "dev/console") 'char-special #o600 | ||
| 320 | (device-number 5 1))) | ||
| 321 | |||
| 322 | ;; TTYs. | ||
| 323 | (mknod (scope "dev/tty") 'char-special #o600 | ||
| 324 | (device-number 5 0)) | ||
| 325 | (chmod (scope "dev/tty") #o666) | ||
| 326 | (let loop ((n 0)) | ||
| 327 | (and (< n 50) | ||
| 328 | (let ((name (format #f "dev/tty~a" n))) | ||
| 329 | (mknod (scope name) 'char-special #o600 | ||
| 330 | (device-number 4 n)) | ||
| 331 | (loop (+ 1 n))))) | ||
| 332 | |||
| 333 | ;; Serial line. | ||
| 334 | (mknod (scope "dev/ttyS0") 'char-special #o660 | ||
| 335 | (device-number 4 64)) | ||
| 336 | |||
| 337 | ;; Pseudo ttys. | ||
| 338 | (mknod (scope "dev/ptmx") 'char-special #o666 | ||
| 339 | (device-number 5 2)) | ||
| 340 | (chmod (scope "dev/ptmx") #o666) | ||
| 341 | |||
| 342 | ;; Create /dev/pts; it will be mounted later, at boot time. | ||
| 343 | (unless (file-exists? (scope "dev/pts")) | ||
| 344 | (mkdir (scope "dev/pts"))) | ||
| 345 | |||
| 346 | ;; Rendez-vous point for syslogd. | ||
| 347 | (mknod (scope "dev/log") 'socket #o666 0) | ||
| 348 | (mknod (scope "dev/kmsg") 'char-special #o600 (device-number 1 11)) | ||
| 349 | |||
| 350 | ;; Other useful nodes, notably relied on by guix-daemon. | ||
| 351 | (for-each (match-lambda | ||
| 352 | ((file major minor) | ||
| 353 | (mknod (scope file) 'char-special #o666 | ||
| 354 | (device-number major minor)) | ||
| 355 | (chmod (scope file) #o666))) | ||
| 356 | '(("dev/null" 1 3) | ||
| 357 | ("dev/zero" 1 5) | ||
| 358 | ("dev/full" 1 7) | ||
| 359 | ("dev/random" 1 8) | ||
| 360 | ("dev/urandom" 1 9))) | ||
| 361 | |||
| 362 | (symlink "/proc/self/fd" (scope "dev/fd")) | ||
| 363 | (symlink "/proc/self/fd/0" (scope "dev/stdin")) | ||
| 364 | (symlink "/proc/self/fd/1" (scope "dev/stdout")) | ||
| 365 | (symlink "/proc/self/fd/2" (scope "dev/stderr")) | ||
| 366 | |||
| 367 | ;; Loopback devices. | ||
| 368 | (let loop ((i 0)) | ||
| 369 | (when (< i 8) | ||
| 370 | (mknod (scope (string-append "dev/loop" (number->string i))) | ||
| 371 | 'block-special #o660 | ||
| 372 | (device-number 7 i)) | ||
| 373 | (loop (+ 1 i)))) | ||
| 374 | |||
| 375 | ;; File systems in user space (FUSE). | ||
| 376 | (mknod (scope "dev/fuse") 'char-special #o666 (device-number 10 229))) | ||
| 377 | |||
| 378 | (define %host-qemu-ipv4-address | ||
| 379 | (inet-pton AF_INET "10.0.2.10")) | ||
| 380 | |||
| 381 | (define* (configure-qemu-networking #:optional (interface "eth0")) | ||
| 382 | "Setup the INTERFACE network interface and /etc/resolv.conf according to | ||
| 383 | QEMU's default networking settings (see net/slirp.c in QEMU for default | ||
| 384 | networking values.) Return #t if INTERFACE is up, #f otherwise." | ||
| 385 | (display "configuring QEMU networking...\n") | ||
| 386 | (let* ((sock (socket AF_INET SOCK_STREAM 0)) | ||
| 387 | (address (make-socket-address AF_INET %host-qemu-ipv4-address 0)) | ||
| 388 | (flags (network-interface-flags sock interface))) | ||
| 389 | (set-network-interface-address sock interface address) | ||
| 390 | (set-network-interface-flags sock interface (logior flags IFF_UP)) | ||
| 391 | |||
| 392 | ;; Hello! We used to create /etc/resolv.conf here, with "nameserver | ||
| 393 | ;; 10.0.2.3\n". However, with Linux-libre 3.16, we're getting ENOSPC. | ||
| 394 | ;; And since it's actually unnecessary, it's gone. | ||
| 395 | |||
| 396 | (logand (network-interface-flags sock interface) IFF_UP))) | ||
| 397 | |||
| 398 | ;; Linux mount flags, from libc's <sys/mount.h>. | ||
| 399 | (define MS_RDONLY 1) | ||
| 400 | (define MS_NOSUID 2) | ||
| 401 | (define MS_NODEV 4) | ||
| 402 | (define MS_NOEXEC 8) | ||
| 403 | (define MS_BIND 4096) | ||
| 404 | (define MS_MOVE 8192) | ||
| 405 | |||
| 406 | (define (bind-mount source target) | ||
| 407 | "Bind-mount SOURCE at TARGET." | ||
| 408 | (mount source target "" MS_BIND)) | ||
| 409 | |||
| 410 | (define (load-linux-module* file) | ||
| 411 | "Load Linux module from FILE, the name of a `.ko' file." | ||
| 412 | (define (slurp module) | ||
| 413 | (call-with-input-file file get-bytevector-all)) | ||
| 414 | |||
| 415 | (load-linux-module (slurp file))) | ||
| 416 | |||
| 417 | (define (device-number major minor) | ||
| 418 | "Return the device number for the device with MAJOR and MINOR, for use as | ||
| 419 | the last argument of `mknod'." | ||
| 420 | (+ (* major 256) minor)) | ||
| 421 | |||
| 422 | (define (pidof program) | ||
| 423 | "Return the PID of the first presumed instance of PROGRAM." | ||
| 424 | (let ((program (basename program))) | ||
| 425 | (find (lambda (pid) | ||
| 426 | (let ((exe (format #f "/proc/~a/exe" pid))) | ||
| 427 | (and=> (false-if-exception (readlink exe)) | ||
| 428 | (compose (cut string=? program <>) basename)))) | ||
| 429 | (filter-map string->number (scandir "/proc"))))) | ||
| 430 | |||
| 431 | (define* (mount-root-file-system root type | ||
| 432 | #:key volatile-root? (unionfs "unionfs")) | ||
| 433 | "Mount the root file system of type TYPE at device ROOT. If VOLATILE-ROOT? | ||
| 434 | is true, mount ROOT read-only and make it a union with a writable tmpfs using | ||
| 435 | UNIONFS." | ||
| 436 | (define (mark-as-not-killable pid) | ||
| 437 | ;; Tell the 'user-processes' dmd service that PID must be kept alive when | ||
| 438 | ;; shutting down. | ||
| 439 | (mkdir-p "/root/etc/dmd") | ||
| 440 | (let ((port (open-file "/root/etc/dmd/do-not-kill" "a"))) | ||
| 441 | (chmod port #o600) | ||
| 442 | (write pid port) | ||
| 443 | (newline port) | ||
| 444 | (close-port port))) | ||
| 445 | |||
| 446 | (catch #t | ||
| 447 | (lambda () | ||
| 448 | (if volatile-root? | ||
| 449 | (begin | ||
| 450 | (mkdir-p "/real-root") | ||
| 451 | (mount root "/real-root" type MS_RDONLY) | ||
| 452 | (mkdir-p "/rw-root") | ||
| 453 | (mount "none" "/rw-root" "tmpfs") | ||
| 454 | |||
| 455 | ;; We want read-write /dev nodes. | ||
| 456 | (make-essential-device-nodes #:root "/rw-root") | ||
| 457 | |||
| 458 | ;; Make /root a union of the tmpfs and the actual root. Use | ||
| 459 | ;; 'max_files' to set a high RLIMIT_NOFILE for the unionfs process | ||
| 460 | ;; itself. Failing to do that, we quickly run out of file | ||
| 461 | ;; descriptors; see <http://bugs.gnu.org/17827>. | ||
| 462 | (unless (zero? (system* unionfs "-o" | ||
| 463 | "cow,allow_other,use_ino,suid,dev,max_files=65536" | ||
| 464 | "/rw-root=RW:/real-root=RO" | ||
| 465 | "/root")) | ||
| 466 | (error "unionfs failed")) | ||
| 467 | |||
| 468 | ;; Make sure unionfs remains alive till the end. Because | ||
| 469 | ;; 'fuse_daemonize' doesn't tell the PID of the forked daemon, we | ||
| 470 | ;; have to resort to 'pidof' here. | ||
| 471 | (mark-as-not-killable (pidof unionfs))) | ||
| 472 | (begin | ||
| 473 | (check-file-system root type) | ||
| 474 | (mount root "/root" type)))) | ||
| 475 | (lambda args | ||
| 476 | (format (current-error-port) "exception while mounting '~a': ~s~%" | ||
| 477 | root args) | ||
| 478 | (start-repl))) | ||
| 479 | |||
| 480 | (copy-file "/proc/mounts" "/root/etc/mtab")) | ||
| 481 | |||
| 482 | (define (check-file-system device type) | ||
| 483 | "Run a file system check of TYPE on DEVICE." | ||
| 484 | (define fsck | ||
| 485 | (string-append "fsck." type)) | ||
| 486 | |||
| 487 | (let ((status (system* fsck "-v" "-p" device))) | ||
| 488 | (match (status:exit-val status) | ||
| 489 | (0 | ||
| 490 | #t) | ||
| 491 | (1 | ||
| 492 | (format (current-error-port) "'~a' corrected errors on ~a; continuing~%" | ||
| 493 | fsck device)) | ||
| 494 | (2 | ||
| 495 | (format (current-error-port) "'~a' corrected errors on ~a; rebooting~%" | ||
| 496 | fsck device) | ||
| 497 | (sleep 3) | ||
| 498 | (reboot)) | ||
| 499 | (code | ||
| 500 | (format (current-error-port) "'~a' exited with code ~a on ~a; spawning REPL~%" | ||
| 501 | fsck code device) | ||
| 502 | (start-repl))))) | ||
| 503 | |||
| 504 | (define (mount-flags->bit-mask flags) | ||
| 505 | "Return the number suitable for the 'flags' argument of 'mount' that | ||
| 506 | corresponds to the symbols listed in FLAGS." | ||
| 507 | (let loop ((flags flags)) | ||
| 508 | (match flags | ||
| 509 | (('read-only rest ...) | ||
| 510 | (logior MS_RDONLY (loop rest))) | ||
| 511 | (('bind-mount rest ...) | ||
| 512 | (logior MS_BIND (loop rest))) | ||
| 513 | (('no-suid rest ...) | ||
| 514 | (logior MS_NOSUID (loop rest))) | ||
| 515 | (('no-dev rest ...) | ||
| 516 | (logior MS_NODEV (loop rest))) | ||
| 517 | (('no-exec rest ...) | ||
| 518 | (logior MS_NOEXEC (loop rest))) | ||
| 519 | (() | ||
| 520 | 0)))) | ||
| 521 | |||
| 522 | (define* (mount-file-system spec #:key (root "/root")) | ||
| 523 | "Mount the file system described by SPEC under ROOT. SPEC must have the | ||
| 524 | form: | ||
| 525 | |||
| 526 | (DEVICE TITLE MOUNT-POINT TYPE (FLAGS ...) OPTIONS CHECK?) | ||
| 527 | |||
| 528 | DEVICE, MOUNT-POINT, and TYPE must be strings; OPTIONS can be a string or #f; | ||
| 529 | FLAGS must be a list of symbols. CHECK? is a Boolean indicating whether to | ||
| 530 | run a file system check." | ||
| 531 | (match spec | ||
| 532 | ((source title mount-point type (flags ...) options check?) | ||
| 533 | (let ((source (canonicalize-device-spec source title)) | ||
| 534 | (mount-point (string-append root "/" mount-point))) | ||
| 535 | (when check? | ||
| 536 | (check-file-system source type)) | ||
| 537 | (mkdir-p mount-point) | ||
| 538 | (mount source mount-point type (mount-flags->bit-mask flags) | ||
| 539 | (if options | ||
| 540 | (string->pointer options) | ||
| 541 | %null-pointer)) | ||
| 542 | |||
| 543 | ;; Update /etc/mtab. | ||
| 544 | (mkdir-p (string-append root "/etc")) | ||
| 545 | (let ((port (open-file (string-append root "/etc/mtab") "a"))) | ||
| 546 | (format port "~a ~a ~a ~a 0 0~%" | ||
| 547 | source mount-point type (or options "")) | ||
| 548 | (close-port port)))))) | ||
| 549 | |||
| 550 | (define (switch-root root) | ||
| 551 | "Switch to ROOT as the root file system, in a way similar to what | ||
| 552 | util-linux' switch_root(8) does." | ||
| 553 | (move-essential-file-systems root) | ||
| 554 | (chdir root) | ||
| 555 | |||
| 556 | ;; Since we're about to 'rm -rf /', try to make sure we're on an initrd. | ||
| 557 | ;; TODO: Use 'statfs' to check the fs type, like klibc does. | ||
| 558 | (when (or (not (file-exists? "/init")) (directory-exists? "/home")) | ||
| 559 | (format (current-error-port) | ||
| 560 | "The root file system is probably not an initrd; \ | ||
| 561 | bailing out.~%root contents: ~s~%" (scandir "/")) | ||
| 562 | (force-output (current-error-port)) | ||
| 563 | (exit 1)) | ||
| 564 | |||
| 565 | ;; Delete files from the old root, without crossing mount points (assuming | ||
| 566 | ;; there are no mount points in sub-directories.) That means we're leaving | ||
| 567 | ;; the empty ROOT directory behind us, but that's OK. | ||
| 568 | (let ((root-device (stat:dev (stat "/")))) | ||
| 569 | (for-each (lambda (file) | ||
| 570 | (unless (member file '("." "..")) | ||
| 571 | (let* ((file (string-append "/" file)) | ||
| 572 | (device (stat:dev (lstat file)))) | ||
| 573 | (when (= device root-device) | ||
| 574 | (delete-file-recursively file))))) | ||
| 575 | (scandir "/"))) | ||
| 576 | |||
| 577 | ;; Make ROOT the new root. | ||
| 578 | (mount root "/" "" MS_MOVE) | ||
| 579 | (chroot ".") | ||
| 580 | (chdir "/") | ||
| 581 | |||
| 582 | (when (file-exists? "/dev/console") | ||
| 583 | ;; Close the standard file descriptors since they refer to the old | ||
| 584 | ;; /dev/console, and reopen them. | ||
| 585 | (let ((console (open-file "/dev/console" "r+b0"))) | ||
| 586 | (for-each close-fdes '(0 1 2)) | ||
| 587 | |||
| 588 | (dup2 (fileno console) 0) | ||
| 589 | (dup2 (fileno console) 1) | ||
| 590 | (dup2 (fileno console) 2) | ||
| 591 | |||
| 592 | (close-port console)))) | ||
| 593 | |||
| 594 | |||
| 595 | (define* (boot-system #:key | ||
| 596 | (linux-modules '()) | ||
| 597 | qemu-guest-networking? | ||
| 598 | guile-modules-in-chroot? | ||
| 599 | volatile-root? | ||
| 600 | (mounts '())) | ||
| 601 | "This procedure is meant to be called from an initrd. Boot a system by | ||
| 602 | first loading LINUX-MODULES, then setting up QEMU guest networking if | ||
| 603 | QEMU-GUEST-NETWORKING? is true, mounting the file systems specified in MOUNTS, | ||
| 604 | and finally booting into the new root if any. The initrd supports kernel | ||
| 605 | command-line options '--load', '--root', and '--repl'. | ||
| 606 | |||
| 607 | Mount the root file system, specified by the '--root' command-line argument, | ||
| 608 | if any. | ||
| 609 | |||
| 610 | MOUNTS must be a list suitable for 'mount-file-system'. | ||
| 611 | |||
| 612 | When GUILE-MODULES-IN-CHROOT? is true, make core Guile modules available in | ||
| 613 | the new root. | ||
| 614 | |||
| 615 | When VOLATILE-ROOT? is true, the root file system is writable but any changes | ||
| 616 | to it are lost." | ||
| 617 | (define root-mount-point? | ||
| 618 | (match-lambda | ||
| 619 | ((device _ "/" _ ...) #t) | ||
| 620 | (_ #f))) | ||
| 621 | |||
| 622 | (define root-fs-type | ||
| 623 | (or (any (match-lambda | ||
| 624 | ((device _ "/" type _ ...) type) | ||
| 625 | (_ #f)) | ||
| 626 | mounts) | ||
| 627 | "ext4")) | ||
| 628 | |||
| 629 | (display "Welcome, this is GNU's early boot Guile.\n") | ||
| 630 | (display "Use '--repl' for an initrd REPL.\n\n") | ||
| 631 | |||
| 632 | (call-with-error-handling | ||
| 633 | (lambda () | ||
| 634 | (mount-essential-file-systems) | ||
| 635 | (let* ((args (linux-command-line)) | ||
| 636 | (to-load (find-long-option "--load" args)) | ||
| 637 | (root (find-long-option "--root" args))) | ||
| 638 | |||
| 639 | (when (member "--repl" args) | ||
| 640 | (start-repl)) | ||
| 641 | |||
| 642 | (display "loading kernel modules...\n") | ||
| 643 | (for-each (compose load-linux-module* | ||
| 644 | (cut string-append "/modules/" <>)) | ||
| 645 | linux-modules) | ||
| 646 | |||
| 647 | (when qemu-guest-networking? | ||
| 648 | (unless (configure-qemu-networking) | ||
| 649 | (display "network interface is DOWN\n"))) | ||
| 650 | |||
| 651 | ;; Make /dev nodes. | ||
| 652 | (make-essential-device-nodes) | ||
| 653 | |||
| 654 | ;; Prepare the real root file system under /root. | ||
| 655 | (unless (file-exists? "/root") | ||
| 656 | (mkdir "/root")) | ||
| 657 | (if root | ||
| 658 | (mount-root-file-system (canonicalize-device-spec root) | ||
| 659 | root-fs-type | ||
| 660 | #:volatile-root? volatile-root?) | ||
| 661 | (mount "none" "/root" "tmpfs")) | ||
| 662 | |||
| 663 | (unless (file-exists? "/root/dev") | ||
| 664 | (mkdir "/root/dev") | ||
| 665 | (make-essential-device-nodes #:root "/root")) | ||
| 666 | |||
| 667 | ;; Mount the specified file systems. | ||
| 668 | (for-each mount-file-system | ||
| 669 | (remove root-mount-point? mounts)) | ||
| 670 | |||
| 671 | (when guile-modules-in-chroot? | ||
| 672 | ;; Copy the directories that contain .scm and .go files so that the | ||
| 673 | ;; child process in the chroot can load modules (we would bind-mount | ||
| 674 | ;; them but for some reason that fails with EINVAL -- XXX). | ||
| 675 | (mkdir-p "/root/share") | ||
| 676 | (mkdir-p "/root/lib") | ||
| 677 | (mount "none" "/root/share" "tmpfs") | ||
| 678 | (mount "none" "/root/lib" "tmpfs") | ||
| 679 | (copy-recursively "/share" "/root/share" | ||
| 680 | #:log (%make-void-port "w")) | ||
| 681 | (copy-recursively "/lib" "/root/lib" | ||
| 682 | #:log (%make-void-port "w"))) | ||
| 683 | |||
| 684 | (if to-load | ||
| 685 | (begin | ||
| 686 | (switch-root "/root") | ||
| 687 | (format #t "loading '~a'...\n" to-load) | ||
| 688 | |||
| 689 | ;; TODO: Remove /lib, /share, and /loader.go. | ||
| 690 | (primitive-load to-load) | ||
| 691 | |||
| 692 | (format (current-error-port) | ||
| 693 | "boot program '~a' terminated, rebooting~%" | ||
| 694 | to-load) | ||
| 695 | (sleep 2) | ||
| 696 | (reboot)) | ||
| 697 | (begin | ||
| 698 | (display "no boot file passed via '--load'\n") | ||
| 699 | (display "entering a warm and cozy REPL\n") | ||
| 700 | (start-repl))))))) | ||
| 701 | |||
| 702 | ;;; linux-initrd.scm ends here | ||
