aboutsummaryrefslogtreecommitdiff
path: root/gnu/system/vm.scm
blob: 64d778b6022fd3d3420ef7e2442bb393ecbc5fa2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013 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 system vm)
  #:use-module (guix config)
  #:use-module (guix store)
  #:use-module (guix derivations)
  #:use-module (guix packages)
  #:use-module ((gnu packages base) #:select (%final-inputs
                                              guile-final
                                              coreutils))
  #:use-module (gnu packages guile)
  #:use-module (gnu packages bash)
  #:use-module (gnu packages qemu)
  #:use-module (gnu packages parted)
  #:use-module (gnu packages grub)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages linux-initrd)
  #:use-module (gnu packages package-management)
  #:use-module ((gnu packages make-bootstrap)
                #:select (%guile-static-stripped))
  #:use-module (gnu packages system)

  #:use-module (gnu system shadow)
  #:use-module (gnu system linux)
  #:use-module (gnu system grub)
  #:use-module (gnu system dmd)

  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (ice-9 match)

  #:export (expression->derivation-in-linux-vm
            qemu-image
            system-qemu-image))


;;; Commentary:
;;;
;;; Tools to evaluate build expressions within virtual machines.
;;;
;;; Code:

(define* (expression->derivation-in-linux-vm store name exp
                                             #:key
                                             (system (%current-system))
                                             (inputs '())
                                             (linux linux-libre)
                                             (initrd qemu-initrd)
                                             (qemu qemu/smb-shares)
                                             (env-vars '())
                                             (modules '())
                                             (guile-for-build
                                              (%guile-for-build))

                                             (make-disk-image? #f)
                                             (references-graphs #f)
                                             (disk-image-size
                                              (* 100 (expt 2 20))))
  "Evaluate EXP in a QEMU virtual machine running LINUX with INITRD.  In the
virtual machine, EXP has access to all of INPUTS from the store; it should put
its output files in the `/xchg' directory, which is copied to the derivation's
output when the VM terminates.

When MAKE-DISK-IMAGE? is true, then create a QEMU disk image of
DISK-IMAGE-SIZE bytes and return it.

When REFERENCES-GRAPHS is true, it must be a list of file name/store path
pairs, as for `derivation'.  The files containing the reference graphs are
made available under the /xchg CIFS share."
  ;; FIXME: Allow use of macros from other modules, as done in
  ;; `build-expression->derivation'.

  (define input-alist
    (map (match-lambda
          ((input (? package? package))
           `(,input . ,(package-output store package "out" system)))
          ((input (? package? package) sub-drv)
           `(,input . ,(package-output store package sub-drv system)))
          ((input (and (? string?) (? store-path?) file))
           `(,input . ,file)))
         inputs))

  (define exp*
    ;; EXP, but with INPUTS available.
    `(let ((%build-inputs ',input-alist))
       ,exp))

  (define builder
    ;; Code that launches the VM that evaluates EXP.
    `(let ()
       (use-modules (guix build utils)
                    (srfi srfi-1)
                    (ice-9 rdelim))

       (let ((out     (assoc-ref %outputs "out"))
             (cu      (string-append (assoc-ref %build-inputs "coreutils")
                                     "/bin"))
             (qemu    (string-append (assoc-ref %build-inputs "qemu")
                                     "/bin/qemu-system-"
                                     (car (string-split ,system #\-))))
             (img     (string-append (assoc-ref %build-inputs "qemu")
                                     "/bin/qemu-img"))
             (linux   (string-append (assoc-ref %build-inputs "linux")
                                     "/bzImage"))
             (initrd  (string-append (assoc-ref %build-inputs "initrd")
                                     "/initrd"))
             (builder (assoc-ref %build-inputs "builder")))

         ;; XXX: QEMU uses "rm -rf" when it's done to remove the temporary SMB
         ;; directory, so it really needs `rm' in $PATH.
         (setenv "PATH" cu)

         ,(if make-disk-image?
              `(zero? (system* img "create" "image.qcow2"
                               ,(number->string disk-image-size)))
              '(begin))

         (mkdir "xchg")

         ;; Copy the reference-graph files under xchg/ so EXP can access it.
         (begin
           ,@(match references-graphs
               (((graph-files . _) ...)
                (map (lambda (file)
                       `(copy-file ,file
                                   ,(string-append "xchg/" file)))
                     graph-files))
               (#f '())))

         (and (zero?
               (system* qemu "-nographic" "-no-reboot"
                        "-net" "nic,model=e1000"
                        "-net" (string-append "user,smb=" (getcwd))
                        "-kernel" linux
                        "-initrd" initrd
                        "-append" (string-append "console=ttyS0 --load="
                                                 builder)
                        ,@(if make-disk-image?
                              '("-hda" "image.qcow2")
                              '())))
              ,(if make-disk-image?
                   '(copy-file "image.qcow2"      ; XXX: who mkdir'd OUT?
                               out)
                   '(begin
                      (mkdir out)
                      (copy-recursively "xchg" out)))))))

  (let ((user-builder (add-text-to-store store "builder-in-linux-vm"
                                         (object->string exp*)
                                         '()))
        (->drv        (cut package-derivation store <> system))
        (coreutils    (car (assoc-ref %final-inputs "coreutils"))))
    (build-expression->derivation store name system builder
                                  `(("qemu" ,(->drv qemu))
                                    ("linux" ,(->drv linux))
                                    ("initrd" ,(->drv initrd))
                                    ("coreutils" ,(->drv coreutils))
                                    ("builder" ,user-builder)
                                    ,@(map (match-lambda
                                            ((name (? package? package)
                                                   sub-drv ...)
                                             `(,name ,(->drv package)
                                                     ,@sub-drv))
                                            ((name (? string? file))
                                             `(,name ,file)))
                                           inputs))
                                  #:env-vars env-vars
                                  #:modules (delete-duplicates
                                             `((guix build utils)
                                               ,@modules))
                                  #:guile-for-build guile-for-build
                                  #:references-graphs references-graphs)))

(define* (qemu-image store #:key
                     (name "qemu-image")
                     (system (%current-system))
                     (disk-image-size (* 100 (expt 2 20)))
                     grub-configuration
                     (initialize-store? #f)
                     (populate #f)
                     (inputs '())
                     (inputs-to-copy '()))
  "Return a bootable, stand-alone QEMU image.  The returned image is a full
disk image, with a GRUB installation that uses GRUB-CONFIGURATION as its
configuration file.

INPUTS-TO-COPY is a list of inputs (as for packages) whose closure is copied
into the image being built.  When INITIALIZE-STORE? is true, initialize the
store database in the image so that Guix can be used in the image.

When POPULATE is true, it must be the store file name of a Guile script to run
in the disk image partition once it has been populated with INPUTS-TO-COPY.
It can be used to provide additional files, such as /etc files."
  (define input->name+derivation
    (match-lambda
     ((name (? package? package))
      `(,name . ,(derivation->output-path
                  (package-derivation store package system))))
     ((name (? package? package) sub-drv)
      `(,name . ,(derivation->output-path
                  (package-derivation store package system)
                  sub-drv)))
     ((input (and (? string?) (? store-path?) file))
      `(,input . ,file))))

  (expression->derivation-in-linux-vm
   store "qemu-image"
   `(let ()
      (use-modules (ice-9 rdelim)
                   (srfi srfi-1)
                   (guix build utils)
                   (guix build linux-initrd))

      (let ((parted  (string-append (assoc-ref %build-inputs "parted")
                                    "/sbin/parted"))
            (mkfs    (string-append (assoc-ref %build-inputs "e2fsprogs")
                                    "/sbin/mkfs.ext3"))
            (grub    (string-append (assoc-ref %build-inputs "grub")
                                    "/sbin/grub-install"))
            (umount  (string-append (assoc-ref %build-inputs "util-linux")
                                    "/bin/umount")) ; XXX: add to Guile
            (grub.cfg (assoc-ref %build-inputs "grub.cfg")))

        (define (read-reference-graph port)
          ;; Return a list of store paths from the reference graph at PORT.
          ;; The data at PORT is the format produced by #:references-graphs.
          (let loop ((line   (read-line port))
                     (result '()))
            (cond ((eof-object? line)
                   (delete-duplicates result))
                  ((string-prefix? "/" line)
                   (loop (read-line port)
                         (cons line result)))
                  (else
                   (loop (read-line port)
                         result)))))

        (define (things-to-copy)
          ;; Return the list of store files to copy to the image.
          (define (graph-from-file file)
            (call-with-input-file file
              read-reference-graph))

          ,(match inputs-to-copy
             (((graph-files . _) ...)
              `(let* ((graph-files ',(map (cut string-append "/xchg/" <>)
                                          graph-files))
                      (paths       (append-map graph-from-file graph-files)))
                 (delete-duplicates paths)))
             (#f ''())))

        ;; GRUB is full of shell scripts.
        (setenv "PATH"
                (string-append (dirname grub) ":"
                               (assoc-ref %build-inputs "coreutils") "/bin:"
                               (assoc-ref %build-inputs "findutils") "/bin:"
                               (assoc-ref %build-inputs "sed") "/bin:"
                               (assoc-ref %build-inputs "grep") "/bin:"
                               (assoc-ref %build-inputs "gawk") "/bin"))

        (display "creating partition table...\n")
        (and (zero? (system* parted "/dev/vda" "mklabel" "msdos"
                             "mkpart" "primary" "ext2" "1MiB"
                             ,(format #f "~aB"
                                      (- disk-image-size
                                         (* 5 (expt 2 20))))))
             (begin
               (display "creating ext3 partition...\n")
               (and (zero? (system* mkfs "-F" "/dev/vda1"))
                    (begin
                      (display "mounting partition...\n")
                      (mkdir "/fs")
                      (mount "/dev/vda1" "/fs" "ext3")
                      (mkdir-p "/fs/boot/grub")
                      (symlink grub.cfg "/fs/boot/grub/grub.cfg")

                      ;; Populate the image's store.
                      (mkdir-p (string-append "/fs" ,%store-directory))
                      (for-each (lambda (thing)
                                  (copy-recursively thing
                                                    (string-append "/fs"
                                                                   thing)))
                                (cons grub.cfg (things-to-copy)))

                      ;; Populate /dev.
                      (make-essential-device-nodes #:root "/fs")

                      ;; Optionally, register the inputs in the image's store.
                      (let* ((guix     (assoc-ref %build-inputs "guix"))
                             (register (string-append guix
                                                      "/sbin/guix-register")))
                        ,@(if initialize-store?
                              (match inputs-to-copy
                                (((graph-files . _) ...)
                                 (map (lambda (closure)
                                        `(system* register "--prefix" "/fs"
                                                  ,(string-append "/xchg/"
                                                                  closure)))
                                      graph-files)))
                              '(#f)))

                      (and=> (assoc-ref %build-inputs "populate")
                             (lambda (populate)
                               (chdir "/fs")
                               (primitive-load populate)
                               (chdir "/")))

                      (display "clearing file timestamps...\n")
                      (for-each (lambda (file)
                                  (let ((s (lstat file)))
                                    ;; XXX: Guile uses libc's 'utime' function
                                    ;; (not 'futime'), so the timestamp of
                                    ;; symlinks cannot be changed, and there
                                    ;; are symlinks here pointing to
                                    ;; /nix/store, which is the host,
                                    ;; read-only store.
                                    (unless (eq? (stat:type s) 'symlink)
                                      (utime file 0 0 0 0))))
                                (find-files "/fs" ".*"))

                      (and (zero?
                            (system* grub "--no-floppy"
                                     "--boot-directory" "/fs/boot"
                                     "/dev/vda"))
                           (zero? (system* umount "/fs"))
                           (reboot))))))))
   #:system system
   #:inputs `(("parted" ,parted)
              ("grub" ,grub)
              ("e2fsprogs" ,e2fsprogs)
              ("grub.cfg" ,grub-configuration)

              ;; For shell scripts.
              ("sed" ,(car (assoc-ref %final-inputs "sed")))
              ("grep" ,(car (assoc-ref %final-inputs "grep")))
              ("coreutils" ,(car (assoc-ref %final-inputs "coreutils")))
              ("findutils" ,(car (assoc-ref %final-inputs "findutils")))
              ("gawk" ,(car (assoc-ref %final-inputs "gawk")))
              ("util-linux" ,util-linux)

              ,@(if populate
                    `(("populate" ,populate))
                    '())

              ,@inputs-to-copy)
   #:make-disk-image? #t
   #:disk-image-size disk-image-size
   #:references-graphs (map input->name+derivation inputs-to-copy)
   #:modules '((guix build utils)
               (guix build linux-initrd))))


;;;
;;; Stand-alone VM image.
;;;

(define (system-qemu-image store)
  "Return the derivation of a QEMU image of the GNU system."
  (define %pam-services
    ;; Services known to PAM.
    (list %pam-other-services
          (unix-pam-service "login" #:allow-empty-passwords? #t)))

  (define %dmd-services
    ;; Services run by dmd.
    (list (mingetty-service store "tty1")
          (mingetty-service store "tty2")
          (mingetty-service store "tty3")
          (syslog-service store)
          (guix-service store #:guix guix-0.4)))

  (parameterize ((%guile-for-build (package-derivation store guile-final)))
    (let* ((bash-drv  (package-derivation store bash))
           (bash-file (string-append (derivation->output-path bash-drv)
                                     "/bin/bash"))
           (dmd-drv   (package-derivation store dmd))
           (dmd-file  (string-append (derivation->output-path dmd-drv)
                                     "/bin/dmd"))
           (dmd-conf  (dmd-configuration-file store %dmd-services))
           (accounts  (list (vector "root" "" 0 0 "System administrator"
                                    "/" bash-file)))
           (passwd    (passwd-file store accounts))
           (shadow    (passwd-file store accounts #:shadow? #t))
           (group     (add-text-to-store store "group"
                                         "root:x:0:\n"))
           (pam.d-drv (pam-services->directory store %pam-services))
           (pam.d     (derivation->output-path pam.d-drv))
           (populate
            (add-text-to-store store "populate-qemu-image"
                               (object->string
                                `(begin
                                   (mkdir-p "etc")
                                   (mkdir-p "var/log") ; for dmd
                                   (symlink ,shadow "etc/shadow")
                                   (symlink ,passwd "etc/passwd")
                                   (symlink ,group "etc/group")
                                   (symlink "/dev/null"
                                            "etc/login.defs")
                                   (symlink ,pam.d "etc/pam.d")
                                   (mkdir-p "var/run")))
                               (list passwd)))
           (out     (derivation->output-path
                     (package-derivation store mingetty)))
           (boot    (add-text-to-store store "boot"
                                       (object->string
                                        `(execl ,dmd-file "dmd"
                                                "--config" ,dmd-conf))
                                       (list out)))
           (entries  (list (menu-entry
                            (label "Boot-to-Guile! (GNU System technology preview)")
                            (linux linux-libre)
                            (linux-arguments `("--root=/dev/vda1"
                                               ,(string-append "--load=" boot)))
                            (initrd gnu-system-initrd))))
           (grub.cfg (grub-configuration-file store entries)))
      (build-derivations store (list pam.d-drv))
      (qemu-image store
                  #:grub-configuration grub.cfg
                  #:populate populate
                  #:disk-image-size (* 500 (expt 2 20))
                  #:initialize-store? #t
                  #:inputs-to-copy `(("boot" ,boot)
                                     ("linux" ,linux-libre)
                                     ("initrd" ,gnu-system-initrd)
                                     ("coreutils" ,coreutils)
                                     ("bash" ,bash)
                                     ("guile" ,guile-2.0)
                                     ("mingetty" ,mingetty)
                                     ("dmd" ,dmd)
                                     ("guix" ,guix-0.4)

                                     ;; Configuration.
                                     ("dmd.conf" ,dmd-conf)
                                     ("etc-pam.d" ,pam.d)
                                     ("etc-passwd" ,passwd)
                                     ("etc-shadow" ,shadow)
                                     ("etc-group" ,group)
                                     ,@(append-map service-inputs
                                                   %dmd-services))))))

;;; vm.scm ends here