summaryrefslogtreecommitdiff
path: root/guix/scripts/build.scm
blob: 97e2f5a167a68e678b888354c8a2c1773ef45f33 (about) (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
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2021 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2020 Marius Bakke <mbakke@fastmail.com>
;;; Copyright © 2020 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 (guix scripts build)
  #:use-module (guix ui)
  #:use-module (guix scripts)
  #:autoload   (guix import json) (json->scheme-file)
  #:use-module (guix store)
  #:use-module (guix derivations)
  #:use-module (guix packages)
  #:use-module (guix memoization)
  #:use-module (guix grafts)

  #:use-module (guix utils)

  #:use-module (guix monads)
  #:use-module (guix gexp)
  #:use-module (guix profiles)
  #:use-module (guix diagnostics)
  #:autoload   (guix http-client) (http-fetch http-get-error?)
  #:use-module (ice-9 format)
  #:use-module (ice-9 match)
  #:use-module (ice-9 vlist)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-9)
  #:use-module (srfi srfi-11)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:use-module (srfi srfi-37)
  #:use-module (gnu packages)
  #:use-module ((guix status) #:select (with-status-verbosity))
  #:use-module ((guix progress) #:select (current-terminal-columns))
  #:use-module ((guix build syscalls) #:select (terminal-columns))
  #:use-module (guix transformations)
  #:export (log-url

            %standard-build-options
            set-build-options-from-command-line
            set-build-options-from-command-line*
            show-build-options-help

            guix-build
            register-root
            register-root*))

(define %default-log-urls
  ;; Default base URLs for build logs.
  '("http://ci.guix.gnu.org/log"))

;; XXX: The following procedure cannot be in (guix store) because of the
;; dependency on (guix derivations).
(define* (log-url store file #:key (base-urls %default-log-urls))
  "Return a URL under one of the BASE-URLS where a build log for FILE can be
found.  Return #f if no build log was found."
  (define (valid-url? url)
    ;; Probe URL and return #t if it is accessible.
    (catch #t
      (lambda ()
        (guard (c ((http-get-error? c) #f))
          (close-port (http-fetch url #:buffered? #f))
          #t))
      (match-lambda*
        (('getaddrinfo-error . _)
         #f)
        (('tls-certificate-error args ...)
         (report-error (G_ "cannot access build log at '~a':~%") url)
         (print-exception (current-error-port) #f
                          'tls-certificate-error args)
         (exit 1))
        ((key . args)
         (apply throw key args)))))

  (define (find-url file)
    (let ((base (basename file)))
      (any (lambda (base-url)
             (let ((url (string-append base-url "/" base)))
               (and (valid-url? url) url)))
           base-urls)))

  (cond ((derivation-path? file)
         (catch 'system-error
           (lambda ()
             ;; Usually we'll have more luck with the output file name since
             ;; the deriver that was used by the server could be different, so
             ;; try one of the output file names.
             (let ((drv (read-derivation-from-file file)))
               (or (find-url (derivation->output-path drv))
                   (find-url file))))
           (lambda args
             ;; As a last resort, try the .drv.
             (if (= ENOENT (system-error-errno args))
                 (find-url file)
                 (apply throw args)))))
        (else
         (find-url file))))

(define (register-root store paths root)
  "Register ROOT as an indirect GC root for all of PATHS."
  (let* ((root (if (string-prefix? "/" root)
                   root
                   (string-append (canonicalize-path (dirname root))
                                  "/" (basename root)))))
    (catch 'system-error
      (lambda ()
        (match paths
          ((path)
           (symlink path root)
           (add-indirect-root store root))
          ((paths ...)
           (fold (lambda (path count)
                   (let ((root (string-append root
                                              "-"
                                              (number->string count))))
                     (symlink path root)
                     (add-indirect-root store root))
                   (+ 1 count))
                 0
                 paths))))
      (lambda args
        (leave (G_ "failed to create GC root `~a': ~a~%")
               root (strerror (system-error-errno args)))))))

(define register-root*
  (store-lift register-root))


;;;
;;; Standard command-line build options.
;;;

(define (show-build-options-help)
  "Display on the current output port help about the standard command-line
options handled by 'set-build-options-from-command-line', and listed in
'%standard-build-options'."
  (display (G_ "
  -L, --load-path=DIR    prepend DIR to the package module search path"))
  (display (G_ "
  -K, --keep-failed      keep build tree of failed builds"))
  (display (G_ "
  -k, --keep-going       keep going when some of the derivations fail"))
  (display (G_ "
  -n, --dry-run          do not build the derivations"))
  (display (G_ "
      --fallback         fall back to building when the substituter fails"))
  (display (G_ "
      --no-substitutes   build instead of resorting to pre-built substitutes"))
  (display (G_ "
      --substitute-urls=URLS
                         fetch substitute from URLS if they are authorized"))
  (display (G_ "
      --no-grafts        do not graft packages"))
  (display (G_ "
      --no-offload       do not attempt to offload builds"))
  (display (G_ "
      --max-silent-time=SECONDS
                         mark the build as failed after SECONDS of silence"))
  (display (G_ "
      --timeout=SECONDS  mark the build as failed after SECONDS of activity"))
  (display (G_ "
      --rounds=N         build N times in a row to detect non-determinism"))
  (display (G_ "
  -c, --cores=N          allow the use of up to N CPU cores for the build"))
  (display (G_ "
  -M, --max-jobs=N       allow at most N build jobs"))
  (display (G_ "
      --debug=LEVEL      produce debugging output at LEVEL")))

(define (set-build-options-from-command-line store opts)
  "Given OPTS, an alist as returned by 'args-fold' given
'%standard-build-options', set the corresponding build options on STORE."

  ;; '--keep-failed' has no effect when talking to a remote daemon.  Catch the
  ;; case where GUIX_DAEMON_SOCKET=guix://….
  (when (and (assoc-ref opts 'keep-failed?)
             (let* ((socket (store-connection-socket store))
                    (peer   (catch 'system-error
                              (lambda ()
                                (and (file-port? socket)
                                     (getpeername socket)))
                              (const #f))))
               (and peer (not (= AF_UNIX (sockaddr:fam peer))))))
    (warning (G_ "'--keep-failed' ignored since you are \
talking to a remote daemon\n")))

  (set-build-options store
                     #:keep-failed? (assoc-ref opts 'keep-failed?)
                     #:keep-going? (assoc-ref opts 'keep-going?)
                     #:rounds (assoc-ref opts 'rounds)
                     #:build-cores (assoc-ref opts 'cores)
                     #:max-build-jobs (assoc-ref opts 'max-jobs)
                     #:fallback? (assoc-ref opts 'fallback?)
                     #:use-substitutes? (assoc-ref opts 'substitutes?)
                     #:substitute-urls (assoc-ref opts 'substitute-urls)
                     #:offload? (and (assoc-ref opts 'offload?)
                                     (not (assoc-ref opts 'keep-failed?)))
                     #:max-silent-time (assoc-ref opts 'max-silent-time)
                     #:timeout (assoc-ref opts 'timeout)
                     #:print-build-trace (assoc-ref opts 'print-build-trace?)
                     #:print-extended-build-trace?
                     (assoc-ref opts 'print-extended-build-trace?)
                     #:multiplexed-build-output?
                     (assoc-ref opts 'multiplexed-build-output?)
                     #:verbosity (assoc-ref opts 'debug)))

(define set-build-options-from-command-line*
  (store-lift set-build-options-from-command-line))

(define %standard-build-options
  ;; List of standard command-line options for tools that build something.
  (list (option '(#\L "load-path") #t #f
                (lambda (opt name arg result . rest)
                  ;; XXX: Imperatively modify the search paths.
                  (%package-module-path (cons arg (%package-module-path)))
                  (%patch-path (cons arg (%patch-path)))
                  (set! %load-path (cons arg %load-path))
                  (set! %load-compiled-path (cons arg %load-compiled-path))

                  (apply values (cons result rest))))
        (option '(#\K "keep-failed") #f #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'keep-failed? #t result)
                         rest)))
        (option '(#\k "keep-going") #f #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'keep-going? #t result)
                         rest)))
        (option '("rounds") #t #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'rounds (string->number* arg)
                                     result)
                         rest)))
        (option '("fallback") #f #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'fallback? #t
                                     (alist-delete 'fallback? result))
                         rest)))
        (option '("no-substitutes") #f #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'substitutes? #f
                                     (alist-delete 'substitutes? result))
                         rest)))
        (option '("substitute-urls") #t #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'substitute-urls
                                     (string-tokenize arg)
                                     (alist-delete 'substitute-urls result))
                         rest)))
        (option '("no-grafts") #f #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'graft? #f
                                     (alist-delete 'graft? result eq?))
                         rest)))
        (option '("no-offload" "no-build-hook") #f #f
                (lambda (opt name arg result . rest)
                  (when (string=? name "no-build-hook")
                    (warning (G_ "'--no-build-hook' is deprecated; \
use '--no-offload' instead~%")))

                  (apply values
                         (alist-cons 'offload? #f
                                     (alist-delete 'offload? result))
                         rest)))
        (option '("max-silent-time") #t #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'max-silent-time (string->number* arg)
                                     result)
                         rest)))
        (option '("timeout") #t #f
                (lambda (opt name arg result . rest)
                  (apply values
                         (alist-cons 'timeout (string->number* arg) result)
                         rest)))
        (option '("debug") #t #f
                (lambda (opt name arg result . rest)
                  (let ((level (string->number* arg)))
                    (apply values
                           (alist-cons 'debug level
                                       (alist-delete 'debug result))
                           rest))))
        (option '(#\c "cores") #t #f
                (lambda (opt name arg result . rest)
                  (let ((c (false-if-exception (string->number arg))))
                    (if c
                        (apply values (alist-cons 'cores c result) rest)
                        (leave (G_ "not a number: '~a' option argument: ~a~%")
                               name arg)))))
        (option '(#\M "max-jobs") #t #f
                (lambda (opt name arg result . rest)
                  (let ((c (false-if-exception (string->number arg))))
                    (if c
                        (apply values (alist-cons 'max-jobs c result) rest)
                        (leave (G_ "not a number: '~a' option argument: ~a~%")
                               name arg)))))))


;;;
;;; Command-line options.
;;;

(define %default-options
  ;; Alist of default option values.
  `((build-mode . ,(build-mode normal))
    (graft? . #t)
    (substitutes? . #t)
    (offload? . #t)
    (print-build-trace? . #t)
    (print-extended-build-trace? . #t)
    (multiplexed-build-output? . #t)
    (verbosity . 3)
    (debug . 0)))

(define (show-help)
  (display (G_ "Usage: guix build [OPTION]... PACKAGE-OR-DERIVATION...
Build the given PACKAGE-OR-DERIVATION and return their output paths.\n"))
  (display (G_ "
  -e, --expression=EXPR  build the package or derivation EXPR evaluates to"))
  (display (G_ "
  -f, --file=FILE        build the package or derivation that the code within
                         FILE evaluates to"))
  (display (G_ "
  -m, --manifest=FILE    build the packages that the manifest given in FILE
                         evaluates to"))
  (display (G_ "
  -S, --source           build the packages' source derivations"))
  (display (G_ "
      --sources[=TYPE]   build source derivations; TYPE may optionally be one
                         of \"package\", \"all\" (default), or \"transitive\""))
  (display (G_ "
  -s, --system=SYSTEM    attempt to build for SYSTEM--e.g., \"i686-linux\""))
  (display (G_ "
      --target=TRIPLET   cross-build for TRIPLET--e.g., \"armel-linux-gnu\""))
  (display (G_ "
  -d, --derivations      return the derivation paths of the given packages"))
  (display (G_ "
      --check            rebuild items to check for non-determinism issues"))
  (display (G_ "
      --repair           repair the specified items"))
  (display (G_ "
  -r, --root=FILE        make FILE a symlink to the result, and register it
                         as a garbage collector root"))
  (display (G_ "
  -v, --verbosity=LEVEL  use the given verbosity LEVEL"))
  (display (G_ "
  -q, --quiet            do not show the build log"))
  (display (G_ "
      --log-file         return the log file names for the given derivations"))
  (newline)
  (show-build-options-help)
  (newline)
  (show-transformation-options-help)
  (newline)
  (display (G_ "
  -h, --help             display this help and exit"))
  (display (G_ "
  -V, --version          display version information and exit"))
  (newline)
  (show-bug-report-information))

(define %options
  ;; Specifications of the command-line options.
  (cons* (option '(#\h "help") #f #f
                 (lambda args
                   (show-help)
                   (exit 0)))
         (option '(#\V "version") #f #f
                 (lambda args
                   (show-version-and-exit "guix build")))
         (option '(#\S "source") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'source #t result)))
         (option '("sources") #f #t
                 (lambda (opt name arg result)
                   (match arg
                     ("package"
                      (alist-cons 'source #t result))
                     ((or "all" #f)
                      (alist-cons 'source package-direct-sources result))
                     ("transitive"
                      (alist-cons 'source package-transitive-sources result))
                     (else
                      (leave (G_ "invalid argument: '~a' option argument: ~a, ~
must be one of 'package', 'all', or 'transitive'~%")
                             name arg)))))
         (option '("check") #f #f
                 (lambda (opt name arg result . rest)
                   (apply values
                          (alist-cons 'build-mode (build-mode check)
                                      result)
                          rest)))
         (option '("repair") #f #f
                 (lambda (opt name arg result . rest)
                   (apply values
                          (alist-cons 'build-mode (build-mode repair)
                                      result)
                          rest)))
         (option '(#\s "system") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'system arg result)))
         (option '("target") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'target arg
                               (alist-delete 'target result eq?))))
         (option '(#\d "derivations") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'derivations-only? #t result)))
         (option '(#\e "expression") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'expression arg result)))
         (option '(#\f "file") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'file arg result)))
         (option '(#\m "manifest") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'manifest arg result)))
         (option '(#\n "dry-run") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'dry-run? #t result)))
         (option '(#\r "root") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'gc-root arg result)))
         (option '(#\v "verbosity") #t #f
                 (lambda (opt name arg result)
                   (let ((level (string->number* arg)))
                     (alist-cons 'verbosity level
                                 (alist-delete 'verbosity result)))))
         (option '(#\q "quiet") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'verbosity 0
                               (alist-delete 'verbosity result))))
         (option '("log-file") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'log-file? #t result)))

         (append %transformation-options
                 %standard-build-options)))

(define (options->things-to-build opts)
  "Read the arguments from OPTS and return a list of high-level objects to
build---packages, gexps, derivations, and so on."
  (define (validate-type x)
    (unless (or (derivation? x) (file-like? x) (gexp? x) (procedure? x))
      (raise (make-compound-condition
               (formatted-message (G_ "~s: not something we can build~%") x)
               (condition
                (&fix-hint
                 (hint
                   (if (unspecified? x)
                       (G_ "If you build from a file, make sure the last Scheme
expression returns a package value.  @code{define-public} defines a variable,
but returns @code{#<unspecified>}.  To fix this, add a Scheme expression at
the end of the file that consists only of the package's variable name you
defined, as in this example:

@example
(define-public my-package
  (package
    ...))

my-package
@end example")
                       (G_ "If you build from a file, make sure the last
Scheme expression returns a package, gexp, derivation or a list of such
values.")))))))))

  (define (ensure-list x)
    (let ((lst (match x
                 ((x ...) x)
                 (x       (list x)))))
      (for-each validate-type lst)
      lst))

  (append-map (match-lambda
                (('argument . (? string? spec))
                 (cond ((derivation-path? spec)
                        (catch 'system-error
                          (lambda ()
                            ;; Ask for absolute file names so that .drv file
                            ;; names passed from the user to 'read-derivation'
                            ;; are absolute when it returns.
                            (let ((spec (canonicalize-path spec)))
                              (list (read-derivation-from-file spec))))
                          (lambda args
                            ;; Non-existent .drv files can be substituted down
                            ;; the road, so don't error out.
                            (if (= ENOENT (system-error-errno args))
                                '()
                                (apply throw args)))))
                       ((store-path? spec)
                        ;; Nothing to do; maybe for --log-file.
                        '())
                       (else
                        (list (specification->package spec)))))
                (('file . file)
                 (let ((file (or (and (string-suffix? ".json" file)
                                      (json->scheme-file file))
                                 file)))
                   (ensure-list (load* file (make-user-module '())))))
                (('manifest . manifest)
                 (map manifest-entry-item
                      (manifest-entries
                       (load* manifest
                              (make-user-module '((guix profiles) (gnu)))))))
                (('expression . str)
                 (ensure-list (read/eval str)))
                (('argument . (? derivation? drv))
                 drv)
                (_ '()))
              opts))

(define (options->derivations store opts)
  "Given OPTS, the result of 'args-fold', return a list of derivations to
build."
  (define transform
    (options->transformation opts))

  (define package->derivation
    (match (assoc-ref opts 'target)
      (#f package-derivation)
      (triplet
       (cut package-cross-derivation <> <> triplet <>))))

  (define src    (assoc-ref opts 'source))
  (define graft? (assoc-ref opts 'graft?))
  (define systems
    (match (filter-map (match-lambda
                         (('system . system) system)
                         (_ #f))
                       opts)
      (()      (list (%current-system)))
      (systems systems)))

  (define things-to-build
    (map transform (options->things-to-build opts)))

  (define (compute-derivation obj system)
    ;; Compute the derivation of OBJ for SYSTEM.
    (match obj
      ((? package? p)
       (let ((p (or (and graft? (package-replacement p)) p)))
         (match src
           (#f
            (list (package->derivation store p system)))
           (#t
            (match (package-source p)
              (#f
               (warning (package-location p)
                        (G_ "package '~a' has no source~%")
                        (package-name p))
               '())
              (s
               (list (package-source-derivation store s)))))
           (proc
            (map (cut package-source-derivation store <>)
                 (proc p))))))
      ((? derivation? drv)
       (list drv))
      ((? procedure? proc)
       (list (run-with-store store
               (mbegin %store-monad
                 (set-guile-for-build (default-guile))
                 (proc))
               #:system system)))
      ((? file-like? obj)
       (list (run-with-store store
               (lower-object obj system
                             #:target (assoc-ref opts 'target))
               #:system system)))
      ((? gexp? gexp)
       (list (run-with-store store
               (mbegin %store-monad
                 (set-guile-for-build (default-guile))
                 (gexp->derivation "gexp" gexp
                                   #:system system))
               #:system system)))))

  ;; We may get 'unbound-variable' errors while evaluating the 'inputs' fields
  ;; of user packages.  Since 'guix build' is the primary tool for people
  ;; testing new packages, report such errors gracefully.
  (with-unbound-variable-handling
   (parameterize ((%graft? graft?))
     (append-map (lambda (system)
                   (concatenate
                    (map/accumulate-builds store
                                           (cut compute-derivation <> system)
                                           things-to-build)))
                 systems))))

(define (show-build-log store file urls)
  "Show the build log for FILE, falling back to remote logs from URLS if
needed."
  (let ((log (or (log-file store file)
                 (log-url store file #:base-urls urls))))
    (if log
        (format #t "~a~%" log)
        (leave (G_ "no build log for '~a'~%") file))))


;;;
;;; Entry point.
;;;

(define-command (guix-build . args)
  (category packaging)
  (synopsis "build packages or derivations without installing them")

  (define opts
    (parse-command-line args %options
                        (list %default-options)))

  (define graft?
    (assoc-ref opts 'graft?))

  (with-error-handling
    (with-status-verbosity (assoc-ref opts 'verbosity)
      (with-store store
        ;; Set the build options before we do anything else.
        (set-build-options-from-command-line store opts)

        (with-build-handler (build-notifier #:use-substitutes?
                                            (assoc-ref opts 'substitutes?)
                                            #:verbosity
                                            (assoc-ref opts 'verbosity)
                                            #:dry-run?
                                            (assoc-ref opts 'dry-run?))
          (parameterize ((current-terminal-columns (terminal-columns))

                         ;; Set grafting upfront in case the user's input
                         ;; depends on it (e.g., a manifest or code snippet that
                         ;; calls 'gexp->derivation').
                         (%graft?                  graft?))
            (let* ((mode  (assoc-ref opts 'build-mode))
                   (drv   (options->derivations store opts))
                   (urls  (map (cut string-append <> "/log")
                               (if (assoc-ref opts 'substitutes?)
                                   (or (assoc-ref opts 'substitute-urls)
                                       ;; XXX: This does not necessarily match the
                                       ;; daemon's substitute URLs.
                                       %default-substitute-urls)
                                   '())))
                   (items (filter-map (match-lambda
                                        (('argument . (? store-path? file))
                                         ;; If FILE is a .drv that's not in
                                         ;; store, keep it so that it can be
                                         ;; substituted.
                                         (and (or (not (derivation-path? file))
                                                  (not (file-exists? file)))
                                              file))
                                        (_ #f))
                                      opts))
                   (roots (filter-map (match-lambda
                                        (('gc-root . root) root)
                                        (_ #f))
                                      opts)))

              (when (and (null? drv) (null? items))
                (warning (G_ "no arguments specified, nothing to do~%")))

              (cond ((assoc-ref opts 'log-file?)
                     ;; Pass 'show-build-log' the output file names, not the
                     ;; derivation file names, because there can be several
                     ;; derivations leading to the same output.
                     (for-each (cut show-build-log store <> urls)
                               (delete-duplicates
                                (append (map derivation->output-path drv)
                                        items))))
                    ((assoc-ref opts 'derivations-only?)
                     (format #t "~{~a~%~}" (map derivation-file-name drv))
                     (for-each (cut register-root store <> <>)
                               (map (compose list derivation-file-name) drv)
                               roots))
                    (else
                     (and (build-derivations store (append drv items)
                                             mode)
                          (for-each show-derivation-outputs drv)
                          (for-each (cut register-root store <> <>)
                                    (map (lambda (drv)
                                           (map cdr
                                                (derivation->output-paths drv)))
                                         drv)
                                    roots)))))))))))