summaryrefslogtreecommitdiff
path: root/guix/scripts/pull.scm
blob: b7e0a4a416a8863452dd53b72cb53e79e9c887fe (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
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
;;;
;;; 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 pull)
  #:use-module ((guix ui) #:hide (display-profile-content))
  #:use-module (guix colors)
  #:use-module (guix utils)
  #:use-module ((guix status) #:select (with-status-verbosity))
  #:use-module (guix scripts)
  #:use-module (guix store)
  #:use-module (guix config)
  #:use-module (guix packages)
  #:use-module (guix derivations)
  #:use-module (guix profiles)
  #:use-module (guix gexp)
  #:use-module (guix grafts)
  #:use-module (guix memoization)
  #:use-module (guix monads)
  #:use-module (guix channels)
  #:autoload   (guix inferior) (open-inferior
                                inferior-available-packages
                                close-inferior)
  #:use-module (guix scripts build)
  #:use-module (guix scripts describe)
  #:autoload   (guix build utils) (which)
  #:use-module ((guix build syscalls)
                #:select (with-file-lock/no-wait))
  #:use-module (guix git)
  #:use-module (git)
  #:use-module (gnu packages)
  #:use-module ((guix scripts package) #:select (build-and-use-profile
                                                 delete-matching-generations))
  #:use-module ((gnu packages base) #:select (canonical-package))
  #:use-module (gnu packages guile)
  #:use-module ((gnu packages bootstrap)
                #:select (%bootstrap-guile))
  #:use-module ((gnu packages certs) #:select (le-certs))
  #:use-module (srfi srfi-1)
  #: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 (ice-9 match)
  #:use-module (ice-9 vlist)
  #:use-module (ice-9 format)
  #:re-export (display-profile-content
               channel-commit-hyperlink)
  #:export (channel-list
            with-git-error-handling
            guix-pull))

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

(define %default-options
  ;; Alist of default option values.
  `((system . ,(%current-system))
    (substitutes? . #t)
    (offload? . #t)
    (print-build-trace? . #t)
    (print-extended-build-trace? . #t)
    (multiplexed-build-output? . #t)
    (graft? . #t)
    (debug . 0)
    (verbosity . 1)))

(define (show-help)
  (display (G_ "Usage: guix pull [OPTION]...
Download and deploy the latest version of Guix.\n"))
  (display (G_ "
  -C, --channels=FILE    deploy the channels defined in FILE"))
  (display (G_ "
      --url=URL          download from the Git repository at URL"))
  (display (G_ "
      --commit=COMMIT    download the specified COMMIT"))
  (display (G_ "
      --branch=BRANCH    download the tip of the specified BRANCH"))
  (display (G_ "
  -N, --news             display news compared to the previous generation"))
  (display (G_ "
  -l, --list-generations[=PATTERN]
                         list generations matching PATTERN"))
  (display (G_ "
      --roll-back        roll back to the previous generation"))
  (display (G_ "
  -d, --delete-generations[=PATTERN]
                         delete generations matching PATTERN"))
  (display (G_ "
  -S, --switch-generation=PATTERN
                         switch to a generation matching PATTERN"))
  (display (G_ "
  -p, --profile=PROFILE  use PROFILE instead of ~/.config/guix/current"))
  (display (G_ "
  -v, --verbosity=LEVEL  use the given verbosity LEVEL"))
  (display (G_ "
  -s, --system=SYSTEM    attempt to build for SYSTEM--e.g., \"i686-linux\""))
  (display (G_ "
      --bootstrap        use the bootstrap Guile to build the new Guix"))
  (newline)
  (show-build-options-help)
  (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 '(#\C "channels") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'channel-file arg result)))
         (option '(#\l "list-generations") #f #t
                 (lambda (opt name arg result)
                   (cons `(query list-generations ,arg)
                         result)))
         (option '("roll-back") #f #f
                 (lambda (opt name arg result)
                   (cons '(generation roll-back)
                         result)))
         (option '(#\S "switch-generation") #t #f
                 (lambda (opt name arg result)
                   (cons `(generation switch ,arg)
                         result)))
         (option '(#\d "delete-generations") #f #t
                 (lambda (opt name arg result)
                   (cons `(generation delete ,arg)
                         result)))
         (option '(#\N "news") #f #f
                 (lambda (opt name arg result)
                   (cons '(query display-news) result)))
         (option '("url") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'repository-url arg
                               (alist-delete 'repository-url result))))
         (option '("commit") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'ref `(commit . ,arg) result)))
         (option '("branch") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'ref `(branch . ,arg) result)))
         (option '(#\p "profile") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'profile (canonicalize-profile arg)
                               result)))
         (option '(#\s "system") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'system arg
                               (alist-delete 'system result eq?))))
         (option '(#\n "dry-run") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'dry-run? #t (alist-cons 'graft? #f 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 '("bootstrap") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'bootstrap? #t result)))

         (option '(#\h "help") #f #f
                 (lambda args
                   (show-help)
                   (exit 0)))
         (option '(#\V "version") #f #f
                 (lambda args
                   (show-version-and-exit "guix pull")))

         %standard-build-options))

(define* (display-profile-news profile #:key concise?
                               current-is-newer?)
  "Display what's up in PROFILE--new packages, and all that.  If
CURRENT-IS-NEWER? is true, assume that the current process represents the
newest generation of PROFILE.  Return true when there's more info to display."
  (match (memv (generation-number profile)
               (reverse (profile-generations profile)))
    ((current previous _ ...)
     (let ((these (fold-available-packages
                   (lambda* (name version result
                                  #:key supported? deprecated?
                                  #:allow-other-keys)
                     (if (and supported? (not deprecated?))
                         (alist-cons name version result)
                         result))
                   '()))
           (those (profile-package-alist
                   (generation-file-name profile
                                         (if current-is-newer?
                                             previous
                                             current)))))
       (let ((old (if current-is-newer? those these))
             (new (if current-is-newer? these those)))
         (display-new/upgraded-packages old new
                                        #:concise? concise?
                                        #:heading
                                        (G_ "New in this revision:\n")))))
    (_ #f)))

(define (display-channel channel)
  "Display information about CHANNEL."
  (format (current-error-port)
          ;; TRANSLATORS: This describes a "channel"; the first placeholder is
          ;; the channel name (e.g., "guix") and the second placeholder is its
          ;; URL.
          (G_ "    ~a at ~a~%")
          (channel-name channel)
          (channel-url channel)))

(define (channel=? channel1 channel2)
  "Return true if CHANNEL1 and CHANNEL2 are the same for all practical
purposes."
  ;; Assume that the URL matters less than the name.
  (eq? (channel-name channel1) (channel-name channel2)))

(define (display-news-entry-title entry language port)
  "Display the title of ENTRY, a news entry, to PORT."
  (define title
    (channel-news-entry-title entry))

  (let ((title (or (assoc-ref title language)
                   (assoc-ref title (%default-message-language))
                   "")))
    (format port "  ~a~%"
            (highlight
             (string-trim-right
              (catch 'parser-error
                (lambda ()
                  (texi->plain-text title))

                ;; When Texinfo markup is invalid, display it as-is.
                (const title)))))))

(define (display-news-entry entry channel language port)
  "Display ENTRY, a <channel-news-entry> from CHANNEL, in LANGUAGE, a language
code, to PORT."
  (define body
    (channel-news-entry-body entry))

  (define commit
    (channel-news-entry-commit entry))

  (display-news-entry-title entry language port)
  (format port (dim (G_ "    commit ~a~%"))
          (if (supports-hyperlinks?)
              (channel-commit-hyperlink channel commit)
              commit))
  (newline port)
  (let ((body (or (assoc-ref body language)
                  (assoc-ref body (%default-message-language))
                  "")))
    (format port "~a~%"
            (indented-string
             (parameterize ((%text-width (- (%text-width) 4)))
               (string-trim-right
                (catch 'parser-error
                  (lambda ()
                    (texi->plain-text body))
                  (lambda _
                    ;; When Texinfo markup is invalid, display it as-is.
                    (fill-paragraph body (%text-width))))))
             4))))

(define* (display-channel-specific-news new old
                                        #:key (port (current-output-port))
                                        concise?)
  "Display channel news applicable the commits between OLD and NEW, where OLD
and NEW are <channel> records with a proper 'commit' field.  When CONCISE? is
true, display nothing but the news titles.  Return true if there are more news
to display."
  (let ((channel new)
        (old     (channel-commit old))
        (new     (channel-commit new)))
    (when (and old new)
      (let ((language (current-message-language)))
        (match (channel-news-for-commit channel new old)
          (()                                     ;no news is good news
           #f)
          ((entries ...)
           (newline port)
           (format port (G_ "News for channel '~a'~%")
                   (channel-name channel))
           (for-each (if concise?
                         (cut display-news-entry-title <> language port)
                         (cut display-news-entry <> channel language port))
                     entries)
           (newline port)
           #t))))))

(define* (display-channel-news profile
                               #:optional
                               (previous
                                (and=> (relative-generation profile -1)
                                       (cut generation-file-name profile <>))))
  "Display news about the channels of PROFILE compared to PREVIOUS."
  (when previous
    (let ((old-channels (profile-channels previous))
          (new-channels (profile-channels profile)))
      (and (pair? old-channels) (pair? new-channels)
           (begin
             (match (lset-difference channel=? new-channels old-channels)
               (()
                #t)
               (new
                (let ((count (length new)))
                  (format (current-error-port)
                          (N_ "  ~a new channel:~%"
                              "  ~a new channels:~%" count)
                          count)
                  (for-each display-channel new))))
             (match (lset-difference channel=? old-channels new-channels)
               (()
                #t)
               (removed
                (let ((count (length removed)))
                  (format (current-error-port)
                          (N_ "  ~a channel removed:~%"
                              "  ~a channels removed:~%" count)
                          count)
                  (for-each display-channel removed))))

             ;; Display channel-specific news for those channels that were
             ;; here before and are still around afterwards.
             (for-each (match-lambda
                         ((new old)
                          (display-channel-specific-news new old)))
                       (filter-map (lambda (new)
                                     (define old
                                       (find (cut channel=? new <>)
                                             old-channels))

                                     (and old (list new old)))
                                   new-channels)))))))

(define* (display-channel-news-headlines profile)
  "Display the titles of news about the channels of PROFILE compared to its
previous generation.  Return true if there are news to display."
  (define previous
    (and=> (relative-generation profile -1)
           (cut generation-file-name profile <>)))

  (when previous
    (let ((old-channels (profile-channels previous))
          (new-channels (profile-channels profile)))
      ;; Find the channels present in both PROFILE and PREVIOUS, and print
      ;; their news.
      (and (pair? old-channels) (pair? new-channels)
           (let ((channels (filter-map (lambda (new)
                                         (define old
                                           (find (cut channel=? new <>)
                                                 old-channels))

                                         (and old (list new old)))
                                       new-channels)))
             (define more?
               (map (match-lambda
                      ((new old)
                       (display-channel-specific-news new old
                                                      #:concise? #t)))
                    channels))

             (any ->bool more?))))))

(define (display-news profile)
  ;; Display profile news, with the understanding that this process represents
  ;; the newest generation.
  (display-profile-news profile
                        #:current-is-newer? #t)

  (display-channel-news profile))

(define* (build-and-install instances profile)
  "Build the tool from SOURCE, and install it in PROFILE.  When DRY-RUN? is
true, display what would be built without actually building it."
  (define update-profile
    (store-lift build-and-use-profile))

  (define guix-command
    ;; The 'guix' command before we've built the new profile.
    (which "guix"))

  (mlet %store-monad ((manifest (channel-instances->manifest instances)))
    (mbegin %store-monad
      (update-profile profile manifest
                      #:hooks %channel-profile-hooks)

      (return
       (let ((more? (list (display-profile-news profile #:concise? #t)
                          (display-channel-news-headlines profile))))
         (newline)
         (when (any ->bool more?)
           (display-hint
            (G_ "Run @command{guix pull --news} to read all the news.")))))
      (if guix-command
          (let ((new (map (cut string-append <> "/bin/guix")
                          (list (user-friendly-profile profile)
                                profile))))
            ;; Is the 'guix' command previously in $PATH the same as the new
            ;; one?  If the answer is "no", then suggest 'hash guix'.
            (unless (member guix-command new)
              (display-hint (format #f (G_ "After setting @code{PATH}, run
@command{hash guix} to make sure your shell refers to @file{~a}.")
                                    (first new))))
            (return #f))
          (return #f)))))

(define (honor-lets-encrypt-certificates! store)
  "Tell Guile-Git to use the Let's Encrypt certificates."
  (let* ((drv   (package-derivation store le-certs))
         (certs (string-append (derivation->output-path drv)
                               "/etc/ssl/certs")))
    (build-derivations store (list drv))
    (set-tls-certificate-locations! certs)))

(define (honor-x509-certificates store)
  "Use the right X.509 certificates for Git checkouts over HTTPS."
  (unless (honor-system-x509-certificates!)
    (honor-lets-encrypt-certificates! store)))

(define (report-git-error error)
  "Report the given Guile-Git error."
  ;; Prior to Guile-Git commit b6b2760c2fd6dfaa5c0fedb43eeaff06166b3134,
  ;; errors would be represented by integers.
  (match error
    ((? integer? error)                           ;old Guile-Git
     (leave (G_ "Git error ~a~%") error))
    ((? git-error? error)                         ;new Guile-Git
     (leave (G_ "Git error: ~a~%") (git-error-message error)))))

(define-syntax-rule (with-git-error-handling body ...)
  (catch 'git-error
    (lambda ()
      body ...)
    (lambda (key err)
      (report-git-error err))))


;;;
;;; Profile.
;;;

(define %current-profile
  ;; The "real" profile under /var/guix.
  (string-append %profile-directory "/current-guix"))

(define %user-profile-directory
  ;; The user-friendly name of %CURRENT-PROFILE.
  (string-append (config-directory #:ensure? #f) "/current"))

(define (migrate-generations profile directory)
  "Migrate the generations of PROFILE to DIRECTORY."
  (format (current-error-port)
          (G_ "Migrating profile generations to '~a'...~%")
          %profile-directory)
  (let ((current (generation-number profile)))
    (for-each (lambda (generation)
                (let ((source (generation-file-name profile generation))
                      (target (string-append directory "/current-guix-"
                                             (number->string generation)
                                             "-link")))
                  ;; Note: Don't use 'rename-file' as SOURCE and TARGET might
                  ;; live on different file systems.
                  (symlink (readlink source) target)
                  (delete-file source)))
              (profile-generations profile))
    (symlink (string-append "current-guix-"
                            (number->string current) "-link")
             (string-append directory "/current-guix"))))

(define (ensure-default-profile)
  (ensure-profile-directory)

  ;; In 0.15.0+ we'd create ~/.config/guix/current-[0-9]*-link symlinks.  Move
  ;; them to %PROFILE-DIRECTORY.
  ;;
  ;; XXX: Ubuntu's 'sudo' preserves $HOME by default, and thus the second
  ;; condition below is always false when one runs "sudo guix pull".  As a
  ;; workaround, skip this code when $SUDO_USER is set.  See
  ;; <https://bugs.gnu.org/36785>.
  (unless (or (getenv "SUDO_USER")
              (string=? %profile-directory
                        (dirname
                         (canonicalize-profile %user-profile-directory))))
    (migrate-generations %user-profile-directory %profile-directory))

  ;; Make sure ~/.config/guix/current points to /var/guix/profiles/….
  (let ((link %user-profile-directory))
    (unless (equal? (false-if-exception (readlink link))
                    %current-profile)
      (catch 'system-error
        (lambda ()
          (false-if-exception (delete-file link))
          (symlink %current-profile link))
        (lambda args
          (leave (G_ "while creating symlink '~a': ~a~%")
                 link (strerror (system-error-errno args))))))))


;;;
;;; Queries.
;;;

(define profile-package-alist
  (mlambda (profile)
    "Return a name/version alist representing the packages in PROFILE."
    (let* ((inferior (open-inferior profile))
           (packages (inferior-available-packages inferior)))
      (close-inferior inferior)
      packages)))

(define (new/upgraded-packages alist1 alist2)
  "Compare ALIST1 and ALIST2, both of which are lists of package name/version
pairs, and return two values: the list of packages new in ALIST2, and the list
of packages upgraded in ALIST2."
  (let* ((old      (fold (match-lambda*
                           (((name . version) table)
                            (match (vhash-assoc name table)
                              (#f
                               (vhash-cons name version table))
                              ((_ . previous-version)
                               (if (version>? version previous-version)
                                   (vhash-cons name version table)
                                   table)))))
                         vlist-null
                         alist1))
         (new      (remove (match-lambda
                             ((name . _)
                              (vhash-assoc name old)))
                           alist2))
         (upgraded (filter-map (match-lambda
                                 ((name . new-version)
                                  (match (vhash-assoc name old)
                                    (#f #f)
                                    ((_ . old-version)
                                     (and (version>? new-version old-version)
                                          (string-append name "@"
                                                         new-version))))))
                               alist2)))
    (values new upgraded)))

(define* (ellipsis #:optional (port (current-output-port)))
  "Return HORIZONTAL ELLIPSIS three dots if PORT's encoding cannot represent
it."
  (match (port-encoding port)
    ("UTF-8" "…")
    (_       "...")))

(define* (display-new/upgraded-packages alist1 alist2
                                        #:key (heading "") concise?)
  "Given the two package name/version alists ALIST1 and ALIST2, display the
list of new and upgraded packages going from ALIST1 to ALIST2.  When ALIST1
and ALIST2 differ, display HEADING upfront.  When CONCISE? is true, do not
display long package lists that would fill the user's screen.

Return true when there is more package info to display."
  (define (pretty str column)
    (indented-string (fill-paragraph str (- (%text-width) 4)
                                     column)
                     4 #:initial-indent? #f))

  (define concise/max-item-count
    ;; Maximum number of items to display when CONCISE? is true.
    12)

  (define list->enumeration
    (if concise?
        (lambda* (lst #:optional (max concise/max-item-count))
          (if (> (length lst) max)
              (string-append (string-join (take lst max) ", ")
                             ", " (ellipsis))
              (string-join lst ", ")))
        (cut string-join <> ", ")))

  (let-values (((new upgraded) (new/upgraded-packages alist1 alist2)))
    (define new-count (length new))
    (define upgraded-count (length upgraded))

    (unless (and (null? new) (null? upgraded))
      (display heading))

    (match new-count
      (0 #t)
      (count
       (format #t (N_ "  ~h new package: ~a~%"
                      "  ~h new packages: ~a~%" count)
               count
               (pretty (list->enumeration (sort (map first new) string<?))
                       30))))
    (match upgraded-count
      (0 #t)
      (count
       (format #t (N_ "  ~h package upgraded: ~a~%"
                      "  ~h packages upgraded: ~a~%" count)
               count
               (pretty (list->enumeration (sort upgraded string<?))
                       35))))

    (and concise?
         (or (> new-count concise/max-item-count)
             (> upgraded-count concise/max-item-count)))))

(define (display-profile-content-diff profile gen1 gen2)
  "Display the changes in PROFILE GEN2 compared to generation GEN1."
  (define (package-alist generation)
    (profile-package-alist (generation-file-name profile generation)))

  (display-profile-content profile gen2)
  (display-new/upgraded-packages (package-alist gen1)
                                 (package-alist gen2)))

(define (process-query opts profile)
  "Process any query on PROFILE specified by OPTS."
  (match (assoc-ref opts 'query)
    (('list-generations pattern)
     (define (list-generations profile numbers)
       (match numbers
         ((first rest ...)
          (display-profile-content profile first)
          (let loop ((numbers numbers))
            (match numbers
              ((first second rest ...)
               (display-profile-content-diff profile
                                             first second)
               (display-channel-news (generation-file-name profile second)
                                     (generation-file-name profile first))
               (loop (cons second rest)))
              ((_) #t)
              (()  #t))))))

     (leave-on-EPIPE
      (cond ((not (file-exists? profile))         ; XXX: race condition
             (raise (condition (&profile-not-found-error
                                (profile profile)))))
            ((not pattern)
             (list-generations profile (profile-generations profile)))
            ((matching-generations pattern profile)
             =>
             (match-lambda
               (()
                (exit 1))
               ((numbers ...)
                (list-generations profile numbers)))))))
    (('display-news)
     (display-news profile))))

(define (process-generation-change opts profile)
  "Process a request to change the current generation (roll-back, switch, delete)."
  (unless (assoc-ref opts 'dry-run?)
    (match (assoc-ref opts 'generation)
      (('roll-back)
       (with-store store
         (roll-back* store profile)))
      (('switch pattern)
       (let ((number (relative-generation-spec->number profile pattern)))
         (if number
             (switch-to-generation* profile number)
             (leave (G_ "cannot switch to generation '~a'~%") pattern))))
      (('delete pattern)
       (with-store store
         (delete-matching-generations store profile pattern))))))

(define (channel-list opts)
  "Return the list of channels to use.  If OPTS specify a channel file,
channels are read from there; otherwise, if ~/.config/guix/channels.scm
exists, read it; otherwise %DEFAULT-CHANNELS is used.  Apply channel
transformations specified in OPTS (resulting from '--url', '--commit', or
'--branch'), if any."
  (define file
    (assoc-ref opts 'channel-file))

  (define default-file
    (string-append (config-directory) "/channels.scm"))

  (define global-file
    (string-append %sysconfdir "/guix/channels.scm"))

  (define (load-channels file)
    (let ((result (load* file (make-user-module '((guix channels))))))
      (if (and (list? result) (every channel? result))
          result
          (leave (G_ "'~a' did not return a list of channels~%") file))))

  (define channels
    (cond (file
           (load-channels file))
          ((file-exists? default-file)
           (load-channels default-file))
          ((file-exists? global-file)
           (load-channels global-file))
          (else
           %default-channels)))

  (define (environment-variable)
    (match (getenv "GUIX_PULL_URL")
      (#f #f)
      (url
       (warning (G_ "The 'GUIX_PULL_URL' environment variable is deprecated.
Use '~/.config/guix/channels.scm' instead."))
       url)))

  (let ((ref (assoc-ref opts 'ref))
        (url (or (assoc-ref opts 'repository-url)
                 (environment-variable))))
    (if (or ref url)
        (match (find guix-channel? channels)
          ((? channel? guix)
           ;; Apply '--url', '--commit', and '--branch' to the 'guix' channel.
           (let ((url (or url (channel-url guix))))
             (cons (match ref
                     (('commit . commit)
                      (channel (inherit guix)
                               (url url) (commit commit) (branch #f)))
                     (('branch . branch)
                      (channel (inherit guix)
                               (url url) (commit #f) (branch branch)))
                     (#f
                      (channel (inherit guix) (url url))))
                   (remove guix-channel? channels))))
          (#f                           ;no 'guix' channel, failure will ensue
           channels))
        channels)))


(define (guix-pull . args)
  (with-error-handling
    (with-git-error-handling
     (let* ((opts         (parse-command-line args %options
                                              (list %default-options)))
            (substitutes? (assoc-ref opts 'substitutes?))
            (dry-run?     (assoc-ref opts 'dry-run?))
            (channels     (channel-list opts))
            (profile      (or (assoc-ref opts 'profile) %current-profile)))
       (cond ((assoc-ref opts 'query)
              (process-query opts profile))
             ((assoc-ref opts 'generation)
              (process-generation-change opts profile))
             (else
              (with-store store
                (with-status-verbosity (assoc-ref opts 'verbosity)
                  (parameterize ((%current-system (assoc-ref opts 'system))
                                 (%graft? (assoc-ref opts 'graft?)))
                    (with-build-handler (build-notifier #:use-substitutes?
                                                        substitutes?
                                                        #:dry-run? dry-run?)
                      (set-build-options-from-command-line store opts)
                      (ensure-default-profile)
                      (honor-x509-certificates store)

                      (let ((instances (latest-channel-instances store channels)))
                        (format (current-error-port)
                                (N_ "Building from this channel:~%"
                                    "Building from these channels:~%"
                                    (length instances)))
                        (for-each (lambda (instance)
                                    (let ((channel
                                           (channel-instance-channel instance)))
                                      (format (current-error-port)
                                              "  ~10a~a\t~a~%"
                                              (channel-name channel)
                                              (channel-url channel)
                                              (string-take
                                               (channel-instance-commit instance)
                                               7))))
                                  instances)
                        (parameterize ((%guile-for-build
                                        (package-derivation
                                         store
                                         (if (assoc-ref opts 'bootstrap?)
                                             %bootstrap-guile
                                             (canonical-package guile-2.2)))))
                          (with-profile-lock profile
                            (run-with-store store
                              (build-and-install instances profile)))))))))))))))

;;; pull.scm ends here