aboutsummaryrefslogtreecommitdiff
path: root/guix/scripts/package.scm
blob: 6069b203de4871f315138fc5f9485cab26ad17ce (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
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2013 Mark H Weaver <mhw@netris.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 (guix scripts package)
  #:use-module (guix ui)
  #:use-module (guix store)
  #:use-module (guix derivations)
  #:use-module (guix packages)
  #:use-module (guix profiles)
  #:use-module (guix utils)
  #:use-module (guix config)
  #:use-module (guix scripts build)
  #:use-module ((guix build utils) #:select (directory-exists? mkdir-p))
  #:use-module ((guix ftp-client) #:select (ftp-open))
  #:use-module (ice-9 format)
  #:use-module (ice-9 match)
  #:use-module (ice-9 regex)
  #:use-module (ice-9 vlist)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (srfi srfi-19)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-37)
  #:use-module (gnu packages)
  #:use-module ((gnu packages base) #:select (guile-final))
  #:use-module ((gnu packages bootstrap) #:select (%bootstrap-guile))
  #:use-module (guix gnu-maintenance)
  #:export (specification->package+output
            guix-package))

(define %store
  (make-parameter #f))


;;;
;;; Profiles.
;;;

(define %user-profile-directory
  (and=> (getenv "HOME")
         (cut string-append <> "/.guix-profile")))

(define %profile-directory
  (string-append %state-directory "/profiles/"
                 (or (and=> (getenv "USER")
                            (cut string-append "per-user/" <>))
                     "default")))

(define %current-profile
  ;; Call it `guix-profile', not `profile', to allow Guix profiles to
  ;; coexist with Nix profiles.
  (string-append %profile-directory "/guix-profile"))

(define (link-to-empty-profile generation)
  "Link GENERATION, a string, to the empty profile."
  (let* ((drv  (profile-derivation (%store) (manifest '())))
         (prof (derivation->output-path drv "out")))
    (when (not (build-derivations (%store) (list drv)))
          (leave (_ "failed to build the empty profile~%")))

    (switch-symlinks generation prof)))

(define (switch-to-previous-generation profile)
  "Atomically switch PROFILE to the previous generation."
  (let* ((number              (generation-number profile))
         (previous-number     (previous-generation-number profile number))
         (previous-generation (generation-file-name profile previous-number)))
    (format #t (_ "switching from generation ~a to ~a~%")
            number previous-number)
    (switch-symlinks profile previous-generation)))

(define (roll-back profile)
  "Roll back to the previous generation of PROFILE."
  (let* ((number              (generation-number profile))
         (previous-number     (previous-generation-number profile number))
         (previous-generation (generation-file-name profile previous-number))
         (manifest            (string-append previous-generation "/manifest")))
    (cond ((not (file-exists? profile))                 ; invalid profile
           (leave (_ "profile '~a' does not exist~%")
                  profile))
          ((zero? number)                               ; empty profile
           (format (current-error-port)
                   (_ "nothing to do: already at the empty profile~%")))
          ((or (zero? previous-number)                  ; going to emptiness
               (not (file-exists? previous-generation)))
           (link-to-empty-profile previous-generation)
           (switch-to-previous-generation profile))
          (else
           (switch-to-previous-generation profile)))))  ; anything else

(define* (matching-generations str #:optional (profile %current-profile)
                               #:key (duration-relation <=))
  "Return the list of available generations matching a pattern in STR.  See
'string->generations' and 'string->duration' for the list of valid patterns.
When STR is a duration pattern, return all the generations whose ctime has
DURATION-RELATION with the current time."
  (define (valid-generations lst)
    (define (valid-generation? n)
      (any (cut = n <>) (generation-numbers profile)))

    (fold-right (lambda (x acc)
                  (if (valid-generation? x)
                      (cons x acc)
                      acc))
                '()
                lst))

  (define (filter-generations generations)
    (match generations
      (() '())
      (('>= n)
       (drop-while (cut > n <>)
                   (generation-numbers profile)))
      (('<= n)
       (valid-generations (iota n 1)))
      ((lst ..1)
       (valid-generations lst))
      (_ #f)))

  (define (filter-by-duration duration)
    (define (time-at-midnight time)
      ;; Return TIME at midnight by setting nanoseconds, seconds, minutes, and
      ;; hours to zeros.
      (let ((d (time-utc->date time)))
         (date->time-utc
          (make-date 0 0 0 0
                     (date-day d) (date-month d)
                     (date-year d) (date-zone-offset d)))))

    (define generation-ctime-alist
      (map (lambda (number)
             (cons number
                   (time-second
                    (time-at-midnight
                     (generation-time profile number)))))
           (generation-numbers profile)))

    (match duration
      (#f #f)
      (res
       (let ((s (time-second
                 (subtract-duration (time-at-midnight (current-time))
                                    duration))))
         (delete #f (map (lambda (x)
                           (and (duration-relation s (cdr x))
                                (first x)))
                         generation-ctime-alist))))))

  (cond ((string->generations str)
         =>
         filter-generations)
        ((string->duration str)
         =>
         filter-by-duration)
        (else #f)))

(define (show-what-to-remove/install remove install dry-run?)
  "Given the manifest entries listed in REMOVE and INSTALL, display the
packages that will/would be installed and removed."
  ;; TODO: Report upgrades more clearly.
  (match remove
    ((($ <manifest-entry> name version output path _) ..1)
     (let ((len    (length name))
           (remove (map (cut format #f "  ~a-~a\t~a\t~a" <> <> <> <>)
                        name version output path)))
       (if dry-run?
           (format (current-error-port)
                   (N_ "The following package would be removed:~%~{~a~%~}~%"
                       "The following packages would be removed:~%~{~a~%~}~%"
                       len)
                   remove)
           (format (current-error-port)
                   (N_ "The following package will be removed:~%~{~a~%~}~%"
                       "The following packages will be removed:~%~{~a~%~}~%"
                       len)
                   remove))))
    (_ #f))
  (match install
    ((($ <manifest-entry> name version output path _) ..1)
     (let ((len     (length name))
           (install (map (cut format #f "   ~a-~a\t~a\t~a" <> <> <> <>)
                         name version output path)))
       (if dry-run?
           (format (current-error-port)
                   (N_ "The following package would be installed:~%~{~a~%~}~%"
                       "The following packages would be installed:~%~{~a~%~}~%"
                       len)
                   install)
           (format (current-error-port)
                   (N_ "The following package will be installed:~%~{~a~%~}~%"
                       "The following packages will be installed:~%~{~a~%~}~%"
                       len)
                   install))))
    (_ #f)))


;;;
;;; Package specifications.
;;;

(define (find-packages-by-description rx)
  "Return the list of packages whose name, synopsis, or description matches
RX."
  (define (same-location? p1 p2)
    ;; Compare locations of two packages.
    (equal? (package-location p1) (package-location p2)))

  (delete-duplicates
   (sort
    (fold-packages (lambda (package result)
                     (define matches?
                       (cut regexp-exec rx <>))

                     (if (or (matches? (gettext (package-name package)))
                             (and=> (package-synopsis package)
                                    (compose matches? gettext))
                             (and=> (package-description package)
                                    (compose matches? gettext)))
                         (cons package result)
                         result))
                   '())
    (lambda (p1 p2)
      (string<? (package-name p1)
                (package-name p2))))
   same-location?))

(define (input->name+path input)
  "Convert the name/package/sub-drv tuple INPUT to a name/store-path tuple."
  (let loop ((input input))
    (match input
      ((name (? package? package))
       (loop `(,name ,package "out")))
      ((name (? package? package) sub-drv)
       `(,name ,(package-output (%store) package sub-drv)))
      (_
       input))))

(define %sigint-prompt
  ;; The prompt to jump to upon SIGINT.
  (make-prompt-tag "interruptible"))

(define (call-with-sigint-handler thunk handler)
  "Call THUNK and return its value.  Upon SIGINT, call HANDLER with the signal
number in the context of the continuation of the call to this function, and
return its return value."
  (call-with-prompt %sigint-prompt
                    (lambda ()
                      (sigaction SIGINT
                        (lambda (signum)
                          (sigaction SIGINT SIG_DFL)
                          (abort-to-prompt %sigint-prompt signum)))
                      (dynamic-wind
                        (const #t)
                        thunk
                        (cut sigaction SIGINT SIG_DFL)))
                    (lambda (k signum)
                      (handler signum))))

(define-syntax-rule (waiting exp fmt rest ...)
  "Display the given message while EXP is being evaluated."
  (let* ((message (format #f fmt rest ...))
         (blank   (make-string (string-length message) #\space)))
    (display message (current-error-port))
    (force-output (current-error-port))
    (call-with-sigint-handler
     (lambda ()
       (dynamic-wind
         (const #f)
         (lambda () exp)
         (lambda ()
           ;; Clear the line.
           (display #\cr (current-error-port))
           (display blank (current-error-port))
           (display #\cr (current-error-port))
           (force-output (current-error-port)))))
     (lambda (signum)
       (format (current-error-port) "  interrupted by signal ~a~%" SIGINT)
       #f))))

(define-syntax-rule (leave-on-EPIPE exp ...)
  "Run EXP... in a context when EPIPE errors are caught and lead to 'exit'
with successful exit code.  This is useful when writing to the standard output
may lead to EPIPE, because the standard output is piped through 'head' or
similar."
  (catch 'system-error
    (lambda ()
      exp ...)
    (lambda args
      ;; We really have to exit this brutally, otherwise Guile eventually
      ;; attempts to flush all the ports, leading to an uncaught EPIPE down
      ;; the path.
      (if (= EPIPE (system-error-errno args))
          (primitive-_exit 0)
          (apply throw args)))))

(define* (specification->package+output spec #:optional (output "out"))
  "Return the package and output specified by SPEC, or #f and #f; SPEC may
optionally contain a version number and an output name, as in these examples:

  guile
  guile-2.0.9
  guile:debug
  guile-2.0.9:debug

If SPEC does not specify a version number, return the preferred newest
version; if SPEC does not specify an output, return OUTPUT."
  (define (ensure-output p sub-drv)
    (if (member sub-drv (package-outputs p))
        sub-drv
        (leave (_ "package `~a' lacks output `~a'~%")
               (package-full-name p)
               sub-drv)))

  (let-values (((name version sub-drv)
                (package-specification->name+version+output spec output)))
    (match (find-best-packages-by-name name version)
      ((p)
       (values p (ensure-output p sub-drv)))
      ((p p* ...)
       (warning (_ "ambiguous package specification `~a'~%")
                spec)
       (warning (_ "choosing ~a from ~a~%")
                (package-full-name p)
                (location->string (package-location p)))
       (values p (ensure-output p sub-drv)))
      (()
       (leave (_ "~a: package not found~%") spec)))))

(define (upgradeable? name current-version current-path)
  "Return #t if there's a version of package NAME newer than CURRENT-VERSION,
or if the newest available version is equal to CURRENT-VERSION but would have
an output path different than CURRENT-PATH."
  (match (vhash-assoc name (find-newest-available-packages))
    ((_ candidate-version pkg . rest)
     (case (version-compare candidate-version current-version)
       ((>) #t)
       ((<) #f)
       ((=) (let ((candidate-path (derivation->output-path
                                   (package-derivation (%store) pkg))))
              (not (string=? current-path candidate-path))))))
    (#f #f)))

(define ftp-open*
  ;; Memoizing version of `ftp-open'.  The goal is to avoid initiating a new
  ;; FTP connection for each package, esp. since most of them are to the same
  ;; server.  This has a noticeable impact when doing "guix upgrade -u".
  (memoize ftp-open))

(define (check-package-freshness package)
  "Check whether PACKAGE has a newer version available upstream, and report
it."
  ;; TODO: Automatically inject the upstream version when desired.

  (catch #t
    (lambda ()
      (when (false-if-exception (gnu-package? package))
        (let ((name      (package-name package))
              (full-name (package-full-name package)))
          (match (waiting (latest-release name
                                          #:ftp-open ftp-open*
                                          #:ftp-close (const #f))
                          (_ "looking for the latest release of GNU ~a...") name)
            ((latest-version . _)
             (when (version>? latest-version full-name)
               (format (current-error-port)
                       (_ "~a: note: using ~a \
but ~a is available upstream~%")
                       (location->string (package-location package))
                       full-name latest-version)))
            (_ #t)))))
    (lambda (key . args)
      ;; Silently ignore networking errors rather than preventing
      ;; installation.
      (case key
        ((getaddrinfo-error ftp-error) #f)
        (else (apply throw key args))))))


;;;
;;; Search paths.
;;;

(define* (search-path-environment-variables entries profile
                                            #:optional (getenv getenv))
  "Return environment variable definitions that may be needed for the use of
ENTRIES, a list of manifest entries, in PROFILE.  Use GETENV to determine the
current settings and report only settings not already effective."

  ;; Prefer ~/.guix-profile to the real profile directory name.
  (let ((profile (if (and %user-profile-directory
                          (false-if-exception
                           (string=? (readlink %user-profile-directory)
                                     profile)))
                     %user-profile-directory
                     profile)))

    ;; The search path info is not stored in the manifest.  Thus, we infer the
    ;; search paths from same-named packages found in the distro.

    (define manifest-entry->package
      (match-lambda
       (($ <manifest-entry> name version)
        (match (append (find-packages-by-name name version)
                       (find-packages-by-name name))
          ((p _ ...) p)
          (_ #f)))))

    (define search-path-definition
      (match-lambda
       (($ <search-path-specification> variable directories separator)
        (let ((values      (or (and=> (getenv variable)
                                      (cut string-tokenize* <> separator))
                               '()))
              (directories (filter file-exists?
                                   (map (cut string-append profile
                                             "/" <>)
                                        directories))))
          (if (every (cut member <> values) directories)
              #f
              (format #f "export ~a=\"~a\""
                      variable
                      (string-join directories separator)))))))

    (let* ((packages     (filter-map manifest-entry->package entries))
           (search-paths (delete-duplicates
                          (append-map package-native-search-paths
                                      packages))))
      (filter-map search-path-definition search-paths))))

(define (display-search-paths entries profile)
  "Display the search path environment variables that may need to be set for
ENTRIES, a list of manifest entries, in the context of PROFILE."
  (let ((settings (search-path-environment-variables entries profile)))
    (unless (null? settings)
      (format #t (_ "The following environment variable definitions may be needed:~%"))
      (format #t "~{   ~a~%~}" settings))))

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

(define %default-options
  ;; Alist of default option values.
  `((profile . ,%current-profile)
    (max-silent-time . 3600)
    (verbosity . 0)
    (substitutes? . #t)))

(define (show-help)
  (display (_ "Usage: guix package [OPTION]... PACKAGES...
Install, remove, or upgrade PACKAGES in a single transaction.\n"))
  (display (_ "
  -i, --install=PACKAGE  install PACKAGE"))
  (display (_ "
  -e, --install-from-expression=EXP
                         install the package EXP evaluates to"))
  (display (_ "
  -r, --remove=PACKAGE   remove PACKAGE"))
  (display (_ "
  -u, --upgrade[=REGEXP] upgrade all the installed packages matching REGEXP"))
  (display (_ "
      --roll-back        roll back to the previous generation"))
  (display (_ "
      --search-paths     display needed environment variable definitions"))
  (display (_ "
  -l, --list-generations[=PATTERN]
                         list generations matching PATTERN"))
  (display (_ "
  -d, --delete-generations[=PATTERN]
                         delete generations matching PATTERN"))
  (display (_ "
  -p, --profile=PROFILE  use PROFILE instead of the user's default profile"))
  (newline)
  (display (_ "
      --bootstrap        use the bootstrap Guile to build the profile"))
  (display (_ "
      --verbose          produce verbose output"))
  (newline)
  (display (_ "
  -s, --search=REGEXP    search in synopsis and description using REGEXP"))
  (display (_ "
  -I, --list-installed[=REGEXP]
                         list installed packages matching REGEXP"))
  (display (_ "
  -A, --list-available[=REGEXP]
                         list available packages matching REGEXP"))
  (newline)
  (show-build-options-help)
  (newline)
  (display (_ "
  -h, --help             display this help and exit"))
  (display (_ "
  -V, --version          display version information and exit"))
  (newline)
  (show-bug-report-information))

(define %options
  ;; Specification 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 package")))

         (option '(#\i "install") #f #t
                 (lambda (opt name arg result arg-handler)
                   (let arg-handler ((arg arg) (result result))
                     (values (if arg
                                 (alist-cons 'install arg result)
                                 result)
                             arg-handler))))
         (option '(#\e "install-from-expression") #t #f
                 (lambda (opt name arg result arg-handler)
                   (values (alist-cons 'install (read/eval-package-expression arg)
                                       result)
                           #f)))
         (option '(#\r "remove") #f #t
                 (lambda (opt name arg result arg-handler)
                   (let arg-handler ((arg arg) (result result))
                     (values (if arg
                                 (alist-cons 'remove arg result)
                                 result)
                             arg-handler))))
         (option '(#\u "upgrade") #f #t
                 (lambda (opt name arg result arg-handler)
                   (let arg-handler ((arg arg) (result result))
                     (values (alist-cons 'upgrade arg
                                         ;; Delete any prior "upgrade all"
                                         ;; command, or else "--upgrade gcc"
                                         ;; would upgrade everything.
                                         (delete '(upgrade . #f) result))
                             arg-handler))))
         (option '("roll-back") #f #f
                 (lambda (opt name arg result arg-handler)
                   (values (alist-cons 'roll-back? #t result)
                           #f)))
         (option '(#\l "list-generations") #f #t
                 (lambda (opt name arg result arg-handler)
                   (values (cons `(query list-generations ,(or arg ""))
                                 result)
                           #f)))
         (option '(#\d "delete-generations") #f #t
                 (lambda (opt name arg result arg-handler)
                   (values (alist-cons 'delete-generations (or arg "")
                                       result)
                           #f)))
         (option '("search-paths") #f #f
                 (lambda (opt name arg result arg-handler)
                   (values (cons `(query search-paths) result)
                           #f)))
         (option '(#\p "profile") #t #f
                 (lambda (opt name arg result arg-handler)
                   (values (alist-cons 'profile arg
                                       (alist-delete 'profile result))
                           #f)))
         (option '(#\n "dry-run") #f #f
                 (lambda (opt name arg result arg-handler)
                   (values (alist-cons 'dry-run? #t result)
                           #f)))
         (option '("bootstrap") #f #f
                 (lambda (opt name arg result arg-handler)
                   (values (alist-cons 'bootstrap? #t result)
                           #f)))
         (option '("verbose") #f #f
                 (lambda (opt name arg result arg-handler)
                   (values (alist-cons 'verbose? #t result)
                           #f)))
         (option '(#\s "search") #t #f
                 (lambda (opt name arg result arg-handler)
                   (values (cons `(query search ,(or arg ""))
                                 result)
                           #f)))
         (option '(#\I "list-installed") #f #t
                 (lambda (opt name arg result arg-handler)
                   (values (cons `(query list-installed ,(or arg ""))
                                 result)
                           #f)))
         (option '(#\A "list-available") #f #t
                 (lambda (opt name arg result arg-handler)
                   (values (cons `(query list-available ,(or arg ""))
                                 result)
                           #f)))

         %standard-build-options))

(define (options->installable opts manifest)
  "Given MANIFEST, the current manifest, and OPTS, the result of 'args-fold',
return the new list of manifest entries."
  (define (deduplicate deps)
    ;; Remove duplicate entries from DEPS, a list of propagated inputs, where
    ;; each input is a name/path tuple.
    (define (same? d1 d2)
      (match d1
        ((_ p1)
         (match d2
           ((_ p2) (eq? p1 p2))
           (_      #f)))
        ((_ p1 out1)
         (match d2
           ((_ p2 out2)
            (and (string=? out1 out2)
                 (eq? p1 p2)))
           (_ #f)))))

    (delete-duplicates deps same?))

  (define (package->manifest-entry p output)
    ;; Return a manifest entry for the OUTPUT of package P.
    (check-package-freshness p)
    ;; When given a package via `-e', install the first of its
    ;; outputs (XXX).
    (let* ((output (or output (car (package-outputs p))))
           (path   (package-output (%store) p output))
           (deps   (deduplicate (package-transitive-propagated-inputs p))))
      (manifest-entry
       (name (package-name p))
       (version (package-version p))
       (output output)
       (path path)
       (dependencies (map input->name+path deps))
       (inputs (cons (list (package-name p) p output)
                     deps)))))

  (define upgrade-regexps
    (filter-map (match-lambda
                 (('upgrade . regexp)
                  (make-regexp (or regexp "")))
                 (_ #f))
                opts))

  (define packages-to-upgrade
    (match upgrade-regexps
      (()
       '())
      ((_ ...)
       (let ((newest (find-newest-available-packages)))
         (filter-map (match-lambda
                      (($ <manifest-entry> name version output path _)
                       (and (any (cut regexp-exec <> name)
                                 upgrade-regexps)
                            (upgradeable? name version path)
                            (let ((output (or output "out")))
                              (call-with-values
                                  (lambda ()
                                    (specification->package+output name output))
                                list))))
                      (_ #f))
                     (manifest-entries manifest))))))

  (define to-upgrade
    (map (match-lambda
          ((package output)
           (package->manifest-entry package output)))
         packages-to-upgrade))

  (define packages-to-install
    (filter-map (match-lambda
                 (('install . (? package? p))
                  (list p "out"))
                 (('install . (? string? spec))
                  (and (not (store-path? spec))
                       (let-values (((package output)
                                     (specification->package+output spec)))
                         (and package (list package output)))))
                 (_ #f))
                opts))

  (define to-install
    (append (map (match-lambda
                  ((package output)
                   (package->manifest-entry package output)))
                 packages-to-install)
            (filter-map (match-lambda
                         (('install . (? package?))
                          #f)
                         (('install . (? store-path? path))
                          (let-values (((name version)
                                        (package-name->name+version
                                         (store-path-package-name path))))
                            (manifest-entry
                             (name name)
                             (version version)
                             (output #f)
                             (path path))))
                         (_ #f))
                        opts)))

  (append to-upgrade to-install))

(define (options->removable options manifest)
  "Given options, return the list of manifest patterns of packages to be
removed from MANIFEST."
  (filter-map (match-lambda
               (('remove . spec)
                (call-with-values
                    (lambda ()
                      (package-specification->name+version+output spec))
                  (lambda (name version output)
                    (manifest-pattern
                      (name name)
                      (version version)
                      (output output)))))
               (_ #f))
              options))

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

(define (guix-package . args)
  (define (parse-options)
    ;; Return the alist of option values.
    (args-fold* args %options
                (lambda (opt name arg result arg-handler)
                  (leave (_ "~A: unrecognized option~%") name))
                (lambda (arg result arg-handler)
                  (if arg-handler
                      (arg-handler arg result)
                      (leave (_ "~A: extraneous argument~%") arg)))
                %default-options
                #f))

  (define (guile-missing?)
    ;; Return #t if %GUILE-FOR-BUILD is not available yet.
    (let ((out (derivation->output-path (%guile-for-build))))
      (not (valid-path? (%store) out))))

  (define (ensure-default-profile)
    ;; Ensure the default profile symlink and directory exist and are
    ;; writable.

    (define (rtfm)
      (format (current-error-port)
              (_ "Try \"info '(guix) Invoking guix package'\" for \
more information.~%"))
      (exit 1))

    ;; Create ~/.guix-profile if it doesn't exist yet.
    (when (and %user-profile-directory
               %current-profile
               (not (false-if-exception
                     (lstat %user-profile-directory))))
      (symlink %current-profile %user-profile-directory))

    (let ((s (stat %profile-directory #f)))
      ;; Attempt to create /…/profiles/per-user/$USER if needed.
      (unless (and s (eq? 'directory (stat:type s)))
        (catch 'system-error
          (lambda ()
            (mkdir-p %profile-directory))
          (lambda args
            ;; Often, we cannot create %PROFILE-DIRECTORY because its
            ;; parent directory is root-owned and we're running
            ;; unprivileged.
            (format (current-error-port)
                    (_ "error: while creating directory `~a': ~a~%")
                    %profile-directory
                    (strerror (system-error-errno args)))
            (format (current-error-port)
                    (_ "Please create the `~a' directory, with you as the owner.~%")
                    %profile-directory)
            (rtfm))))

      ;; Bail out if it's not owned by the user.
      (unless (or (not s) (= (stat:uid s) (getuid)))
        (format (current-error-port)
                (_ "error: directory `~a' is not owned by you~%")
                %profile-directory)
        (format (current-error-port)
                (_ "Please change the owner of `~a' to user ~s.~%")
                %profile-directory (or (getenv "USER") (getuid)))
        (rtfm))))

  (define (process-actions opts)
    ;; Process any install/remove/upgrade action from OPTS.

    (define dry-run? (assoc-ref opts 'dry-run?))
    (define verbose? (assoc-ref opts 'verbose?))
    (define profile  (assoc-ref opts 'profile))

    (define (same-package? entry name output)
      (match entry
        (($ <manifest-entry> entry-name _ entry-output _ ...)
         (and (equal? name entry-name)
              (equal? output entry-output)))))

    (define current-generation-number
      (generation-number profile))

    (define (display-and-delete number)
      (let ((generation (generation-file-name profile number)))
        (unless (zero? number)
          (format #t (_ "deleting ~a~%") generation)
          (delete-file generation))))

    (define (delete-generation number)
      (let* ((previous-number (previous-generation-number profile number))
             (previous-generation
              (generation-file-name profile previous-number)))
        (cond ((zero? number))  ; do not delete generation 0
              ((and (= number current-generation-number)
                    (not (file-exists? previous-generation)))
               (link-to-empty-profile previous-generation)
               (switch-to-previous-generation profile)
               (display-and-delete number))
              ((= number current-generation-number)
               (roll-back profile)
               (display-and-delete number))
              (else
               (display-and-delete number)))))

    ;; First roll back if asked to.
    (cond ((and (assoc-ref opts 'roll-back?) (not dry-run?))
           (begin
             (roll-back profile)
             (process-actions (alist-delete 'roll-back? opts))))
          ((and (assoc-ref opts 'delete-generations)
                (not dry-run?))
           (filter-map
            (match-lambda
             (('delete-generations . pattern)
              (cond ((not (file-exists? profile)) ; XXX: race condition
                     (leave (_ "profile '~a' does not exist~%")
                            profile))
                    ((string-null? pattern)
                     (let ((numbers (generation-numbers profile)))
                       (if (equal? numbers '(0))
                           (exit 0)
                           (for-each display-and-delete
                                     (delete current-generation-number
                                             numbers)))))
                    ;; Do not delete the zeroth generation.
                    ((equal? 0 (string->number pattern))
                     (exit 0))

                    ;; If PATTERN is a duration, match generations that are
                    ;; older than the specified duration.
                    ((matching-generations pattern profile
                                           #:duration-relation >)
                     =>
                     (lambda (numbers)
                       (if (null-list? numbers)
                           (exit 1)
                           (for-each delete-generation numbers))))
                    (else
                     (leave (_ "invalid syntax: ~a~%")
                            pattern)))

              (process-actions
               (alist-delete 'delete-generations opts)))
             (_ #f))
            opts))
          (else
           (let* ((manifest (profile-manifest profile))
                  (install  (options->installable opts manifest))
                  (remove   (options->removable opts manifest))
                  (entries
                   (append install
                           (fold (lambda (package result)
                                   (match package
                                     (($ <manifest-entry> name _ out _ ...)
                                      (filter (negate
                                               (cut same-package? <>
                                                    name out))
                                              result))))
                                 (manifest-entries
                                  (manifest-remove manifest remove))
                                 install)))
                  (new      (make-manifest entries)))

             (when (equal? profile %current-profile)
               (ensure-default-profile))

             (if (manifest=? new manifest)
                 (format (current-error-port) (_ "nothing to be done~%"))
                 (let ((prof-drv (profile-derivation (%store) new))
                       (remove   (manifest-matching-entries manifest remove)))
                   (show-what-to-remove/install remove install dry-run?)
                   (show-what-to-build (%store) (list prof-drv)
                                       #:use-substitutes?
                                       (assoc-ref opts 'substitutes?)
                                       #:dry-run? dry-run?)

                   (or dry-run?
                       (let* ((prof   (derivation->output-path prof-drv))
                              (number (generation-number profile))

                              ;; Always use NUMBER + 1 for the new profile,
                              ;; possibly overwriting a "previous future
                              ;; generation".
                              (name   (generation-file-name profile
                                                            (+ 1 number))))
                         (and (build-derivations (%store) (list prof-drv))
                              (let ((count (length entries)))
                                (switch-symlinks name prof)
                                (switch-symlinks profile name)
                                (format #t (N_ "~a package in profile~%"
                                               "~a packages in profile~%"
                                               count)
                                        count)
                                (display-search-paths entries
                                                      profile)))))))))))

  (define (process-query opts)
    ;; Process any query specified by OPTS.  Return #t when a query was
    ;; actually processed, #f otherwise.
    (let ((profile  (assoc-ref opts 'profile)))
      (match (assoc-ref opts 'query)
        (('list-generations pattern)
         (define (list-generation number)
           (unless (zero? number)
             (let ((header (format #f (_ "Generation ~a\t~a") number
                                   (date->string
                                    (time-utc->date
                                     (generation-time profile number))
                                    "~b ~d ~Y ~T")))
                   (current (generation-number profile)))
               (if (= number current)
                   (format #t (_ "~a\t(current)~%") header)
                   (format #t "~a~%" header)))
             (for-each (match-lambda
                        (($ <manifest-entry> name version output location _)
                         (format #t "  ~a\t~a\t~a\t~a~%"
                                 name version output location)))

                       ;; Show most recently installed packages last.
                       (reverse
                        (manifest-entries
                         (profile-manifest
                          (generation-file-name profile number)))))
             (newline)))

         (cond ((not (file-exists? profile)) ; XXX: race condition
                (leave (_ "profile '~a' does not exist~%")
                       profile))
               ((string-null? pattern)
                (let ((numbers (generation-numbers profile)))
                  (leave-on-EPIPE
                   (if (equal? numbers '(0))
                       (exit 0)
                       (for-each list-generation numbers)))))
               ((matching-generations pattern profile)
                =>
                (lambda (numbers)
                  (if (null-list? numbers)
                      (exit 1)
                      (leave-on-EPIPE
                       (for-each list-generation numbers)))))
               (else
                (leave (_ "invalid syntax: ~a~%")
                       pattern)))
         #t)

        (('list-installed regexp)
         (let* ((regexp    (and regexp (make-regexp regexp)))
                (manifest  (profile-manifest profile))
                (installed (manifest-entries manifest)))
           (leave-on-EPIPE
            (for-each (match-lambda
                       (($ <manifest-entry> name version output path _)
                        (when (or (not regexp)
                                  (regexp-exec regexp name))
                          (format #t "~a\t~a\t~a\t~a~%"
                                  name (or version "?") output path))))

                      ;; Show most recently installed packages last.
                      (reverse installed)))
           #t))

        (('list-available regexp)
         (let* ((regexp    (and regexp (make-regexp regexp)))
                (available (fold-packages
                            (lambda (p r)
                              (let ((n (package-name p)))
                                (if regexp
                                    (if (regexp-exec regexp n)
                                        (cons p r)
                                        r)
                                    (cons p r))))
                            '())))
           (leave-on-EPIPE
            (for-each (lambda (p)
                        (format #t "~a\t~a\t~a\t~a~%"
                                (package-name p)
                                (package-version p)
                                (string-join (package-outputs p) ",")
                                (location->string (package-location p))))
                      (sort available
                            (lambda (p1 p2)
                              (string<? (package-name p1)
                                        (package-name p2))))))
           #t))

        (('search regexp)
         (let ((regexp (make-regexp regexp regexp/icase)))
           (leave-on-EPIPE
            (for-each (cute package->recutils <> (current-output-port))
                      (find-packages-by-description regexp)))
           #t))

        (('search-paths)
         (let* ((manifest (profile-manifest profile))
                (entries  (manifest-entries manifest))
                (packages (map manifest-entry-name entries))
                (settings (search-path-environment-variables entries profile
                                                             (const #f))))
           (format #t "~{~a~%~}" settings)
           #t))

        (_ #f))))

  (let ((opts (parse-options)))
    (or (process-query opts)
        (with-error-handling
          (parameterize ((%store (open-connection)))
            (set-build-options-from-command-line (%store) opts)

            (parameterize ((%guile-for-build
                            (package-derivation (%store)
                                                (if (assoc-ref opts 'bootstrap?)
                                                    %bootstrap-guile
                                                    guile-final))))
              (process-actions opts)))))))