summaryrefslogtreecommitdiff
path: root/guix/scripts/pack.scm
blob: 8ecdcb823f8ca3c638d4a5f82059a04c00058715 (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
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
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2015, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017, 2018 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2018 Konrad Hinsen <konrad.hinsen@fastmail.net>
;;; Copyright © 2018 Chris Marusich <cmmarusich@gmail.com>
;;; Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2020 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2020 Eric Bavier <bavier@posteo.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 pack)
  #:use-module (guix scripts)
  #:use-module (guix ui)
  #:use-module (guix gexp)
  #:use-module (guix utils)
  #:use-module (guix store)
  #:use-module ((guix status) #:select (with-status-verbosity))
  #:use-module ((guix self) #:select (make-config.scm))
  #:use-module (guix grafts)
  #:autoload   (guix inferior) (inferior-package?
                                inferior-package-name
                                inferior-package-version)
  #:use-module (guix monads)
  #:use-module (guix modules)
  #:use-module (guix packages)
  #:use-module (guix profiles)
  #:use-module (guix describe)
  #:use-module (guix derivations)
  #:use-module (guix search-paths)
  #:use-module (guix build-system gnu)
  #:use-module (guix scripts build)
  #:use-module (guix transformations)
  #:use-module ((guix self) #:select (make-config.scm))
  #:use-module (gnu packages)
  #:use-module (gnu packages bootstrap)
  #:use-module ((gnu packages compression) #:hide (zip))
  #:use-module (gnu packages guile)
  #:use-module (gnu packages base)
  #:autoload   (gnu packages package-management) (guix)
  #:autoload   (gnu packages gnupg) (guile-gcrypt)
  #:autoload   (gnu packages guile) (guile2.0-json guile-json)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-9)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-37)
  #:use-module (ice-9 match)
  #:export (compressor?
            compressor-name
            compressor-extenstion
            compressor-command
            %compressors
            lookup-compressor
            self-contained-tarball
            docker-image
            squashfs-image

            %formats
            guix-pack))

;; Type of a compression tool.
(define-record-type <compressor>
  (compressor name extension command)
  compressor?
  (name       compressor-name)      ;string (e.g., "gzip")
  (extension  compressor-extension) ;string (e.g., ".lz")
  (command    compressor-command))  ;gexp (e.g., #~("/gnu/store/…/gzip" "-9n"))

(define %compressors
  ;; Available compression tools.
  (list (compressor "gzip"  ".gz"
                    #~(#+(file-append gzip "/bin/gzip") "-9n"))
        (compressor "lzip"  ".lz"
                    #~(#+(file-append lzip "/bin/lzip") "-9"))
        (compressor "xz"    ".xz"
                    #~(#+(file-append xz "/bin/xz") "-e"))
        (compressor "bzip2" ".bz2"
                    #~(#+(file-append bzip2 "/bin/bzip2") "-9"))
        (compressor "zstd" ".zst"
                    ;; The default level 3 compresses better than gzip in a
                    ;; fraction of the time, while the highest level 19
                    ;; (de)compresses more slowly and worse than xz.
                    #~(#+(file-append zstd "/bin/zstd") "-3"))
        (compressor "none" "" #f)))

;; This one is only for use in this module, so don't put it in %compressors.
(define bootstrap-xz
  (compressor "bootstrap-xz" ".xz"
              #~(#+(file-append %bootstrap-coreutils&co "/bin/xz") "-e")))

(define (lookup-compressor name)
  "Return the compressor object called NAME.  Error out if it could not be
found."
  (or (find (match-lambda
              (($ <compressor> name*)
               (string=? name* name)))
            %compressors)
      (leave (G_ "~a: compressor not found~%") name)))

(define not-config?
  ;; Select (guix …) and (gnu …) modules, except (guix config).
  (match-lambda
    (('guix 'config) #f)
    (('guix _ ...) #t)
    (('gnu _ ...) #t)
    (_ #f)))

(define gcrypt-sqlite3&co
  ;; Guile-Gcrypt, Guile-SQLite3, and their propagated inputs.
  (append-map (lambda (package)
                (cons package
                      (match (package-transitive-propagated-inputs package)
                        (((labels packages) ...)
                         packages))))
              (list guile-gcrypt guile-sqlite3)))

(define (store-database items)
  "Return a directory containing a store database where all of ITEMS and their
dependencies are registered."
  (define schema
    (local-file (search-path %load-path
                             "guix/store/schema.sql")))


  (define labels
    (map (lambda (n)
           (string-append "closure" (number->string n)))
         (iota (length items))))

  (define build
    (with-extensions gcrypt-sqlite3&co
      (with-imported-modules `(((guix config) => ,(make-config.scm))
                               ,@(source-module-closure
                                  '((guix build store-copy)
                                    (guix store database))
                                  #:select? not-config?))
        #~(begin
            (use-modules (guix store database)
                         (guix build store-copy)
                         (srfi srfi-1))

            (define (read-closure closure)
              (call-with-input-file closure read-reference-graph))

            (define db-file
              (store-database-file #:state-directory #$output))

            ;; Make sure non-ASCII file names are properly handled.
            (setenv "GUIX_LOCPATH"
                    #+(file-append glibc-utf8-locales "/lib/locale"))
            (setlocale LC_ALL "en_US.utf8")

            (sql-schema #$schema)
            (let ((items (append-map read-closure '#$labels)))
              (with-database db-file db
                (register-items db items
                                #:registration-time %epoch)))))))

  (computed-file "store-database" build
                 #:options `(#:references-graphs ,(zip labels items))))

(define* (self-contained-tarball name profile
                                 #:key target
                                 (profile-name "guix-profile")
                                 deduplicate?
                                 entry-point
                                 (compressor (first %compressors))
                                 localstatedir?
                                 (symlinks '())
                                 (archiver tar))
  "Return a self-contained tarball containing a store initialized with the
closure of PROFILE, a derivation.  The tarball contains /gnu/store; if
LOCALSTATEDIR? is true, it also contains /var/guix, including /var/guix/db
with a properly initialized store database.

SYMLINKS must be a list of (SOURCE -> TARGET) tuples denoting symlinks to be
added to the pack."
  (define database
    (and localstatedir?
         (file-append (store-database (list profile))
                      "/db/db.sqlite")))

  (define set-utf8-locale
    ;; Arrange to not depend on 'glibc-utf8-locales' when using '--bootstrap'.
    (and (or (not (profile? profile))
             (profile-locales? profile))
         #~(begin
             (setenv "GUIX_LOCPATH"
                     #+(file-append glibc-utf8-locales "/lib/locale"))
             (setlocale LC_ALL "en_US.utf8"))))

  (define (import-module? module)
    ;; Since we don't use deduplication support in 'populate-store', don't
    ;; import (guix store deduplication) and its dependencies, which includes
    ;; Guile-Gcrypt.  That way we can run tests with '--bootstrap'.
    (and (not-config? module)
         (not (equal? '(guix store deduplication) module))))

  (define build
    (with-imported-modules (source-module-closure
                            `((guix build utils)
                              (guix build union)
                              (gnu build install))
                            #:select? import-module?)
      #~(begin
          (use-modules (guix build utils)
                       ((guix build union) #:select (relative-file-name))
                       (gnu build install)
                       (srfi srfi-1)
                       (srfi srfi-26)
                       (ice-9 match))

          (define %root "root")

          (define symlink->directives
            ;; Return "populate directives" to make the given symlink and its
            ;; parent directories.
            (match-lambda
              ((source '-> target)
               (let ((target (string-append #$profile "/" target))
                     (parent (dirname source)))
                 ;; Never add a 'directory' directive for "/" so as to
                 ;; preserve its ownnership when extracting the archive (see
                 ;; below), and also because this would lead to adding the
                 ;; same entries twice in the tarball.
                 `(,@(if (string=? parent "/")
                         '()
                         `((directory ,parent)))
                   (,source
                    -> ,(relative-file-name parent target)))))))

          (define directives
            ;; Fully-qualified symlinks.
            (append-map symlink->directives '#$symlinks))

          ;; The --sort option was added to GNU tar in version 1.28, released
          ;; 2014-07-28.  For testing, we use the bootstrap tar, which is
          ;; older and doesn't support it.
          (define tar-supports-sort?
            (zero? (system* (string-append #+archiver "/bin/tar")
                            "cf" "/dev/null" "--files-from=/dev/null"
                            "--sort=name")))

          ;; Make sure non-ASCII file names are properly handled.
          #+set-utf8-locale

          ;; Add 'tar' to the search path.
          (setenv "PATH" #+(file-append archiver "/bin"))

          ;; Note: there is not much to gain here with deduplication and there
          ;; is the overhead of the '.links' directory, so turn it off.
          ;; Furthermore GNU tar < 1.30 sometimes fails to extract tarballs
          ;; with hard links:
          ;; <http://lists.gnu.org/archive/html/bug-tar/2017-11/msg00009.html>.
          (populate-single-profile-directory %root
                                             #:profile #$profile
                                             #:profile-name #$profile-name
                                             #:closure "profile"
                                             #:database #+database)

          ;; Create SYMLINKS.
          (for-each (cut evaluate-populate-directive <> %root)
                    directives)

          ;; Create the tarball.  Use GNU format so there's no file name
          ;; length limitation.
          (with-directory-excursion %root
            (exit
             (zero? (apply system* "tar"
                           #+@(if (compressor-command compressor)
                                  #~("-I"
                                     (string-join
                                      '#+(compressor-command compressor)))
                                  #~())
                           "--format=gnu"

                           ;; Avoid non-determinism in the archive.  Use
                           ;; mtime = 1, not zero, because that is what the
                           ;; daemon does for files in the store (see the
                           ;; 'mtimeStore' constant in local-store.cc.)
                           (if tar-supports-sort? "--sort=name" "--mtime=@1")
                           "--mtime=@1"           ;for files in /var/guix
                           "--owner=root:0"
                           "--group=root:0"

                           "--check-links"
                           "-cvf" #$output
                           ;; Avoid adding / and /var to the tarball, so
                           ;; that the ownership and permissions of those
                           ;; directories will not be overwritten when
                           ;; extracting the archive.  Do not include /root
                           ;; because the root account might have a
                           ;; different home directory.
                           #$@(if localstatedir?
                                  '("./var/guix")
                                  '())

                           (string-append "." (%store-directory))

                           (delete-duplicates
                            (filter-map (match-lambda
                                          (('directory directory)
                                           (string-append "." directory))
                                          ((source '-> _)
                                           (string-append "." source))
                                          (_ #f))
                                        directives)))))))))

  (when entry-point
    (warning (G_ "entry point not supported in the '~a' format~%")
             'tarball))

  (gexp->derivation (string-append name ".tar"
                                   (compressor-extension compressor))
                    build
                    #:target target
                    #:references-graphs `(("profile" ,profile))))

(define (singularity-environment-file profile)
  "Return a shell script that defines the environment variables corresponding
to the search paths of PROFILE."
  (define build
    (with-extensions (list guile-gcrypt)
      (with-imported-modules `(((guix config) => ,(make-config.scm))
                               ,@(source-module-closure
                                  `((guix profiles)
                                    (guix search-paths))
                                  #:select? not-config?))
        #~(begin
            (use-modules (guix profiles) (guix search-paths)
                         (ice-9 match))

            (call-with-output-file #$output
              (lambda (port)
                (for-each (match-lambda
                            ((spec . value)
                             (format port "~a=~a~%export ~a~%"
                                     (search-path-specification-variable spec)
                                     value
                                     (search-path-specification-variable spec))))
                          (profile-search-paths #$profile))))))))

  (computed-file "singularity-environment.sh" build))

(define* (squashfs-image name profile
                         #:key target
                         (profile-name "guix-profile")
                         (compressor (first %compressors))
                         entry-point
                         localstatedir?
                         (symlinks '())
                         (archiver squashfs-tools))
  "Return a squashfs image containing a store initialized with the closure of
PROFILE, a derivation.  The image contains a subset of /gnu/store, empty mount
points for virtual file systems (like procfs), and optional symlinks.

SYMLINKS must be a list of (SOURCE -> TARGET) tuples denoting symlinks to be
added to the pack."
  (define database
    (and localstatedir?
         (file-append (store-database (list profile))
                      "/db/db.sqlite")))

  (define environment
    (singularity-environment-file profile))

  (define symlinks*
    ;; Singularity requires /bin (specifically /bin/sh), so ensure that
    ;; symlink is created.
    (if (find (match-lambda
                (("/bin" . _) #t)
                (_            #f))
              symlinks)
        symlinks
        `(("/bin" -> "bin") ,@symlinks)))

  (define build
    (with-extensions (list guile-gcrypt)
      (with-imported-modules (source-module-closure
                              '((guix build utils)
                                (guix build store-copy)
                                (guix build union)
                                (gnu build install))
                              #:select? not-config?)
        #~(begin
            (use-modules (guix build utils)
                         (guix build store-copy)
                         ((guix build union) #:select (relative-file-name))
                         (gnu build install)
                         (srfi srfi-1)
                         (srfi srfi-26)
                         (ice-9 match))

            (define database #+database)
            (define entry-point #$entry-point)

            (define (mksquashfs args)
              (apply invoke "mksquashfs"
                     `(,@args

                       ;; Do not create a "recovery file" when appending to the
                       ;; file system since it's useless in this case.
                       "-no-recovery"

                       ;; Do not attempt to store extended attributes.
                       ;; See <https://bugs.gnu.org/40043>.
                       "-no-xattrs"

                       ;; Set file times and the file system creation time to
                       ;; one second after the Epoch.
                       "-all-time" "1" "-mkfs-time" "1"

                       ;; Reset all UIDs and GIDs.
                       "-force-uid" "0" "-force-gid" "0")))

            (setenv "PATH" #+(file-append archiver "/bin"))

            ;; We need an empty file in order to have a valid file argument when
            ;; we reparent the root file system.  Read on for why that's
            ;; necessary.
            (with-output-to-file ".empty" (lambda () (display "")))

            ;; Create the squashfs image in several steps.
            ;; Add all store items.  Unfortunately mksquashfs throws away all
            ;; ancestor directories and only keeps the basename.  We fix this
            ;; in the following invocations of mksquashfs.
            (mksquashfs `(,@(map store-info-item
                                 (call-with-input-file "profile"
                                   read-reference-graph))
                          #$environment
                          ,#$output

                          ;; Do not perform duplicate checking because we
                          ;; don't have any dupes.
                          "-no-duplicates"
                          "-comp"
                          ,#+(compressor-name compressor)))

            ;; Here we reparent the store items.  For each sub-directory of
            ;; the store prefix we need one invocation of "mksquashfs".
            (for-each (lambda (dir)
                        (mksquashfs `(".empty"
                                      ,#$output
                                      "-root-becomes" ,dir)))
                      (reverse (string-tokenize (%store-directory)
                                                (char-set-complement (char-set #\/)))))

            ;; Add symlinks and mount points.
            (mksquashfs
             `(".empty"
               ,#$output
               ;; Create SYMLINKS via pseudo file definitions.
               ,@(append-map
                  (match-lambda
                    ((source '-> target)
                     ;; Create relative symlinks to work around a bug in
                     ;; Singularity 2.x:
                     ;;   https://bugs.gnu.org/34913
                     ;;   https://github.com/sylabs/singularity/issues/1487
                     (let ((target (string-append #$profile "/" target)))
                       (list "-p"
                             (string-join
                              ;; name s mode uid gid symlink
                              (list source
                                    "s" "777" "0" "0"
                                    (relative-file-name (dirname source)
                                                        target)))))))
                  '#$symlinks*)

               "-p" "/.singularity.d d 555 0 0"

               ;; Create the environment file.
               "-p" "/.singularity.d/env d 555 0 0"
               "-p" ,(string-append
                      "/.singularity.d/env/90-environment.sh s 777 0 0 "
                      (relative-file-name "/.singularity.d/env"
                                          #$environment))

               ;; Create /.singularity.d/actions, and optionally the 'run'
               ;; script, used by 'singularity run'.
               "-p" "/.singularity.d/actions d 555 0 0"

               ,@(if entry-point
                     `( ;; This one if for Singularity 2.x.
                       "-p"
                       ,(string-append
                         "/.singularity.d/actions/run s 777 0 0 "
                         (relative-file-name "/.singularity.d/actions"
                                             (string-append #$profile "/"
                                                            entry-point)))

                       ;; This one is for Singularity 3.x.
                       "-p"
                       ,(string-append
                         "/.singularity.d/runscript s 777 0 0 "
                         (relative-file-name "/.singularity.d"
                                             (string-append #$profile "/"
                                                            entry-point))))
                     '())

               ;; Create empty mount points.
               "-p" "/proc d 555 0 0"
               "-p" "/sys d 555 0 0"
               "-p" "/dev d 555 0 0"
               "-p" "/home d 555 0 0"))

            (when database
              ;; Initialize /var/guix.
              (install-database-and-gc-roots "var-etc" database #$profile)
              (mksquashfs `("var-etc" ,#$output)))))))

  (gexp->derivation (string-append name
                                   (compressor-extension compressor)
                                   ".squashfs")
                    build
                    #:target target
                    #:references-graphs `(("profile" ,profile))))

(define* (docker-image name profile
                       #:key target
                       (profile-name "guix-profile")
                       (compressor (first %compressors))
                       entry-point
                       localstatedir?
                       (symlinks '())
                       (archiver tar))
  "Return a derivation to construct a Docker image of PROFILE.  The
image is a tarball conforming to the Docker Image Specification, compressed
with COMPRESSOR.  It can be passed to 'docker load'.  If TARGET is true, it
must a be a GNU triplet and it is used to derive the architecture metadata in
the image."
  (define database
    (and localstatedir?
         (file-append (store-database (list profile))
                      "/db/db.sqlite")))

  (define defmod 'define-module)                  ;trick Geiser

  (define build
    ;; Guile-JSON and Guile-Gcrypt are required by (guix docker).
    (with-extensions (list guile-json-3 guile-gcrypt)
      (with-imported-modules `(((guix config) => ,(make-config.scm))
                               ,@(source-module-closure
                                  `((guix docker)
                                    (guix build store-copy)
                                    (guix profiles)
                                    (guix search-paths))
                                  #:select? not-config?))
        #~(begin
            (use-modules (guix docker) (guix build store-copy)
                         (guix profiles) (guix search-paths)
                         (srfi srfi-1) (srfi srfi-19)
                         (ice-9 match))

            (define environment
              (map (match-lambda
                     ((spec . value)
                      (cons (search-path-specification-variable spec)
                            value)))
                   (profile-search-paths #$profile)))

            (define symlink->directives
              ;; Return "populate directives" to make the given symlink and its
              ;; parent directories.
              (match-lambda
                ((source '-> target)
                 (let ((target (string-append #$profile "/" target))
                       (parent (dirname source)))
                   `((directory ,parent)
                     (,source -> ,target))))))

            (define directives
              ;; Create a /tmp directory, as some programs expect it, and
              ;; create SYMLINKS.
              `((directory "/tmp" ,(getuid) ,(getgid) #o1777)
                ,@(append-map symlink->directives '#$symlinks)))

            (define tag
              ;; Compute a meaningful "repository" name, which will show up in
              ;; the output of "docker images".
              (let ((manifest (profile-manifest #$profile)))
                (let loop ((names (map manifest-entry-name
                                       (manifest-entries manifest))))
                  (define str (string-join names "-"))
                  (if (< (string-length str) 40)
                      str
                      (match names
                        ((_) str)
                        ((names ... _) (loop names))))))) ;drop one entry

            (setenv "PATH" #+(file-append archiver "/bin"))

            (build-docker-image #$output
                                (map store-info-item
                                     (call-with-input-file "profile"
                                       read-reference-graph))
                                #$profile
                                #:repository tag
                                #:database #+database
                                #:system (or #$target (utsname:machine (uname)))
                                #:environment environment
                                #:entry-point
                                #$(and entry-point
                                       #~(list (string-append #$profile "/"
                                                              #$entry-point)))
                                #:extra-files directives
                                #:compressor '#+(compressor-command compressor)
                                #:creation-time (make-time time-utc 0 1))))))

  (gexp->derivation (string-append name ".tar"
                                   (compressor-extension compressor))
                    build
                    #:target target
                    #:references-graphs `(("profile" ,profile))))


;;;
;;; Compiling C programs.
;;;

;; A C compiler.  That lowers to a single program that can be passed typical C
;; compiler flags, and it makes sure the whole toolchain is available.
(define-record-type <c-compiler>
  (%c-compiler toolchain guile)
  c-compiler?
  (toolchain c-compiler-toolchain)
  (guile     c-compiler-guile))

(define* (c-compiler #:optional inputs
                     #:key (guile (default-guile)))
  (%c-compiler inputs guile))

(define (bootstrap-c-compiler)
  "Return the C compiler that uses the bootstrap toolchain.  This is used only
by '--bootstrap', for testing purposes."
  (define bootstrap-toolchain
    (list (first (assoc-ref (%bootstrap-inputs) "gcc"))
          (first (assoc-ref (%bootstrap-inputs) "binutils"))
          (first (assoc-ref (%bootstrap-inputs) "libc"))))

  (c-compiler bootstrap-toolchain
              #:guile %bootstrap-guile))

(define-gexp-compiler (c-compiler-compiler (compiler <c-compiler>) system target)
  "Lower COMPILER to a single script that does the right thing."
  (define toolchain
    (or (c-compiler-toolchain compiler)
        (list (first (assoc-ref (standard-packages) "gcc"))
              (first (assoc-ref (standard-packages) "ld-wrapper"))
              (first (assoc-ref (standard-packages) "binutils"))
              (first (assoc-ref (standard-packages) "libc"))
              (gexp-input (first (assoc-ref (standard-packages) "libc"))
                          "static"))))

  (define inputs
    (match (append-map package-propagated-inputs
                       (filter package? toolchain))
      (((labels things . _) ...)
       (append toolchain things))))

  (define search-paths
    (cons $PATH
          (append-map package-native-search-paths
                      (filter package? inputs))))

  (define run
    (with-imported-modules (source-module-closure
                            '((guix build utils)
                              (guix search-paths)))
      #~(begin
          (use-modules (guix build utils) (guix search-paths)
                       (ice-9 match))

          (define (output-file args)
            (let loop ((args args))
              (match args
                (() "a.out")
                (("-o" file _ ...) file)
                ((head rest ...) (loop rest)))))

          (set-search-paths (map sexp->search-path-specification
                                 '#$(map search-path-specification->sexp
                                         search-paths))
                            '#$inputs)

          (let ((output (output-file (command-line))))
            (apply invoke "gcc" (cdr (command-line)))
            (invoke "strip" output)))))

  (when target
    ;; TODO: Yep, we'll have to do it someday!
    (leave (G_ "cross-compilation not implemented here;
please email '~a'~%")
           (@ (guix config) %guix-bug-report-address)))

  (gexp->script "c-compiler" run
                #:guile (c-compiler-guile compiler)))


;;;
;;; Wrapped package.
;;;

(define* (wrapped-package package
                          #:optional
                          (output* "out")
                          (compiler (c-compiler))
                          #:key proot?)
  "Return the OUTPUT of PACKAGE with its binaries wrapped such that they are
relocatable.  When PROOT? is true, include PRoot in the result and use it as a
last resort for relocation."
  (define runner
    (local-file (search-auxiliary-file "run-in-namespace.c")))

  (define audit-source
    (local-file (search-auxiliary-file "pack-audit.c")))

  (define (proot)
    (specification->package "proot-static"))

  (define (fakechroot-library)
    (computed-file "libfakechroot.so"
                   #~(copy-file #$(file-append
                                   (specification->package "fakechroot")
                                   "/lib/fakechroot/libfakechroot.so")
                                #$output)))

  (define (audit-module)
    ;; Return an ld.so audit module for use by the 'fakechroot' execution
    ;; engine that translates file names of all the files ld.so loads.
    (computed-file "pack-audit.so"
                   (with-imported-modules '((guix build utils))
                     #~(begin
                         (use-modules (guix build utils))

                         (copy-file #$audit-source "audit.c")
                         (substitute* "audit.c"
                           (("@STORE_DIRECTORY@")
                            (%store-directory)))

                         (invoke #$compiler "-std=gnu99"
                                 "-shared" "-fPIC" "-Os" "-g0"
                                 "-Wall" "audit.c" "-o" #$output)))))

  (define build
    (with-imported-modules (source-module-closure
                            '((guix build utils)
                              (guix build union)
                              (guix build gremlin)
                              (guix elf)))
      #~(begin
          (use-modules (guix build utils)
                       ((guix build union) #:select (symlink-relative))
                       (guix elf)
                       (guix build gremlin)
                       (ice-9 binary-ports)
                       (ice-9 ftw)
                       (ice-9 match)
                       (ice-9 receive)
                       (srfi srfi-1)
                       (rnrs bytevectors))

          (define input
            ;; The OUTPUT* output of PACKAGE.
            (ungexp package output*))

          (define target
            ;; The output we are producing.
            (ungexp output output*))

          (define (strip-store-prefix file)
            ;; Given a file name like "/gnu/store/…-foo-1.2/bin/foo", return
            ;; "/bin/foo".
            (let* ((len  (string-length (%store-directory)))
                   (base (string-drop file (+ 1 len))))
              (match (string-index base #\/)
                (#f    base)
                (index (string-drop base index)))))

          (define (elf-interpreter elf)
            ;; Return the interpreter of ELF as a string, or #f if ELF has no
            ;; interpreter segment.
            (match (find (lambda (segment)
                           (= (elf-segment-type segment) PT_INTERP))
                         (elf-segments elf))
              (#f #f)                             ;maybe a .so
              (segment
               (let ((bv (make-bytevector (- (elf-segment-memsz segment) 1))))
                 (bytevector-copy! (elf-bytes elf)
                                   (elf-segment-offset segment)
                                   bv 0 (bytevector-length bv))
                 (utf8->string bv)))))

          (define (runpath file)
            ;; Return the RUNPATH of FILE as a list of directories.
            (let* ((bv      (call-with-input-file file get-bytevector-all))
                   (elf     (parse-elf bv))
                   (dyninfo (elf-dynamic-info elf)))
              (or (and=> dyninfo elf-dynamic-info-runpath)
                  '())))

          (define (elf-loader-compile-flags program)
            ;; Return the cpp flags defining macros for the ld.so/fakechroot
            ;; wrapper of PROGRAM.

            ;; TODO: Handle scripts by wrapping their interpreter.
            (if (elf-file? program)
                (let* ((bv      (call-with-input-file program
                                  get-bytevector-all))
                       (elf     (parse-elf bv))
                       (interp  (elf-interpreter elf))
                       (gconv   (and interp
                                     (string-append (dirname interp)
                                                    "/gconv"))))
                  (if interp
                      (list (string-append "-DPROGRAM_INTERPRETER=\""
                                           interp "\"")
                            (string-append "-DFAKECHROOT_LIBRARY=\""
                                           #$(fakechroot-library) "\"")

                            (string-append "-DLOADER_AUDIT_MODULE=\""
                                           #$(audit-module) "\"")

                            ;; XXX: Normally (runpath #$(audit-module)) is
                            ;; enough.  However, to work around
                            ;; <https://sourceware.org/bugzilla/show_bug.cgi?id=26634>
                            ;; (glibc <= 2.32), pass the whole search path of
                            ;; PROGRAM, which presumably is a superset of that
                            ;; of the audit module.
                            (string-append "-DLOADER_AUDIT_RUNPATH={ "
                                           (string-join
                                            (map object->string
                                                 (runpath program))
                                            ", " 'suffix)
                                           "NULL }")
                            (if gconv
                                (string-append "-DGCONV_DIRECTORY=\""
                                               gconv "\"")
                                "-UGCONV_DIRECTORY"))
                      '()))
                '()))

          (define (build-wrapper program)
            ;; Build a user-namespace wrapper for PROGRAM.
            (format #t "building wrapper for '~a'...~%" program)
            (copy-file #$runner "run.c")

            (substitute* "run.c"
              (("@WRAPPED_PROGRAM@") program)
              (("@STORE_DIRECTORY@") (%store-directory)))

            (let* ((base   (strip-store-prefix program))
                   (result (string-append target base))
                   (proot  #$(and proot?
                                  #~(string-drop
                                     #$(file-append (proot) "/bin/proot")
                                     (+ (string-length (%store-directory))
                                        1)))))
              (mkdir-p (dirname result))
              (apply invoke #$compiler "-std=gnu99" "-static" "-Os" "-g0" "-Wall"
                     "run.c" "-o" result
                     (string-append "-DWRAPPER_PROGRAM=\""
                                    (canonicalize-path (dirname result)) "/"
                                    (basename result) "\"")
                     (append (if proot
                                 (list (string-append "-DPROOT_PROGRAM=\""
                                                      proot "\""))
                                 '())
                             (elf-loader-compile-flags program)))
              (delete-file "run.c")))

          (setvbuf (current-output-port) 'line)

          ;; Link the top-level files of PACKAGE so that search paths are
          ;; properly defined in PROFILE/etc/profile.
          (mkdir target)
          (for-each (lambda (file)
                      (unless (member file '("." ".." "bin" "sbin" "libexec"))
                        (symlink-relative (string-append input  "/" file)
                                          (string-append target "/" file))))
                    (scandir input))

          (receive (executables others)
              (partition executable-file?
			 ;; Note: Trailing slash in case these are symlinks.
                         (append (find-files (string-append input "/bin/"))
                                 (find-files (string-append input "/sbin/"))
                                 (find-files (string-append input "/libexec/"))))
            ;; Wrap only executables, since the wrapper will eventually need
            ;; to execve them.  E.g. git's "libexec" directory contains many
            ;; shell scripts that are source'd from elsewhere, which fails if
            ;; they are wrapped.
            (for-each build-wrapper executables)
            ;; Link any other non-executable files
            (for-each (lambda (old)
                        (let ((new (string-append target (strip-store-prefix old))))
                          (mkdir-p (dirname new))
                          (symlink-relative old new)))
                      others)))))

  (computed-file (string-append
                  (cond ((package? package)
                         (package-full-name package "-"))
                        ((inferior-package? package)
                         (string-append (inferior-package-name package)
                                        "-"
                                        (inferior-package-version package)))
                        (else "wrapper"))
                  "R")
                 build))

(define (wrapped-manifest-entry entry . args)
  (manifest-entry
    (inherit entry)
    (item (apply wrapped-package
                 (manifest-entry-item entry)
                 (manifest-entry-output entry)
                 args))
    (dependencies (map (lambda (entry)
                         (apply wrapped-manifest-entry entry args))
                       (manifest-entry-dependencies entry)))))

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

(define %default-options
  ;; Alist of default option values.
  `((format . tarball)
    (profile-name . "guix-profile")
    (system . ,(%current-system))
    (substitutes? . #t)
    (offload? . #t)
    (graft? . #t)
    (print-build-trace? . #t)
    (print-extended-build-trace? . #t)
    (multiplexed-build-output? . #t)
    (debug . 0)
    (verbosity . 1)
    (symlinks . ())
    (compressor . ,(first %compressors))))

(define %formats
  ;; Supported pack formats.
  `((tarball . ,self-contained-tarball)
    (squashfs . ,squashfs-image)
    (docker  . ,docker-image)))

(define (show-formats)
  ;; Print the supported pack formats.
  (display (G_ "The supported formats for 'guix pack' are:"))
  (newline)
  (display (G_ "
  tarball       Self-contained tarball, ready to run on another machine"))
  (display (G_ "
  squashfs      Squashfs image suitable for Singularity"))
  (display (G_ "
  docker        Tarball ready for 'docker load'"))
  (newline))

(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 pack")))

         (option '(#\n "dry-run") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'dry-run? #t result)))
         (option '(#\d "derivation") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'derivation-only? #t result)))

         (option '(#\f "format") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'format (string->symbol arg) result)))
         (option '("list-formats") #f #f
                 (lambda args
                   (show-formats)
                   (exit 0)))
         (option '(#\R "relocatable") #f #f
                 (lambda (opt name arg result)
                   (match (assq-ref result 'relocatable?)
                     (#f
                      (alist-cons 'relocatable? #t result))
                     (_
                      (alist-cons 'relocatable? 'proot
                                  (alist-delete 'relocatable? result))))))
         (option '(#\e "expression") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'expression arg result)))
         (option '(#\m "manifest") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'manifest arg result)))
         (option '(#\s "system") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'system arg
                               (alist-delete 'system result eq?))))
         (option '("entry-point") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'entry-point arg result)))
         (option '("target") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'target arg
                               (alist-delete 'target result eq?))))
         (option '(#\C "compression") #t #f
                 (lambda (opt name arg result)
                   (alist-cons 'compressor (lookup-compressor arg)
                               result)))
         (option '(#\S "symlink") #t #f
                 (lambda (opt name arg result)
                   ;; Note: Using 'string-split' allows us to handle empty
                   ;; TARGET (as in "/opt/guile=", meaning that /opt/guile is
                   ;; a symlink to the profile) correctly.
                   (match (string-split arg (char-set #\=))
                     ((source target)
                      (let ((symlinks (assoc-ref result 'symlinks)))
                        (alist-cons 'symlinks
                                    `((,source -> ,target) ,@symlinks)
                                    (alist-delete 'symlinks result eq?))))
                     (x
                      (leave (G_ "~a: invalid symlink specification~%")
                             arg)))))
         (option '("save-provenance") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'save-provenance? #t result)))
         (option '("localstatedir") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'localstatedir? #t result)))
         (option '("profile-name") #t #f
                 (lambda (opt name arg result)
                   (match arg
                     ((or "guix-profile" "current-guix")
                      (alist-cons 'profile-name arg result))
                     (_
                      (leave (G_ "~a: unsupported profile name~%") arg)))))
         (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 '("bootstrap") #f #f
                 (lambda (opt name arg result)
                   (alist-cons 'bootstrap? #t result)))

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

(define (show-help)
  (display (G_ "Usage: guix pack [OPTION]... PACKAGE...
Create a bundle of PACKAGE.\n"))
  (show-build-options-help)
  (newline)
  (show-transformation-options-help)
  (newline)
  (display (G_ "
  -f, --format=FORMAT    build a pack in the given FORMAT"))
  (display (G_ "
      --list-formats     list the formats available"))
  (display (G_ "
  -R, --relocatable      produce relocatable executables"))
  (display (G_ "
  -e, --expression=EXPR  consider the package EXPR evaluates to"))
  (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_ "
  -C, --compression=TOOL compress using TOOL--e.g., \"lzip\""))
  (display (G_ "
  -S, --symlink=SPEC     create symlinks to the profile according to SPEC"))
  (display (G_ "
  -m, --manifest=FILE    create a pack with the manifest from FILE"))
  (display (G_ "
      --entry-point=PROGRAM
                         use PROGRAM as the entry point of the pack"))
  (display (G_ "
      --save-provenance  save provenance information"))
  (display (G_ "
      --localstatedir    include /var/guix in the resulting pack"))
  (display (G_ "
      --profile-name=NAME
                         populate /var/guix/profiles/.../NAME"))
  (display (G_ "
  -r, --root=FILE        make FILE a symlink to the result, and register it
                         as a garbage collector root"))
  (display (G_ "
  -d, --derivation       return the derivation of the pack"))
  (display (G_ "
  -v, --verbosity=LEVEL  use the given verbosity LEVEL"))
  (display (G_ "
      --bootstrap        use the bootstrap binaries to build the pack"))
  (newline)
  (display (G_ "
  -h, --help             display this help and exit"))
  (display (G_ "
  -V, --version          display version information and exit"))
  (newline)
  (show-bug-report-information))

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

(define-command (guix-pack . args)
  (category development)
  (synopsis "create application bundles")

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

  (define maybe-package-argument
    ;; Given an option pair, return a package, a package/output tuple, or #f.
    (match-lambda
      (('argument . spec)
       (call-with-values
           (lambda ()
             (specification->package+output spec))
         list))
      (('expression . exp)
       (read/eval-package-expression exp))
      (x #f)))

  (define (manifest-from-args store opts)
    (let* ((transform     (options->transformation opts))
           (packages      (map (match-lambda
                                 (((? package? package) output)
                                  (list (transform package) output))
                                 ((? package? package)
                                  (list (transform package) "out")))
                               (reverse
                                (filter-map maybe-package-argument opts))))
           (manifests     (filter-map (match-lambda
                                        (('manifest . file) file)
                                        (_ #f))
                                      opts)))
      (define with-provenance
        (if (assoc-ref opts 'save-provenance?)
            (lambda (manifest)
              (map-manifest-entries
               (lambda (entry)
                 (let ((entry (manifest-entry-with-provenance entry)))
                   (unless (assq 'provenance (manifest-entry-properties entry))
                     (warning (G_ "could not determine provenance of package ~a~%")
                              (manifest-entry-name entry)))
                   entry))
               manifest))
            identity))

      (define (with-transformations manifest)
        (map-manifest-entries manifest-entry-with-transformations
                              manifest))

      (with-provenance
       (with-transformations
        (cond
         ((and (not (null? manifests)) (not (null? packages)))
          (leave (G_ "both a manifest and a package list were given~%")))
         ((not (null? manifests))
          (concatenate-manifests
           (map (lambda (file)
                  (let ((user-module (make-user-module
                                      '((guix profiles) (gnu)))))
                    (load* file user-module)))
                manifests)))
         (else
          (packages->manifest packages)))))))

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

        (with-build-handler (build-notifier #:dry-run?
                                            (assoc-ref opts 'dry-run?)
                                            #:verbosity
                                            (assoc-ref opts 'verbosity)
                                            #:use-substitutes?
                                            (assoc-ref opts 'substitutes?))
          (parameterize ((%graft? (assoc-ref opts 'graft?))
                         (%guile-for-build (package-derivation
                                            store
                                            (if (assoc-ref opts 'bootstrap?)
                                                %bootstrap-guile
                                                (default-guile))
                                            (assoc-ref opts 'system)
                                            #:graft? (assoc-ref opts 'graft?))))
            (let* ((derivation? (assoc-ref opts 'derivation-only?))
                   (relocatable? (assoc-ref opts 'relocatable?))
                   (proot?      (eq? relocatable? 'proot))
                   (manifest    (let ((manifest (manifest-from-args store opts)))
                                  ;; Note: We cannot honor '--bootstrap' here because
                                  ;; 'glibc-bootstrap' lacks 'libc.a'.
                                  (if relocatable?
                                      (map-manifest-entries
                                       (cut wrapped-manifest-entry <> #:proot? proot?)
                                       manifest)
                                      manifest)))
                   (pack-format (assoc-ref opts 'format))
                   (name        (string-append (symbol->string pack-format)
                                               "-pack"))
                   (target      (assoc-ref opts 'target))
                   (bootstrap?  (assoc-ref opts 'bootstrap?))
                   (compressor  (if bootstrap?
                                    bootstrap-xz
                                    (assoc-ref opts 'compressor)))
                   (archiver    (if (equal? pack-format 'squashfs)
                                    squashfs-tools
                                    (if bootstrap?
                                        %bootstrap-coreutils&co
                                        tar)))
                   (symlinks    (assoc-ref opts 'symlinks))
                   (build-image (match (assq-ref %formats pack-format)
                                  ((? procedure? proc) proc)
                                  (#f
                                   (leave (G_ "~a: unknown pack format~%")
                                          pack-format))))
                   (localstatedir? (assoc-ref opts 'localstatedir?))
                   (entry-point    (assoc-ref opts 'entry-point))
                   (profile-name   (assoc-ref opts 'profile-name))
                   (gc-root        (assoc-ref opts 'gc-root))
                   (profile        (profile
                                    (content manifest)

                                    ;; Always produce relative symlinks for
                                    ;; Singularity (see
                                    ;; <https://bugs.gnu.org/34913>).
                                    (relative-symlinks?
                                     (or relocatable?
                                         (eq? 'squashfs pack-format)))

                                    (hooks (if bootstrap?
                                               '()
                                               %default-profile-hooks))
                                    (locales? (not bootstrap?)))))
              (define (lookup-package package)
                (manifest-lookup manifest (manifest-pattern (name package))))

              (when (null? (manifest-entries manifest))
                (warning (G_ "no packages specified; building an empty pack~%")))

              (when (and (eq? pack-format 'squashfs)
                         (not (any lookup-package '("bash" "bash-minimal"))))
                (warning (G_ "Singularity requires you to provide a shell~%"))
                (display-hint (G_ "Add @code{bash} or @code{bash-minimal} \
to your package list.")))

              (run-with-store store
                (mlet* %store-monad ((drv (build-image name profile
                                                       #:target
                                                       target
                                                       #:compressor
                                                       compressor
                                                       #:symlinks
                                                       symlinks
                                                       #:localstatedir?
                                                       localstatedir?
                                                       #:entry-point
                                                       entry-point
                                                       #:profile-name
                                                       profile-name
                                                       #:archiver
                                                       archiver)))
                  (mbegin %store-monad
                    (mwhen derivation?
                      (return (format #t "~a~%"
                                      (derivation-file-name drv))))
                    (munless derivation?
                      (built-derivations (list drv))
                      (mwhen gc-root
                        (register-root* (match (derivation->output-paths drv)
                                          (((names . items) ...)
                                           items))
                                        gc-root))
                      (return (format #t "~a~%"
                                      (derivation->output-path drv))))))
                #:target target
                #:system (assoc-ref opts 'system)))))))))