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
|
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2018 David Thompson <davet@gnu.org>
;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Mike Gerwitz <mtg@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix scripts environment)
#:use-module (guix ui)
#:use-module (guix store)
#:use-module ((guix status) #:select (with-status-verbosity))
#:use-module (guix grafts)
#:use-module (guix derivations)
#:use-module (guix packages)
#:use-module (guix profiles)
#:use-module (guix search-paths)
#:use-module (guix build utils)
#:use-module (guix monads)
#:use-module ((guix gexp) #:select (lower-object))
#:use-module (guix scripts)
#:use-module (guix scripts build)
#:use-module (guix transformations)
#:use-module (gnu build linux-container)
#:use-module (gnu build accounts)
#:use-module ((guix build syscalls) #:select (set-network-interface-up))
#:use-module (gnu system linux-container)
#:use-module (gnu system file-systems)
#:use-module (gnu packages)
#:use-module (gnu packages bash)
#:use-module ((gnu packages bootstrap)
#:select (bootstrap-executable %bootstrap-guile))
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (ice-9 rdelim)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-37)
#:use-module (srfi srfi-98)
#:export (assert-container-features
guix-environment))
;; Protect some env vars from purification. Borrowed from nix-shell.
(define %precious-variables
'("HOME" "USER" "LOGNAME" "DISPLAY" "TERM" "TZ" "PAGER"))
(define %default-shell
(or (getenv "SHELL") "/bin/sh"))
(define (purify-environment white-list)
"Unset all environment variables except those that match the regexps in
WHITE-LIST and those listed in %PRECIOUS-VARIABLES. A small number of
variables such as 'HOME' and 'USER' are left untouched."
(for-each unsetenv
(remove (lambda (variable)
(or (member variable %precious-variables)
(find (cut regexp-exec <> variable)
white-list)))
(match (get-environment-variables)
(((names . _) ...)
names)))))
(define* (create-environment profile manifest
#:key pure? (white-list '()))
"Set the environment variables specified by MANIFEST for PROFILE. When
PURE? is #t, unset the variables in the current environment except those that
match the regexps in WHITE-LIST. Otherwise, augment existing environment
variables with additional search paths."
(when pure?
(purify-environment white-list))
(for-each (match-lambda
((($ <search-path-specification> variable _ separator) . value)
(let ((current (getenv variable)))
(setenv variable
(if (and current (not pure?))
(if separator
(string-append value separator current)
value)
value)))))
(profile-search-paths profile manifest))
;; Give users a way to know that they're in 'guix environment', so they can
;; adjust 'PS1' accordingly, for instance. Set it to PROFILE so users can
;; conveniently access its contents.
(setenv "GUIX_ENVIRONMENT" profile))
(define* (show-search-paths profile manifest #:key pure?)
"Display the search paths of MANIFEST applied to PROFILE. When PURE? is #t,
do not augment existing environment variables with additional search paths."
(for-each (match-lambda
((search-path . value)
(display
(search-path-definition search-path value
#:kind (if pure? 'exact 'prefix)))
(newline)))
(profile-search-paths profile manifest)))
(define (input->manifest-entry input)
"Return a manifest entry for INPUT, or #f if INPUT does not correspond to a
package."
(match input
((_ (? package? package))
(package->manifest-entry package))
((_ (? package? package) output)
(package->manifest-entry package output))
(_
#f)))
(define (package-environment-inputs package)
"Return a list of manifest entries corresponding to the transitive input
packages for PACKAGE."
;; Remove non-package inputs such as origin records.
(filter-map input->manifest-entry
(bag-transitive-inputs (package->bag package))))
(define (show-help)
(display (G_ "Usage: guix environment [OPTION]... PACKAGE... [-- COMMAND...]
Build an environment that includes the dependencies of PACKAGE and execute
COMMAND or an interactive shell in that environment.\n"))
(display (G_ "
-e, --expression=EXPR create environment for the package that EXPR
evaluates to"))
(display (G_ "
-l, --load=FILE create environment for the package that the code within
FILE evaluates to"))
(display (G_ "
-m, --manifest=FILE create environment with the manifest from FILE"))
(display (G_ "
--ad-hoc include all specified packages in the environment instead
of only their inputs"))
(display (G_ "
--pure unset existing environment variables"))
(display (G_ "
-E, --preserve=REGEXP preserve environment variables that match REGEXP"))
(display (G_ "
--search-paths display needed environment variable definitions"))
(display (G_ "
-s, --system=SYSTEM attempt to build for SYSTEM--e.g., \"i686-linux\""))
(display (G_ "
-r, --root=FILE make FILE a symlink to the result, and register it
as a garbage collector root"))
(display (G_ "
-C, --container run command within an isolated container"))
(display (G_ "
-N, --network allow containers to access the network"))
(display (G_ "
-P, --link-profile link environment profile to ~/.guix-profile within
an isolated container"))
(display (G_ "
-u, --user=USER instead of copying the name and home of the current
user into an isolated container, use the name USER
with home directory /home/USER"))
(display (G_ "
--no-cwd do not share current working directory with an
isolated container"))
(display (G_ "
--share=SPEC for containers, share writable host file system
according to SPEC"))
(display (G_ "
--expose=SPEC for containers, expose read-only host file system
according to SPEC"))
(display (G_ "
-v, --verbosity=LEVEL use the given verbosity LEVEL"))
(display (G_ "
--bootstrap use bootstrap binaries to build the environment"))
(newline)
(show-build-options-help)
(newline)
(display (G_ "
-h, --help display this help and exit"))
(display (G_ "
-V, --version display version information and exit"))
(newline)
(show-bug-report-information))
(define %default-options
`((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)))
(define (tag-package-arg opts arg)
"Return a two-element list with the form (TAG ARG) that tags ARG with either
'ad-hoc' in OPTS has the 'ad-hoc?' key set to #t, or 'inputs' otherwise."
;; Normally, the transitive inputs to a package are added to an environment,
;; but the ad-hoc? flag changes the meaning of a package argument such that
;; the package itself is added to the environment instead.
(if (assoc-ref opts 'ad-hoc?)
`(ad-hoc-package ,arg)
`(package ,arg)))
(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 environment")))
(option '("pure") #f #f
(lambda (opt name arg result)
(alist-cons 'pure #t result)))
(option '(#\E "preserve") #t #f
(lambda (opt name arg result)
(alist-cons 'inherit-regexp
(make-regexp* arg)
result)))
(option '("inherit") #t #f ;deprecated
(lambda (opt name arg result)
(warning (G_ "'--inherit' is deprecated, \
use '--preserve' instead~%"))
(alist-cons 'inherit-regexp
(make-regexp* arg)
result)))
(option '("search-paths") #f #f
(lambda (opt name arg result)
(alist-cons 'search-paths #t result)))
(option '(#\l "load") #t #f
(lambda (opt name arg result)
(alist-cons 'load
(tag-package-arg result arg)
result)))
(option '(#\e "expression") #t #f
(lambda (opt name arg result)
(alist-cons 'expression
(tag-package-arg result arg)
result)))
(option '(#\m "manifest") #t #f
(lambda (opt name arg result)
(alist-cons 'manifest
arg
result)))
(option '("ad-hoc") #f #f
(lambda (opt name arg result)
(alist-cons 'ad-hoc? #t result)))
(option '(#\n "dry-run") #f #f
(lambda (opt name arg result)
(alist-cons 'dry-run? #t result)))
(option '(#\s "system") #t #f
(lambda (opt name arg result)
(alist-cons 'system arg
(alist-delete 'system result eq?))))
(option '(#\C "container") #f #f
(lambda (opt name arg result)
(alist-cons 'container? #t result)))
(option '(#\N "network") #f #f
(lambda (opt name arg result)
(alist-cons 'network? #t result)))
(option '(#\P "link-profile") #f #f
(lambda (opt name arg result)
(alist-cons 'link-profile? #t result)))
(option '(#\u "user") #t #f
(lambda (opt name arg result)
(alist-cons 'user arg
(alist-delete 'user result eq?))))
(option '("no-cwd") #f #f
(lambda (opt name arg result)
(alist-cons 'no-cwd? #t result)))
(option '("share") #t #f
(lambda (opt name arg result)
(alist-cons 'file-system-mapping
(specification->file-system-mapping arg #t)
result)))
(option '("expose") #t #f
(lambda (opt name arg result)
(alist-cons 'file-system-mapping
(specification->file-system-mapping arg #f)
result)))
(option '(#\r "root") #t #f
(lambda (opt name arg result)
(alist-cons 'gc-root arg result)))
(option '(#\v "verbosity") #t #f
(lambda (opt name arg result)
(let ((level (string->number* arg)))
(alist-cons 'verbosity level
(alist-delete 'verbosity result)))))
(option '("bootstrap") #f #f
(lambda (opt name arg result)
(alist-cons 'bootstrap? #t result)))
(append %transformation-options
%standard-build-options)))
(define (pick-all alist key)
"Return a list of values in ALIST associated with KEY."
(define same-key? (cut eq? key <>))
(fold (lambda (pair memo)
(match pair
(((? same-key? k) . v)
(cons v memo))
(_ memo)))
'() alist))
(define (options/resolve-packages store opts)
"Return OPTS with package specification strings replaced by manifest entries
for the corresponding packages."
(define (manifest-entry=? e1 e2)
(and (eq? (manifest-entry-item e1) (manifest-entry-item e2))
(string=? (manifest-entry-output e1)
(manifest-entry-output e2))))
(define transform
(options->transformation opts))
(define* (package->manifest-entry* package #:optional (output "out"))
(package->manifest-entry (transform package) output))
(define (packages->outputs packages mode)
(match packages
((? package? package)
(if (eq? mode 'ad-hoc-package)
(list (package->manifest-entry* package))
(package-environment-inputs package)))
(((? package? package) (? string? output))
(if (eq? mode 'ad-hoc-package)
(list (package->manifest-entry* package output))
(package-environment-inputs package)))
((lst ...)
(append-map (cut packages->outputs <> mode) lst))))
(manifest
(delete-duplicates
(append-map (match-lambda
(('package 'ad-hoc-package (? string? spec))
(let-values (((package output)
(specification->package+output spec)))
(list (package->manifest-entry* package output))))
(('package 'package (? string? spec))
(package-environment-inputs
(transform (specification->package+output spec))))
(('expression mode str)
;; Add all the outputs of the package STR evaluates to.
(packages->outputs (read/eval str) mode))
(('load mode file)
;; Add all the outputs of the package defined in FILE.
(let ((module (make-user-module '())))
(packages->outputs (load* file module) mode)))
(('manifest . file)
(let ((module (make-user-module '((guix profiles) (gnu)))))
(manifest-entries (load* file module))))
(_ '()))
opts)
manifest-entry=?)))
(define (manifest->derivation manifest system bootstrap?)
"Return the derivation for a profile of MANIFEST.
BOOTSTRAP? specifies whether to use the bootstrap Guile to build the profile."
(profile-derivation manifest
#:system system
;; Packages can have conflicting inputs, or explicit
;; inputs that conflict with implicit inputs (e.g., gcc,
;; gzip, etc.). Thus, do not error out when we
;; encounter collision.
#:allow-collisions? #t
#:hooks (if bootstrap?
'()
%default-profile-hooks)
#:locales? (not bootstrap?)))
(define requisites* (store-lift requisites))
(define (inputs->requisites inputs)
"Convert INPUTS, a list of input tuples or store path strings, into a set of
requisite store items i.e. the union closure of all the inputs."
(define (input->requisites input)
(requisites*
(match input
((drv output)
(list (derivation->output-path drv output)))
((drv)
(list (derivation->output-path drv)))
((? direct-store-path? path)
(list path)))))
(mlet %store-monad ((reqs (mapm %store-monad
input->requisites inputs)))
(return (delete-duplicates (concatenate reqs)))))
(define (status->exit-code status)
"Compute the exit code made from STATUS, a value as returned by 'waitpid',
and suitable for 'exit'."
;; See <bits/waitstatus.h>.
(or (status:exit-val status)
(logior #x80 (status:term-sig status))))
(define exit/status (compose exit status->exit-code))
(define primitive-exit/status (compose primitive-exit status->exit-code))
(define* (launch-environment command profile manifest
#:key pure? (white-list '()))
"Run COMMAND in a new environment containing INPUTS, using the native search
paths defined by the list PATHS. When PURE?, pre-existing environment
variables are cleared before setting the new ones, except those matching the
regexps in WHITE-LIST."
;; Properly handle SIGINT, so pressing C-c in an interactive terminal
;; application works.
(sigaction SIGINT SIG_DFL)
(create-environment profile manifest
#:pure? pure? #:white-list white-list)
(match command
((program . args)
(apply execlp program program args))))
(define* (launch-environment/fork command profile manifest
#:key pure? (white-list '()))
"Run COMMAND in a new process with an environment containing PROFILE, with
the search paths specified by MANIFEST. When PURE?, pre-existing environment
variables are cleared before setting the new ones, except those matching the
regexps in WHITE-LIST."
(match (primitive-fork)
(0 (launch-environment command profile manifest
#:pure? pure?
#:white-list white-list))
(pid (match (waitpid pid)
((_ . status) status)))))
(define* (launch-environment/container #:key command bash user user-mappings
profile manifest link-profile? network?
map-cwd? (white-list '()))
"Run COMMAND within a container that features the software in PROFILE.
Environment variables are set according to the search paths of MANIFEST.
The global shell is BASH, a file name for a GNU Bash binary in the
store. When NETWORK?, access to the host system network is permitted.
USER-MAPPINGS, a list of file system mappings, contains the user-specified
host file systems to mount inside the container. If USER is not #f, each
target of USER-MAPPINGS will be re-written relative to '/home/USER', and USER
will be used for the passwd entry. LINK-PROFILE? creates a symbolic link from
~/.guix-profile to the environment profile.
Preserve environment variables whose name matches the one of the regexps in
WHILE-LIST."
(define (optional-mapping->fs mapping)
(and (file-exists? (file-system-mapping-source mapping))
(file-system-mapping->bind-mount mapping)))
(mlet %store-monad ((reqs (inputs->requisites
(list (direct-store-path bash) profile))))
(return
(let* ((cwd (getcwd))
(home (getenv "HOME"))
(uid (if user 1000 (getuid)))
(gid (if user 1000 (getgid)))
(passwd (let ((pwd (getpwuid (getuid))))
(password-entry
(name (or user (passwd:name pwd)))
(real-name (if user
""
(passwd:gecos pwd)))
(uid uid) (gid gid) (shell bash)
(directory (if user
(string-append "/home/" user)
(passwd:dir pwd))))))
(groups (list (group-entry (name "users") (gid gid))
(group-entry (gid 65534) ;the overflow GID
(name "overflow"))))
(home-dir (password-entry-directory passwd))
(logname (password-entry-name passwd))
(environ (filter (match-lambda
((variable . value)
(find (cut regexp-exec <> variable)
white-list)))
(get-environment-variables)))
;; Bind-mount all requisite store items, user-specified mappings,
;; /bin/sh, the current working directory, and possibly networking
;; configuration files within the container.
(mappings
(append
(override-user-mappings
user home
(append user-mappings
;; Share current working directory, unless asked not to.
(if map-cwd?
(list (file-system-mapping
(source cwd)
(target cwd)
(writable? #t)))
'())))
;; Mappings for the union closure of all inputs.
(map (lambda (dir)
(file-system-mapping
(source dir)
(target dir)
(writable? #f)))
reqs)))
(file-systems (append %container-file-systems
(if network?
(filter-map optional-mapping->fs
%network-file-mappings)
'())
(map file-system-mapping->bind-mount
mappings))))
(exit/status
(call-with-container file-systems
(lambda ()
;; Setup global shell.
(mkdir-p "/bin")
(symlink bash "/bin/sh")
;; Set a reasonable default PS1.
(setenv "PS1" "\\u@\\h \\w [env]\\$ ")
;; Setup directory for temporary files.
(mkdir-p "/tmp")
(for-each (lambda (var)
(setenv var "/tmp"))
;; The same variables as in Nix's 'build.cc'.
'("TMPDIR" "TEMPDIR" "TMP" "TEMP"))
;; Some programs expect USER and/or LOGNAME to be set.
(setenv "LOGNAME" logname)
(setenv "USER" logname)
;; Create a dummy home directory.
(mkdir-p home-dir)
(setenv "HOME" home-dir)
;; If requested, link $GUIX_ENVIRONMENT to $HOME/.guix-profile;
;; this allows programs expecting that path to continue working as
;; expected within a container.
(when link-profile? (link-environment profile home-dir))
;; Create a dummy /etc/passwd to satisfy applications that demand
;; to read it, such as 'git clone' over SSH, a valid use-case when
;; sharing the host's network namespace.
(mkdir-p "/etc")
(write-passwd (list passwd))
(write-group groups)
(unless network?
;; When isolated from the network, provide a minimal /etc/hosts
;; to resolve "localhost".
(call-with-output-file "/etc/hosts"
(lambda (port)
(display "127.0.0.1 localhost\n" port)))
;; Allow local AF_INET communications.
(set-network-interface-up "lo"))
;; For convenience, start in the user's current working
;; directory or, if unmapped, the home directory.
(chdir (if map-cwd?
(override-user-dir user home cwd)
home-dir))
;; Set environment variables that match WHITE-LIST.
(for-each (match-lambda
((variable . value)
(setenv variable value)))
environ)
(primitive-exit/status
;; A container's environment is already purified, so no need to
;; request it be purified again.
(launch-environment command
(if link-profile?
(string-append home-dir "/.guix-profile")
profile)
manifest #:pure? #f)))
#:guest-uid uid
#:guest-gid gid
#:namespaces (if network?
(delq 'net %namespaces) ; share host network
%namespaces)))))))
(define (user-override-home user)
"Return home directory for override user USER."
(string-append "/home/" user))
(define (override-user-mappings user home mappings)
"If a username USER is provided, rewrite each HOME prefix in file system
mappings MAPPINGS to a home directory determined by 'override-user-dir';
otherwise, return MAPPINGS."
(if (not user)
mappings
(map (lambda (mapping)
(let ((target (file-system-mapping-target mapping)))
(if (string-prefix? home target)
(file-system-mapping
(source (file-system-mapping-source mapping))
(target (override-user-dir user home target))
(writable? (file-system-mapping-writable? mapping)))
mapping)))
mappings)))
(define (override-user-dir user home dir)
"If username USER is provided, overwrite string prefix HOME in DIR with a
directory determined by 'user-override-home'; otherwise, return DIR."
(if (and user (string-prefix? home dir))
(string-append (user-override-home user)
(substring dir (string-length home)))
dir))
(define (link-environment profile home-dir)
"Create a symbolic link from HOME-DIR/.guix-profile to PROFILE."
(let ((profile-dir (string-append home-dir "/.guix-profile")))
(catch 'system-error
(lambda ()
(symlink profile profile-dir))
(lambda args
(if (= EEXIST (system-error-errno args))
(leave (G_ "cannot link profile: '~a' already exists within container~%")
profile-dir)
(apply throw args))))))
(define (environment-bash container? bootstrap? system)
"Return a monadic value in the store monad for the version of GNU Bash
needed in the environment for SYSTEM, if any. If CONTAINER? is #f, return #f.
If CONTAINER? and BOOTSTRAP?, return the store path for the bootstrap Bash.
Otherwise, return the derivation for the Bash package."
(with-monad %store-monad
(cond
((and container? (not bootstrap?))
(package->derivation bash))
;; Use the bootstrap Bash instead.
((and container? bootstrap?)
(lower-object (bootstrap-executable "bash" system)))
(else
(return #f)))))
(define (parse-args args)
"Parse the list of command line arguments ARGS."
(define (handle-argument arg result)
(alist-cons 'package (tag-package-arg result arg) result))
;; The '--' token is used to separate the command to run from the rest of
;; the operands.
(let-values (((args command) (break (cut string=? "--" <>) args)))
(let ((opts (parse-command-line args %options (list %default-options)
#:argument-handler handle-argument)))
(match command
(() opts)
(("--") opts)
(("--" command ...) (alist-cons 'exec command opts))))))
(define (assert-container-features)
"Check if containers can be created and exit with an informative error
message if any test fails."
(unless (user-namespace-supported?)
(report-error (G_ "cannot create container: user namespaces unavailable\n"))
(leave (G_ "is your kernel version < 3.10?\n")))
(unless (unprivileged-user-namespace-supported?)
(report-error (G_ "cannot create container: unprivileged user cannot create user namespaces\n"))
(leave (G_ "please set /proc/sys/kernel/unprivileged_userns_clone to \"1\"\n")))
(unless (setgroups-supported?)
(report-error (G_ "cannot create container: /proc/self/setgroups does not exist\n"))
(leave (G_ "is your kernel version < 3.19?\n"))))
(define (register-gc-root target root)
"Make ROOT an indirect root to TARGET. This is procedure is idempotent."
(let* ((root (if (string-prefix? "/" root)
root
(string-append (canonicalize-path (dirname root))
"/" root))))
(catch 'system-error
(lambda ()
(symlink target root)
((store-lift add-indirect-root) root))
(lambda args
(if (and (= EEXIST (system-error-errno args))
(equal? (false-if-exception (readlink root)) target))
(with-monad %store-monad
(return #t))
(apply throw args))))))
;;;
;;; Entry point.
;;;
(define-command (guix-environment . args)
(category development)
(synopsis "spawn one-off software environments")
(with-error-handling
(let* ((opts (parse-args args))
(pure? (assoc-ref opts 'pure))
(container? (assoc-ref opts 'container?))
(link-prof? (assoc-ref opts 'link-profile?))
(network? (assoc-ref opts 'network?))
(no-cwd? (assoc-ref opts 'no-cwd?))
(user (assoc-ref opts 'user))
(bootstrap? (assoc-ref opts 'bootstrap?))
(system (assoc-ref opts 'system))
(command (or (assoc-ref opts 'exec)
;; Spawn a shell if the user didn't specify
;; anything in particular.
(if container?
;; The user's shell is likely not available
;; within the container.
'("/bin/sh")
(list %default-shell))))
(mappings (pick-all opts 'file-system-mapping))
(white-list (pick-all opts 'inherit-regexp)))
(when container? (assert-container-features))
(when (and (not container?) link-prof?)
(leave (G_ "'--link-profile' cannot be used without '--container'~%")))
(when (and (not container?) user)
(leave (G_ "'--user' cannot be used without '--container'~%")))
(when (and (not container?) no-cwd?)
(leave (G_ "--no-cwd cannot be used without --container~%")))
(with-store store
(with-build-handler (build-notifier #:use-substitutes?
(assoc-ref opts 'substitutes?)
#:verbosity
(assoc-ref opts 'verbosity)
#:dry-run?
(assoc-ref opts 'dry-run?))
(with-status-verbosity (assoc-ref opts 'verbosity)
(define manifest
(options/resolve-packages store opts))
(set-build-options-from-command-line store opts)
;; Use the bootstrap Guile when requested.
(parameterize ((%graft? (assoc-ref opts 'graft?))
(%guile-for-build
(package-derivation
store
(if bootstrap?
%bootstrap-guile
(default-guile)))))
(run-with-store store
;; Containers need a Bourne shell at /bin/sh.
(mlet* %store-monad ((bash (environment-bash container?
bootstrap?
system))
(prof-drv (manifest->derivation
manifest system bootstrap?))
(profile -> (derivation->output-path prof-drv))
(gc-root -> (assoc-ref opts 'gc-root)))
;; First build the inputs. This is necessary even for
;; --search-paths. Additionally, we might need to build bash for
;; a container.
(mbegin %store-monad
(built-derivations (if (derivation? bash)
(list prof-drv bash)
(list prof-drv)))
(mwhen gc-root
(register-gc-root profile gc-root))
(cond
((assoc-ref opts 'search-paths)
(show-search-paths profile manifest #:pure? pure?)
(return #t))
(container?
(let ((bash-binary
(if bootstrap?
(derivation->output-path bash)
(string-append (derivation->output-path bash)
"/bin/sh"))))
(launch-environment/container #:command command
#:bash bash-binary
#:user user
#:user-mappings mappings
#:profile profile
#:manifest manifest
#:white-list white-list
#:link-profile? link-prof?
#:network? network?
#:map-cwd? (not no-cwd?))))
(else
(return
(exit/status
(launch-environment/fork command profile manifest
#:white-list white-list
#:pure? pure?)))))))))))))))
|