summary refs log tree commit diff
path: root/gnu/system.scm
blob: f782d8eacb9b9e97af6029a88af3555c643f80d9 (plain) (blame)
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
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015, 2016 Alex Kost <alezost@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu system)
  #:use-module (guix store)
  #:use-module (guix monads)
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (guix packages)
  #:use-module (guix derivations)
  #:use-module (guix profiles)
  #:use-module (guix ui)
  #:use-module (gnu packages base)
  #:use-module (gnu packages bash)
  #:use-module (gnu packages guile)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages pciutils)
  #:use-module (gnu packages package-management)
  #:use-module (gnu packages less)
  #:use-module (gnu packages zile)
  #:use-module (gnu packages nano)
  #:use-module (gnu packages lsof)
  #:use-module (gnu packages gawk)
  #:use-module (gnu packages man)
  #:use-module (gnu packages texinfo)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages firmware)
  #:autoload   (gnu packages cryptsetup) (cryptsetup)
  #:use-module (gnu services)
  #:use-module (gnu services shepherd)
  #:use-module (gnu services base)
  #:use-module (gnu system grub)
  #:use-module (gnu system shadow)
  #:use-module (gnu system nss)
  #:use-module (gnu system locale)
  #:use-module (gnu system pam)
  #:use-module (gnu system linux-initrd)
  #:use-module (gnu system file-systems)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:export (operating-system
            operating-system?

            operating-system-bootloader
            operating-system-services
            operating-system-user-services
            operating-system-packages
            operating-system-host-name
            operating-system-hosts-file
            operating-system-kernel
            operating-system-kernel-arguments
            operating-system-initrd
            operating-system-users
            operating-system-groups
            operating-system-issue
            operating-system-timezone
            operating-system-locale
            operating-system-locale-definitions
            operating-system-locale-libcs
            operating-system-mapped-devices
            operating-system-file-systems
            operating-system-store-file-system
            operating-system-activation-script

            operating-system-derivation
            operating-system-profile
            operating-system-grub.cfg
            operating-system-etc-directory
            operating-system-locale-directory
            operating-system-boot-script

            boot-parameters
            boot-parameters?
            boot-parameters-label
            boot-parameters-root-device
            boot-parameters-kernel
            boot-parameters-kernel-arguments
            read-boot-parameters

            local-host-aliases
            %setuid-programs
            %base-packages
            %base-firmware

            luks-device-mapping))

;;; Commentary:
;;;
;;; This module supports whole-system configuration.
;;;
;;; Code:

;; System-wide configuration.
;; TODO: Add per-field docstrings/stexi.
(define-record-type* <operating-system> operating-system
  make-operating-system
  operating-system?
  (kernel operating-system-kernel                 ; package
          (default linux-libre))
  (kernel-arguments operating-system-kernel-arguments
                    (default '()))                ; list of gexps/strings
  (bootloader operating-system-bootloader)        ; <grub-configuration>

  (initrd operating-system-initrd                 ; (list fs) -> M derivation
          (default base-initrd))
  (firmware operating-system-firmware             ; list of packages
            (default %base-firmware))

  (host-name operating-system-host-name)          ; string
  (hosts-file operating-system-hosts-file         ; file-like | #f
              (default #f))

  (mapped-devices operating-system-mapped-devices ; list of <mapped-device>
                  (default '()))
  (file-systems operating-system-file-systems)    ; list of fs
  (swap-devices operating-system-swap-devices     ; list of strings
                (default '()))

  (users operating-system-users                   ; list of user accounts
         (default %base-user-accounts))
  (groups operating-system-groups                 ; list of user groups
          (default %base-groups))

  (skeletons operating-system-skeletons           ; list of name/monadic value
             (default (default-skeletons)))
  (issue operating-system-issue                   ; string
         (default %default-issue))

  (packages operating-system-packages             ; list of (PACKAGE OUTPUT...)
            (default %base-packages))             ; or just PACKAGE

  (timezone operating-system-timezone)            ; string
  (locale   operating-system-locale               ; string
            (default "en_US.utf8"))
  (locale-definitions operating-system-locale-definitions ; list of <locale-definition>
                      (default %default-locale-definitions))
  (locale-libcs operating-system-locale-libcs     ; list of <packages>
                (default %default-locale-libcs))
  (name-service-switch operating-system-name-service-switch ; <name-service-switch>
                       (default %default-nss))

  (services operating-system-user-services        ; list of monadic services
            (default %base-services))

  (pam-services operating-system-pam-services     ; list of PAM services
                (default (base-pam-services)))
  (setuid-programs operating-system-setuid-programs
                   (default %setuid-programs))    ; list of string-valued gexps

  (sudoers-file operating-system-sudoers-file     ; file-like
                (default %sudoers-specification)))


;;;
;;; Services.
;;;

(define (open-luks-device source target)
  "Return a gexp that maps SOURCE to TARGET as a LUKS device, using
'cryptsetup'."
  #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup")
                    "open" "--type" "luks"
                    #$source #$target)))

(define (close-luks-device source target)
  "Return a gexp that closes TARGET, a LUKS device."
  #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup")
                    "close" #$target)))

(define luks-device-mapping
  ;; The type of LUKS mapped devices.
  (mapped-device-kind
   (open open-luks-device)
   (close close-luks-device)))

(define (other-file-system-services os)
  "Return file system services for the file systems of OS that are not marked
as 'needed-for-boot'."
  (define file-systems
    (remove file-system-needed-for-boot?
            (operating-system-file-systems os)))

  (define (device-mappings fs)
    (let ((device (file-system-device fs)))
      (if (string? device)                        ;title is 'device
          (filter (lambda (md)
                    (string=? (string-append "/dev/mapper/"
                                             (mapped-device-target md))
                              device))
                  (operating-system-mapped-devices os))
          '())))

  (define (add-dependencies fs)
    ;; Add the dependencies due to device mappings to FS.
    (file-system
      (inherit fs)
      (dependencies
       (delete-duplicates (append (device-mappings fs)
                                  (file-system-dependencies fs))
                          eq?))))

  (map (compose file-system-service add-dependencies) file-systems))

(define (mapped-device-user device file-systems)
  "Return a file system among FILE-SYSTEMS that uses DEVICE, or #f."
  (let ((target (string-append "/dev/mapper/" (mapped-device-target device))))
    (find (lambda (fs)
            (and (eq? 'device (file-system-title fs))
                 (string=? (file-system-device fs) target)))
          file-systems)))

(define (operating-system-user-mapped-devices os)
  "Return the subset of mapped devices that can be installed in
user-land--i.e., those not needed during boot."
  (let ((devices      (operating-system-mapped-devices os))
        (file-systems (operating-system-file-systems os)))
   (filter (lambda (md)
             (let ((user (mapped-device-user md file-systems)))
               (or (not user)
                   (not (file-system-needed-for-boot? user)))))
           devices)))

(define (operating-system-boot-mapped-devices os)
  "Return the subset of mapped devices that must be installed during boot,
from the initrd."
  (let ((devices      (operating-system-mapped-devices os))
        (file-systems (operating-system-file-systems os)))
   (filter (lambda (md)
             (let ((user (mapped-device-user md file-systems)))
               (and user (file-system-needed-for-boot? user))))
           devices)))

(define (device-mapping-services os)
  "Return the list of device-mapping services for OS as a list."
  (map (lambda (md)
         (let* ((source (mapped-device-source md))
                (target (mapped-device-target md))
                (type   (mapped-device-type md))
                (open   (mapped-device-kind-open type))
                (close  (mapped-device-kind-close type)))
           (device-mapping-service target
                                   (open source target)
                                   (close source target))))
       (operating-system-user-mapped-devices os)))

(define (swap-services os)
  "Return the list of swap services for OS."
  (map swap-service (operating-system-swap-devices os)))

(define* (operating-system-directory-base-entries os #:key container?)
  "Return the basic entries of the 'system' directory of OS for use as the
value of the SYSTEM-SERVICE-TYPE service."
  (mlet %store-monad ((locale (operating-system-locale-directory os)))
    (if container?
        (return `(("locale" ,locale)))
        (mlet %store-monad
            ((kernel  ->  (operating-system-kernel os))
             (initrd      (operating-system-initrd-file os))
             (params      (operating-system-parameters-file os)))
          (return `(("kernel" ,kernel)
                    ("parameters" ,params)
                    ("initrd" ,initrd)
                    ("locale" ,locale)))))))      ;used by libc

(define* (essential-services os #:key container?)
  "Return the list of essential services for OS.  These are special services
that implement part of what's declared in OS are responsible for low-level
bookkeeping.  CONTAINER? determines whether to return the list of services for
a container or that of a \"bare metal\" system."
  (define known-fs
    (map file-system-mount-point (operating-system-file-systems os)))

  (let* ((mappings  (device-mapping-services os))
         (root-fs   (root-file-system-service))
         (other-fs  (other-file-system-services os))
         (unmount   (user-unmount-service known-fs))
         (swaps     (swap-services os))
         (procs     (user-processes-service
                     (map service-parameters other-fs)))
         (host-name (host-name-service (operating-system-host-name os)))
         (entries   (operating-system-directory-base-entries
                     os #:container? container?)))
    (cons* (service system-service-type entries)
           %boot-service

           ;; %SHEPHERD-ROOT-SERVICE must come first so that the gexp that
           ;; execs shepherd comes last in the boot script (XXX).  Likewise,
           ;; the cleanup service must come last so that its gexp runs before
           ;; activation code.
           %shepherd-root-service
           %activation-service
           (service cleanup-service-type #f)

           (pam-root-service (operating-system-pam-services os))
           (account-service (append (operating-system-accounts os)
                                    (operating-system-groups os))
                            (operating-system-skeletons os))
           (operating-system-etc-service os)
           (service fstab-service-type '())
           (session-environment-service
            (operating-system-environment-variables os))
           host-name procs root-fs unmount
           (service setuid-program-service-type
                    (operating-system-setuid-programs os))
           (service profile-service-type
                    (operating-system-packages os))
           (append other-fs mappings swaps

                   ;; Add the firmware service, unless we are building for a
                   ;; container.
                   (if container?
                       '()
                       (list %linux-bare-metal-service
                             (service firmware-service-type
                                      (operating-system-firmware os))))))))

(define* (operating-system-services os #:key container?)
  "Return all the services of OS, including \"internal\" services that do not
explicitly appear in OS."
  (append (operating-system-user-services os)
          (essential-services os #:container? container?)))


;;;
;;; /etc.
;;;

(define %base-firmware
  ;; Firmware usable by default.
  (list ath9k-htc-firmware))

(define %base-packages
  ;; Default set of packages globally visible.  It should include anything
  ;; required for basic administrator tasks.
  (cons* procps psmisc which less zile nano
         lsof                                 ;for Guix's 'list-runtime-roots'
         pciutils usbutils
         util-linux inetutils isc-dhcp

         ;; wireless-tools is deprecated in favor of iw, but it's still what
         ;; many people are familiar with, so keep it around.
         iw wireless-tools rfkill

         iproute
         net-tools                        ; XXX: remove when Inetutils suffices
         man-db
         texinfo                               ;for the standalone Info reader

         ;; The 'sudo' command is already in %SETUID-PROGRAMS, but we also
         ;; want the other commands and the man pages (notably because
         ;; auto-completion in Emacs shell relies on man pages.)
         sudo

         ;; Get 'insmod' & co. from kmod, not module-init-tools, since udev
         ;; already depends on it anyway.
         kmod eudev

         e2fsprogs kbd

         bash-completion

         ;; The packages below are also in %FINAL-INPUTS, so take them from
         ;; there to avoid duplication.
         (map canonical-package
              (list guile-2.0 bash coreutils findutils grep sed
                    diffutils patch gawk tar gzip bzip2 xz lzip))))

(define %default-issue
  ;; Default contents for /etc/issue.
  "
This is the GNU system.  Welcome.\n")

(define (local-host-aliases host-name)
  "Return aliases for HOST-NAME, to be used in /etc/hosts."
  (string-append "127.0.0.1 localhost " host-name "\n"
                 "::1       localhost " host-name "\n"))

(define (default-/etc/hosts host-name)
  "Return the default /etc/hosts file."
  (plain-file "hosts" (local-host-aliases host-name)))

(define* (operating-system-etc-service os)
  "Return a <service> that builds containing the static part of the /etc
directory."
  (let ((login.defs (plain-file "login.defs" "# Empty for now.\n"))

        (issue      (plain-file "issue" (operating-system-issue os)))
        (nsswitch   (plain-file "nsswitch.conf"
                                (name-service-switch->string
                                 (operating-system-name-service-switch os))))

        ;; Startup file for POSIX-compliant login shells, which set system-wide
        ;; environment variables.
        (profile    (mixed-text-file "profile"  "\
# Crucial variables that could be missing in the profiles' 'etc/profile'
# because they would require combining both profiles.
# FIXME: See <http://bugs.gnu.org/20255>.
export MANPATH=$HOME/.guix-profile/share/man:/run/current-system/profile/share/man
export INFOPATH=$HOME/.guix-profile/share/info:/run/current-system/profile/share/info
export XDG_DATA_DIRS=$HOME/.guix-profile/share:/run/current-system/profile/share
export XDG_CONFIG_DIRS=$HOME/.guix-profile/etc/xdg:/run/current-system/profile/etc/xdg

# Ignore the default value of 'PATH'.
unset PATH

# Load the system profile's settings.
GUIX_PROFILE=/run/current-system/profile \\
. /run/current-system/profile/etc/profile

# Prepend setuid programs.
export PATH=/run/setuid-programs:$PATH

if [ -f \"$HOME/.guix-profile/etc/profile\" ]
then
  # Load the user profile's settings.
  GUIX_PROFILE=\"$HOME/.guix-profile\" \\
  . \"$HOME/.guix-profile/etc/profile\"
else
  # At least define this one so that basic things just work
  # when the user installs their first package.
  export PATH=\"$HOME/.guix-profile/bin:$PATH\"
fi

# Since 'lshd' does not use pam_env, /etc/environment must be explicitly
# loaded when someone logs in via SSH.  See <http://bugs.gnu.org/22175>.
# We need 'PATH' to be defined here, for 'cat' and 'cut'.
if [ -f /etc/environment -a -n \"$SSH_CLIENT\" \\
     -a -z \"$LINUX_MODULE_DIRECTORY\" ]
then
  . /etc/environment
  export `cat /etc/environment | cut -d= -f1`
fi

# Set the umask, notably for users logging in via 'lsh'.
# See <http://bugs.gnu.org/22650>.
umask 022

# Allow GStreamer-based applications to find plugins.
export GST_PLUGIN_PATH=\"$HOME/.guix-profile/lib/gstreamer-1.0\"

if [ -n \"$BASH_VERSION\" -a -f /etc/bashrc ]
then
  # Load Bash-specific initialization code.
  . /etc/bashrc
fi
"))

        (bashrc    (plain-file "bashrc" "\
# Bash-specific initialization.

# The 'bash-completion' package.
if [ -f /run/current-system/profile/etc/profile.d/bash_completion.sh ]
then
  # Bash-completion sources ~/.bash_completion.  It installs a dynamic
  # completion loader that searches its own completion files as well
  # as those in ~/.guix-profile and /run/current-system/profile.
  source /run/current-system/profile/etc/profile.d/bash_completion.sh
fi\n")))
    (etc-service
     `(("services" ,#~(string-append #$net-base "/etc/services"))
       ("protocols" ,#~(string-append #$net-base "/etc/protocols"))
       ("rpc" ,#~(string-append #$net-base "/etc/rpc"))
       ("login.defs" ,#~#$login.defs)
       ("issue" ,#~#$issue)
       ("nsswitch.conf" ,#~#$nsswitch)
       ("profile" ,#~#$profile)
       ("bashrc" ,#~#$bashrc)
       ("hosts" ,#~#$(or (operating-system-hosts-file os)
                         (default-/etc/hosts (operating-system-host-name os))))
       ("localtime" ,#~(string-append #$tzdata "/share/zoneinfo/"
                                      #$(operating-system-timezone os)))
       ("sudoers" ,(operating-system-sudoers-file os))))))

(define %root-account
  ;; Default root account.
  (user-account
   (name "root")
   (password "")
   (uid 0) (group "root")
   (comment "System administrator")
   (home-directory "/root")))

(define (operating-system-accounts os)
  "Return the user accounts for OS, including an obligatory 'root' account,
and excluding accounts requested by services."
  ;; Make sure there's a root account.
  (if (find (lambda (user)
              (and=> (user-account-uid user) zero?))
            (operating-system-users os))
      (operating-system-users os)
      (cons %root-account (operating-system-users os))))

(define (maybe-string->file file-name thing)
  "If THING is a string, return a <plain-file> with THING as its content.
Otherwise just return THING.

This is for backward-compatibility of fields that used to be strings and are
now file-like objects.."
  (match thing
    ((? string?)
     (warning (_ "using a string for file '~a' is deprecated; \
use 'plain-file' instead~%")
              file-name)
     (plain-file file-name thing))
    (x
     x)))

(define (maybe-file->monadic file-name thing)
  "If THING is a value in %STORE-MONAD, return it as is; otherwise return
THING in the %STORE-MONAD.

This is for backward-compatibility of fields that used to be monadic values
and are now file-like objects."
  (with-monad %store-monad
    (match thing
      ((? procedure?)
       (warning (_ "using a monadic value for '~a' is deprecated; \
use 'plain-file' instead~%")
                file-name)
       thing)
      (x
       (return x)))))

(define (operating-system-etc-directory os)
  "Return that static part of the /etc directory of OS."
  (etc-directory
   (fold-services (operating-system-services os)
                  #:target-type etc-service-type)))

(define (operating-system-environment-variables os)
  "Return the environment variables of OS for
@var{session-environment-service-type}, to be used in @file{/etc/environment}."
  `(("LANG" . ,(operating-system-locale os))
    ("TZ" . ,(operating-system-timezone os))
    ("TZDIR" . ,#~(string-append #$tzdata "/share/zoneinfo"))
    ;; Tell 'modprobe' & co. where to look for modules.
    ("LINUX_MODULE_DIRECTORY" . "/run/booted-system/kernel/lib/modules")
    ;; These variables are honored by OpenSSL (libssl) and Git.
    ("SSL_CERT_DIR" . "/etc/ssl/certs")
    ("SSL_CERT_FILE" . "/etc/ssl/certs/ca-certificates.crt")
    ("GIT_SSL_CAINFO" . "/etc/ssl/certs/ca-certificates.crt")
    ;; By default, applications that use D-Bus, such as Emacs, abort at startup
    ;; when /etc/machine-id is missing.  Make sure these warnings are non-fatal.
    ("DBUS_FATAL_WARNINGS" . "0")))

(define %setuid-programs
  ;; Default set of setuid-root programs.
  (let ((shadow (@ (gnu packages admin) shadow)))
    (list #~(string-append #$shadow "/bin/passwd")
          #~(string-append #$shadow "/bin/su")
          #~(string-append #$inetutils "/bin/ping")
          #~(string-append #$inetutils "/bin/ping6")
          #~(string-append #$sudo "/bin/sudo")
          #~(string-append #$fuse "/bin/fusermount"))))

(define %sudoers-specification
  ;; Default /etc/sudoers contents: 'root' and all members of the 'wheel'
  ;; group can do anything.  See
  ;; <http://www.sudo.ws/sudo/man/1.8.10/sudoers.man.html>.
  ;; TODO: Add a declarative API.
  (plain-file "sudoers" "\
root ALL=(ALL) ALL
%wheel ALL=(ALL) ALL\n"))

(define* (operating-system-activation-script os #:key container?)
  "Return the activation script for OS---i.e., the code that \"activates\" the
stateful part of OS, including user accounts and groups, special directories,
etc."
  (let* ((services   (operating-system-services os #:container? container?))
         (activation (fold-services services
                                    #:target-type activation-service-type)))
    (activation-service->script activation)))

(define* (operating-system-boot-script os #:key container?)
  "Return the boot script for OS---i.e., the code started by the initrd once
we're running in the final root.  When CONTAINER? is true, skip all
hardware-related operations as necessary when booting a Linux container."
  (let* ((services (operating-system-services os #:container? container?))
         (boot     (fold-services services #:target-type boot-service-type)))
    ;; BOOT is the script as a monadic value.
    (service-parameters boot)))

(define* (operating-system-derivation os #:key container?)
  "Return a derivation that builds OS."
  (let* ((services (operating-system-services os #:container? container?))
         (system   (fold-services services)))
    ;; SYSTEM contains the derivation as a monadic value.
    (service-parameters system)))

(define* (operating-system-profile os #:key container?)
  "Return a derivation that builds the system profile of OS."
  (mlet* %store-monad
      ((services -> (operating-system-services os #:container? container?))
       (profile (fold-services services
                               #:target-type profile-service-type)))
    (match profile
      (("profile" profile)
       (return profile)))))

(define (operating-system-root-file-system os)
  "Return the root file system of OS."
  (find (match-lambda
         (($ <file-system> _ _ "/") #t)
         (_ #f))
        (operating-system-file-systems os)))

(define (operating-system-initrd-file os)
  "Return a gexp denoting the initrd file of OS."
  (define boot-file-systems
    (filter file-system-needed-for-boot?
            (operating-system-file-systems os)))

  (define mapped-devices
    (operating-system-boot-mapped-devices os))

  (define make-initrd
    (operating-system-initrd os))

  (mlet %store-monad ((initrd (make-initrd boot-file-systems
                                           #:linux (operating-system-kernel os)
                                           #:mapped-devices mapped-devices)))
    (return #~(string-append #$initrd "/initrd"))))

(define (locale-name->definition* name)
  "Variant of 'locale-name->definition' that raises an error upon failure."
  (match (locale-name->definition name)
    (#f
     (raise (condition
             (&message
              (message (format #f (_ "~a: invalid locale name") name))))))
    (def def)))

(define (operating-system-locale-directory os)
  "Return the directory containing the locales compiled for the definitions
listed in OS.  The C library expects to find it under
/run/current-system/locale."
  (define name
    (operating-system-locale os))

  (define definitions
    ;; While we're at it, check whether NAME is defined and add it if needed.
    (if (member name (map locale-definition-name
                          (operating-system-locale-definitions os)))
        (operating-system-locale-definitions os)
        (cons (locale-name->definition* name)
              (operating-system-locale-definitions os))))

  (locale-directory definitions
                    #:libcs (operating-system-locale-libcs os)))

(define (kernel->grub-label kernel)
  "Return a label for the GRUB menu entry that boots KERNEL."
  (string-append "GNU with "
                 (string-titlecase (package-name kernel)) " "
                 (package-version kernel)
                 " (beta)"))

(define (store-file-system file-systems)
  "Return the file system object among FILE-SYSTEMS that contains the store."
  (match (filter (lambda (fs)
                   (and (file-system-mount? fs)
                        (not (memq 'bind-mount (file-system-flags fs)))
                        (string-prefix? (file-system-mount-point fs)
                                        (%store-prefix))))
                 file-systems)
    ((and candidates (head . tail))
     (reduce (lambda (fs1 fs2)
               (if (> (string-length (file-system-mount-point fs1))
                      (string-length (file-system-mount-point fs2)))
                   fs1
                   fs2))
             head
             candidates))))

(define (operating-system-store-file-system os)
  "Return the file system that contains the store of OS."
  (store-file-system (operating-system-file-systems os)))

(define* (operating-system-grub.cfg os #:optional (old-entries '()))
  "Return the GRUB configuration file for OS.  Use OLD-ENTRIES to populate the
\"old entries\" menu."
  (mlet* %store-monad
      ((system      (operating-system-derivation os))
       (root-fs ->  (operating-system-root-file-system os))
       (store-fs -> (operating-system-store-file-system os))
       (kernel ->   (operating-system-kernel os))
       (root-device -> (if (eq? 'uuid (file-system-title root-fs))
                           (uuid->string (file-system-device root-fs))
                           (file-system-device root-fs)))
       (entries ->  (list (menu-entry
                           (label (kernel->grub-label kernel))
                           (linux kernel)
                           (linux-arguments
                            (cons* (string-append "--root=" root-device)
                                   #~(string-append "--system=" #$system)
                                   #~(string-append "--load=" #$system
                                                    "/boot")
                                   (operating-system-kernel-arguments os)))
                           (initrd #~(string-append #$system "/initrd"))))))
    (grub-configuration-file (operating-system-bootloader os)
                             store-fs entries
                             #:old-entries old-entries)))

(define (operating-system-parameters-file os)
  "Return a file that describes the boot parameters of OS.  The primary use of
this file is the reconstruction of GRUB menu entries for old configurations."
  (mlet %store-monad ((initrd   (operating-system-initrd-file os))
                      (root ->  (operating-system-root-file-system os))
                      (label -> (kernel->grub-label
                                 (operating-system-kernel os))))
    (gexp->file "parameters"
                #~(boot-parameters (version 0)
                                   (label #$label)
                                   (root-device #$(file-system-device root))
                                   (kernel #$(operating-system-kernel os))
                                   (kernel-arguments
                                    #$(operating-system-kernel-arguments os))
                                   (initrd #$initrd)))))


;;;
;;; Boot parameters
;;;

(define-record-type* <boot-parameters>
  boot-parameters make-boot-parameters boot-parameters?
  (label            boot-parameters-label)
  (root-device      boot-parameters-root-device)
  (kernel           boot-parameters-kernel)
  (kernel-arguments boot-parameters-kernel-arguments))

(define (read-boot-parameters port)
  "Read boot parameters from PORT and return the corresponding
<boot-parameters> object or #f if the format is unrecognized."
  (match (read port)
    (('boot-parameters ('version 0)
                       ('label label) ('root-device root)
                       ('kernel linux)
                       rest ...)
     (boot-parameters
      (label label)
      (root-device root)
      (kernel linux)
      (kernel-arguments
       (match (assq 'kernel-arguments rest)
         ((_ args) args)
         (#f       '())))))                       ;the old format
    (x                                            ;unsupported format
     (warning (_ "unrecognized boot parameters for '~a'~%")
              system)
     #f)))

;;; system.scm ends here