aboutsummaryrefslogtreecommitdiff
path: root/gnu/image.scm
blob: 523653dd77833c2ab3eeaf8f040343b621f24754 (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
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020, 2022 Mathieu Othacehe <othacehe@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 (gnu image)
  #:use-module (guix platform)
  #:use-module (guix records)
  #:use-module (guix diagnostics)
  #:use-module (guix i18n)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:export (partition
            partition?
            partition-device
            partition-size
            partition-offset
            partition-file-system
            partition-file-system-options
            partition-label
            partition-uuid
            partition-flags
            partition-initializer

            image
            image?
            image-name
            image-format
            image-platform
            image-size
            image-operating-system
            image-partition-table-type
            image-partitions
            image-compression?
            image-volatile-root?
            image-shared-store?
            image-shared-network?
            image-substitutable?

            image-type
            image-type?
            image-type-name
            image-type-constructor

            os->image
            os+platform->image))


;;;
;;; Sanitizers.
;;;

;; Image and partition sizes can be either be a size in bytes or the 'guess
;; symbol denoting that the size should be estimated by Guix, according to the
;; image content.
(define-with-syntax-properties (validate-size (value properties))
  (unless (and value
               (or (eq? value 'guess) (integer? value)))
    (raise
       (make-compound-condition
        (condition
         (&error-location
          (location (source-properties->location properties))))
        (formatted-message
         (G_ "size (~a) can only be 'guess or a numeric expression ~%")
         value 'field))))
  value)


;;;
;;; Partition record.
;;;

;; The partition offset should be a bytes count as an integer.
(define-with-syntax-properties (validate-partition-offset (value properties))
  (unless (and value (integer? value))
    (raise
       (make-compound-condition
        (condition
         (&error-location
          (location (source-properties->location properties))))
        (formatted-message
         (G_ "the partition offset (~a) can only be a \
numeric expression ~%") value 'field))))
  value)

;; The supported partition flags.
(define-with-syntax-properties (validate-partition-flags (value properties))
  (let ((bad-flags (lset-difference eq? value '(boot esp))))
    (unless (and (list? value) (null? bad-flags))
      (raise
       (make-compound-condition
        (condition
         (&error-location
          (location (source-properties->location properties))))
        (formatted-message
         (G_ "unsupported partition flag(s): ~a ~%") bad-flags)))))
  value)

(define-record-type* <partition> partition make-partition
  partition?
  (size                 partition-size   ;size in bytes as integer or 'guess
                        (default 'guess)
                        (sanitize validate-size))
  (offset               partition-offset
                        (default 0)   ;offset in bytes as integer
                        (sanitize validate-partition-offset))
  (file-system          partition-file-system
                        (default "ext4"))  ;string
  (file-system-options  partition-file-system-options
                        (default '()))  ;list of strings
  (label                partition-label)  ;string
  (uuid                 partition-uuid
                        (default #false))  ;<uuid>
  (flags                partition-flags
                        (default '())  ;list of symbols
                        (sanitize validate-partition-flags))
  (initializer          partition-initializer
                        (default #false))) ;gexp | #false


;;;
;;; Image record.
;;;

(define-syntax-rule (define-set-sanitizer name field set)
  "Define NAME as a procedure or macro that raises an error if passed a value
that is not in SET, mentioning FIELD in the error message."
  (define-with-syntax-properties (name (value properties))
    (unless (memq value 'set)
      (raise
       (make-compound-condition
        (condition
         (&error-location
          (location (source-properties->location properties))))
        (formatted-message (G_ "~s: invalid '~a' value") value 'field))))
    value))

;; The supported image formats.
(define-set-sanitizer validate-image-format format
  (disk-image compressed-qcow2 docker iso9660 tarball wsl2))

;; The supported partition table types.
(define-set-sanitizer validate-partition-table-type partition-table-type
  (mbr gpt))

(define-record-type* <image>
  image make-image
  image?
  (name               image-name ;symbol
                      (default #false))
  (format             image-format                ;symbol
                      (sanitize validate-image-format))
  (platform           image-platform ;<platform>
                      (default #false))
  (size               image-size  ;size in bytes as integer
                      (default 'guess)
                      (sanitize validate-size))
  (operating-system   image-operating-system)  ;<operating-system>
  (partition-table-type image-partition-table-type ; 'mbr or 'gpt
                      (default 'mbr)
                      (sanitize validate-partition-table-type))
  (partitions         image-partitions ;list of <partition>
                      (default '()))
  (compression?       image-compression? ;boolean
                      (default #true))
  (volatile-root?     image-volatile-root? ;boolean
                      (default #true))
  (shared-store?      image-shared-store? ;boolean
                      (default #false))
  (shared-network?    image-shared-network? ;boolean
                      (default #false))
  (substitutable?     image-substitutable? ;boolean
                      (default #true)))


;;;
;;; Image type.
;;;

;; The role of this record is to provide a constructor that is able to turn an
;; <operating-system> record into an <image> record.  Some basic <image-type>
;; records are defined in the (gnu system image) module.  They are able to
;; turn an <operating-system> record into an EFI or an ISO 9660 bootable
;; image, a Docker image or even a QCOW2 image.
;;
;; Other <image-type> records are defined in the (gnu system images ...)
;; modules.  They are dedicated to specific machines such as Novena and Pine64
;; SoC boards that require specific images.
;;
;; All the available <image-type> records are collected by the 'image-modules'
;; procedure.  This allows the "guix system image" command to turn a given
;; <operating-system> record into an image, thanks to the specified
;; <image-type>.  In that case, the <image-type> look up is done using the
;; name field of the <image-type> record.

(define-record-type* <image-type>
  image-type make-image-type
  image-type?
  (name           image-type-name) ;symbol
  (constructor    image-type-constructor)) ;<operating-system> -> <image>


;;;
;;; Image creation.
;;;

(define* (os->image os #:key type)
  "Use the image constructor from TYPE, an <image-type> record to turn the
given OS, an <operating-system> record into an image and return it."
  (let ((constructor (image-type-constructor type)))
    (constructor os)))

(define* (os+platform->image os platform #:key type)
  "Use the image constructor from TYPE, an <image-type> record to turn the
given OS, an <operating-system> record into an image targeting PLATFORM, a
<platform> record and return it."
  (image
   (inherit (os->image os #:type type))
   (platform platform)))