aboutsummaryrefslogtreecommitdiff
path: root/gnu/system/grub.scm
blob: 4f9bde6a626b4a0f47a3e653611da0842bdf0eca (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
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2016 Chris Marusich <cmmarusich@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 grub)
  #:use-module (guix store)
  #:use-module (guix packages)
  #:use-module (guix derivations)
  #:use-module (guix records)
  #:use-module (guix monads)
  #:use-module (guix gexp)
  #:use-module (guix download)
  #:use-module (gnu artwork)
  #:use-module (gnu system file-systems)
  #:autoload   (gnu packages bootloaders) (grub)
  #:autoload   (gnu packages compression) (gzip)
  #:autoload   (gnu packages gtk) (guile-cairo guile-rsvg)
  #:use-module (ice-9 match)
  #:use-module (ice-9 regex)
  #:use-module (srfi srfi-1)
  #:use-module (rnrs bytevectors)
  #:export (grub-image
            grub-image?
            grub-image-aspect-ratio
            grub-image-file

            grub-theme
            grub-theme?
            grub-theme-images
            grub-theme-color-normal
            grub-theme-color-highlight

            %background-image
            %default-theme

            grub-configuration
            grub-configuration?
            grub-configuration-device
            grub-configuration-grub

            menu-entry
            menu-entry?

            grub-configuration-file))

;;; Commentary:
;;;
;;; Configuration of GNU GRUB.
;;;
;;; Code:

(define (strip-mount-point mount-point file)
  "Strip MOUNT-POINT from FILE, which is a gexp or other lowerable object
denoting a file name."
  (if (string=? mount-point "/")
      file
      #~(let ((file #$file))
          (if (string-prefix? #$mount-point file)
              (substring #$file #$(string-length mount-point))
              file))))

(define-record-type* <grub-image>
  grub-image make-grub-image
  grub-image?
  (aspect-ratio    grub-image-aspect-ratio        ;rational number
                   (default 4/3))
  (file            grub-image-file))              ;file-valued gexp (SVG)

(define-record-type* <grub-theme>
  grub-theme make-grub-theme
  grub-theme?
  (images          grub-theme-images
                   (default '()))                 ;list of <grub-image>
  (color-normal    grub-theme-color-normal
                   (default '((fg . cyan) (bg . blue))))
  (color-highlight grub-theme-color-highlight
                   (default '((fg . white) (bg . blue)))))

(define %background-image
  (grub-image
   (aspect-ratio 4/3)
   (file (file-append %artwork-repository
                      "/grub/GuixSD-fully-black-4-3.svg"))))

(define %default-theme
  ;; Default theme contributed by Felipe López.
  (grub-theme
   (images (list %background-image))
   (color-highlight '((fg . yellow) (bg . black)))
   (color-normal    '((fg . light-gray) (bg . black))))) ;XXX: #x303030

(define-record-type* <grub-configuration>
  grub-configuration make-grub-configuration
  grub-configuration?
  (grub            grub-configuration-grub           ; package
                   (default (@ (gnu packages bootloaders) grub)))
  (device          grub-configuration-device)        ; string
  (menu-entries    grub-configuration-menu-entries   ; list
                   (default '()))
  (default-entry   grub-configuration-default-entry  ; integer
                   (default 0))
  (timeout         grub-configuration-timeout        ; integer
                   (default 5))
  (theme           grub-configuration-theme          ; <grub-theme>
                   (default %default-theme)))

(define-record-type* <menu-entry>
  menu-entry make-menu-entry
  menu-entry?
  (label           menu-entry-label)
  (device          menu-entry-device       ; file system uuid, label, or #f
                   (default #f))
  (device-mount-point menu-entry-device-mount-point
                      (default "/"))
  (linux           menu-entry-linux)
  (linux-arguments menu-entry-linux-arguments
                   (default '()))          ; list of string-valued gexps
  (initrd          menu-entry-initrd))     ; file name of the initrd as a gexp


;;;
;;; Background image & themes.
;;;

(define* (svg->png svg #:key width height)
  "Build a PNG of HEIGHT x WIDTH from SVG."
  (gexp->derivation "grub-image.png"
                    (with-imported-modules '((gnu build svg))
                      #~(begin
                          ;; We need these two libraries.
                          (add-to-load-path (string-append #$guile-rsvg
                                                           "/share/guile/site/"
                                                           (effective-version)))
                          (add-to-load-path (string-append #$guile-cairo
                                                           "/share/guile/site/"
                                                           (effective-version)))

                          (use-modules (gnu build svg))
                          (svg->png #$svg #$output
                                    #:width #$width
                                    #:height #$height)))))

(define* (grub-background-image config #:key (width 1024) (height 768))
  "Return the GRUB background image defined in CONFIG with a ratio of
WIDTH/HEIGHT, or #f if none was found."
  (let* ((ratio (/ width height))
         (image (find (lambda (image)
                        (= (grub-image-aspect-ratio image) ratio))
                      (grub-theme-images (grub-configuration-theme config)))))
    (if image
        (svg->png (grub-image-file image)
                  #:width width #:height height)
        (with-monad %store-monad
          (return #f)))))

(define* (eye-candy config store-device store-mount-point
                    #:key system port)
  "Return in %STORE-MONAD a gexp that writes to PORT (a port-valued gexp) the
'grub.cfg' part concerned with graphics mode, background images, colors, and
all that.  STORE-DEVICE designates the device holding the store, and
STORE-MOUNT-POINT is its mount point; these are used to determine where the
background image and fonts must be searched for.  SYSTEM must be the target
system string---e.g., \"x86_64-linux\"."
  (define setup-gfxterm-body
    ;; Intel and EFI systems need to be switched into graphics mode, whereas
    ;; most other modern architectures have no other mode and therefore don't
    ;; need to be switched.
    (if (string-match "^(x86_64|i[3-6]86)-" system)
        "
  # Leave 'gfxmode' to 'auto'.
  insmod video_bochs
  insmod video_cirrus
  insmod gfxterm

  if [ \"${grub_platform}\" == efi ]; then
    # This is for (U)EFI systems (these modules are unavailable in the
    # non-EFI GRUB.)  If we don't load them, GRUB boots in \"blind mode\",
    # which isn't convenient.
    insmod efi_gop
    insmod efi_uga
  else
    # These are specific to non-EFI Intel machines.
    insmod vbe
    insmod vga
  fi

  terminal_output gfxterm
"
        ""))

  (define (theme-colors type)
    (let* ((theme  (grub-configuration-theme config))
           (colors (type theme)))
      (string-append (symbol->string (assoc-ref colors 'fg)) "/"
                     (symbol->string (assoc-ref colors 'bg)))))

  (define font-file
    (strip-mount-point store-mount-point
                       (file-append grub "/share/grub/unicode.pf2")))

  (mlet* %store-monad ((image (grub-background-image config)))
    (return (and image
                 #~(format #$port "
function setup_gfxterm {~a}

# Set 'root' to the partition that contains /gnu/store.
~a

if loadfont ~a; then
  setup_gfxterm
fi

insmod png
if background_image ~a; then
  set color_normal=~a
  set color_highlight=~a
else
  set menu_color_normal=cyan/blue
  set menu_color_highlight=white/blue
fi~%"
                           #$setup-gfxterm-body
                           #$(grub-root-search store-device font-file)
                           #$font-file

                           #$(strip-mount-point store-mount-point image)
                           #$(theme-colors grub-theme-color-normal)
                           #$(theme-colors grub-theme-color-highlight))))))


;;;
;;; Configuration file.
;;;

(define (grub-root-search device file)
  "Return the GRUB 'search' command to look for DEVICE, which contains FILE,
a gexp.  The result is a gexp that can be inserted in the grub.cfg-generation
code."
  ;; Usually FILE is a file name gexp like "/gnu/store/…-linux/vmlinuz", but
  ;; it can also be something like "(hd0,msdos1)/vmlinuz" in the case of
  ;; custom menu entries.  In the latter case, don't emit a 'search' command.
  (if (and (string? file) (not (string-prefix? "/" file)))
      ""
      (match device
        ;; Preferably refer to DEVICE by its UUID or label.  This is more
        ;; efficient and less ambiguous, see <http://bugs.gnu.org/22281>.
        ((? bytevector? uuid)
         (format #f "search --fs-uuid --set ~a"
                 (uuid->string device)))
        ((? string? label)
         (format #f "search --label --set ~a" label))
        (#f
         #~(format #f "search --file --set ~a" #$file)))))

(define* (grub-configuration-file config entries
                                  #:key
                                  (system (%current-system))
                                  (old-entries '()))
  "Return the GRUB configuration file corresponding to CONFIG, a
<grub-configuration> object, and where the store is available at STORE-FS, a
<file-system> object.  OLD-ENTRIES is taken to be a list of menu entries
corresponding to old generations of the system."
  (define all-entries
    (append entries (grub-configuration-menu-entries config)))

  (define entry->gexp
    (match-lambda
     (($ <menu-entry> label device device-mount-point
                      linux arguments initrd)
      ;; Here DEVICE is the store and DEVICE-MOUNT-POINT is its mount point.
      ;; Use the right file names for LINUX and INITRD in case
      ;; DEVICE-MOUNT-POINT is not "/", meaning that the store is on a
      ;; separate partition.
      (let ((linux  (strip-mount-point device-mount-point linux))
            (initrd (strip-mount-point device-mount-point initrd)))
        #~(format port "menuentry ~s {
  ~a
  linux ~a ~a
  initrd ~a
}~%"
                  #$label
                  #$(grub-root-search device linux)
                  #$linux (string-join (list #$@arguments))
                  #$initrd)))))

  (mlet %store-monad ((sugar (eye-candy config
                                        (menu-entry-device (first entries))
                                        (menu-entry-device-mount-point
                                         (first entries))
                                        #:system system
                                        #:port #~port)))
    (define builder
      #~(call-with-output-file #$output
          (lambda (port)
            (format port
                    "# This file was generated from your GuixSD configuration.  Any changes
# will be lost upon reconfiguration.
")
            #$sugar
            (format port "
set default=~a
set timeout=~a~%"
                    #$(grub-configuration-default-entry config)
                    #$(grub-configuration-timeout config))
            #$@(map entry->gexp all-entries)

            #$@(if (pair? old-entries)
                   #~((format port "
submenu \"GNU system, old configurations...\" {~%")
                      #$@(map entry->gexp old-entries)
                      (format port "}~%"))
                   #~()))))

    (gexp->derivation "grub.cfg" builder)))

;;; grub.scm ends here