summary refs log tree commit diff
path: root/gnu/system/grub.scm
blob: 67375b45cf6cd94e0c6db1bce700286182108e5e (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
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@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 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 (guix git-download)
  #:autoload   (gnu packages grub) (grub)
  #:autoload   (gnu packages inkscape) (inkscape)
  #:autoload   (gnu packages imagemagick) (imagemagick)
  #:autoload   (gnu packages compression) (gzip)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-1)
  #: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

            menu-entry
            menu-entry?

            grub-configuration-file))

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

(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 %artwork-repository
  (origin
    (method git-fetch)
    (uri (git-reference
          (url "git://git.savannah.gnu.org/guix/guix-artwork.git")
          (commit "281157a")))
    (sha256
     (base32
      "02x1myh013mzqnr28d4k1mxs4malv5vszpxdwkjarbhbbkchypz5"))))

(define %background-image
  (grub-image
   (aspect-ratio 4/3)
   (file #~(string-append #$%artwork-repository "/grub/guix-4-3.svg"))))

(define %default-theme
  ;; Default theme contributed by Felipe López.
  (grub-theme
   (images (list %background-image))
   (color-highlight '((fg . white) (bg . black))) ;XXX: fg should be #x3bb7f5
   (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 grub) 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)
  (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)
  "Build a PNG from SVG."
  ;; Don't use #:local-build? so that it's substitutable.
  (gexp->derivation "grub-image.png"
                    #~(zero?
                       (system* (string-append #$inkscape "/bin/inkscape")
                                "--without-gui"
                                (string-append "--export-png=" #$output)
                                #$svg))))

(define (resize-image image width height)
  "Resize IMAGE to WIDTHxHEIGHT."
  ;; Don't use #:local-build? so that it's substitutable.
  (let ((size (string-append (number->string width)
                             "x" (number->string height))))
    (gexp->derivation "grub-image.resized.png"
                      #~(zero?
                         (system* (string-append #$imagemagick "/bin/convert")
                                  "-resize" #$size #$image #$output)))))

(define* (grub-background-image config #:key (width 640) (height 480))
  "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
        (mlet %store-monad ((png (svg->png (grub-image-file image))))
          (resize-image png width height))
        (with-monad %store-monad
          (return #f)))))

(define (eye-candy config 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."
  (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)))))

  (mlet* %store-monad ((image (grub-background-image config)))
    (return (and image #~(format #$port "
function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

if loadfont ~a/share/grub/unicode.pf2; then
  set gfxmode=640x480
  load_video
  insmod gfxterm
  terminal_output 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~%"
                        #$grub
                        #$image
                        #$(theme-colors grub-theme-color-normal)
                        #$(theme-colors grub-theme-color-highlight))))))


;;;
;;; Configuration 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.  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 linux arguments initrd)
      #~(format port "menuentry ~s {
  linux ~a/bzImage ~a
  initrd ~a
}~%"
                #$label
                #$linux (string-join (list #$@arguments))
                #$initrd))))

  (mlet %store-monad ((sugar (eye-candy config #~port)))
    (define builder
      #~(call-with-output-file #$output
          (lambda (port)
            #$sugar
            (format port "
set default=~a
set timeout=~a
search.file ~a/bzImage~%"
                    #$(grub-configuration-default-entry config)
                    #$(grub-configuration-timeout config)
                    #$(any (match-lambda
                            (($ <menu-entry> _ linux)
                             linux))
                           all-entries))
            #$@(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