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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015, 2016 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 (gnu artwork)
#:use-module (gnu system file-systems)
#:autoload (gnu packages grub) (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)
#: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 (strip-mount-point fs file)
"Strip the mount point of FS from FILE, which is a gexp or other lowerable
object denoting a file name."
(let ((mount-point (file-system-mount-point fs)))
(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 #~(string-append #$%artwork-repository
"/grub/GuixSD-fully-black-4-3.svg"))))
(define %default-theme
;; Default theme contributed by Felipe López.
(grub-theme
(images (list %background-image))
(color-highlight '((fg . yellow) (bg . black)))
(color-normal '((fg . light-gray) (bg . black))))) ;XXX: #x303030
(define-record-type* <grub-configuration>
grub-configuration make-grub-configuration
grub-configuration?
(grub grub-configuration-grub ; package
(default (@ (gnu packages grub) grub)))
(device grub-configuration-device) ; string
(menu-entries grub-configuration-menu-entries ; list
(default '()))
(default-entry grub-configuration-default-entry ; integer
(default 0))
(timeout grub-configuration-timeout ; integer
(default 5))
(theme grub-configuration-theme ; <grub-theme>
(default %default-theme)))
(define-record-type* <menu-entry>
menu-entry make-menu-entry
menu-entry?
(label menu-entry-label)
(linux menu-entry-linux)
(linux-arguments menu-entry-linux-arguments
(default '())) ; list of string-valued gexps
(initrd menu-entry-initrd)) ; file name of the initrd as a gexp
;;;
;;; Background image & themes.
;;;
(define* (svg->png svg #:key width height)
"Build a PNG of HEIGHT x WIDTH from SVG."
(gexp->derivation "grub-image.png"
(with-imported-modules '((gnu build svg))
#~(begin
;; We need these two libraries.
(add-to-load-path (string-append #$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 #$height)))))
(define* (grub-background-image config #:key (width 1024) (height 768))
"Return the GRUB background image defined in CONFIG with a ratio of
WIDTH/HEIGHT, or #f if none was found."
(let* ((ratio (/ width height))
(image (find (lambda (image)
(= (grub-image-aspect-ratio image) ratio))
(grub-theme-images (grub-configuration-theme config)))))
(if image
(svg->png (grub-image-file image)
#:width width #:height height)
(with-monad %store-monad
(return #f)))))
(define (eye-candy config root-fs system port)
"Return in %STORE-MONAD a gexp that writes to PORT (a port-valued gexp) the
'grub.cfg' part concerned with graphics mode, background images, colors, and
all that. ROOT-FS is a file-system object denoting the root file system where
the store is. SYSTEM must be the target system string---e.g.,
\"x86_64-linux\"."
(define setup-gfxterm-body
;; Intel systems need to be switched into graphics mode, whereas most
;; other modern architectures have no other mode and therefore don't need
;; to be switched.
(if (string-match "^(x86_64|i[3-6]86)-" system)
"
# Leave 'gfxmode' to 'auto'.
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
insmod gfxterm
terminal_output gfxterm
"
""))
(define (theme-colors type)
(let* ((theme (grub-configuration-theme config))
(colors (type theme)))
(string-append (symbol->string (assoc-ref colors 'fg)) "/"
(symbol->string (assoc-ref colors 'bg)))))
(define font-file
(strip-mount-point root-fs
(file-append grub "/share/grub/unicode.pf2")))
(mlet* %store-monad ((image (grub-background-image config)))
(return (and image
#~(format #$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 root-fs font-file)
#$font-file
#$(strip-mount-point root-fs image)
#$(theme-colors grub-theme-color-normal)
#$(theme-colors grub-theme-color-highlight))))))
;;;
;;; Configuration file.
;;;
(define (grub-root-search root-fs file)
"Return the GRUB 'search' command to look for ROOT-FS, 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)))
""
(case (file-system-title root-fs)
;; Preferably refer to ROOT-FS by its UUID or label. This is more
;; efficient and less ambiguous, see <>.
((uuid)
(format #f "search --fs-uuid --set ~a"
(uuid->string (file-system-device root-fs))))
((label)
(format #f "search --label --set ~a"
(file-system-device root-fs)))
(else
;; As a last resort, look for any device containing FILE.
#~(format #f "search --file --set ~a" #$file)))))
(define* (grub-configuration-file config store-fs entries
#:key
(system (%current-system))
(old-entries '()))
"Return the GRUB configuration file corresponding to CONFIG, a
<grub-configuration> object, and where the store is available at STORE-FS, a
<file-system> object. OLD-ENTRIES is taken to be a list of menu entries
corresponding to old generations of the system."
(define all-entries
(append entries (grub-configuration-menu-entries config)))
(define entry->gexp
(match-lambda
(($ <menu-entry> label linux arguments initrd)
;; Use the right file names for LINUX and STORE-FS in case STORE-FS is
;; not the "/" file system.
(let ((linux (strip-mount-point store-fs linux))
(initrd (strip-mount-point store-fs initrd)))
#~(format port "menuentry ~s {
~a
linux ~a ~a
initrd ~a
}~%"
#$label
#$(grub-root-search store-fs linux)
#$linux (string-join (list #$@arguments))
#$initrd)))))
(mlet %store-monad ((sugar (eye-candy config store-fs system #~port)))
(define builder
#~(call-with-output-file #$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
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