329 lines
12 KiB
Scheme
329 lines
12 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu system grub)
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#:use-module (guix store)
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#:use-module (guix packages)
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#:use-module (guix derivations)
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#:use-module (guix records)
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#:use-module (guix monads)
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#:use-module (guix gexp)
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#:use-module (guix download)
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#:use-module (gnu artwork)
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#:use-module (gnu system file-systems)
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#:autoload (gnu packages grub) (grub)
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#:autoload (gnu packages compression) (gzip)
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#:autoload (gnu packages gtk) (guile-cairo guile-rsvg)
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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:use-module (srfi srfi-1)
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#:use-module (rnrs bytevectors)
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#:export (grub-image
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grub-image?
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grub-image-aspect-ratio
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grub-image-file
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grub-theme
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grub-theme?
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grub-theme-images
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grub-theme-color-normal
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grub-theme-color-highlight
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%background-image
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%default-theme
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grub-configuration
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grub-configuration?
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grub-configuration-device
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grub-configuration-grub
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menu-entry
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menu-entry?
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grub-configuration-file))
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;;; Commentary:
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;;;
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;;; Configuration of GNU GRUB.
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;;;
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;;; Code:
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(define (strip-mount-point mount-point file)
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"Strip MOUNT-POINT from FILE, which is a gexp or other lowerable object
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denoting a file name."
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(if (string=? mount-point "/")
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file
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#~(let ((file #$file))
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(if (string-prefix? #$mount-point file)
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(substring #$file #$(string-length mount-point))
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file))))
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(define-record-type* <grub-image>
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grub-image make-grub-image
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grub-image?
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(aspect-ratio grub-image-aspect-ratio ;rational number
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(default 4/3))
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(file grub-image-file)) ;file-valued gexp (SVG)
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(define-record-type* <grub-theme>
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grub-theme make-grub-theme
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grub-theme?
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(images grub-theme-images
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(default '())) ;list of <grub-image>
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(color-normal grub-theme-color-normal
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(default '((fg . cyan) (bg . blue))))
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(color-highlight grub-theme-color-highlight
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(default '((fg . white) (bg . blue)))))
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(define %background-image
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(grub-image
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(aspect-ratio 4/3)
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(file #~(string-append #$%artwork-repository
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"/grub/GuixSD-fully-black-4-3.svg"))))
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(define %default-theme
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;; Default theme contributed by Felipe López.
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(grub-theme
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(images (list %background-image))
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(color-highlight '((fg . yellow) (bg . black)))
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(color-normal '((fg . light-gray) (bg . black))))) ;XXX: #x303030
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(define-record-type* <grub-configuration>
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grub-configuration make-grub-configuration
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grub-configuration?
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(grub grub-configuration-grub ; package
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(default (@ (gnu packages grub) grub)))
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(device grub-configuration-device) ; string
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(menu-entries grub-configuration-menu-entries ; list
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(default '()))
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(default-entry grub-configuration-default-entry ; integer
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(default 0))
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(timeout grub-configuration-timeout ; integer
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(default 5))
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(theme grub-configuration-theme ; <grub-theme>
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(default %default-theme)))
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(define-record-type* <menu-entry>
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menu-entry make-menu-entry
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menu-entry?
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(label menu-entry-label)
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(device menu-entry-device ; file system uuid, label, or #f
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(default #f))
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(device-mount-point menu-entry-device-mount-point
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(default "/"))
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(linux menu-entry-linux)
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(linux-arguments menu-entry-linux-arguments
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(default '())) ; list of string-valued gexps
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(initrd menu-entry-initrd)) ; file name of the initrd as a gexp
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;;;
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;;; Background image & themes.
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;;;
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(define* (svg->png svg #:key width height)
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"Build a PNG of HEIGHT x WIDTH from SVG."
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(gexp->derivation "grub-image.png"
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(with-imported-modules '((gnu build svg))
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#~(begin
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;; We need these two libraries.
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(add-to-load-path (string-append #$guile-rsvg
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"/share/guile/site/"
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(effective-version)))
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(add-to-load-path (string-append #$guile-cairo
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"/share/guile/site/"
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(effective-version)))
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(use-modules (gnu build svg))
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(svg->png #$svg #$output
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#:width #$width
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#:height #$height)))))
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(define* (grub-background-image config #:key (width 1024) (height 768))
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"Return the GRUB background image defined in CONFIG with a ratio of
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WIDTH/HEIGHT, or #f if none was found."
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(let* ((ratio (/ width height))
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(image (find (lambda (image)
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(= (grub-image-aspect-ratio image) ratio))
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(grub-theme-images (grub-configuration-theme config)))))
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(if image
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(svg->png (grub-image-file image)
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#:width width #:height height)
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(with-monad %store-monad
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(return #f)))))
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(define* (eye-candy config store-device store-mount-point
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#:key system port)
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"Return in %STORE-MONAD a gexp that writes to PORT (a port-valued gexp) the
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'grub.cfg' part concerned with graphics mode, background images, colors, and
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all that. STORE-DEVICE designates the device holding the store, and
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STORE-MOUNT-POINT is its mount point; these are used to determine where the
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background image and fonts must be searched for. SYSTEM must be the target
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system string---e.g., \"x86_64-linux\"."
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(define setup-gfxterm-body
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;; Intel and EFI systems need to be switched into graphics mode, whereas
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;; most other modern architectures have no other mode and therefore don't
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;; need to be switched.
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(if (string-match "^(x86_64|i[3-6]86)-" system)
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"
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# Leave 'gfxmode' to 'auto'.
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insmod vbe
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insmod vga
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insmod video_bochs
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insmod video_cirrus
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insmod gfxterm
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if [ \"${grub_platform}\" == efi ]; then
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# This is for (U)EFI systems (these modules are unavailable in the
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# non-EFI GRUB.) If we don't load them, GRUB boots in \"blind mode\",
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# which isn't convenient.
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insmod efi_gop
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insmod efi_uga
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fi
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terminal_output gfxterm
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"
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""))
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(define (theme-colors type)
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(let* ((theme (grub-configuration-theme config))
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(colors (type theme)))
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(string-append (symbol->string (assoc-ref colors 'fg)) "/"
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(symbol->string (assoc-ref colors 'bg)))))
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(define font-file
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(strip-mount-point store-mount-point
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(file-append grub "/share/grub/unicode.pf2")))
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(mlet* %store-monad ((image (grub-background-image config)))
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(return (and image
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#~(format #$port "
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function setup_gfxterm {~a}
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# Set 'root' to the partition that contains /gnu/store.
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~a
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if loadfont ~a; then
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setup_gfxterm
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fi
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insmod png
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if background_image ~a; then
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set color_normal=~a
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set color_highlight=~a
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else
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set menu_color_normal=cyan/blue
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set menu_color_highlight=white/blue
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fi~%"
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#$setup-gfxterm-body
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#$(grub-root-search store-device font-file)
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#$font-file
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#$(strip-mount-point store-mount-point image)
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#$(theme-colors grub-theme-color-normal)
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#$(theme-colors grub-theme-color-highlight))))))
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;;;
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;;; Configuration file.
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;;;
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(define (grub-root-search device file)
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"Return the GRUB 'search' command to look for DEVICE, which contains FILE,
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a gexp. The result is a gexp that can be inserted in the grub.cfg-generation
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code."
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;; Usually FILE is a file name gexp like "/gnu/store/…-linux/vmlinuz", but
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;; it can also be something like "(hd0,msdos1)/vmlinuz" in the case of
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;; custom menu entries. In the latter case, don't emit a 'search' command.
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(if (and (string? file) (not (string-prefix? "/" file)))
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""
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(match device
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;; Preferably refer to DEVICE by its UUID or label. This is more
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;; efficient and less ambiguous, see <>.
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((? bytevector? uuid)
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(format #f "search --fs-uuid --set ~a"
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(uuid->string device)))
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((? string? label)
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(format #f "search --label --set ~a" label))
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(#f
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#~(format #f "search --file --set ~a" #$file)))))
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(define* (grub-configuration-file config entries
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#:key
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(system (%current-system))
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(old-entries '()))
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"Return the GRUB configuration file corresponding to CONFIG, a
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<grub-configuration> object, and where the store is available at STORE-FS, a
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<file-system> object. OLD-ENTRIES is taken to be a list of menu entries
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corresponding to old generations of the system."
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(define all-entries
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(append entries (grub-configuration-menu-entries config)))
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(define entry->gexp
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(match-lambda
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(($ <menu-entry> label device device-mount-point
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linux arguments initrd)
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;; Here DEVICE is the store and DEVICE-MOUNT-POINT is its mount point.
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;; Use the right file names for LINUX and INITRD in case
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;; DEVICE-MOUNT-POINT is not "/", meaning that the store is on a
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;; separate partition.
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(let ((linux (strip-mount-point device-mount-point linux))
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(initrd (strip-mount-point device-mount-point initrd)))
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#~(format port "menuentry ~s {
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~a
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linux ~a ~a
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initrd ~a
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}~%"
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#$label
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#$(grub-root-search device linux)
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#$linux (string-join (list #$@arguments))
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#$initrd)))))
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(mlet %store-monad ((sugar (eye-candy config
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(menu-entry-device (first entries))
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(menu-entry-device-mount-point
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(first entries))
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#:system system
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#:port #~port)))
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(define builder
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#~(call-with-output-file #$output
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(lambda (port)
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(format port
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"# This file was generated from your GuixSD configuration. Any changes
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# will be lost upon reconfiguration.
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")
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#$sugar
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(format port "
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set default=~a
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set timeout=~a~%"
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#$(grub-configuration-default-entry config)
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#$(grub-configuration-timeout config))
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#$@(map entry->gexp all-entries)
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#$@(if (pair? old-entries)
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#~((format port "
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submenu \"GNU system, old configurations...\" {~%")
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#$@(map entry->gexp old-entries)
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(format port "}~%"))
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#~()))))
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(gexp->derivation "grub.cfg" builder)))
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;;; grub.scm ends here
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