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1 | ;;; GNU Guix --- Functional package management for GNU |
2 | ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> | |
f0cc5e7e | 3 | ;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org> |
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4 | ;;; |
5 | ;;; This file is part of GNU Guix. | |
6 | ;;; | |
7 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
8 | ;;; under the terms of the GNU General Public License as published by | |
9 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
10 | ;;; your option) any later version. | |
11 | ;;; | |
12 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
13 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ;;; GNU General Public License for more details. | |
16 | ;;; | |
17 | ;;; You should have received a copy of the GNU General Public License | |
18 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
19 | ||
20 | (define-module (gnu build bootloader) | |
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21 | #:use-module (guix build utils) |
22 | #:use-module (guix utils) | |
e2248203 | 23 | #:use-module (ice-9 binary-ports) |
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24 | #:use-module (ice-9 format) |
25 | #:export (write-file-on-device | |
26 | install-efi-loader)) | |
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27 | |
28 | \f | |
29 | ;;; | |
30 | ;;; Writing utils. | |
31 | ;;; | |
32 | ||
33 | (define (write-file-on-device file size device offset) | |
34 | "Write SIZE bytes from FILE to DEVICE starting at OFFSET." | |
35 | (call-with-input-file file | |
36 | (lambda (input) | |
37 | (let ((bv (get-bytevector-n input size))) | |
38 | (call-with-output-file device | |
39 | (lambda (output) | |
40 | (seek output offset SEEK_SET) | |
41 | (put-bytevector output bv)) | |
42 | #:binary #t))))) | |
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43 | |
44 | \f | |
45 | ;;; | |
46 | ;;; EFI bootloader. | |
47 | ;;; | |
48 | ||
49 | (define (install-efi grub grub-config esp) | |
50 | "Write a self-contained GRUB EFI loader to the mounted ESP using GRUB-CONFIG." | |
51 | (let* ((system %host-type) | |
52 | ;; Hard code the output location to a well-known path recognized by | |
53 | ;; compliant firmware. See "3.5.1.1 Removable Media Boot Behaviour": | |
54 | ;; http://www.uefi.org/sites/default/files/resources/UEFI%20Spec%202_6.pdf | |
55 | (grub-mkstandalone (string-append grub "/bin/grub-mkstandalone")) | |
56 | (efi-directory (string-append esp "/EFI/BOOT")) | |
57 | ;; Map grub target names to boot file names. | |
58 | (efi-targets (cond ((string-prefix? "x86_64" system) | |
59 | '("x86_64-efi" . "BOOTX64.EFI")) | |
60 | ((string-prefix? "i686" system) | |
61 | '("i386-efi" . "BOOTIA32.EFI")) | |
62 | ((string-prefix? "armhf" system) | |
63 | '("arm-efi" . "BOOTARM.EFI")) | |
64 | ((string-prefix? "aarch64" system) | |
65 | '("arm64-efi" . "BOOTAA64.EFI"))))) | |
66 | ;; grub-mkstandalone requires a TMPDIR to prepare the firmware image. | |
67 | (setenv "TMPDIR" esp) | |
68 | ||
69 | (mkdir-p efi-directory) | |
70 | (invoke grub-mkstandalone "-O" (car efi-targets) | |
71 | "-o" (string-append efi-directory "/" | |
72 | (cdr efi-targets)) | |
73 | ;; Graft the configuration file onto the image. | |
74 | (string-append "boot/grub/grub.cfg=" grub-config)))) | |
75 | ||
76 | (define (install-efi-loader grub-efi esp) | |
77 | "Install in ESP directory the given GRUB-EFI bootloader. Configure it to | |
78 | load the Grub bootloader located in the 'Guix_image' root partition." | |
79 | (let ((grub-config "grub.cfg")) | |
80 | (call-with-output-file grub-config | |
81 | (lambda (port) | |
82 | ;; Create a tiny configuration file telling the embedded grub where to | |
83 | ;; load the real thing. XXX This is quite fragile, and can prevent | |
84 | ;; the image from booting when there's more than one volume with this | |
85 | ;; label present. Reproducible almost-UUIDs could reduce the risk | |
86 | ;; (not eliminate it). | |
87 | (format port | |
88 | "insmod part_msdos~@ | |
89 | search --set=root --label Guix_image~@ | |
90 | configfile /boot/grub/grub.cfg~%"))) | |
91 | (install-efi grub-efi grub-config esp) | |
92 | (delete-file grub-config))) |