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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) | |
f8fd1157 MO |
21 | #:use-module (guix build utils) |
22 | #:use-module (guix utils) | |
e2248203 | 23 | #:use-module (ice-9 binary-ports) |
f8fd1157 | 24 | #:use-module (ice-9 format) |
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25 | #:use-module (rnrs io ports) |
26 | #:use-module (rnrs io simple) | |
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27 | #:export (write-file-on-device |
28 | install-efi-loader)) | |
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29 | |
30 | \f | |
31 | ;;; | |
32 | ;;; Writing utils. | |
33 | ;;; | |
34 | ||
35 | (define (write-file-on-device file size device offset) | |
36 | "Write SIZE bytes from FILE to DEVICE starting at OFFSET." | |
37 | (call-with-input-file file | |
38 | (lambda (input) | |
39 | (let ((bv (get-bytevector-n input size))) | |
b97b423e | 40 | (call-with-port |
a38d861e | 41 | ;; Do not use "call-with-output-file" that would truncate the file. |
b97b423e | 42 | (open-file-output-port device |
a38d861e | 43 | (file-options no-truncate no-fail) |
b97b423e | 44 | (buffer-mode block) |
a38d861e MO |
45 | ;; Use the binary-friendly ISO-8859-1 |
46 | ;; encoding. | |
47 | (make-transcoder (latin-1-codec))) | |
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48 | (lambda (output) |
49 | (seek output offset SEEK_SET) | |
50 | (put-bytevector output bv))))))) | |
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51 | |
52 | \f | |
53 | ;;; | |
54 | ;;; EFI bootloader. | |
55 | ;;; | |
56 | ||
57 | (define (install-efi grub grub-config esp) | |
58 | "Write a self-contained GRUB EFI loader to the mounted ESP using GRUB-CONFIG." | |
59 | (let* ((system %host-type) | |
60 | ;; Hard code the output location to a well-known path recognized by | |
61 | ;; compliant firmware. See "3.5.1.1 Removable Media Boot Behaviour": | |
62 | ;; http://www.uefi.org/sites/default/files/resources/UEFI%20Spec%202_6.pdf | |
63 | (grub-mkstandalone (string-append grub "/bin/grub-mkstandalone")) | |
64 | (efi-directory (string-append esp "/EFI/BOOT")) | |
65 | ;; Map grub target names to boot file names. | |
66 | (efi-targets (cond ((string-prefix? "x86_64" system) | |
67 | '("x86_64-efi" . "BOOTX64.EFI")) | |
68 | ((string-prefix? "i686" system) | |
69 | '("i386-efi" . "BOOTIA32.EFI")) | |
70 | ((string-prefix? "armhf" system) | |
71 | '("arm-efi" . "BOOTARM.EFI")) | |
72 | ((string-prefix? "aarch64" system) | |
73 | '("arm64-efi" . "BOOTAA64.EFI"))))) | |
74 | ;; grub-mkstandalone requires a TMPDIR to prepare the firmware image. | |
75 | (setenv "TMPDIR" esp) | |
76 | ||
77 | (mkdir-p efi-directory) | |
78 | (invoke grub-mkstandalone "-O" (car efi-targets) | |
79 | "-o" (string-append efi-directory "/" | |
80 | (cdr efi-targets)) | |
81 | ;; Graft the configuration file onto the image. | |
82 | (string-append "boot/grub/grub.cfg=" grub-config)))) | |
83 | ||
84 | (define (install-efi-loader grub-efi esp) | |
85 | "Install in ESP directory the given GRUB-EFI bootloader. Configure it to | |
86 | load the Grub bootloader located in the 'Guix_image' root partition." | |
87 | (let ((grub-config "grub.cfg")) | |
88 | (call-with-output-file grub-config | |
89 | (lambda (port) | |
90 | ;; Create a tiny configuration file telling the embedded grub where to | |
91 | ;; load the real thing. XXX This is quite fragile, and can prevent | |
92 | ;; the image from booting when there's more than one volume with this | |
93 | ;; label present. Reproducible almost-UUIDs could reduce the risk | |
94 | ;; (not eliminate it). | |
95 | (format port | |
96 | "insmod part_msdos~@ | |
97 | search --set=root --label Guix_image~@ | |
98 | configfile /boot/grub/grub.cfg~%"))) | |
99 | (install-efi grub-efi grub-config esp) | |
100 | (delete-file grub-config))) |