93 lines
3.8 KiB
Scheme
93 lines
3.8 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
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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 build bootloader)
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#:use-module (guix build utils)
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#:use-module (guix utils)
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#:use-module (ice-9 binary-ports)
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#:use-module (ice-9 format)
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#:export (write-file-on-device
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install-efi-loader))
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;;;
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;;; Writing utils.
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;;;
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(define (write-file-on-device file size device offset)
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"Write SIZE bytes from FILE to DEVICE starting at OFFSET."
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(call-with-input-file file
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(lambda (input)
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(let ((bv (get-bytevector-n input size)))
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(call-with-output-file device
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(lambda (output)
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(seek output offset SEEK_SET)
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(put-bytevector output bv))
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#:binary #t)))))
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;;;
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;;; EFI bootloader.
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;;;
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(define (install-efi grub grub-config esp)
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"Write a self-contained GRUB EFI loader to the mounted ESP using GRUB-CONFIG."
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(let* ((system %host-type)
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;; Hard code the output location to a well-known path recognized by
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;; compliant firmware. See "3.5.1.1 Removable Media Boot Behaviour":
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;; http://www.uefi.org/sites/default/files/resources/UEFI%20Spec%202_6.pdf
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(grub-mkstandalone (string-append grub "/bin/grub-mkstandalone"))
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(efi-directory (string-append esp "/EFI/BOOT"))
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;; Map grub target names to boot file names.
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(efi-targets (cond ((string-prefix? "x86_64" system)
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'("x86_64-efi" . "BOOTX64.EFI"))
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((string-prefix? "i686" system)
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'("i386-efi" . "BOOTIA32.EFI"))
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((string-prefix? "armhf" system)
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'("arm-efi" . "BOOTARM.EFI"))
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((string-prefix? "aarch64" system)
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'("arm64-efi" . "BOOTAA64.EFI")))))
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;; grub-mkstandalone requires a TMPDIR to prepare the firmware image.
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(setenv "TMPDIR" esp)
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(mkdir-p efi-directory)
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(invoke grub-mkstandalone "-O" (car efi-targets)
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"-o" (string-append efi-directory "/"
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(cdr efi-targets))
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;; Graft the configuration file onto the image.
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(string-append "boot/grub/grub.cfg=" grub-config))))
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(define (install-efi-loader grub-efi esp)
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"Install in ESP directory the given GRUB-EFI bootloader. Configure it to
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load the Grub bootloader located in the 'Guix_image' root partition."
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(let ((grub-config "grub.cfg"))
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(call-with-output-file grub-config
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(lambda (port)
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;; Create a tiny configuration file telling the embedded grub where to
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;; load the real thing. XXX This is quite fragile, and can prevent
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;; the image from booting when there's more than one volume with this
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;; label present. Reproducible almost-UUIDs could reduce the risk
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;; (not eliminate it).
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(format port
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"insmod part_msdos~@
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search --set=root --label Guix_image~@
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configfile /boot/grub/grub.cfg~%")))
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(install-efi grub-efi grub-config esp)
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(delete-file grub-config)))
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