diff options
Diffstat (limited to 'gnu/build/bootloader.scm')
| -rw-r--r-- | gnu/build/bootloader.scm | 56 |
1 files changed, 55 insertions, 1 deletions
diff --git a/gnu/build/bootloader.scm b/gnu/build/bootloader.scm index 9570d6dd18..498022f6db 100644 --- a/gnu/build/bootloader.scm +++ b/gnu/build/bootloader.scm @@ -18,8 +18,12 @@ ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. (define-module (gnu build bootloader) + #:use-module (guix build utils) + #:use-module (guix utils) #:use-module (ice-9 binary-ports) - #:export (write-file-on-device)) + #:use-module (ice-9 format) + #:export (write-file-on-device + install-efi-loader)) ;;; @@ -36,3 +40,53 @@ (seek output offset SEEK_SET) (put-bytevector output bv)) #:binary #t))))) + + +;;; +;;; EFI bootloader. +;;; + +(define (install-efi grub grub-config esp) + "Write a self-contained GRUB EFI loader to the mounted ESP using GRUB-CONFIG." + (let* ((system %host-type) + ;; Hard code the output location to a well-known path recognized by + ;; compliant firmware. See "3.5.1.1 Removable Media Boot Behaviour": + ;; http://www.uefi.org/sites/default/files/resources/UEFI%20Spec%202_6.pdf + (grub-mkstandalone (string-append grub "/bin/grub-mkstandalone")) + (efi-directory (string-append esp "/EFI/BOOT")) + ;; Map grub target names to boot file names. + (efi-targets (cond ((string-prefix? "x86_64" system) + '("x86_64-efi" . "BOOTX64.EFI")) + ((string-prefix? "i686" system) + '("i386-efi" . "BOOTIA32.EFI")) + ((string-prefix? "armhf" system) + '("arm-efi" . "BOOTARM.EFI")) + ((string-prefix? "aarch64" system) + '("arm64-efi" . "BOOTAA64.EFI"))))) + ;; grub-mkstandalone requires a TMPDIR to prepare the firmware image. + (setenv "TMPDIR" esp) + + (mkdir-p efi-directory) + (invoke grub-mkstandalone "-O" (car efi-targets) + "-o" (string-append efi-directory "/" + (cdr efi-targets)) + ;; Graft the configuration file onto the image. + (string-append "boot/grub/grub.cfg=" grub-config)))) + +(define (install-efi-loader grub-efi esp) + "Install in ESP directory the given GRUB-EFI bootloader. Configure it to +load the Grub bootloader located in the 'Guix_image' root partition." + (let ((grub-config "grub.cfg")) + (call-with-output-file grub-config + (lambda (port) + ;; Create a tiny configuration file telling the embedded grub where to + ;; load the real thing. XXX This is quite fragile, and can prevent + ;; the image from booting when there's more than one volume with this + ;; label present. Reproducible almost-UUIDs could reduce the risk + ;; (not eliminate it). + (format port + "insmod part_msdos~@ + search --set=root --label Guix_image~@ + configfile /boot/grub/grub.cfg~%"))) + (install-efi grub-efi grub-config esp) + (delete-file grub-config))) |