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ystem %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 (or 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 #:key targets) "Install in ESP directory the given GRUB-EFI bootloader. Configure it to load the Grub bootloader located in the 'Guix_image' root partition. If TARGETS is set, use its car as the GRUB image format and its cdr as the output filename. Otherwise, use defaults for the host platform." (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~@ insmod part_gpt~@ search --set=root --label Guix_image~@ configfile /boot/grub/grub.cfg~%"))) (install-efi grub-efi grub-config esp #:targets targets) (delete-file grub-config)))