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build: bootloader: Add install-efi procedure.

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* gnu/build/bootloader.scm (install-efi): New procedure copied from (gnu build vm).
(install-efi-loader): New exported procedure, wrapping install-efi.
* gnu/build/vm.scm (initialize-hard-disk): Adapt to use install-efi-loader.
This commit is contained in:
Mathieu Othacehe 2020-04-28 16:17:59 +02:00
parent 892bbea750
commit f8fd115717
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GPG key ID: 8354763531769CA6
2 changed files with 58 additions and 17 deletions
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56
gnu/build/bootloader.scm
View file

@ -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 @@ (define (write-file-on-device file size device offset)
(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)))

19
gnu/build/vm.scm
View file

@ -27,6 +27,7 @@ (define-module (gnu build vm)
#:use-module (guix build store-copy)
#:use-module (guix build syscalls)
#:use-module (guix store database)
#:use-module (gnu build bootloader)
#:use-module (gnu build linux-boot)
#:use-module (gnu build install)
#:use-module (gnu system uuid)
@ -610,30 +611,16 @@ (define (partition-esp? partition)
(when esp
;; Mount the ESP somewhere and install GRUB UEFI image.
(let ((mount-point (string-append target "/boot/efi"))
(grub-config (string-append target "/tmp/grub-standalone.cfg")))
(let ((mount-point (string-append target "/boot/efi")))
(display "mounting EFI system partition...\n")
(mkdir-p mount-point)
(mount (partition-device esp) mount-point
(partition-file-system esp))
;; 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).
(call-with-output-file grub-config
(lambda (port)
(format port
"insmod part_msdos~@
search --set=root --label Guix_image~@
configfile /boot/grub/grub.cfg~%")))
(display "creating EFI firmware image...")
(install-efi grub-efi mount-point grub-config)
(install-efi-loader grub-efi mount-point)
(display "done.\n")
(delete-file grub-config)
(umount mount-point)))
;; Register BOOTCFG as a GC root.