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image: Add a post-MBR gap to the default image.

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The generic 'efi-disk-image' needs to be bootable on systems without EFI. To
do that, GRUB is installed in the post-MBR gap. Make sure that the first
partition starts with an offset, to make this gap large enough for GRUB.

* gnu/system/image.scm (root-offset, root-label): New variables,
(esp-partition): use 'root-offset' as the partition offset,
(root-partition): use 'root-label' as the partition label.
This commit is contained in:
Mathieu Othacehe 2020-05-29 09:05:53 +02:00
parent 749381051d
commit b7b45372e7
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1 changed files with 9 additions and 1 deletions
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10
gnu/system/image.scm
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@ -65,9 +65,17 @@ (define-module (gnu system image)
;;; Images definitions.
;;;
;; This is the offset before the first partition. GRUB will install itself in
;; this post-MBR gap.
(define root-offset (* 512 2048))
;; Generic root partition label.
(define root-label "Guix_image")
(define esp-partition
(partition
(size (* 40 (expt 2 20)))
(offset root-offset)
(label "GNU-ESP") ;cosmetic only
;; Use "vfat" here since this property is used when mounting. The actual
;; FAT-ness is based on file system size (16 in this case).
@ -78,7 +86,7 @@ (define esp-partition
(define root-partition
(partition
(size 'guess)
(label "Guix_image")
(label root-label)
(file-system "ext4")
(flags '(boot))
(initializer (gexp initialize-root-partition))))