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vm: Allow partitions to be initialized with a given UUID.

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* gnu/build/vm.scm (<partition>)[uuid]: New field.
(create-ext-file-system): Add #:uuid and honor it.
(create-fat-file-system): Add #:uuid.
(format-partition): Add #:uuid and honor it.
(initialize-partition): Honor the 'uuid' field of PARTITION.
This commit is contained in:
Ludovic Courtès 2017-07-20 00:15:43 +02:00
parent 007b92cfc0
commit bae28ccb69
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1 changed files with 16 additions and 10 deletions
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26
gnu/build/vm.scm
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@ -163,6 +163,7 @@ the #:references-graphs parameter of 'derivation'."
(size partition-size)
(file-system partition-file-system (default "ext4"))
(label partition-label (default #f))
(uuid partition-uuid (default #f))
(flags partition-flags (default '()))
(initializer partition-initializer (default (const #t))))
@ -236,22 +237,26 @@ actual /dev name based on DEVICE."
(define MS_BIND 4096) ; <sys/mounts.h> again!
(define* (create-ext-file-system partition type
#:key label)
#:key label uuid)
"Create an ext-family filesystem of TYPE on PARTITION. If LABEL is true,
use that as the volume name."
use that as the volume name. If UUID is true, use it as the partition UUID."
(format #t "creating ~a partition...\n" type)
(unless (zero? (apply system* (string-append "mkfs." type)
"-F" partition
(if label
`("-L" ,label)
'())))
`(,@(if label
`("-L" ,label)
'())
,@(if uuid
`("-U" ,(uuid->string uuid))
'()))))
(error "failed to create partition")))
(define* (create-fat-file-system partition
#:key label)
#:key label uuid)
"Create a FAT filesystem on PARTITION. The number of File Allocation Tables
will be determined based on filesystem size. If LABEL is true, use that as the
volume name."
;; FIXME: UUID is ignored!
(format #t "creating FAT partition...\n")
(unless (zero? (apply system* "mkfs.fat" partition
(if label
@ -260,13 +265,13 @@ volume name."
(error "failed to create FAT partition")))
(define* (format-partition partition type
#:key label)
#:key label uuid)
"Create a file system TYPE on PARTITION. If LABEL is true, use that as the
volume name."
(cond ((string-prefix? "ext" type)
(create-ext-file-system partition type #:label label))
(create-ext-file-system partition type #:label label #:uuid uuid))
((or (string-prefix? "fat" type) (string= "vfat" type))
(create-fat-file-system partition #:label label))
(create-fat-file-system partition #:label label #:uuid uuid))
(else (error "Unsupported file system."))))
(define (initialize-partition partition)
@ -275,7 +280,8 @@ it, run its initializer, and unmount it."
(let ((target "/fs"))
(format-partition (partition-device partition)
(partition-file-system partition)
#:label (partition-label partition))
#:label (partition-label partition)
#:uuid (partition-uuid partition))
(mkdir-p target)
(mount (partition-device partition) target
(partition-file-system partition))