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file-systems: Use creation time if modification time is unset for ISO9660.

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* gnu/build/file-systems.scm (iso9660-superblock-uuid): Modify.
This commit is contained in:
Danny Milosavljevic 2017-06-06 10:50:37 +02:00
parent 15df12beae
commit c6aee77e29
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1 changed files with 8 additions and 2 deletions
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gnu/build/file-systems.scm
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@ -268,12 +268,18 @@ (define (read-iso9660-superblock device)
(define (iso9660-superblock-uuid sblock)
"Return the modification time of an iso9660 primary volume descriptor
SBLOCK as a bytevector."
SBLOCK as a bytevector. If that's not set, returns the creation time."
;; Drops GMT offset for compatibility with Grub, blkid and /dev/disk/by-uuid.
;; Compare Grub: "2014-12-02-19-30-23-00".
;; Compare blkid result: "2014-12-02-19-30-23-00".
;; Compare /dev/disk/by-uuid entry: "2014-12-02-19-30-23-00".
(sub-bytevector sblock 830 16))
(let* ((creation-time (sub-bytevector sblock 813 17))
(modification-time (sub-bytevector sblock 830 17))
(unset-time (make-bytevector 17 0))
(time (if (bytevector=? unset-time modification-time)
creation-time
modification-time)))
(sub-bytevector time 0 16))) ; strips GMT offset.
(define (iso9660-uuid->string uuid)
"Given an UUID bytevector, return its timestamp string."