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-rw-r--r--gnu/build/file-systems.scm10
1 files changed, 8 insertions, 2 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index 10be0dc83c..7737de3d03 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -268,12 +268,18 @@ as a bytevector, or #f if DEVICE does not contain an iso9660 file system."
(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."