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file-systems: Improve error handling in the iso9660 case - fixes boot problem.

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* gnu/build/file-systems.scm (read-iso9660-superblock): Modify.
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Danny Milosavljevic 2017-06-03 19:55:57 +02:00
parent b92e8da0a8
commit fb03f44bb1
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1 changed files with 5 additions and 1 deletions
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6
gnu/build/file-systems.scm
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@ -260,7 +260,11 @@ (define (read-iso9660-superblock device)
"Return the raw contents of DEVICE's iso9660 primary volume descriptor
as a bytevector, or #f if DEVICE does not contain an iso9660 file system."
;; Start reading at sector 16.
(read-iso9660-primary-volume-descriptor device (* 2048 16)))
;; Since we are not sure that the device contains an ISO9660 filesystem,
;; we have to find that out first.
(if (read-superblock device (* 2048 16) 2048 iso9660-superblock?)
(read-iso9660-primary-volume-descriptor device (* 2048 16))
#f)) ; Device does not contain an iso9660 filesystem.
(define (iso9660-superblock-uuid sblock)
"Return the modification time of an iso9660 primary volume descriptor