diff options
| -rw-r--r-- | gnu/build/file-systems.scm | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm index 3b831c0ec0..3e0873377a 100644 --- a/gnu/build/file-systems.scm +++ b/gnu/build/file-systems.scm @@ -245,7 +245,12 @@ Trailing spaces are trimmed." "Find and read the first primary volume descriptor, starting at OFFSET. Return #f if not found." (let* ((sblock (read-superblock device offset 2048 iso9660-superblock?)) - (type-code (if sblock (array-ref sblock 0) 255))) + (type-code (if sblock + (bytevector-u8-ref sblock 0) + (error (format #f + "Could not read ISO9660 primary +volume descriptor from ~s" + device))))) (match type-code (255 #f) ; Volume Descriptor Set Terminator. (1 sblock) ; Primary Volume Descriptor |