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gnu: build: Improve docstrings.

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* gnu/build/file-systems.scm (iso9660-superblock?,
read-iso9660-superblock, iso9660-superblock-uuid): Improve docstrings.
This commit is contained in:
Danny Milosavljevic 2017-05-27 12:33:08 +02:00
parent dc443f5149
commit 3dba9b3782
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1 changed files with 5 additions and 4 deletions
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gnu/build/file-systems.scm
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@ -236,7 +236,7 @@ Trailing spaces are trimmed."
;; <http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-119.pdf>.
(define (iso9660-superblock? sblock)
"Return #t when SBLOCK is a iso9660 superblock."
"Return #t when SBLOCK is an iso9660 volume descriptor."
(bytevector=? (sub-bytevector sblock 1 6)
;; Note: "\x01" is the volume descriptor format version
(string->utf8 "CD001\x01")))
@ -252,13 +252,14 @@ Trailing spaces are trimmed."
(_ (read-iso9660-primary-volume-descriptor device (+ offset 2048))))))
(define (read-iso9660-superblock device)
"Return the raw contents of DEVICE's iso9660 superblock as a bytevector, or
#f if DEVICE does not contain a iso9660 file system."
"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)))
(define (iso9660-superblock-uuid sblock)
"Return the modification time of a iso9660 superblock SBLOCK as a bytevector."
"Return the modification time of an iso9660 primary volume descriptor
SBLOCK as a bytevector."
;; 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".