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“xzdiff a.xz b.xz” always fails 

Attempts to compare two compressed files result in no output and
exit status 2.

Instead of going to standard output, ‘diff’ output is being
captured in the xz_status variable along with the exit status from
the decompression commands.  Later, when this variable is examined
for nonzero status codes, numerals from dates in the ‘diff’ output
make it appear as though decompression failed.

So let the ‘diff’ output leak to standard output with another file
descriptor.  (This trick is used in all similar contexts elsewhere
in xzdiff and in the analogous context in gzip’s zdiff script.)
This commit is contained in:
Jonathan Nieder 2009-08-09 13:41:20 -05:00 committed by Lasse Collin
parent 1d314b81aa
commit e71903fc61
1 changed files with 1 additions and 1 deletions
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2
src/scripts/xzdiff.in
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@ -118,7 +118,7 @@ elif test $# -eq 2; then
exec 4>&1 exec 4>&1
($xz1 -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- | ($xz1 -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
( ($xz2 -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null | ( ($xz2 -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
eval "$cmp" /dev/fd/5 -) 5<&0 eval "$cmp" /dev/fd/5 - >&3) 5<&0
) )
case $xz_status in case $xz_status in
*[1-9]*) xz_status=1;; *[1-9]*) xz_status=1;;