Hi Daniel,
Daniel Baumann wrote:
I recently got the following bug-report in Debian, where there's a
problem that zcat from zutils doesn't implement the -t option:
https://bugs.debian.org/903931
Do you think, such an option could be added to zutils?
But the zcat from zutils does implement the -t option[1].
[1] http://www.nongnu.org/zutils/manual/zutils_manual.html#Zcat
It seems that there are two ways of implementing *zcat programs out
there. The zcat from zutils is a complete implementation of a cat
program like the one from GNU coreutils[2] but with transparent
decompression. I have invested a lot of work to make it work well.
[2]
http://www.gnu.org/software/coreutils/manual/html_node/cat-invocation.html#cat-invocation
The rest of the *zcat programs out there seem to be just wrapper
scripts. The zcat from gzip boils down to 'exec gzip -cd "$@"'.
The problem, IMO, is in the xcpio() function of unmkinitramfs. It should
use 'gzip -t' instead of 'zcat -t', just as it already uses 'bzip2 -t'
and 'lzop -t'. Think that posix zcat does not document a -t option[3]
and therefore 'zcat -t' is not a portable way to check file integrity.
[3] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/zcat.html
Best regards,
Antonio.
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