Date: Fri, 9 Dec 2005 11:27:27 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Dan Nelson" <dnelson@allantgroup.com>, "Brian Fundakowski Feldman" <green@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: bsdtar / libarchive bug? Message-ID: <002901c5fcb3$8b7fc800$b3db87d4@multiplay.co.uk> References: <00c701c5fc1c$e6db4220$b3db87d4@multiplay.co.uk><20051208225404.GF98704@green.homeunix.org> <20051208234540.GB95420@dan.emsphone.com>
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----- Original Message -----
From: "Dan Nelson" <dnelson@allantgroup.com>
> I managed to make it create 0-byte files:
>
> $ touch a
> $ tar cvf b.tar --exclude a a
> $ tar zcvf b.tar.gz --exclude a a
> $ ls -la b.tar*
> -rw-r--r-- 1 dan wheel 0 Dec 8 17:37 b.tar
> -rw-r--r-- 1 dan wheel 20 Dec 8 17:37 b.tar.gz
> $ gunzip -vl b.tar.gz
> method crc date time compressed uncompr. ratio uncompressed_name
> defla 00000000 Dec 8 17:37 20 0 0.0% b.tar
>
> This works because at the time tar creates the output file, it doesn't
> know that I have excluded all the listed files.
>
> I am leaning towards an empty archive being legal, though, since it
> makes scripting easier. There may be cases where you are archiving
> files generated daily, and you want to distinguish "no data today" from
> "the archiver didn't run". At worst it should print a warning.
That's the reason here as well. It was a scripted process where we
create a tar.gz of new / changed files and a shell script to remove
old files. As some files had been removed only in this instance we
ended up with a script file with entries but nothing in the tar.gz which
then barfed on "install".
Steve
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