Date: Mon, 26 Sep 2005 15:58:07 -0400 From: Ed Maste <emaste@phaedrus.sandvine.ca> To: freebsd-current@freebsd.org Subject: Bsdtar and archive torture tests Message-ID: <20050926195807.GD95971@sandvine.com>
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In 16.11 "Backup Basics" the handbook mentions a paper by Elizabeth D. Zwicky and presented at LISA V in 1991. She tested a number of archive and backup programs, including GNU tar and other tar implementations, and dump/restore. I've found that she's presented an updated version of the paper at LISA XVII in 2003[1]. I ran the set of testcases she developed against gtar and bsdtar, after deleting the "holes" subdirectory. (The test included a sparse file with a 0.5TB hole. Without support for sparse files, bsdtar quickly filled my disk so I didn't bother with those tests.) To run the test, I did cd /d2/archive_test/original tar -cf /d2/archive_test/bsdtar.tar . cd /d2/archive_test/bsdtar_recovered tar -xpf /d2/archive_test/bsdtar.tar perl dircmp.pl original bsdtar_recovered | less The dircmp.pl script produced more than 60000 lines of the form Symlink target changed from ../longfilenames/84<C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3> <A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0> <C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0><C3><A0> to ../longfilenames/84<E0><E0><E0><E0><E0> <E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0><E0> <E0> as well as some other issues. It appears that all of the "symlink target changed" cases have both a long name and some high-bit characters. I haven't had any time to look into what might cause this, but just wanted to mention the availability of these testcases and some initial results. For reference, gtar runs into a few issues with long names, but doesn't change symlink targets. [1] http://www.usenix.org/events/lisa03/tech/full_papers/zwicky/zwicky_html/index.html -- Ed Maste, Sandvine Incorporated
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