From owner-freebsd-stable@FreeBSD.ORG  Thu Jan 10 23:13:53 2008
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From: "Steven Hartland" <killing@multiplay.co.uk>
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Date: Thu, 10 Jan 2008 22:58:33 -0000
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Subject: FreeBSD tar errors on valid empty tar.gz
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Seems our current libarchive? That support FreeBSD's tar implementation has
a bug where it can create archives it cant read back. This can be seen
by simply creating an empty tar.gz file and then trying to expand or
list it.

In doing the above you get the following error:
tar: Unrecognized archive format: Inappropriate file type or format

N.B. gtar can list and expand the created file without issue.

    Regards
    Steve

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