Re: bad object

From: J. Bruce Fields <bfields@fieldses.org>
Date: Apr 22, 2009, 21:00 UTC
Message-ID: <20090422210001.GI9541@fieldses.org>
In-Reply-To: <7vbpqo31fx.fsf@gitster.siamese.dyndns.org>

On Wed, Apr 22, 2009 at 12:58:42PM -0700, Junio C Hamano wrote:

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> "J. Bruce Fields" <bfields@fieldses.org> writes:
> 
> > Just today operations started warning:
> >
> > 	error: Could not read 4e69489a0ac11a9b62a25923975bfc370a30eae5
> >
> > This is Documentation/networking/baycom.txt from
> > 518e6540831c69422faecceee8f964bd439ac9d0 (pre-2.6.13), which is easy
> > enough to find from another repository and fix the problem.
> >
> > But I'm curious--how do I find out what pack file that object should be
> > in, and what the corruption looks like?
> 
> The former you should be able to read from either "verify-pack -v" or
> "show-index" output.

Thanks.  So:

bfields@pig:~/local/linux-2.6$ git verify-pack -v .git/objects/pack/pack-691dbdb94f881bc07a0befa45f288466bde6207b error: Packfile index for .git/objects/pack/pack-691dbdb94f881bc07a0befa45f288466bde6207b.pack SHA1 mismatch error: packed 000000e0199ffeffffffd143feffd143feff00c0 from .git/objects/pack/pack-691dbdb94f881bc07a0befa45f288466bde6207b.pack is corrupt .git/objects/pack/pack-691dbdb94f881bc07a0befa45f288466bde6207b.pack: bad

I don't have another copy of the pack 691dbdb94.... I guess I could run git-unpack-objects and see what it produces for the bad blob?

--b.

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> After finding the offset for the object data in the
> pack, a bit of "dd seek=" would be needed to extract the data.
> 
> >
> > This is the third time I've found corruption in a repository on this
> > laptop, so I'm a little suspicious of the hardware.  (The second time I
> > reported here: http://marc.info/?l=git&m=121968278319668&w=2.)
> >
> > --b.