Repairing a repository with a checksum error

[Ian Rowlands <Ia...@sro.vic.gov.au>]

I was attempting to do a dump of our repository (about to upgrade) and
received the following error:

svnadmin: Checksum mismatch while reading representation:
   expected:  b8a416747c932902932a95880e740d78
     actual:  7a0665c5b480601e0c9c0c4a5bfdab49

This wasn't in the latest revision (9318 of a repository containing 9900+
revisions).

How do I fix this problem so I can dump the repository in preparation for
importing to a newer version of Subversion? I'm currently running 1.2.3
with the FSFS.


Regards,

Ian Rowlands
_________________________________________
Software Developer
State Revenue Office Victoria
Phone : (03) 9628-0185
Email : ian.rowlands@sro.vic.gov.au



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Re: Repairing a repository with a checksum error

[John Szakmeister <jo...@szakmeister.net>]

----- Ian Rowlands <Ia...@sro.vic.gov.au> wrote:
> I was attempting to do a dump of our repository (about to upgrade) and
> received the following error:
> 
> svnadmin: Checksum mismatch while reading representation:
>    expected:  b8a416747c932902932a95880e740d78
>      actual:  7a0665c5b480601e0c9c0c4a5bfdab49
> 
> This wasn't in the latest revision (9318 of a repository containing 9900+
> revisions).
> 
> How do I fix this problem so I can dump the repository in preparation for
> importing to a newer version of Subversion? I'm currently running 1.2.3
> with the FSFS.

Make a backup of the repository.  Then, open db/revs/9318 and search for 'b8a416747c932902932a95880e740d78'.  Then change 'b8a416747c932902932a95880e740d78' to '00000000000000000000000000000000' (that is a string of ASCII zeros of the exact same length as the original checksum).  Save it.  Then try running svnadmin dump again.

FYI, the all zeros checksum is a wildcard that will match any checksum.  You should try to at least verify that the contents are valid.  You should also run 'svnadmin verify' against your repository to help catch these errors sooner.

Hope that helps!  If you have trouble, let me know.  I can help walk you through this a little more.

-John

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