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Debilitating "Checksum Mismatch" Errors

From: P. Michael Hutchins <pmh0232_at_draper.com>
Date: 2006-08-31 22:49:51 CEST

I'm working on a large, multi-contractor project, for which an
administrator set up a svn server.

Almost every time I try to do an svn update, it fails due to a checksum
..eg: Error: Checksum mismatch for [snip] updates.log'; expected:
'05d99cf6749910c077d723f6de01816d', actual:

The only thing I've found that will enable me to proceed is to delete
either the file that's mentioned..
(in my ~sandbox~)
(I was gonna say the "offending" file, but I don't understand the error
message well enf to know whether it's referring to a file on the server
or my local copy.)

..or the whole folder it's in.

...which is annoying, disruptive - and takes a good while ... to
download lotsa files all over again.

Our task leader doesn't have this problem, for some reason - but
everyone else here does - to the point that they gave up trying to use
svn long ago -- and similarly for many at the other contractors.

I've spent vast quantities of time trying to research what the problem
might be - only to have to give up, due to the enormous number of Google
hits on this: Clearly, this is a huge problem with svn.

I give very very little credence to notions of cosmic rays, network
errors, file corruption, etc. as possible causes for this problem -
especially since one of us alleges to not have these problems.

So all I can do is beseech you to advise me/us how to track down what's
going wrong, & get it fixed.

Is it possible that people can write files to the server in (extra-svn,
maybe) ways that would cause this?
That's what seems most likely to me.

Can a user say "I could not care less about what you think the checksums
should be - and I certainly don't want the update I requested to be
disrupted by such checks."? I would in a heartbeat.

Thank you,

  -- M.

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Received on Fri Sep 1 17:14:47 2006

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