bzr-git, tdb and sqlite

[Jelmer Vernooij]

Hi Russel,

On Sat, Apr 03, 2010 at 09:05:05AM +0100, Russel Winder wrote:
> I had thought that bzr-svn and bzr-git would use TDB if it were
> installed and fall back to SQLite if TDB were not installed and SQLite
> was (which it always is for any Python installation).

> However for a while now all my bzr-git jobs have been failing with
> messages such as:

> bzr: failed to report crash using apport:
>      OSError(17, 'File exists')
> bzr: ERROR: exceptions.ImportError: Unable to open existing bzr-git
> cache because 'tdb' is not installed.

> I have both TDB and SQLite caches for each of the Subversion and Git
> repositories I am tracking using Bazaar because I have a filestore that
> is in effect shared between a machine with NFS mounted filestore and no
> TDB and a machine with local filestore that uses TDB.

> Is this a "known issue" or do I need to submit a bug report to
> Launchpad.

I have recently been working on improving the infrastructure for using
caches in bzr-git. One of the consequences of this is that it will
always try to open the existing cache file that is present and uses a
single cache file, rather than whatever it can manage to open.

You're seeing this error because it's trying to move the cache to a
single location and failing because there's two caches (tdb and
sqlite) it is trying to move to that single location. I wonder what
the best course of action is in that situation, but giving an obscure
error message certainly isn't the right approach.

This is all happening in preparation of a new cache format that is
based on Bazaar pack files, should be faster *and* concurrently accessible 
*and* NFS friendly.

Cheers,

Jelmer
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