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[Jeroen Vermeulen <jtv@xxxxxxxxxxxxx>]

When I try to run certain tests, I get this error:

TacException: Unable to start [...branch...]/daemons/buildd-slave.tac. 
Check /var/tmp/buildd/build-slave.log.
This exception is raised by TacTestSetup.setUp in 
lib/canonical/launchpad/daemons/tachandler.py.  Right below that is 
tearDown which deletes that very log file.  And then for good measure, 
the tearDown in BuilddSlaveTestSetup removes the entire directory that 
the log file is in.  Good show for not leaving garbage behind, but in 
this case a damned nuisance!
In my case, the trigger seems to be that the buildd-slave daemon is 
already running.  Is there some way we can get this information out?
For instance, in case of failure we could copy the log file to some 
fixed place outside /var/tmp/buildd.  As long as it's always writing to 
the same filename, at least the garbage will be limited to 1 file.

Jeroen