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Asked: 2026-05-10T19:03:26+00:00

We’ve been using Trac for task/defect tracking and things were going well enough, but

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We’ve been using Trac for task/defect tracking and things were going well enough, but this morning it started serving up a 500 error. Looking in the Apache error_log, I get a stack trace that culminates in:

 PythonHandler trac.web.modpython_frontend:   ExtractionError: Can't extract file(s) to egg cache  The following error occurred while trying to extract file(s) to the Python egg cache:    [Errno 13] Permission denied: '/.python-eggs'  The Python egg cache directory is currently set to:    /.python-eggs  Perhaps your account does not have write access to this directory?  You can change the cache directory by setting the PYTHON_EGG_CACHE environment variable to point to an accessible directory

So I explicitly set PYTHON_EGG_CACHE to /srv/trac/plugin-cache. I restarted Apache. Yet I get the same error (it still says ‘egg cache directory current set to: \n\n /.python_eggs.’)

How should I proceed? Is the simplest thing to do to reinstall Trac? If I go that route, what steps do I need to take to ensure that I don’t lose existing data?

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  1. That should be fixed in 0.11 according to their bug tracking system.

    If that’s not the case you should try to pass the environment var to apache, since doing a SetEnv in the configuration file doesn’t work. Adding something like 

    export PYTHON_EGG_CACHE=/tmp/python_eggs

    to the script you use to start apache should work.

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