git plugin complains of: UnboundLocalError: local variable 'rev' referenced before assignment with an empty repository

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When loading the Git plugin (for the trac .11 release) I get:

Trac detected an internal error: UnboundLocalError: local variable 'rev' referenced before assignment

If I go into the source of the TracGit module, and execute PyGit.py, I get a similar error:

draal:~/gitplugin/0.11/tracext/git$ python PyGIT.py /data/git/[scrubbed]/.git git version [{'v_tuple': (1, 5, 2, 5), 'v_min_tuple': (1, 5, 2), 'v_compatible': True, 'v_min_str': '1.5.2', 'v_str': '1.5.2.5'}] statm = (5029888, 3309568, 1613824, 1011712, 0, 1720320, 0) DATA: 0 +0 DATA: 0 +0 Traceback (most recent call last):

File "PyGIT.py", line 694, in <module>

print "[%s]" % g.head()

File "PyGIT.py", line 358, in head

return self.verifyrev("HEAD")

File "PyGIT.py", line 364, in verifyrev

db, tag_db = self.rev_cache[2:4]

File "PyGIT.py", line 269, in get_rev_cache

oldest = rev

UnboundLocalError: local variable 'rev' referenced before assignment

This was from the latest zip file that was pulled down Feb 26, 2008

Looking into the code a bit, I realized that the problem comes from PyGIT's processing of an empty repository (immediately after 'git init' and before any commits). Once I discovered this, I added a file to the repository and the problem went away.