Comment 3 for bug 614404

In talking over this with Aaron on IRC, I think a fix like this would be reasonable:
=== modified file 'bzrlib/repository.py'
--- bzrlib/repository.py 2010-05-25 17:27:52 +0000
+++ bzrlib/repository.py 2010-08-06 19:11:55 +0000
@@ -242,7 +242,7 @@

     def _gen_revision_id(self):
         """Return new revision-id."""
- return generate_ids.gen_revision_id(self._config.username(),
+ return generate_ids.gen_revision_id(self._committer,
                                             self._timestamp)

     def _generate_revision_if_needed(self):

self._committer is already set to self._config.username() if one is not supplied, and this way if one *is* specified then it gets used.