'keystone-manage database sync' doesn't work

root@z2-auth:~# su -c "keystone-manage database sync" keystone
ERROR: you need to pass either an existing engine or a database uri
No handlers could be found for logger "keystone.manage"
Traceback (most recent call last):
  File "/usr/bin/keystone-manage", line 24, in <module>
    keystone.manage.main()
  File "/usr/lib/python2.6/dist-packages/keystone/manage/__init__.py", line 485, in main
    process(*parse_args(args))
  File "/usr/lib/python2.6/dist-packages/keystone/manage/__init__.py", line 311, in process
    args)
  File "/usr/lib/python2.6/dist-packages/keystone/manage/__init__.py", line 424, in do_db_sync
    migration.db_sync(options, version=db_version)
  File "/usr/lib/python2.6/dist-packages/keystone/backends/sqlalchemy/migration.py", line 168, in db_sync
    _version_control(sql_connection)
  File "/usr/lib/python2.6/dist-packages/keystone/backends/sqlalchemy/migration.py", line 157, in _version_control
    return versioning_api.version_control(sql_connection, repo_path)
  File "<string>", line 2, in version_control
  File "/usr/local/lib/python2.6/dist-packages/migrate/versioning/util/__init__.py", line 155, in with_engine
    engine = construct_engine(url, **kw)
  File "/usr/local/lib/python2.6/dist-packages/migrate/versioning/util/__init__.py", line 116, in construct_engine
    raise ValueError("you need to pass either an existing engine or a database uri")
ValueError: you need to pass either an existing engine or a database uri

When looking into things, we seem to be passing the entire "options" array to the migrate library...but it only seems to need the 'sql_connection' part of options.