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# Copyright 2010 United States Government as represented by the 

# Administrator of the National Aeronautics and Space Administration. 

# All Rights Reserved. 

# 

#    Licensed under the Apache License, Version 2.0 (the "License"); you may 

#    not use this file except in compliance with the License. You may obtain 

#    a copy of the License at 

# 

#         http://www.apache.org/licenses/LICENSE-2.0 

# 

#    Unless required by applicable law or agreed to in writing, software 

#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 

#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 

#    License for the specific language governing permissions and limitations 

#    under the License. 

 

"""Database setup and migration commands.""" 

 

from oslo_config import cfg 

from stevedore import driver 

 

_IMPL = None 

 

 

def get_backend(): 

    global _IMPL 

    if not _IMPL: 

        cfg.CONF.import_opt('backend', 'oslo_db.options', group='database') 

        _IMPL = driver.DriverManager("magnum.database.migration_backend", 

                                     cfg.CONF.database.backend).driver 

    return _IMPL 

 

 

def upgrade(version=None): 

    """Migrate the database to `version` or the most recent version.""" 

    return get_backend().upgrade(version) 

 

 

def version(): 

    return get_backend().version() 

 

 

def stamp(version): 

    return get_backend().stamp(version) 

 

 

def revision(message, autogenerate): 

    return get_backend().revision(message, autogenerate) 

 

 

def create_schema(): 

    return get_backend().create_schema()