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# Copyright 2011 OpenStack LLC.
#
#    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.

from sqlalchemy import MetaData, Table


meta = MetaData()


def upgrade(migrate_engine):
    # Upgrade operations go here. Don't create your own engine;
    # bind migrate_engine to your metadata
    meta.bind = migrate_engine
    instances = Table('instances', meta, autoload=True,
                      autoload_with=migrate_engine)

    managed_disk = instances.c.managed_disk
    managed_disk.alter(name='auto_disk_config')


def downgrade(migrate_engine):
    meta.bind = migrate_engine
    instances = Table('instances', meta, autoload=True,
                      autoload_with=migrate_engine)

    image_ref_column = instances.c.auto_disk_config
    image_ref_column.alter(name='managed_disk')
