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# Copyright 2012 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 and_, String, Column, MetaData, select, Table
def upgrade(migrate_engine):
meta = MetaData()
meta.bind = migrate_engine
instances = Table('instances', meta, autoload=True)
node = Column('node', String(length=255))
instances.create_column(node)
c_nodes = Table('compute_nodes', meta, autoload=True)
services = Table('services', meta, autoload=True)
# set instances.node = compute_nodes.hypervisore_hostname
q = select(
[instances.c.id, c_nodes.c.hypervisor_hostname],
whereclause=and_(
instances.c.deleted != True,
services.c.deleted != True,
services.c.binary == 'nova-compute',
c_nodes.c.deleted != True),
from_obj=instances.join(services,
instances.c.host == services.c.host)
.join(c_nodes,
services.c.id == c_nodes.c.service_id))
for (instance_id, hypervisor_hostname) in q.execute():
instances.update().where(instances.c.id == instance_id).\
values(node=hypervisor_hostname).\
execute()
def downgrade(migrate_engine):
meta = MetaData()
meta.bind = migrate_engine
instances = Table('instances', meta, autoload=True)
instances.drop_column('node')
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