old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # 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.
  
  from sqlalchemy import *
  from sqlalchemy.sql import text
  from migrate import *
  
  from nova import log as logging
  
  
  meta = MetaData()
  
  instances = Table('instances', meta,
          Column('id', Integer(),  primary_key=True, nullable=False),
          )
  
  instances_os_type = Column('os_type',
                             String(length=255, convert_unicode=False,
                                    assert_unicode=None, unicode_error=None,
                                    _warn_on_bytestring=False),
                             nullable=True)
  
  
  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.create_column(instances_os_type)
      migrate_engine.execute(instances.update()\
                             .where(instances.c.os_type == None)\
                             .values(os_type='linux'))
  
  
  def downgrade(migrate_engine):
      meta.bind = migrate_engine
  
      instances.drop_column('os_type')
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2010 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 *
  from sqlalchemy.sql import text
  from migrate import *
  
  from nova import log as logging
  
  
  meta = MetaData()
  
  instances = Table('instances', meta,
          Column('id', Integer(),  primary_key=True, nullable=False),
          )
  
  instances_os_type = Column('os_type',
                             String(length=255, convert_unicode=False,
                                    assert_unicode=None, unicode_error=None,
                                    _warn_on_bytestring=False),
                             nullable=True)
  
  
  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.create_column(instances_os_type)
      migrate_engine.execute(instances.update()\
                             .where(instances.c.os_type == None)\
                             .values(os_type='linux'))
  
  
  def downgrade(migrate_engine):
      meta.bind = migrate_engine
  
      instances.drop_column('os_type')
  
subject: fix the copyright notice in migration