text: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2011 OpenStack LLC.
  # 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 migrate.changeset import *
  from sqlalchemy import *
  
  from glance.db.sqlalchemy.migrate_repo.schema import (
      Boolean, DateTime, BigInteger, Integer, String,
      Text, from_migration_import)
  
  
  def get_images_table(meta):
      """
      Returns the Table object for the images table that
      corresponds to the images table definition of this version.
      """
      images = Table('images',
                     meta,
                     Column('id', Integer(), primary_key=True, nullable=False),
                     Column('name', String(255)),
                     Column('disk_format', String(20)),
                     Column('container_format', String(20)),
                     Column('size', BigInteger()),
                     Column('status', String(30), nullable=False),
                     Column('is_public',
                            Boolean(),
                            nullable=False,
                            default=False,
                            index=True),
                     Column('location', Text()),
                     Column('created_at', DateTime(), nullable=False),
                     Column('updated_at', DateTime()),
                     Column('deleted_at', DateTime()),
                     Column('deleted',
                            Boolean(),
                            nullable=False,
                            default=False,
                            index=True),
                     mysql_engine='InnoDB',
                     extend_existing=True)
  
      return images
  
  
  def get_image_properties_table(meta):
      """
      No changes to the image properties table from 002...
      """
      (define_image_properties_table,) = from_migration_import(
          '002_add_image_properties_table', ['define_image_properties_table'])
  
      image_properties = define_image_properties_table(meta)
      return image_properties
  
  
  def upgrade(migrate_engine):
      meta = MetaData()
      meta.bind = migrate_engine
  
      # No changes to SQLite stores are necessary, since
      # there is no BIG INTEGER type in SQLite. Unfortunately,
      # running the Python 005_size_big_integer.py migration script
      # on a SQLite datastore results in an error in the sa-migrate
      # code that does the workarounds for SQLite not having
      # ALTER TABLE MODIFY COLUMN ability
  
      dialect = migrate_engine.url.get_dialect().name
  
      if not dialect.startswith('sqlite'):
          (get_images_table,) = from_migration_import(
              '003_add_disk_format', ['get_images_table'])
  
          images = get_images_table(meta)
          images.columns['size'].alter(type=BigInteger())
  
  
  def downgrade(migrate_engine):
      meta = MetaData()
      meta.bind = migrate_engine
  
      # No changes to SQLite stores are necessary, since
      # there is no BIG INTEGER type in SQLite. Unfortunately,
      # running the Python 005_size_big_integer.py migration script
      # on a SQLite datastore results in an error in the sa-migrate
      # code that does the workarounds for SQLite not having
      # ALTER TABLE MODIFY COLUMN ability
  
      dialect = migrate_engine.url.get_dialect().name
  
      if not dialect.startswith('sqlite'):
          images = get_images_table(meta)
          images.columns['size'].alter(type=Integer())
  