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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.
import os
from migrate import exceptions as versioning_exceptions
from migrate.versioning import api as versioning_api
from migrate.versioning.repository import Repository
import sqlalchemy
from nova.db.sqlalchemy import api as db_session
from nova import exception
from nova.i18n import _
INIT_VERSION = 215
_REPOSITORY = None
get_engine = db_session.get_engine
def db_sync(version=None):
if version is not None:
try:
version = int(version)
except ValueError:
raise exception.NovaException(_("version should be an integer"))
current_version = db_version()
repository = _find_migrate_repo()
if version is None or version > current_version:
return versioning_api.upgrade(get_engine(), repository, version)
else:
return versioning_api.downgrade(get_engine(), repository,
version)
def db_version():
repository = _find_migrate_repo()
try:
return versioning_api.db_version(get_engine(), repository)
except versioning_exceptions.DatabaseNotControlledError:
meta = sqlalchemy.MetaData()
engine = get_engine()
meta.reflect(bind=engine)
tables = meta.tables
if len(tables) == 0:
db_version_control(INIT_VERSION)
return versioning_api.db_version(get_engine(), repository)
else:
# Some pre-Essex DB's may not be version controlled.
# Require them to upgrade using Essex first.
raise exception.NovaException(
_("Upgrade DB using Essex release first."))
def db_initial_version():
return INIT_VERSION
def db_version_control(version=None):
repository = _find_migrate_repo()
versioning_api.version_control(get_engine(), repository, version)
return version
def _find_migrate_repo():
"""Get the path for the migrate repository."""
global _REPOSITORY
path = os.path.join(os.path.abspath(os.path.dirname(__file__)),
'migrate_repo')
assert os.path.exists(path)
if _REPOSITORY is None:
_REPOSITORY = Repository(path)
return _REPOSITORY
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