87 lines
2.7 KiB
Python
87 lines
2.7 KiB
Python
# Copyright 2014
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# The Cloudscaling Group, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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from migrate import exceptions as versioning_exceptions
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from migrate.versioning import api as versioning_api
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from migrate.versioning.repository import Repository
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import sqlalchemy
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from ec2api.db.sqlalchemy import api as db_session
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from ec2api import exception
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from ec2api.i18n import _
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INIT_VERSION = 0
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_REPOSITORY = None
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get_engine = db_session.get_engine
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def db_sync(version=None):
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if version is not None:
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try:
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version = int(version)
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except ValueError:
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raise exception.EC2Exception(_("version should be an integer"))
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current_version = db_version()
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repository = _find_migrate_repo()
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if version is None or version > current_version:
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return versioning_api.upgrade(get_engine(), repository, version)
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else:
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return versioning_api.downgrade(get_engine(), repository,
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version)
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def db_version():
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repository = _find_migrate_repo()
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try:
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return versioning_api.db_version(get_engine(), repository)
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except versioning_exceptions.DatabaseNotControlledError:
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meta = sqlalchemy.MetaData()
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engine = get_engine()
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meta.reflect(bind=engine)
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tables = meta.tables
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if len(tables) == 0:
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db_version_control(INIT_VERSION)
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return versioning_api.db_version(get_engine(), repository)
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else:
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# Some pre-Essex DB's may not be version controlled.
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# Require them to upgrade using Essex first.
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raise exception.EC2Exception(
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_("Upgrade DB using Essex release first."))
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def db_initial_version():
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return INIT_VERSION
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def db_version_control(version=None):
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repository = _find_migrate_repo()
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versioning_api.version_control(get_engine(), repository, version)
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return version
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def _find_migrate_repo():
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"""Get the path for the migrate repository."""
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global _REPOSITORY
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path = os.path.join(os.path.abspath(os.path.dirname(__file__)),
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'migrate_repo')
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assert os.path.exists(path)
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if _REPOSITORY is None:
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_REPOSITORY = Repository(path)
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return _REPOSITORY
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