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OpenStack Study: migration.py**** CubicPower OpenStack Study **** 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(session.get_engine(), repository, version) else: return versioning_api.downgrade(session.get_engine(), repository, version)
**** CubicPower OpenStack Study **** def db_version(): repository = _find_migrate_repo() try: return versioning_api.db_version(session.get_engine(), repository) except versioning_exceptions.DatabaseNotControlledError: meta = sqlalchemy.MetaData() engine = session.get_engine() meta.reflect(bind=engine) tables = meta.tables if len(tables) == 0: db_version_control(INIT_VERSION) return versioning_api.db_version(session.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."))
**** CubicPower OpenStack Study **** def db_initial_version(): return INIT_VERSION
**** CubicPower OpenStack Study **** def db_version_control(version=None): repository = _find_migrate_repo() versioning_api.version_control(session.get_engine(), repository, version) return version
**** CubicPower OpenStack Study **** 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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