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# 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 oslo_log import log as logging
from sqlalchemy import MetaData, Table, func, select
from nova import exception
from nova.i18n import _, _LW
from nova import objects
LOG = logging.getLogger(__name__)
def upgrade(migrate_engine):
meta = MetaData()
meta.bind = migrate_engine
flavors = Table('flavors', meta, autoload=True)
count = select([func.count()]).select_from(flavors).scalar()
if count == 0:
# NOTE(danms): We need to be careful here if this is a new
# installation, which can't possibly have any mappings. Check
# to see if any flavors are defined to determine if we are
# upgrading an existing system. If not, then don't obsess over
# the lack of mappings
return
cell_mappings = Table('cell_mappings', meta, autoload=True)
count = select([func.count()]).select_from(cell_mappings).scalar()
# Two mappings are required at a minimum, cell0 and your first cell
if count < 2:
msg = _('Cell mappings are not created, but required for Ocata. '
'Please run nova-manage cell_v2 simple_cell_setup before '
'continuing.')
raise exception.ValidationError(detail=msg)
count = select([func.count()]).select_from(cell_mappings).where(
cell_mappings.c.uuid == objects.CellMapping.CELL0_UUID).scalar()
if count != 1:
msg = _('A mapping for Cell0 was not found, but is required for '
'Ocata. Please run nova-manage cell_v2 simple_cell_setup '
'before continuing.')
raise exception.ValidationError(detail=msg)
host_mappings = Table('host_mappings', meta, autoload=True)
count = select([func.count()]).select_from(host_mappings).scalar()
if count == 0:
msg = _LW('No host mappings were found, but are required for Ocata. '
'Please run nova-manage cell_v2 simple_cell_setup before '
'continuing.')
LOG.warning(msg)
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