old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  #
  # Copyright 2013 OpenStack Foundation
  #
  #    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.
  #
  
  """Add a unique constraint on (agent_type, host) columns to prevent a race
  condition when an agent entry is 'upserted'.
  
  Revision ID: 1fcfc149aca4
  Revises: e197124d4b9
  Create Date: 2013-11-27 18:35:28.148680
  
  """
  
  revision = '1fcfc149aca4'
  down_revision = 'e197124d4b9'
  
  migration_for_plugins = [
      'neutron.plugins.brocade.NeutronPlugin.BrocadePluginV2',
      'neutron.plugins.openvswitch.ovs_neutron_plugin.OVSNeutronPluginV2',
      'neutron.plugins.linuxbridge.lb_neutron_plugin.LinuxBridgePluginV2',
      'neutron.plugins.nec.nec_plugin.NECPluginV2',
      'neutron.plugins.nicira.NeutronPlugin.NvpPluginV2',
      'neutron.plugins.nicira.NeutronServicePlugin.NvpAdvancedPlugin',
      'neutron.plugins.vmware.plugin.NsxPlugin',
      'neutron.plugins.vmware.plugin.NsxServicePlugin',
      'neutron.services.loadbalancer.plugin.LoadBalancerPlugin',
      'neutron.plugins.ibm.sdnve_neutron_plugin.SdnvePluginV2',
      'neutron.plugins.oneconvergence.plugin.OneConvergencePluginV2',
      'neutron.plugins.mlnx.mlnx_plugin.MellanoxEswitchPlugin',
  ]
  
  from alembic import op
  
  from neutron.db import migration
  
  
  TABLE_NAME = 'agents'
  UC_NAME = 'uniq_agents0agent_type0host'
  
  
  def upgrade(active_plugins=None, options=None):
      if not migration.should_run(active_plugins, migration_for_plugins):
          return
  
      op.create_unique_constraint(
          name=UC_NAME,
          source=TABLE_NAME,
          local_cols=['agent_type', 'host']
      )
  
  
  def downgrade(active_plugins=None, options=None):
      if not migration.should_run(active_plugins, migration_for_plugins):
          return
  
      op.drop_constraint(
          name=UC_NAME,
          table_name=TABLE_NAME,
          type_='unique'
      )
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  #
  # Copyright 2013 OpenStack Foundation
  #
  #    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.
  #
  
  """Add a unique constraint on (agent_type, host) columns to prevent a race
  condition when an agent entry is 'upserted'.
  
  Revision ID: 1fcfc149aca4
  Revises: e197124d4b9
  Create Date: 2013-11-27 18:35:28.148680
  
  """
  
  revision = '1fcfc149aca4'
  down_revision = 'e197124d4b9'
  
  migration_for_plugins = [
      'neutron.plugins.brocade.NeutronPlugin.BrocadePluginV2',
      'neutron.plugins.openvswitch.ovs_neutron_plugin.OVSNeutronPluginV2',
      'neutron.plugins.linuxbridge.lb_neutron_plugin.LinuxBridgePluginV2',
      'neutron.plugins.ml2.plugin.Ml2Plugin',
      'neutron.plugins.nec.nec_plugin.NECPluginV2',
      'neutron.plugins.nicira.NeutronPlugin.NvpPluginV2',
      'neutron.plugins.nicira.NeutronServicePlugin.NvpAdvancedPlugin',
      'neutron.plugins.vmware.plugin.NsxPlugin',
      'neutron.plugins.vmware.plugin.NsxServicePlugin',
      'neutron.services.loadbalancer.plugin.LoadBalancerPlugin',
      'neutron.plugins.ibm.sdnve_neutron_plugin.SdnvePluginV2',
      'neutron.plugins.oneconvergence.plugin.OneConvergencePluginV2',
      'neutron.plugins.mlnx.mlnx_plugin.MellanoxEswitchPlugin',
  ]
  
  from alembic import op
  
  from neutron.db import migration
  
  
  TABLE_NAME = 'agents'
  UC_NAME = 'uniq_agents0agent_type0host'
  
  
  def upgrade(active_plugins=None, options=None):
      if not migration.should_run(active_plugins, migration_for_plugins):
          return
  
      op.create_unique_constraint(
          name=UC_NAME,
          source=TABLE_NAME,
          local_cols=['agent_type', 'host']
      )
  
  
  def downgrade(active_plugins=None, options=None):
      if not migration.should_run(active_plugins, migration_for_plugins):
          return
  
      op.drop_constraint(
          name=UC_NAME,
          table_name=TABLE_NAME,
          type_='unique'
      )
  
subject: Add missing ml2 plugin to migration 1fcfc149aca4