new_contents: # Copyright 2020, Red Hat, Inc. 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.
  
  from nova.tests.functional import integrated_helpers
  
  
  class TestVolAttachCinderReset(integrated_helpers._IntegratedTestBase):
      """Regression test for bug 1908075.
  
      This regression test aims to assert if n-api allows a non-multiattached
      volume to be attached to multiple instances after an admin has forcibly
      reset the state of the volume in Cinder.
      """
  
      microversion = 'latest'
  
      def test_volume_attach_after_cinder_reset_state(self):
  
          volume_id = self.cinder.IMAGE_BACKED_VOL
  
          # Launch a server and attach a volume
          server_a = self._create_server(networks='none')
          self.api.post_server_volume(
              server_a['id'],
              {'volumeAttachment': {'volumeId': volume_id}}
          )
  
          # reset-state of the volume within the cinder fixture, we don't model
          # the state of the volume within the fixture so this will have to do.
          del self.cinder.volume_to_attachment[volume_id]
          self.assertNotIn(
              volume_id, self.cinder.volume_ids_for_instance(server_a['id']))
  
          # Launch a second server and attempt to attach the same volume again
          server_b = self._create_server(networks='none')
          # FIXME(lyarwood): n-api shouldn't accept this request as we already
          # have an active bdm record for this non-multiattach volume.
          self.api.post_server_volume(
              server_b['id'],
              {'volumeAttachment': {'volumeId': volume_id}}
          )
  
          # Assert that we have bdms within Nova still for this attachment
          self.assertEqual(
              volume_id,
              self.api.get_server_volumes(server_a['id'])[0].get('volumeId'))
          self.assertEqual(
              volume_id,
              self.api.get_server_volumes(server_b['id'])[0].get('volumeId'))
  
          # Assert that the new attachment is the only one in the fixture
          self.assertIn(
              volume_id, self.cinder.volume_ids_for_instance(server_b['id']))
  
      def test_volume_attach_after_cinder_reset_state_multiattach_volume(self):
  
          volume_id = self.cinder.MULTIATTACH_VOL
  
          # Launch a server and attach a volume
          server_a = self._create_server(networks='none')
          self.api.post_server_volume(
              server_a['id'],
              {'volumeAttachment': {'volumeId': volume_id}}
          )
  
          # reset-state of the volume within the cinder fixture, we don't model
          # the state of the volume within the fixture so this will have to do.
          del self.cinder.volume_to_attachment[volume_id]
          self.assertNotIn(
              volume_id, self.cinder.volume_ids_for_instance(server_a['id']))
  
          # Launch a second server and attempt to attach the same volume again
          server_b = self._create_server(networks='none')
          # NOTE(lyarwood): Unlike non-multiattach volumes this should always be
          # allowed as we can have multiple active bdms for multiattached volumes
          self.api.post_server_volume(
              server_b['id'],
              {'volumeAttachment': {'volumeId': volume_id}}
          )
  
          # Assert that we have bdms within Nova still for this attachment
          self.assertEqual(
              volume_id,
              self.api.get_server_volumes(server_a['id'])[0].get('volumeId'))
          self.assertEqual(
              volume_id,
              self.api.get_server_volumes(server_b['id'])[0].get('volumeId'))
  
          # Assert that the new attachment is the only one in the fixture
          self.assertIn(
              volume_id, self.cinder.volume_ids_for_instance(server_b['id']))
  
subject: Add regression test for bug #1908075