Deleting volumes which are consumed as a basis for others

This patch includes two test scenarios:

- Create a cloned volume from another volume. Cinder should
be able to delete the source volume.

- Create a volume from a snapshot. Cinder should be able to
delete the source volumes while the new volume still exists.

Related-Bug: #1969643
Depends-On: https://review.opendev.org/c/openstack/cinder/+/848013
Change-Id: I8daed0824f5ac60877e839265c09217dcce6dd21

cinder_tempest_plugin/api/volume/test_volume_dependency.py

@@ -0,0 +1,65 @@
+# Copyright 2022 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 tempest import config
+from tempest.lib import decorators
+
+from cinder_tempest_plugin.api.volume import base
+
+CONF = config.CONF
+
+
+class VolumeDependencyTests(base.BaseVolumeTest):
+    min_microversion = '3.40'
+
+    @classmethod
+    def setup_clients(cls):
+        super(VolumeDependencyTests, cls).setup_clients()
+
+    @decorators.idempotent_id('42e9df95-854b-4840-9d55-ae62f65e9b8e')
+    def test_delete_source_volume(self):
+        """Test basic dependency deletion
+
+        * Create a volume with source_volid
+        * Delete the source volume
+        """
+        source_volume = self.create_volume()
+        kwargs = {'source_volid': source_volume['id']}
+        cloned_volume = self.create_volume(**kwargs)
+        self.assertEqual(source_volume['id'], cloned_volume['source_volid'])
+        self.volumes_client.delete_volume(source_volume['id'])
+        self.volumes_client.wait_for_resource_deletion(source_volume['id'])
+
+    @decorators.idempotent_id('900d8ea5-2afd-4fe5-a0c3-fab4744f0d40')
+    def test_delete_source_snapshot(self):
+        """Test basic dependency deletion with snapshot
+
+        * Create a snapshot from source volume
+        * Create a volume from that snapshot
+        * Delete the source snapshot
+        * Delete the source volume
+        """
+        source_volume = self.create_volume()
+        snapshot_source_volume = self.create_snapshot(source_volume['id'])
+        kwargs = {'snapshot_id': snapshot_source_volume['id']}
+        volume_from_snapshot = self.create_volume(**kwargs)
+        self.assertEqual(volume_from_snapshot['snapshot_id'],
+                         snapshot_source_volume['id'])
+
+        self.snapshots_client.delete_snapshot(snapshot_source_volume['id'])
+        self.snapshots_client.wait_for_resource_deletion(
+            snapshot_source_volume['id'])
+        self.volumes_client.delete_volume(source_volume['id'])
+        self.volumes_client.wait_for_resource_deletion(source_volume['id'])