add a regression test for all compute RPCAPI 6.x pinnings for rebuild

We forgot that we automatically pin our RPC calls to the RPC version
that the older compute supports, so when rolling-upgrading computes, we
continue to use either Yoga or Zed versions for example when upgrading
to 2023.1.

Since the new parameters aren't optional, we broke the
rebuild_instance() method then for Yoga to Zed and Zed to 2023.1.

Change-Id: Icf340f3d4c5ce0a4b7388003f168e7c479e58eee
Related-Bug: #2040264

Author: sbauza

nova/tests/functional/regressions/test_bug_2040264.py

@@ -0,0 +1,69 @@
+# 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 import fixtures as nova_fixtures
+from nova.tests.functional.api import client
+from nova.tests.functional import integrated_helpers
+
+
+class ComputeVersion6xPinnedRpcTests(integrated_helpers._IntegratedTestBase):
+
+    compute_driver = 'fake.MediumFakeDriver'
+    ADMIN_API = True
+    api_major_version = 'v2.1'
+    microversion = 'latest'
+
+    def setUp(self):
+        super(ComputeVersion6xPinnedRpcTests, self).setUp()
+        self.useFixture(nova_fixtures.CastAsCallFixture(self))
+
+        self.compute1 = self._start_compute(host='host1')
+
+    def _test_rebuild_instance_with_compute_rpc_pin(self, version_cap):
+        # Since passing the latest microversion (>= 2.93) passes
+        # the 'reimage_boot_volume' parameter as True and it is
+        # not acceptable with compute RPC version (required 6.1)
+        # These tests fail, so assigning microversion to 2.92
+        self.api.microversion = '2.92'
+        self.flags(compute=version_cap, group='upgrade_levels')
+
+        server_req = self._build_server(networks='none')
+        server = self.api.post_server({'server': server_req})
+        server = self._wait_for_state_change(server, 'ACTIVE')
+
+        self.api.post_server_action(server['id'], {'rebuild': {
+            'imageRef': '155d900f-4e14-4e4c-a73d-069cbf4541e6'
+        }})
+
+    # We automatically pin to 6.0 if old computes are Yoga or older.
+    def test_rebuild_instance_6_0(self):
+        e = self.assertRaises(client.OpenStackApiException,
+            self._test_rebuild_instance_with_compute_rpc_pin, '6.0')
+        self.assertEqual(500, e.response.status_code)
+        # NOTE(sbauza): This returns a TypeError because of
+        # 'reimage_boot_volume' and 'target_state' parameters missing from the
+        # rcpapi caller.
+        self.assertIn('TypeError', e.response.text)
+
+    # We automatically pin to 6.1 if old computes are Zed.
+    def test_rebuild_instance_6_1(self):
+        e = self.assertRaises(client.OpenStackApiException,
+            self._test_rebuild_instance_with_compute_rpc_pin, '6.1')
+        self.assertEqual(500, e.response.status_code)
+        # NOTE(sbauza): This returns a TypeError because of
+        # 'reimage_boot_volume' and 'target_state' parameters missing from the
+        # rcpapi caller.
+        self.assertIn('TypeError', e.response.text)
+
+    # We automatically pin to 6.2 if old computes are 2023.1.
+    def test_rebuild_instance_6_2(self):
+        self._test_rebuild_instance_with_compute_rpc_pin('6.2')