Fix 500 if multi-tenant swift is used

1. store-info --details and image-create apis fail with 500 if
   swift configuration file is set in g-api.conf when muti-tenant
   swift store is used. Fixed this by excluding the unregistered
   conf parameter and added log warning.
2. Also, store-info --details fails with AttributeError, when
   multitenant is enabled for swift store since it doesn not set
   the container value during store configuration.
   Fixed this by returing `None` incase of multitenant swift store.

Closes-Bug: #2061947
Change-Id: I6cbd11fd0ee5758169a2e0e9961660edb844e65f

glance/api/v2/discovery.py

@@ -26,7 +26,7 @@ from glance.api.v2 import policy as api_policy
 from glance.common import exception
 from glance.common import wsgi
 import glance.db
-from glance.i18n import _
+from glance.i18n import _, _LW
 from glance.quota import keystone as ks_quota
 
 CONF = cfg.CONF
@@ -64,6 +64,21 @@ class InfoController(object):
                 continue
 
             stores = {}
+            if enabled_backends[backend] == 'swift':
+                conf_file = getattr(CONF, backend).swift_store_config_file
+                multitenant = getattr(CONF, backend).swift_store_multi_tenant
+                if multitenant and conf_file:
+                    msg = ("The config options 'swift_store_multi_tenant' "
+                           "and 'swift_store_config_file' are mutually "
+                           "exclusive. If you intend to use multi-tenant "
+                           "swift store, please make sure that you have "
+                           "not set a swift configuration file with the "
+                           "'swift_store_config_file' option. "
+                           "Excluding `%s:%s` store details from the "
+                           "response as it's not configured correctly."
+                           % (backend, enabled_backends[backend]))
+                    LOG.warning(_LW(msg))
+                    continue
             stores['id'] = backend
             description = getattr(CONF, backend).store_description
             if description:
@@ -103,7 +118,7 @@ class InfoController(object):
     @staticmethod
     def _get_swift_properties(store_detail):
         return {
-            'container': store_detail.container,
+            'container': getattr(store_detail, 'container', None),
             'large_object_size': store_detail.large_object_size,
             'large_object_chunk_size': store_detail.large_object_chunk_size
         }

glance/tests/unit/v2/test_discovery_stores.py

@@ -12,6 +12,7 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import glance_store
 from oslo_config import cfg
 import webob.exc
 
@@ -128,3 +129,23 @@ class TestInfoControllers(base.MultiStoreClearingUnitTest):
         self.assertRaises(webob.exc.HTTPForbidden,
                           self.controller.get_stores_detail,
                           req)
+
+    def test_swift_multitenant_and_conf_file_enabled(self):
+        self.config(enabled_backends={'fast-rbd': 'rbd', 'test': 'swift'})
+        glance_store.register_store_opts(CONF)
+        self.config(default_backend='fast-rbd',
+                    group='glance_store')
+        self.config(rbd_store_chunk_size=8688388, rbd_store_pool='images',
+                    rbd_thin_provisioning=False, group='fast-rbd')
+        self.config(swift_store_container='glance',
+                    swift_store_large_object_size=524288000,
+                    swift_store_large_object_chunk_size=204800000,
+                    swift_store_config_file='fake-file.conf',
+                    swift_store_multi_tenant=True,
+                    group='test')
+        glance_store.create_multi_stores(CONF)
+        req = unit_test_utils.get_fake_request(roles=['admin'])
+        output = self.controller.get_stores_detail(req)
+        self.assertNotEqual(len(CONF.enabled_backends), len(output['stores']))
+        self.assertNotIn('test',
+                         [store.get('id') for store in output['stores']])