Fix ignored --user-domain in role assignment list

Fix the wrong value assignment which made the --user-domain option
ignored. Unit tests are updated to verify usage of domain options to
avoid further regressions.

Also drop the redundant look up of domain id to avoid unnecessary API
call.

Closes-Bug: #2085604
Change-Id: I5112b8e831fb26eb6544615277f0d3fe4f15dc5a

Author: kajinamit

openstackclient/identity/common.py

@@ -184,62 +184,50 @@ def _get_token_resource(client, resource, parsed_name, parsed_domain=None):
         return parsed_name
 
 
-def _get_domain_id_if_requested(identity_client, domain_name_or_id):
-    if not domain_name_or_id:
-        return None
-    domain = find_domain(identity_client, domain_name_or_id)
-    return domain.id
-
-
 def find_domain(identity_client, name_or_id):
     return _find_identity_resource(
         identity_client.domains, name_or_id, domains.Domain
     )
 
 
 def find_group(identity_client, name_or_id, domain_name_or_id=None):
-    domain_id = _get_domain_id_if_requested(identity_client, domain_name_or_id)
-    if not domain_id:
+    if domain_name_or_id is None:
         return _find_identity_resource(
             identity_client.groups, name_or_id, groups.Group
         )
-    else:
-        domain_id = find_domain(identity_client, domain_id).id
-        return _find_identity_resource(
-            identity_client.groups,
-            name_or_id,
-            groups.Group,
-            domain_id=domain_id,
-        )
+
+    domain_id = find_domain(identity_client, domain_name_or_id).id
+    return _find_identity_resource(
+        identity_client.groups,
+        name_or_id,
+        groups.Group,
+        domain_id=domain_id,
+    )
 
 
 def find_project(identity_client, name_or_id, domain_name_or_id=None):
-    domain_id = _get_domain_id_if_requested(identity_client, domain_name_or_id)
-    if not domain_id:
+    if domain_name_or_id is None:
         return _find_identity_resource(
             identity_client.projects, name_or_id, projects.Project
         )
-    else:
-        domain_id = find_domain(identity_client, domain_id).id
-        return _find_identity_resource(
-            identity_client.projects,
-            name_or_id,
-            projects.Project,
-            domain_id=domain_id,
-        )
+    domain_id = find_domain(identity_client, domain_name_or_id).id
+    return _find_identity_resource(
+        identity_client.projects,
+        name_or_id,
+        projects.Project,
+        domain_id=domain_id,
+    )
 
 
 def find_user(identity_client, name_or_id, domain_name_or_id=None):
-    domain_id = _get_domain_id_if_requested(identity_client, domain_name_or_id)
-    if not domain_id:
+    if domain_name_or_id is None:
         return _find_identity_resource(
             identity_client.users, name_or_id, users.User
         )
-    else:
-        domain_id = find_domain(identity_client, domain_id).id
-        return _find_identity_resource(
-            identity_client.users, name_or_id, users.User, domain_id=domain_id
-        )
+    domain_id = find_domain(identity_client, domain_name_or_id).id
+    return _find_identity_resource(
+        identity_client.users, name_or_id, users.User, domain_id=domain_id
+    )
 
 
 def _find_identity_resource(

openstackclient/identity/v3/role_assignment.py

@@ -148,7 +148,7 @@ def take_action(self, parsed_args):
 
         user_domain_id = None
         if parsed_args.user_domain:
-            project_domain_id = _find_sdk_id(
+            user_domain_id = _find_sdk_id(
                 identity_client.find_domain,
                 name_or_id=parsed_args.user_domain,
             )