fix(neutron-understack): avoid loading config in the global module scope

python/neutron-understack/neutron_understack/config.py

@@ -1,13 +1,5 @@
 from oslo_config import cfg
 
-type_understack_opts = [
-    cfg.StrOpt(
-        "provisioning_network",
-        help="provisioning_network ID as configured in ironic.conf",
-        default="change_me",
-    ),
-]
-
 mech_understack_opts = [
     cfg.StrOpt(
         "nb_url",
@@ -115,10 +107,6 @@
 ]
 
 
-def register_ml2_type_understack_opts(config):
-    config.register_opts(type_understack_opts, "ml2_type_understack")
-
-
 def register_ml2_understack_opts(config):
     config.register_opts(mech_understack_opts, "ml2_understack")
 

python/neutron-understack/neutron_understack/neutron_understack_mech.py

@@ -22,9 +22,6 @@
 
 LOG = logging.getLogger(__name__)
 
-config.register_ml2_type_understack_opts(cfg.CONF)
-config.register_ml2_understack_opts(cfg.CONF)
-
 
 SUPPORTED_VNIC_TYPES = [portbindings.VNIC_BAREMETAL, portbindings.VNIC_NORMAL]
 
@@ -38,6 +35,7 @@ def connectivity(self):  # type: ignore
         return portbindings.CONNECTIVITY_L2
 
     def initialize(self):
+        config.register_ml2_understack_opts(cfg.CONF)
         conf = cfg.CONF.ml2_understack
         self.undersync = Undersync(conf.undersync_token, conf.undersync_url)
         self.ironic_client = IronicClient()
@@ -296,8 +294,4 @@ def check_vlan_transparency(self, context):
 
 
 def is_provisioning_network(network_id: str) -> bool:
-    provisioning_network = (
-        cfg.CONF.ml2_understack.provisioning_network
-        or cfg.CONF.ml2_type_understack.provisioning_network
-    )
-    return network_id == provisioning_network
+    return network_id == cfg.CONF.ml2_understack.provisioning_network

python/neutron-understack/neutron_understack/tests/conftest.py

@@ -22,7 +22,9 @@
 from neutron_lib import constants as p_const
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.callbacks.events import DBEventPayload
+from oslo_config import fixture as config_fixture
 
+from neutron_understack import config as understack_config
 from neutron_understack.ironic import IronicClient
 from neutron_understack.neutron_understack_mech import UnderstackDriver
 from neutron_understack.tests.helpers import Ml2PluginNoInit
@@ -276,7 +278,7 @@ def ironic_client(mocker) -> IronicClient:
 
 
 @pytest.fixture
-def understack_driver(ironic_client) -> UnderstackDriver:
+def understack_driver(oslo_config, ironic_client) -> UnderstackDriver:
     driver = UnderstackDriver()
     driver.undersync = Undersync("auth_token", "api_url")
     driver.ironic_client = ironic_client
@@ -341,18 +343,29 @@ def port_db_payload(network) -> DBEventPayload:
 
 
 @pytest.fixture
-def ml2_understack_conf(mocker, ucvni_group_id) -> None:
-    mocker.patch(
-        "neutron_understack.neutron_understack_mech.cfg.CONF.ml2_understack.ucvni_group",
-        str(ucvni_group_id),
+def oslo_config():
+    """CONF from oslo_config is global but we need to override it sometimes."""
+    conf_fixture = config_fixture.Config()
+    conf_fixture.setUp()
+    # register the ml2_understack options
+    understack_config.register_ml2_understack_opts(conf_fixture.conf)
+    yield conf_fixture
+    conf_fixture.cleanUp()
+
+
+@pytest.fixture
+def ml2_understack_conf(oslo_config, ucvni_group_id) -> None:
+    oslo_config.config(
+        ucvni_group=str(ucvni_group_id),
+        group="ml2_understack",
     )
-    mocker.patch(
-        "neutron_understack.neutron_understack_mech.cfg.CONF.ml2_understack.network_node_switchport_uuid",
-        "a27f7260-a7c5-4f0c-ac70-6258b026d368",
+    oslo_config.config(
+        network_node_switchport_uuid="a27f7260-a7c5-4f0c-ac70-6258b026d368",
+        group="ml2_understack",
     )
-    mocker.patch(
-        "neutron_understack.neutron_understack_mech.cfg.CONF.ml2_understack.undersync_dry_run",
-        False,
+    oslo_config.config(
+        undersync_dry_run=False,
+        group="ml2_understack",
     )
 
 

python/neutron-understack/neutron_understack/tests/test_trunk.py

@@ -336,14 +336,23 @@ class TestCheckSubportsSegmentationId:
     def test_when_trunk_id_is_network_node_trunk_id(
         self,
         mocker,
+        oslo_config,
         understack_trunk_driver,
         trunk_id,
     ):
-        mocker.patch(
-            "oslo_config.cfg.CONF.ml2_understack.network_node_trunk_uuid",
-            trunk_id,
+        oslo_config.config(
+            network_node_trunk_uuid=str(trunk_id),
+            group="ml2_understack",
+        )
+        # Mock to ensure the function returns early and doesn't call this
+        allowed_ranges_mock = mocker.patch(
+            "neutron_understack.utils.allowed_tenant_vlan_id_ranges"
+        )
+        result = understack_trunk_driver._check_subports_segmentation_id(
+            [], str(trunk_id)
         )
-        result = understack_trunk_driver._check_subports_segmentation_id([], trunk_id)
+        # Should not call allowed_tenant_vlan_id_ranges because it returns early
+        allowed_ranges_mock.assert_not_called()
         assert result is None
 
     def test_when_segmentation_id_is_in_allowed_range(

python/neutron-understack/neutron_understack/tests/test_utils.py

@@ -189,10 +189,11 @@ class TestAllowedTenantVlanIdRanges:
     def test_multiple_non_overlapping_ranges(
         self,
         mocker,
+        oslo_config,
     ):
-        mocker.patch(
-            "oslo_config.cfg.CONF.ml2_understack.default_tenant_vlan_id_range",
-            [1, 2000],
+        oslo_config.config(
+            default_tenant_vlan_id_range=[1, 2000],
+            group="ml2_understack",
         )
         mocker.patch(
             "neutron_understack.utils.fetch_vlan_network_segment_ranges",
@@ -205,10 +206,11 @@ def test_multiple_non_overlapping_ranges(
     def test_multiple_overlapping_ranges(
         self,
         mocker,
+        oslo_config,
     ):
-        mocker.patch(
-            "oslo_config.cfg.CONF.ml2_understack.default_tenant_vlan_id_range",
-            [1, 2000],
+        oslo_config.config(
+            default_tenant_vlan_id_range=[1, 2000],
+            group="ml2_understack",
         )
         mocker.patch(
             "neutron_understack.utils.fetch_vlan_network_segment_ranges",
@@ -221,10 +223,11 @@ def test_multiple_overlapping_ranges(
     def test_single_range(
         self,
         mocker,
+        oslo_config,
     ):
-        mocker.patch(
-            "oslo_config.cfg.CONF.ml2_understack.default_tenant_vlan_id_range",
-            [1, 2000],
+        oslo_config.config(
+            default_tenant_vlan_id_range=[1, 2000],
+            group="ml2_understack",
         )
         mocker.patch(
             "neutron_understack.utils.fetch_vlan_network_segment_ranges",