Raise correct exception for duplicate networks

When using Quantum, if duplicate network ids are passed in on a
nova boot, nova-api raises a NetworkNotFound exception, which is
not correct.  This change causes it to raise a NetworkDuplicated
exception instead.

Fixes bug 1165088

Change-Id: I4f1f9aa5e1fa0e740b78e67760d924e2dd1d4d98

2 files changed, 23 insertions, 9 deletions

diff --git a/nova/network/quantumv2/api.py b/nova/network/quantumv2/api.py
index 3a6870d6e..5fe1ada51 100644
--- a/nova/network/quantumv2/api.py
+++ b/nova/network/quantumv2/api.py
@@ -441,15 +441,15 @@ class API(base.Base):
         net_ids = []
 
         for (net_id, _i, port_id) in requested_networks:
-            if not port_id:
-                net_ids.append(net_id)
-                continue
-            port = quantumv2.get_client(context).show_port(port_id).get('port')
-            if not port:
-                raise exception.PortNotFound(port_id=port_id)
-            if port.get('device_id', None):
-                raise exception.PortInUse(port_id=port_id)
-            net_id = port['network_id']
+            if port_id:
+                port = (quantumv2.get_client(context)
+                                 .show_port(port_id)
+                                 .get('port'))
+                if not port:
+                    raise exception.PortNotFound(port_id=port_id)
+                if port.get('device_id', None):
+                    raise exception.PortInUse(port_id=port_id)
+                net_id = port['network_id']
             if net_id in net_ids:
                 raise exception.NetworkDuplicated(network_id=net_id)
             net_ids.append(net_id)
diff --git a/nova/tests/network/test_quantumv2.py b/nova/tests/network/test_quantumv2.py
index 6a3b31412..95352425e 100644
--- a/nova/tests/network/test_quantumv2.py
+++ b/nova/tests/network/test_quantumv2.py
@@ -825,6 +825,20 @@ class TestQuantumv2(test.TestCase):
         except exception.NetworkNotFound as ex:
             self.assertTrue("my_netid2, my_netid3" in str(ex))
 
+    def test_validate_networks_duplicate(self):
+        """Verify that the correct exception is thrown when duplicate
+           network ids are passed to validate_networks.
+        """
+        requested_networks = [('my_netid1', None, None),
+                              ('my_netid1', None, None)]
+        self.mox.ReplayAll()
+        # Expected call from setUp.
+        quantumv2.get_client(None)
+        api = quantumapi.API()
+        self.assertRaises(exception.NetworkDuplicated,
+                          api.validate_networks,
+                          self.context, requested_networks)
+
     def _mock_list_ports(self, port_data=None):
         if port_data is None:
             port_data = self.port_data2