Add flag for DEFROUTE=no in ifcfg files to ignore DHCP gateway

When multiple interfaces are configured with DHCP, and more than
one interface receives a gateway from the DHCP server(s), the
resulting default gateway on the system is unpredictable. This
change adds the "defroute" boolean to the configuration syntax
for os-net-config. Any interface type may be marked so that the
gateway received from the DHCP server will not be eligible as a
default gateway for the system. This only works for ifcfg files,
/etc/network/interfaces lacks an equivalent option.

Change-Id: Id775f3506b2ec60c9a2833efd49fb8319151c00d
Closes-Bug: 1449288

1 files changed, 14 insertions, 0 deletions

diff --git a/os_net_config/tests/test_objects.py b/os_net_config/tests/test_objects.py
index 268a48b..2e545d0 100644
--- a/os_net_config/tests/test_objects.py
+++ b/os_net_config/tests/test_objects.py
@@ -94,6 +94,20 @@ class TestInterface(base.TestCase):
         self.assertEqual("em1", interface.name)
         self.assertEqual(True, interface.use_dhcp)
 
+    def test_from_json_defroute(self):
+        data = '{"type": "interface", "name": "em1", "use_dhcp": true}'
+        interface1 = objects.object_from_json(json.loads(data))
+        data = """{
+"type": "interface",
+"name": "em1",
+"use_dhcp": true,
+"defroute": false
+}
+"""
+        interface2 = objects.object_from_json(json.loads(data))
+        self.assertEqual(True, interface1.defroute)
+        self.assertEqual(False, interface2.defroute)
+
     def test_from_json_dhcp_nic1(self):
         def dummy_numbered_nics(nic_mapping=None):
             return {"nic1": "em3"}