azure/net: generate_fallback_nic emits network v2 config instead of v1

The function generate_fallback_config is used by Azure by default when
not consuming IMDS configuration data. This function is also used by any
datasource which does not implement it's own network config. This simple
fallback configuration sets up dhcp on the most likely NIC. It will now
emit network v2 instead of network v1.

This is a step toward moving all components talking in v2 and allows us
to avoid costly conversions between v1 and v2 for newer distributions
which rely on netplan.

1 files changed, 58 insertions, 1 deletions

diff --git a/tests/unittests/test_datasource/test_azure.py b/tests/unittests/test_datasource/test_azure.py
index 2de2aea2..4d57cebc 100644
--- a/tests/unittests/test_datasource/test_azure.py
+++ b/tests/unittests/test_datasource/test_azure.py
@@ -12,6 +12,7 @@ from cloudinit.tests.helpers import (
     HttprettyTestCase, CiTestCase, populate_dir, mock, wrap_and_call,
     ExitStack, resourceLocation)
 
+import copy
 import crypt
 import httpretty
 import json
@@ -129,6 +130,26 @@ NETWORK_METADATA = {
     }
 }
 
+SECONDARY_INTERFACE = {
+    "macAddress": "220D3A047598",
+    "ipv6": {
+        "ipAddress": []
+    },
+    "ipv4": {
+        "subnet": [
+            {
+                "prefix": "24",
+                "address": "10.0.1.0"
+            }
+        ],
+        "ipAddress": [
+            {
+                "privateIpAddress": "10.0.1.5",
+            }
+        ]
+    }
+}
+
 MOCKPATH = 'cloudinit.sources.DataSourceAzure.'
 
 
@@ -619,8 +640,43 @@ scbus-1 on xpt0 bus 0
             'ethernets': {
                 'eth0': {'set-name': 'eth0',
                          'match': {'macaddress': '00:0d:3a:04:75:98'},
-                         'dhcp4': True}},
+                         'dhcp4': True,
+                         'dhcp4-overrides': {'route-metric': 100}}},
+            'version': 2}
+        dsrc = self._get_ds(data)
+        dsrc.get_data()
+        self.assertEqual(expected_network_config, dsrc.network_config)
+
+    def test_network_config_set_from_imds_route_metric_for_secondary_nic(self):
+        """Datasource.network_config adds route-metric to secondary nics."""
+        sys_cfg = {'datasource': {'Azure': {'apply_network_config': True}}}
+        odata = {}
+        data = {'ovfcontent': construct_valid_ovf_env(data=odata),
+                'sys_cfg': sys_cfg}
+        expected_network_config = {
+            'ethernets': {
+                'eth0': {'set-name': 'eth0',
+                         'match': {'macaddress': '00:0d:3a:04:75:98'},
+                         'dhcp4': True,
+                         'dhcp4-overrides': {'route-metric': 100}},
+                'eth1': {'set-name': 'eth1',
+                         'match': {'macaddress': '22:0d:3a:04:75:98'},
+                         'dhcp4': True,
+                         'dhcp4-overrides': {'route-metric': 200}},
+                'eth2': {'set-name': 'eth2',
+                         'match': {'macaddress': '33:0d:3a:04:75:98'},
+                         'dhcp4': True,
+                         'dhcp4-overrides': {'route-metric': 300}}},
             'version': 2}
+        imds_data = copy.deepcopy(NETWORK_METADATA)
+        imds_data['network']['interface'].append(SECONDARY_INTERFACE)
+        third_intf = copy.deepcopy(SECONDARY_INTERFACE)
+        third_intf['macAddress'] = third_intf['macAddress'].replace('22', '33')
+        third_intf['ipv4']['subnet'][0]['address'] = '10.0.2.0'
+        third_intf['ipv4']['ipAddress'][0]['privateIpAddress'] = '10.0.2.6'
+        imds_data['network']['interface'].append(third_intf)
+
+        self.m_get_metadata_from_imds.return_value = imds_data
         dsrc = self._get_ds(data)
         dsrc.get_data()
         self.assertEqual(expected_network_config, dsrc.network_config)
@@ -925,6 +981,7 @@ scbus-1 on xpt0 bus 0
         expected_cfg = {
             'ethernets': {
                 'eth0': {'dhcp4': True,
+                         'dhcp4-overrides': {'route-metric': 100},
                          'match': {'macaddress': '00:0d:3a:04:75:98'},
                          'set-name': 'eth0'}},
             'version': 2}