Fix for set-name bug in networkd renderer (#1100)

This patch address an issue where the use of the "set-name"
directive caused the networkd renderer to fail.

LP: #1949407

cloudinit/net/networkd.py

@@ -41,11 +41,11 @@ def update_section(self, sec, key, val):
 
     def get_final_conf(self):
         contents = ''
-        for k, v in self.conf_dict.items():
+        for k, v in sorted(self.conf_dict.items()):
             if not v:
                 continue
             contents += '['+k+']\n'
-            for e in v:
+            for e in sorted(v):
                 contents += e + '\n'
             contents += '\n'
 
@@ -242,6 +242,19 @@ def _render_content(self, ns):
                 name = iface['name']
                 # network state doesn't give dhcp domain info
                 # using ns.config as a workaround here
+
+                # Check to see if this interface matches against an interface
+                # from the network state that specified a set-name directive.
+                # If there is a device with a set-name directive and it has
+                # set-name value that matches the current name, then update the
+                # current name to the device's name. That will be the value in
+                # the ns.config['ethernets'] dict below.
+                for dev_name, dev_cfg in ns.config['ethernets'].items():
+                    if 'set-name' in dev_cfg:
+                        if dev_cfg.get('set-name') == name:
+                            name = dev_name
+                            break
+
                 self.dhcp_domain(ns.config['ethernets'][name], cfg)
 
             ret_dict.update({link: cfg.get_final_conf()})

cloudinit/net/tests/test_networkd.py

@@ -0,0 +1,64 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+
+from cloudinit import safeyaml
+from cloudinit.net import networkd, network_state
+
+V2_CONFIG_SET_NAME = """\
+network:
+  version: 2
+  ethernets:
+    eth0:
+      match:
+        macaddress: '00:11:22:33:44:55'
+      nameservers:
+        search: [spam.local, eggs.local]
+        addresses: [8.8.8.8]
+    eth1:
+      match:
+        macaddress: '66:77:88:99:00:11'
+      set-name: "ens92"
+      nameservers:
+        search: [foo.local, bar.local]
+        addresses: [4.4.4.4]
+"""
+
+V2_CONFIG_SET_NAME_RENDERED_ETH0 = """[Match]
+MACAddress=00:11:22:33:44:55
+Name=eth0
+
+[Network]
+DHCP=no
+DNS=8.8.8.8
+Domains=spam.local eggs.local
+
+"""
+
+V2_CONFIG_SET_NAME_RENDERED_ETH1 = """[Match]
+MACAddress=66:77:88:99:00:11
+Name=ens92
+
+[Network]
+DHCP=no
+DNS=4.4.4.4
+Domains=foo.local bar.local
+
+"""
+
+
+class TestNetworkdRenderState:
+    def _parse_network_state_from_config(self, config):
+        yaml = safeyaml.load(config)
+        return network_state.parse_net_config_data(yaml["network"])
+
+    def test_networkd_render_with_set_name(self):
+        ns = self._parse_network_state_from_config(V2_CONFIG_SET_NAME)
+        renderer = networkd.Renderer()
+        rendered_content = renderer._render_content(ns)
+
+        assert "eth0" in rendered_content
+        assert rendered_content["eth0"] == V2_CONFIG_SET_NAME_RENDERED_ETH0
+        assert "ens92" in rendered_content
+        assert rendered_content["ens92"] == V2_CONFIG_SET_NAME_RENDERED_ETH1
+
+
+# vi: ts=4 expandtab