Make ubuntu_interface configurable again

With some recent changes, the virt-customize command that modifies the
ubuntu guest image was broken: the interface name was hardcoded to
"ens3" and in some cases it should be set to "enp3s0". This patch makes
the value it configurable.

Change-Id: If31d9d998931253cbea9ae5310e2c36b6b7e2ce9

infrared_plugin/plugin.spec

@@ -268,6 +268,17 @@ subparsers:
                 Timeout error is raised if an ubuntu instance is not reachable
                 before it expires
             ansible_variable: ubuntu_is_reachable_timeout
+          ubuntu-vm-nic-name:
+            type: Value
+            help: |
+                NIC name expected on Ubuntu VM instances.
+                When Openstack spawns these VMs, their NIC (usually they
+                only have one NIC and one VLAN on that NIC) name is usually
+                "ens3", but with some Openstack versions, it is "enp3s0".
+                Defaults to "enp3s0" because it is the value obtained with
+                Openstack versions that use infrared.
+            default: "enp3s0"
+            ansible_variable: ubuntu_nic_name
           cleanup-containerlist-file:
             type: Bool
             help:  |

roles/tobiko-common/defaults/main.yaml

@@ -72,5 +72,5 @@ download_images:
       --run-command 'systemctl enable iperf3-server@5201'
       --run-command 'echo "8021q" >> /etc/modules'
       --run-command
-      'echo "network:\n  version: 2\n  vlans:\n    vlan101:\n      dhcp4: true\n      dhcp4-overrides:\n        use-routes: false\n      dhcp6: true\n      dhcp6-overrides:\n        use-routes: false\n      id: 101\n      link: ens3\n"
+      'echo "network:\n  version: 2\n  vlans:\n    vlan101:\n      dhcp4: true\n      dhcp4-overrides:\n        use-routes: false\n      dhcp6: true\n      dhcp6-overrides:\n        use-routes: false\n      id: 101\n      link: {{ ubuntu_nic_name | default('ens3') }}\n"
       > /etc/netplan/75-tobiko-vlan.yaml'

roles/tobiko-configure/tasks/main.yaml

@@ -31,6 +31,12 @@
           value: True
         {%   endif %}
         {% endfor %}
+        {% if ubuntu_nic_name is defined %}
+        - section: ubuntu
+          option: interface_name
+          value: "{{ ubuntu_nic_name }}"
+        {% endif %}
+
   vars:
     sections: "{{ test_default_conf | combine(test_conf, recursive=True) }}"
 

tobiko/openstack/glance/config.py

@@ -59,7 +59,7 @@ def get_images_options():
              cfg.StrOpt('password',
                         help="Default " + name + " password"),
              cfg.StrOpt('interface_name',
-                        default=None,
+                        default=None if name != 'ubuntu' else 'ens3',
                         help="Default " + name + " interface name"),
              cfg.FloatOpt('connection_timeout',
                           default=None,

tobiko/openstack/stacks/_ubuntu.py

@@ -114,26 +114,7 @@ class UbuntuImageFixture(glance.CustomizedGlanceImageFixture):
         run_commands.append('echo "8021q" >> /etc/modules')
         return run_commands
 
-    @property
-    def ethernet_device(self) -> str:
-        if self._ethernet_device is None:
-            self._ethernet_device = self._get_ethernet_device()
-        return self._ethernet_device
-
-    @staticmethod
-    def _get_ethernet_device() -> str:
-        """From OSP17 and above, Ubuntu stack should use a different interface
-        name. This method returns the interface name, depending on the OSP
-        version.
-        """
-        if_name = CONF.tobiko.ubuntu.interface_name
-        if if_name is not None:
-            return if_name
-        from tobiko import tripleo
-        if tripleo.has_overcloud(min_version='17.0'):
-            return 'enp3s0'
-        else:
-            return 'ens3'
+    ethernet_device = CONF.tobiko.ubuntu.interface_name
 
     def _get_customized_suffix(self) -> str:
         return f'{super()._get_customized_suffix()}-{self.ethernet_device}'