integration_tests: add test for LP: #1898997 (#713)

integration_tests: add test for LP: #1898997

This introduces the `lxd_config_dict` mark, used to specify a
free-form configuration dict to LXD for tests which only run there; and
the `not_xenial` and `not_bionic` marks, used to skip tests on
xenial/bionic via a basic release skipping mechanism.

This also bumps the pycloudlib commit we depend upon, as
the latest commit includes the changes required for LXD network config
to work.

(The `lxd_config_dict` change further complicated `_client`, so a minor
refactoring is applied.)

2 files changed, 89 insertions, 5 deletions

diff --git a/tests/integration_tests/bugs/test_lp1898997.py b/tests/integration_tests/bugs/test_lp1898997.py
new file mode 100644
index 00000000..54c88d82
--- /dev/null
+++ b/tests/integration_tests/bugs/test_lp1898997.py
@@ -0,0 +1,71 @@
+"""Integration test for LP: #1898997
+
+cloud-init was incorrectly excluding Open vSwitch bridge members from its list
+of interfaces.  This meant that instances which had only one interface which
+was in an Open vSwitch bridge would not boot correctly: cloud-init would not
+find the expected physical interfaces, so would not apply network config.
+
+This test checks that cloud-init believes it has successfully applied the
+network configuration, and confirms that the bridge can be used to ping the
+default gateway.
+"""
+import pytest
+
+MAC_ADDRESS = "de:ad:be:ef:12:34"
+
+
+NETWORK_CONFIG = """\
+bridges:
+        ovs-br:
+            dhcp4: true
+            interfaces:
+            - enp5s0
+            macaddress: 52:54:00:d9:08:1c
+            mtu: 1500
+            openvswitch: {{}}
+ethernets:
+    enp5s0:
+      mtu: 1500
+      set-name: enp5s0
+      match:
+          macaddress: {}
+version: 2
+""".format(MAC_ADDRESS)
+
+
+@pytest.mark.lxd_config_dict({
+    "user.network-config": NETWORK_CONFIG,
+    "volatile.eth0.hwaddr": MAC_ADDRESS,
+})
+@pytest.mark.lxd_vm
+@pytest.mark.not_bionic
+@pytest.mark.not_xenial
+@pytest.mark.sru_2020_11
+@pytest.mark.ubuntu
+class TestInterfaceListingWithOpenvSwitch:
+    def test_ovs_member_interfaces_not_excluded(self, client):
+        # We need to install openvswitch for our provided network configuration
+        # to apply (on next boot), so DHCP on our default interface to fetch it
+        client.execute("dhclient enp5s0")
+        client.execute("apt update -qqy")
+        client.execute("apt-get install -qqy openvswitch-switch")
+
+        # Now our networking config should successfully apply on a clean reboot
+        client.execute("cloud-init clean --logs")
+        client.restart()
+
+        cloudinit_output = client.read_from_file("/var/log/cloud-init.log")
+
+        # Confirm that the network configuration was applied successfully
+        assert "WARN" not in cloudinit_output
+        # Confirm that the applied network config created the OVS bridge
+        assert "ovs-br" in client.execute("ip addr")
+
+        # Test that we can ping our gateway using our bridge
+        gateway = client.execute(
+            "ip -4 route show default | awk '{ print $3 }'"
+        )
+        ping_result = client.execute(
+            "ping -c 1 -W 1 -I ovs-br {}".format(gateway)
+        )
+        assert ping_result.ok
diff --git a/tests/integration_tests/conftest.py b/tests/integration_tests/conftest.py
index 53ca5fb5..50b300c4 100644
--- a/tests/integration_tests/conftest.py
+++ b/tests/integration_tests/conftest.py
@@ -1,5 +1,6 @@
 # This file is part of cloud-init. See LICENSE file for license information.
 import datetime
+import functools
 import logging
 import pytest
 import os
@@ -18,6 +19,7 @@ from tests.integration_tests.clouds import (
     LxdContainerCloud,
     LxdVmCloud,
     OciCloud,
+    _LxdIntegrationCloud,
 )
 from tests.integration_tests.instances import (
     CloudInitSource,
@@ -74,6 +76,10 @@ def pytest_runtest_setup(item):
     if 'unstable' in test_marks and not integration_settings.RUN_UNSTABLE:
         pytest.skip('Test marked unstable. Manually remove mark to run it')
 
+    current_release = image.release
+    if "not_{}".format(current_release) in test_marks:
+        pytest.skip("Cannot run on release {}".format(current_release))
+
 
 # disable_subp_usage is defined at a higher level, but we don't
 # want it applied here
@@ -184,14 +190,21 @@ def _client(request, fixture_utils, session_cloud: IntegrationCloud):
     Launch the dynamic IntegrationClient instance using any provided
     userdata, yield to the test, then cleanup
     """
-    user_data = fixture_utils.closest_marker_first_arg_or(
-        request, 'user_data', None)
-    name = fixture_utils.closest_marker_first_arg_or(
-        request, 'instance_name', None
+    getter = functools.partial(
+        fixture_utils.closest_marker_first_arg_or, request, default=None
     )
+    user_data = getter('user_data')
+    name = getter('instance_name')
+    lxd_config_dict = getter('lxd_config_dict')
+
     launch_kwargs = {}
     if name is not None:
-        launch_kwargs = {"name": name}
+        launch_kwargs["name"] = name
+    if lxd_config_dict is not None:
+        if not isinstance(session_cloud, _LxdIntegrationCloud):
+            pytest.skip("lxd_config_dict requires LXD")
+        launch_kwargs["config_dict"] = lxd_config_dict
+
     with session_cloud.launch(
         user_data=user_data, launch_kwargs=launch_kwargs
     ) as instance: