1 files changed, 129 insertions, 0 deletions
diff --git a/tests/unittests/config/test_cc_install_hotplug.py b/tests/unittests/config/test_cc_install_hotplug.py
new file mode 100644
index 00000000..e67fce60
--- /dev/null
+++ b/tests/unittests/config/test_cc_install_hotplug.py
@@ -0,0 +1,129 @@
+# This file is part of cloud-init. See LICENSE file for license information.
+from collections import namedtuple
+from unittest import mock
+
+import pytest
+
+from cloudinit.config.cc_install_hotplug import (
+    HOTPLUG_UDEV_PATH,
+    HOTPLUG_UDEV_RULES_TEMPLATE,
+    handle,
+)
+from cloudinit.event import EventScope, EventType
+
+
+@pytest.fixture()
+def mocks():
+    m_update_enabled = mock.patch("cloudinit.stages.update_event_enabled")
+    m_write = mock.patch("cloudinit.util.write_file", autospec=True)
+    m_del = mock.patch("cloudinit.util.del_file", autospec=True)
+    m_subp = mock.patch("cloudinit.subp.subp")
+    m_which = mock.patch("cloudinit.subp.which", return_value=None)
+    m_path_exists = mock.patch("os.path.exists", return_value=False)
+
+    yield namedtuple(
+        "Mocks", "m_update_enabled m_write m_del m_subp m_which m_path_exists"
+    )(
+        m_update_enabled.start(),
+        m_write.start(),
+        m_del.start(),
+        m_subp.start(),
+        m_which.start(),
+        m_path_exists.start(),
+    )
+
+    m_update_enabled.stop()
+    m_write.stop()
+    m_del.stop()
+    m_subp.stop()
+    m_which.stop()
+    m_path_exists.stop()
+
+
+class TestInstallHotplug:
+    @pytest.mark.parametrize("libexec_exists", [True, False])
+    def test_rules_installed_when_supported_and_enabled(
+        self, mocks, libexec_exists
+    ):
+        mocks.m_which.return_value = "udevadm"
+        mocks.m_update_enabled.return_value = True
+        m_cloud = mock.MagicMock()
+        m_cloud.datasource.get_supported_events.return_value = {
+            EventScope.NETWORK: {EventType.HOTPLUG}
+        }
+
+        if libexec_exists:
+            libexecdir = "/usr/libexec/cloud-init"
+        else:
+            libexecdir = "/usr/lib/cloud-init"
+        with mock.patch("os.path.exists", return_value=libexec_exists):
+            handle(None, {}, m_cloud, mock.Mock(), None)
+            mocks.m_write.assert_called_once_with(
+                filename=HOTPLUG_UDEV_PATH,
+                content=HOTPLUG_UDEV_RULES_TEMPLATE.format(
+                    libexecdir=libexecdir
+                ),
+            )
+        assert mocks.m_subp.call_args_list == [
+            mock.call(
+                [
+                    "udevadm",
+                    "control",
+                    "--reload-rules",
+                ]
+            )
+        ]
+        assert mocks.m_del.call_args_list == []
+
+    def test_rules_not_installed_when_unsupported(self, mocks):
+        mocks.m_update_enabled.return_value = True
+        m_cloud = mock.MagicMock()
+        m_cloud.datasource.get_supported_events.return_value = {}
+
+        handle(None, {}, m_cloud, mock.Mock(), None)
+        assert mocks.m_write.call_args_list == []
+        assert mocks.m_del.call_args_list == []
+        assert mocks.m_subp.call_args_list == []
+
+    def test_rules_not_installed_when_disabled(self, mocks):
+        mocks.m_update_enabled.return_value = False
+        m_cloud = mock.MagicMock()
+        m_cloud.datasource.get_supported_events.return_value = {
+            EventScope.NETWORK: {EventType.HOTPLUG}
+        }
+
+        handle(None, {}, m_cloud, mock.Mock(), None)
+        assert mocks.m_write.call_args_list == []
+        assert mocks.m_del.call_args_list == []
+        assert mocks.m_subp.call_args_list == []
+
+    def test_rules_uninstalled_when_disabled(self, mocks):
+        mocks.m_path_exists.return_value = True
+        mocks.m_update_enabled.return_value = False
+        m_cloud = mock.MagicMock()
+        m_cloud.datasource.get_supported_events.return_value = {}
+
+        handle(None, {}, m_cloud, mock.Mock(), None)
+        mocks.m_del.assert_called_with(HOTPLUG_UDEV_PATH)
+        assert mocks.m_subp.call_args_list == [
+            mock.call(
+                [
+                    "udevadm",
+                    "control",
+                    "--reload-rules",
+                ]
+            )
+        ]
+        assert mocks.m_write.call_args_list == []
+
+    def test_rules_not_installed_when_no_udevadm(self, mocks):
+        mocks.m_update_enabled.return_value = True
+        m_cloud = mock.MagicMock()
+        m_cloud.datasource.get_supported_events.return_value = {
+            EventScope.NETWORK: {EventType.HOTPLUG}
+        }
+
+        handle(None, {}, m_cloud, mock.Mock(), None)
+        assert mocks.m_del.call_args_list == []
+        assert mocks.m_write.call_args_list == []
+        assert mocks.m_subp.call_args_list == []