Add CompareOpenStack class.

The CompareOpenStack class allows the comparison of OpenStack codenames.

(cherry picked from commit 7205e31)

unit_tests/utilities/test_zaza_utilities_os_versions.py

@@ -0,0 +1,32 @@
+# Copyright 2023 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+import unit_tests.utils as ut_utils
+from zaza.openstack.utilities import os_versions
+
+
+class TestOpenStackUtils(ut_utils.BaseTestCase):
+
+    def test_compare_openstack(self):
+        zed = os_versions.CompareOpenStack('zed')
+        yoga = os_versions.CompareOpenStack('yoga')
+        xena = os_versions.CompareOpenStack('xena')
+        self.assertGreater(zed, yoga)
+        self.assertLess(yoga, zed)
+        self.assertGreaterEqual(zed, zed)
+        self.assertGreaterEqual(zed, yoga)
+        self.assertGreaterEqual(yoga, xena)
+
+        self.assertEqual("CompareOpenStack<zed>", repr(zed))

zaza/openstack/utilities/os_versions.py

@@ -359,6 +359,10 @@ def __le__(self, other):
         """Do less than or equals."""
         return not self.__gt__(other)
 
+    def __repr__(self):
+        """Return the representation of CompareOpenStack."""
+        return "%s<%s>" % (self.__class__.__name__, self._list[self.index])
+
     def __str__(self):
         """Give back the item at the index.
 
@@ -384,3 +388,15 @@ class CompareHostReleases(BasicStringComparator):
     """
 
     _list = UBUNTU_RELEASES
+
+
+class CompareOpenStack(BasicStringComparator):
+    """Provide comparisons of OpenStack releases.
+
+    Use in the form of
+
+    if CompareOpenStack(release) > 'yoga':
+        # do something
+    """
+
+    _list = list(OPENSTACK_CODENAMES.values())