Sort child versions before generating fingerprint

We need to sort the version dictionary to ensure py27
and py34 generate the same fingerprint.

Depends-On: I0f07858e96ea3baf46f8a453e253b9ed29c7f7e2
Depends-On: I33bd2d9dff9cb7dc1a50177db7286b7317966784
Change-Id: I0adc3d696c90dfe20d35bdf06f033eb3a2491fd0

oslo_versionedobjects/fixture.py

@@ -10,6 +10,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from collections import OrderedDict
 import hashlib
 import inspect
 import logging
@@ -145,7 +146,9 @@ class ObjectVersionChecker(object):
         # but many other things may require a version bump (method behavior
         # and return value changes, for example).
         if hasattr(obj_class, 'child_versions'):
-            relevant_data = (obj_fields, methods, obj_class.child_versions)
+            relevant_data = (obj_fields, methods,
+                             OrderedDict(
+                                 sorted(obj_class.child_versions.items())))
         else:
             relevant_data = (obj_fields, methods)
         fingerprint = '%s-%s' % (obj_class.VERSION, hashlib.md5(

oslo_versionedobjects/tests/test_objects.py

@@ -149,6 +149,16 @@ class RandomMixInWithNoFields(object):
 @base.VersionedObjectRegistry.register
 class TestSubclassedObject(RandomMixInWithNoFields, MyObj):
     fields = {'new_field': fields.Field(fields.String())}
+    child_versions = {
+        '1.0': '1.0',
+        '1.1': '1.1',
+        '1.2': '1.1',
+        '1.3': '1.2',
+        '1.4': '1.3',
+        '1.5': '1.4',
+        '1.6': '1.5',
+        '1.7': '1.6',
+        }
 
 
 class TestRegistry(test.TestCase):
@@ -421,7 +431,7 @@ class TestFixture(_BaseTestCase):
         hashes = checker.get_hashes()
         # NOTE(danms): If this object's version or hash changes, this needs
         # to change. Otherwise, leave it alone.
-        self.assertEqual('1.6-b56dbb7efe42a7ceb137d958fc4066cf',
+        self.assertEqual('1.6-7157ceb869f8f63fb9a955e6a7080ad7',
                          hashes['TestSubclassedObject'])
 
     def test_test_hashes(self):