Fallback to None on missing Glance image attrs

It's possible for glance images to be missing attributes like name and
checksum. We'll just set those to None by default to avoid missing key
exceptions being raised.

Closes-Bug: #1308058
Change-Id: I85c42f8351763da201021a22f5ff0ebd62c6b2db
(cherry picked from commit 993facb3bf)

cinder/image/glance.py

@@ -431,7 +431,7 @@ def _extract_attributes(image):
         elif attr == 'checksum' and output['status'] != 'active':
             output[attr] = None
         else:
-            output[attr] = getattr(image, attr)
+            output[attr] = getattr(image, attr, None)
 
     output['properties'] = getattr(image, 'properties', {})
 

cinder/tests/image/test_glance.py

@@ -17,8 +17,7 @@
 import datetime
 
 import glanceclient.exc
-import glanceclient.v2.client
-from glanceclient.v2.client import Client as glanceclient_v2
+from glanceclient.v2 import client as glance_client_v2
 from oslo.config import cfg
 
 from cinder import context
@@ -542,6 +541,50 @@ class TestGlanceImageService(test.TestCase):
             self.assertEqual(same_id, image_id)
             self.assertEqual(service._client.netloc, ipv6_url)
 
+    def test_extracting_missing_attributes(self):
+        """Verify behavior from glance objects that are missing attributes
+
+        This fakes the image class and is missing the checksum and name
+        attribute as the client would return if they're not set in the
+        database. Regression test for bug #1308058.
+        """
+        class MyFakeGlanceImage(glance_stubs.FakeImage):
+            def __init__(self, metadata):
+                IMAGE_ATTRIBUTES = ['size', 'disk_format', 'owner',
+                                    'container_format', 'id', 'created_at',
+                                    'updated_at', 'deleted', 'status',
+                                    'min_disk', 'min_ram', 'is_public']
+                raw = dict.fromkeys(IMAGE_ATTRIBUTES)
+                raw.update(metadata)
+                self.__dict__['raw'] = raw
+
+        metadata = {
+            'id': 1,
+            'created_at': self.NOW_DATETIME,
+            'updated_at': self.NOW_DATETIME,
+        }
+        image = MyFakeGlanceImage(metadata)
+        actual = glance._extract_attributes(image)
+        expected = {
+            'id': 1,
+            'name': None,
+            'is_public': None,
+            'size': None,
+            'min_disk': None,
+            'min_ram': None,
+            'disk_format': None,
+            'container_format': None,
+            'checksum': None,
+            'created_at': self.NOW_DATETIME,
+            'updated_at': self.NOW_DATETIME,
+            'deleted_at': None,
+            'deleted': None,
+            'status': None,
+            'properties': {},
+            'owner': None,
+        }
+        self.assertEqual(actual, expected)
+
 
 class TestGlanceClientVersion(test.TestCase):
     """Tests the version of the glance client generated."""
@@ -551,11 +594,11 @@ class TestGlanceClientVersion(test.TestCase):
         def fake_get_model(self):
             return
 
-        self.stubs.Set(glanceclient_v2, '_get_image_model',
+        self.stubs.Set(glance_client_v2.Client, '_get_image_model',
                        fake_get_model)
 
         try:
-            self.stubs.Set(glanceclient_v2, '_get_member_model',
+            self.stubs.Set(glance_client_v2.Client, '_get_member_model',
                            fake_get_model)
         except AttributeError:
             # method requires stubbing only with newer glanceclients.