Use name filter in GlanceImageService show_by_name

Fixes bug 883289

Change-Id: Ie2e62aea55e6541dc4ad1a725130fbf0259362fb

nova/image/glance.py

@@ -227,13 +227,11 @@ def show(self, context, image_id):
 
     def show_by_name(self, context, name):
         """Returns a dict containing image data for the given name."""
-        # TODO(vish): replace this with more efficient call when glance
-        #             supports it.
-        image_metas = self.detail(context)
-        for image_meta in image_metas:
-            if name == image_meta.get('name'):
-                return image_meta
-        raise exception.ImageNotFound(image_id=name)
+        image_metas = self.detail(context, filters={'name': name})
+        try:
+            return image_metas[0]
+        except (IndexError, TypeError):
+            raise exception.ImageNotFound(image_id=name)
 
     def get(self, context, image_id, data):
         """Calls out to Glance for metadata and data and writes data."""

nova/tests/image/test_glance.py

@@ -193,10 +193,6 @@ def test_create_and_show_non_existing_image(self):
                           'bad image id')
 
     def test_create_and_show_non_existing_image_by_name(self):
-        fixture = self._make_fixture(name='test image')
-        image_id = self.service.create(self.context, fixture)['id']
-
-        self.assertNotEquals(None, image_id)
         self.assertRaises(exception.ImageNotFound,
                           self.service.show_by_name,
                           self.context,