Disallow resize if image not available

If a resize is attempted on an instance that was started from an image
that has since been deleted, a resize will fail. This change makes error
reporting a bit cleaner.

This change is needed since in order to actually properly support
resize/migrate when the image is deleted - it is necessary for nova to keep
a copy of the image metadata and re-use it in case of migration/resize.

Fixes bug: 1160773
Fixes bug: 1177001

Change-Id: Ifaea71f79c97046a4cde094e3a5e676772fcceb4

2 files changed, 39 insertions, 0 deletions

diff --git a/nova/api/openstack/compute/servers.py b/nova/api/openstack/compute/servers.py
index 2df16c886..24b760401 100644
--- a/nova/api/openstack/compute/servers.py
+++ b/nova/api/openstack/compute/servers.py
@@ -1098,6 +1098,17 @@ class Controller(wsgi.Controller):
         except exception.InstanceInvalidState as state_error:
             common.raise_http_conflict_for_instance_invalid_state(state_error,
                     'resize')
+        except exception.ImageNotAuthorized as image_error:
+            msg = _("You are not authorized to access the image "
+                    "the instance was started with.")
+            raise exc.HTTPUnauthorized(explanation=msg)
+        except exception.ImageNotFound as image_error:
+            msg = _("Image that the instance was started "
+                    "with could not be found.")
+            raise exc.HTTPBadRequest(explanation=msg)
+        except exception.Invalid:
+            msg = _("Invalid instance image.")
+            raise exc.HTTPBadRequest(explanation=msg)
 
         return webob.Response(status_int=202)
 
diff --git a/nova/tests/api/openstack/compute/test_server_actions.py b/nova/tests/api/openstack/compute/test_server_actions.py
index 3b8833dd7..473d3a253 100644
--- a/nova/tests/api/openstack/compute/test_server_actions.py
+++ b/nova/tests/api/openstack/compute/test_server_actions.py
@@ -630,6 +630,34 @@ class ServerActionsControllerTest(test.TestCase):
                           self.controller._action_resize,
                           req, FAKE_UUID, body)
 
+    def test_resize_with_image_exceptions(self):
+        body = dict(resize=dict(flavorRef="http://localhost/3"))
+        self.resize_called = 0
+        image_id = 'fake_image_id'
+
+        exceptions = [
+            (exception.ImageNotAuthorized(image_id=image_id),
+             webob.exc.HTTPUnauthorized),
+            (exception.ImageNotFound(image_id=image_id),
+             webob.exc.HTTPBadRequest),
+            (exception.Invalid, webob.exc.HTTPBadRequest),
+        ]
+
+        raised, expected = map(iter, zip(*exceptions))
+
+        def _fake_resize(obj, context, instance, flavor_id):
+            self.resize_called += 1
+            raise raised.next()
+
+        self.stubs.Set(compute_api.API, 'resize', _fake_resize)
+
+        for call_no in range(len(exceptions)):
+            req = fakes.HTTPRequest.blank(self.url)
+            self.assertRaises(expected.next(),
+                              self.controller._action_resize,
+                              req, FAKE_UUID, body)
+            self.assertEqual(self.resize_called, call_no + 1)
+
     def test_resize_with_too_many_instances(self):
         body = dict(resize=dict(flavorRef="http://localhost/3"))