Comment 2 for bug 1205006

-> return func(self, req, *args, **kwargs)
  /opt/stack/glance/glance/api/v1/images.py(686)update()
-> purge_props)
  /opt/stack/glance/glance/registry/client/v1/api.py(194)update_image_metadata()
-> return c.update_image(image_id, image_meta, purge_props)
> /opt/stack/glance/glance/registry/client/v1/client.py(158)update_image()
-> encrypted_metadata = self.encrypt_metadata(image_metadata['image'])

  /opt/stack/glance/glance/api/v1/images.py(690)update()
-> image_data)
  /opt/stack/glance/glance/api/v1/images.py(535)_handle_source()
-> image_meta = self._activate(req, image_id, location)
  /opt/stack/glance/glance/api/v1/images.py(474)_activate()
-> image_meta)
  /opt/stack/glance/glance/registry/client/v1/api.py(194)update_image_metadata()
-> return c.update_image(image_id, image_meta, purge_props)
> /opt/stack/glance/glance/registry/client/v1/client.py(158)update_image()
-> encrypted_metadata = self.encrypt_metadata(image_metadata['image'])

the registry is called twice:
one is pure update, and then activate()