diff options
| -rw-r--r-- | nova/virt/disk/api.py | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/nova/virt/disk/api.py b/nova/virt/disk/api.py index 47d56c954..9a457a318 100644 --- a/nova/virt/disk/api.py +++ b/nova/virt/disk/api.py @@ -120,9 +120,12 @@ class _DiskImage(object): # As a performance tweak, don't bother trying to # directly loopback mount a cow image. self.handlers = FLAGS.img_handlers[:] - if use_cow: + if use_cow and 'loop' in self.handlers: self.handlers.remove('loop') + if not self.handlers: + raise exception.Error(_('no capable image handler configured')) + @property def errors(self): """Return the collated errors from all operations.""" |