Currently, with delay_delete enabled, the Glance scrubber happily deletes
whatever images you ask it to. That includes images that are currently in
use by Nova guests, which can really hose things. It'd be nice to have an
option to tell the scrubber to skip deletion of images that are currently
in use, which is fairly trivial to check for and provides a nice measure of
protection.

Without delay_delete enabled, checking for images in use likely takes too
much time, so this would be limited to just images that are scrubbed with
delay_delete.

I wanted to bring this up here before I go to the trouble of writing a spec
for it, particularly since it doesn't appear that glance currently talks to
Nova as a client at all. Is this something that folks would be interested
in having? Thanks!

-- 
Chris St. Pierre
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