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Description of problem:
Per my email discussion with Richard:
> 1.When sparsifying, virt-sparsify is only working on the current snap? Is
> that the intention?
virt-sparsify isn't really tested on snapshots at all. It's expecting
a single base image that it can sparsify.
> 2. Perhaps it should at least warn that there's work to be done on the base?
It could check that, and should probably just stop if it encounters
that. I can't think of a case where you'd want to sparsify a
snapshot.