virt-sparsify
Make virtual machine drive images thin-provisioned.
TLDR
Create a sparsified compressed image without snapshots from an unsparsified one
$ virt-sparsify --compress [path/to/image.qcow2] [path/to/image_new.qcow2]
Sparsify an image in-place
$ virt-sparsify --in-place [path/to/image.img]
