I'd love to use them for VM image building, something I'm doing quite a lot of at the moment. Having an editable FS overlay on top of a pristine root image with

I'd love to use them for VM image building, something I'm doing quite a lot of at the moment. Having an editable FS overlay on top of a pristine root image without having to futz with qcow2 and nbd would make the process a lot simpler.