Cannot be used in WSL Ubuntu about libguestfs HOT 5 CLOSED

In theory that's right, but for virt-builder we use virt-sparsify --in-place + xz and I doubt there's any noticeable difference after compression, and probably barely anything before compression.

Back in the old days copying sparsification was necessary because the relevant qemu & kernel & filesystems didn't support the necessary trim/discard operations for in-place sparsify. But that has not been true for a very long time.

from libguestfs.

Assuming "zero the image" means sparsify and "compact" means convert it to qcow2, then not really. You could convert it to qcow2 first (qemu-img convert will do zeroes detection on the raw bits which will reduce the image size a lot), then run virt-sparsify on the result which will free space used by deleted files.

from libguestfs.

I would definitely use the --in-place option (note it overwrites the input) as that is vastly more efficient, and basically supported everywhere these days.

from libguestfs.

Its important I get as much out of it as possible and afaik in place isn't as efficient from a space savings pov right?

from libguestfs.

Okay I see! The command does successfully run thank you!
So you know if it's possible to zero the image and compact it within the same toolset? I'm currently running qemu-img after this to rewrite it to another file to remove the zerod space.

from libguestfs.