[Bug 263029] [mkimg] qcow2 images are not compressed by default

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263029

Ed Maste <emaste@freebsd.org> changed:

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--- Comment #2 from Ed Maste <emaste@freebsd.org> ---
Can you check the # of blocks occupied by the mkimg and qemu-img files (e.g.
stat -f%b)? Or paste a hexdump -Cv of the first few hundred bytes of each file
here.

AFAICT only qcow v3 actually supports compression; I wonder if the qemu-img
file is in fact a "sparse" image managed by qemu rather than the filesystem.

ref: https://git.qemu.org/?p=qemu.git;a=blob;f=docs/interop/qcow2.txt

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