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

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 06 Apr 2022 18:53:41 UTC

Ed Maste <emaste@freebsd.org> changed:

           What    |Removed                     |Added
                 CC|                            |emaste@freebsd.org

--- 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

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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