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

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

--- Comment #3 from Ed Maste <emaste@freebsd.org> ---
Starting with a 1G file of all zeros and converting I see:

$ mkimg -f qcow2 -o mkimg.qcow2.out -s gpt -p freebsd-ufs:=sparse
-rw-r--r--  1 emaste  emaste      524288 Apr  6 15:28 mkimg.qcow2.out

$ mkimg -f raw -o mkimg.raw.out -s gpt -p freebsd-ufs:=sparse
-rw-r--r--  1 emaste  emaste  1073744384 Apr  6 15:28 mkimg.raw.out

$ qemu-img convert -S 1k -p -f raw -O qcow2 -c mkimg.raw.out qemu-img.out
-rw-r--r--  1 emaste  emaste      458752 Apr  6 15:30 qemu-img.out

$ hexdump -Cv mkimg.qcow2.out
00000000  51 46 49 fb 00 00 00 02  00 00 00 00 00 00 00 00  |QFI.............|
00000010  00 00 00 00 00 00 00 10  00 00 00 00 40 01 00 00  |............@...|
mkimg indeed produces V2

$ hexdump -Cv qemu-img.out
00000000  51 46 49 fb 00 00 00 03  00 00 00 00 00 00 00 00  |QFI.............|
00000010  00 00 00 00 00 00 00 10  00 00 00 00 40 00 0a 00  |............@...|
qemu-img produces V3

We can ask for qcow2 compat:
$ qemu-img convert -S 1k -p -f raw -O qcow2 -o compat=0.10 -c mkimg.raw.out
qemu-img.compat.out
-rw-r--r--  1 emaste  emaste      458752 Apr  6 15:36 qemu-img.compat.out

$ hexdump -Cv qemu-img.compat.out
00000000  51 46 49 fb 00 00 00 02  00 00 00 00 00 00 00 00  |QFI.............|
00000010  00 00 00 00 00 00 00 10  00 00 00 00 40 00 0a 00  |............@...|

It is now V2.

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