[PATCH 2/2] qemu-img: Require -F with -b backing image

[Eric Blake]

On Thu, Jul 08, 2021 at 03:00:36PM +0200, Kevin Wolf wrote:
> Am 03.05.2021 um 23:36 hat Eric Blake geschrieben:
> > @@ -17,7 +14,7 @@ qemu-io: can't open device TEST_DIR/t.qcow2: Could not open backing file: Unknow
> >  no file open, try 'help open'
> >  read 4096/4096 bytes at offset 0
> >  4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> > -qemu-img: warning: Deprecated use of backing file without explicit backing format, use of this image requires potentially unsafe format probing
> > +qemu-img: Could not change the backing file to '/home/eblake/qemu/build/tests/qemu-iotests/scratch/t.qcow2.base': Invalid argument
> >  read 4096/4096 bytes at offset 0
> >  4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> 
> This is not exactly an improvement for the error message. Maybe worth a
> follow-up patch?

Sure, will do.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org