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

[Kevin Wolf]

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?

Kevin