Re: [PATCH v2 3/4] iotests: Add more qemu_img helpers

[Vladimir Sementsov-Ogievskiy]

28.07.2020 00:58, Nir Soffer wrote:
> Add 2 helpers for measuring and checking images:
> - qemu_img_measure()
> - qemu_img_check()
>
> Both use --output-json and parse the returned json to make easy to use
> in other tests. I'm going to use them in a new test, and I hope they
> will be useful in may other tests.
>
> Signed-off-by: Nir Soffer <nsoffer@redhat.com>
> ---
>   tests/qemu-iotests/iotests.py | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
> index 8f79668435..717b5b652c 100644
> --- a/tests/qemu-iotests/iotests.py
> +++ b/tests/qemu-iotests/iotests.py
> @@ -141,6 +141,12 @@ def qemu_img_create(*args):
>   
>       return qemu_img(*args)
>   
> +def qemu_img_measure(*args):
> +    return json.loads(qemu_img_pipe("measure", "--output", "json", *args))
> +
> +def qemu_img_check(*args):
> +    return json.loads(qemu_img_pipe("check", "--output", "json", *args))
> +

qemu_img_pipe has type hints, so I assume we should add them here too.

Also, qemu-img don't report errors in json format, so in case of error, this 
will raise a problem about something that json can't parse. Probably we need 
better error handling.

Still, for 5.1 it's OK as is I think, so if we are in a hurry:
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

>   def qemu_img_verbose(*args):
>       '''Run qemu-img without suppressing its output and return the exit code'''
>       exitcode = subprocess.call(qemu_img_args + list(args))


--
Best regards,
Vladimir