Re: [PATCH 2/2] iotests/149: Skip on unsupported ciphers

[Hanna Reitz <hreitz@redhat.com>]

On 17.11.21 16:01, Hanna Reitz wrote:
> Whenever qemu-img or qemu-io report that some cipher is unsupported,
> skip the whole test, because that is probably because qemu has been
> configured with the gnutls crypto backend.
>
> We could taylor the algorithm list to what gnutls supports, but this is
> a test that is run rather rarely anyway (because it requires
> password-less sudo), and so it seems better and easier to skip it.  When
> this test is intentionally run to check LUKS compatibility, it seems
> better not to limit the algorithms but keep the list extensive.
>
> Signed-off-by: Hanna Reitz <hreitz@redhat.com>
> ---
>   tests/qemu-iotests/149 | 23 ++++++++++++++++++-----
>   1 file changed, 18 insertions(+), 5 deletions(-)
>
> diff --git a/tests/qemu-iotests/149 b/tests/qemu-iotests/149
> index 328fd05a4c..adcef86e88 100755
> --- a/tests/qemu-iotests/149
> +++ b/tests/qemu-iotests/149
> @@ -230,6 +230,18 @@ def create_image(config, size_mb):
>           fn.truncate(size_mb * 1024 * 1024)
>   
>   
> +def check_cipher_support(output):
> +    """Check the output of qemu-img or qemu-io for mention of the respective
> +    cipher algorithm being unsupported, and if so, skip this test.
> +    (Returns `output` for convenience.)"""
> +
> +    if 'Unsupported cipher algorithm' in output:
> +        iotests.notrun('Unsupported cipher algorithm '
> +                       f'{config.cipher}-{config.keylen}-{config.mode}; '

Oops.  Just when I sent this I realized that during refactoring (putting 
this code into its own function) I forgot to pass `config` as a parameter.

Didn’t notice that because...  It seems to work just fine despite 
`config` not being defined here?  Python will forever remain a black box 
for me...

Hanna

> +                       'consider configuring qemu with a different crypto '
> +                       'backend')
> +    return output
> +