Re: [Qemu-devel] [PATCH] iotests: Require Python 3.5 or later

[John Snow <jsnow@redhat.com>]

On 9/18/19 4:55 AM, Kevin Wolf wrote:
> Running iotests is not required to build QEMU, so we can have stricter
> version requirements for Python here and can make use of new features
> and drop compatibility code earlier.
> 
> This makes qemu-iotests skip all Python tests if a Python version before
> 3.5 is used for the build.
> 
> Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>   tests/qemu-iotests/check | 14 +++++++++++++-
>   1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
> index 875399d79f..a68f414d6c 100755
> --- a/tests/qemu-iotests/check
> +++ b/tests/qemu-iotests/check
> @@ -633,6 +633,13 @@ then
>       export SOCKET_SCM_HELPER="$build_iotests/socket_scm_helper"
>   fi
>   
> +# Note that if the Python conditional here evaluates True we will exit
> +# with status 1 which is a shell 'false' value.
> +python_usable=false
> +if ! $PYTHON -c 'import sys; sys.exit(sys.version_info >= (3,5))'; then
> +    python_usable=true
> +fi
> +

Do we want this as a temporary fix only until we can stipulate the same 
version in the configure file?

If so, leaving a comment with "python2" in it anywhere will help locate 
this later.

>   default_machine=$($QEMU_PROG -machine help | sed -n '/(default)/ s/ .*//p')
>   default_alias_machine=$($QEMU_PROG -machine help | \
>      sed -n "/(alias of $default_machine)/ { s/ .*//p; q; }")
> @@ -809,7 +816,12 @@ do
>           start=$(_wallclock)
>   
>           if [ "$(head -n 1 "$source_iotests/$seq")" == "#!/usr/bin/env python" ]; then
> -            run_command="$PYTHON $seq"
> +            if $python_usable; then
> +                run_command="$PYTHON $seq"
> +            else
> +                run_command="false"
> +                echo "Unsupported Python version" > $seq.notrun
> +            fi
>           else
>               run_command="./$seq"
>           fi
> 

If you agree with my suggestion:

Reviewed-by: John Snow <jsnow@redhat.com>

If you don't, that's, like, your opinion, man.