Re: [PATCH] scripts: improve error from qemu-trace-stap on missing 'stap'

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

On 6/12/24 12:45, Daniel P. Berrangé wrote:
> If the 'stap' binary is missing in $PATH, a huge trace is thrown
> 
>    $ qemu-trace-stap list /usr/bin/qemu-system-x86_64
>    Traceback (most recent call last):
>    File "/usr/bin/qemu-trace-stap", line 169, in <module>
>    main()
>    File "/usr/bin/qemu-trace-stap", line 165, in main
>    args.func(args)
>    File "/usr/bin/qemu-trace-stap", line 83, in cmd_run
>    subprocess.call(stapargs)
>    File "/usr/lib64/python3.12/subprocess.py", line 389, in call
>    with Popen(*popenargs, **kwargs) as p:
>    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>    File "/usr/lib64/python3.12/subprocess.py", line 1026, in {}init{}
>    self._execute_child(args, executable, preexec_fn, close_fds,
>    File "/usr/lib64/python3.12/subprocess.py", line 1955, in _execute_child
>    raise child_exception_type(errno_num, err_msg, err_filename)
>    FileNotFoundError: [Errno 2] No such file or directory: 'stap'
> 
> With this change the user now gets
> 
>    $ qemu-trace-stap list /usr/bin/qemu-system-x86_64
>    Unable to find 'stap' in $PATH
> 
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>   scripts/qemu-trace-stap | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>