Re: [PATCH] rtla: Fix -t/--trace[=file]

From: Daniel Bristot de Oliveira
Date: Fri May 10 2024 - 04:10:59 EST


On 5/8/24 23:21, John Kacur wrote:
> Normally with a short option we don't provide an equals sign like this
> -tfile.txt
> -t file.txt
>
> But we do provide an equals sign with the long option like this
> --trace=file.txt
>
> Also, a good parser should work with a space instead of an equals sign
> --trace file.txt
>
> Most of these are broken!

So, it is set to work _only_ with =file. It would be better to have
it more robust... yes.

> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -tfile.txt
> Saving trace to ile.txt
> File name truncated
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t file.txt
> Saving trace to timerlat_trace.txt
> Default file name used instead of the requested one.
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t=file.txt
> Saving trace to file.txt
> This works, but people normally don't use '=' with a short option
>
> /rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace=file.txt
> Saving trace to ile.txt
> File name truncated
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace file.txt
> timerlat_trace.txt
> Default file name used instead of the requested one.
>
> After the fix
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -tfile.txt
> Saving trace to file.txt
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t file.txt
> Saving trace to file.txt
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t=file.txt
> Saving trace to file.txt
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace=file.txt
> Saving trace to file.txt
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace file.txt
> Saving trace to file.txt
>
> I also tested -t and --trace without providing a file name both as the
> last requested option and with a following long and short option
>
> For example
>
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t -u
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace -u
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace
>
> And all correctly do Saving trace to timerlat_trace.txt as expected
>
> This fix is applied to both timerlat top and hist
> and to osnoise top and hist.

Ok, code wise it is fine. But it is still missing the changes for the --help
messages and man pages. Would you mind addressing them?

For instance, removing the need for the =...

s/
-t/--trace[=file]: save the stopped trace to [file|timerlat_trace.txt]
/
-t/--trace [file]: save the stopped trace to [file|timerlat_trace.txt]
/

Also, for the man page we will have to move the -t option from common_options.rst
to common_timerlat_options.rst and common_osnoise_options.rst to fix this in
man rtla-timerlat-top:

-t, --trace[=file]
Save the stopped trace to [file|osnoise_trace.txt].

(it is pointing to the wrong file)

Thanks!
-- Daniel