linux-kernel - Re: [PATCH v3] cpupower: Make help command available for custom install dir

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Message-ID: <CALsPMBPkE=CCTgm8UcsdL7qEG+1u1H8NFYYTJvEMK3uXvg97Ng@mail.gmail.com>
Date: Tue, 2 Jul 2024 09:40:19 +0200
From: Roman Storozhenko <romeusmeister@...il.com>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: Thomas Renninger <trenn@...e.com>, Shuah Khan <shuah@...nel.org>, 
	Javier Carrasco <javier.carrasco.cruz@...il.com>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] cpupower: Make help command available for custom
 install dir

On Mon, Jul 1, 2024 at 9:40 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
>
> On 6/29/24 04:48, Roman Storozhenko wrote:
> > On Fri, Jun 28, 2024 at 9:45 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
> >>
> >> On 6/28/24 05:30, Roman Storozhenko wrote:
> >>> On Thu, Jun 27, 2024 at 7:33 PM Shuah Khan <skhan@...uxfoundation.org> wrote:
> >>>>
> >>>> On 6/27/24 01:49, Roman Storozhenko wrote:
> >>>>> When the 'cpupower' utility installed in the custom dir, it fails to
> >>>>> render appropriate help info for a particular subcommand:
> >>>>> $ LD_LIBRARY_PATH=lib64/ bin/cpupower help monitor
> >>>>> with error message like 'No manual entry for cpupower-monitor.1'
> >>>>> The issue is that under the hood it calls 'exec' function with
> >>>>> the following args: 'man cpupower-monitor.1'. In turn, 'man' search
> >>>>> path is defined in '/etc/manpath.config'. Of course it contains only
> >>>>> standard system man paths.
> >>>>> Make subcommands help available for a user by setting up 'MANPATH'
> >>>>> environment variable to the custom installation man pages dir. That
> >>>>> variable value will be prepended to the man pages standard search paths
> >>>>> as described in 'SEARCH PATH' section of MANPATH(5).
> >>>>
> >>>> What I am asking you is what happens when you set the MANPATH before
> >>>> running the command?
> >>>
> >>> It adds the custom search path to the beginning of the MANPATH variable.
> >>> I tested this case. All works as expected.
> >>>
> >>
> >> Let's try again. What happens if you run the command with MANPATH set and
> >> exported and then run the command. Can you send the output?
> >
> > hedin@...top:~/prj/cpupower/install/usr$ echo $MANPATH
> > /tmp/
> > hedin@...top:~/prj/cpupower/install/usr$ LD_LIBRARY_PATH=lib64/
> > bin/cpupower help monitor
> > ...................
> > man output
> > ...................
> > hedin@...top:~/prj/cpupower/install/usr$ echo $MANPATH
> > /tmp/
> > hedin@...top:~/prj/cpupower/install/usr$
> >
>
> Is this with your patch or mainline? Can you give cut and paste
> the man output here for the mainline coupower without your patch?

The above output is from my patch.
This is the output from the mainline:
hedin@...top:~/prj/cpupower/install/usr$ sudo LD_LIBRARY_PATH=lib64/
bin/cpupower help monitor
[sudo] password for hedin:
No manual entry for cpupower-monitor
hedin@...top:~/prj/cpupower/install/usr$ echo $MANPATH
/tmp/
hedin@...top:~/prj/cpupower/install/usr$


>
> thanks,
> -- Shuah
>


-- 
Kind regards,
Roman Storozhenko