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

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Date: Mon, 1 Jul 2024 13:40:09 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Roman Storozhenko <romeusmeister@...il.com>
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, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3] cpupower: Make help command available for custom
 install dir

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?

thanks,
-- Shuah