linux-kernel - Re: [PATCH] Perf: Use /usr/bin/pager if available for perf pager

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Date:	Tue, 29 May 2012 16:40:30 +0530
From:	Avik Sil <avik.sil@...aro.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...stprotocols.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Perf: Use /usr/bin/pager if available for perf pager

Hi Alan,

On Tuesday 29 May 2012 04:15 PM, Alan Cox wrote:
> On Tue, 29 May 2012 16:05:25 +0530
> Avik Sil<avik.sil@...aro.org>  wrote:
>
>> Some Distributions may lack "less" package being included by default, e.g., Linaro nano rootfs. In those cases use the portable "pager" command instead of "less".
>>
>> Signed-off-by: Avik Sil<avik.sil@...aro.org>
>> ---
>>   tools/perf/util/pager.c |    4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/tools/perf/util/pager.c b/tools/perf/util/pager.c
>> index 1915de2..3322b84 100644
>> --- a/tools/perf/util/pager.c
>> +++ b/tools/perf/util/pager.c
>> @@ -57,6 +57,10 @@ void setup_pager(void)
>>   	}
>>   	if (!pager)
>>   		pager = getenv("PAGER");
>> +	if (!pager) {
>> +		if (!access("/usr/bin/pager", X_OK))
>> +			pager = "/usr/bin/pager";
>> +	}
>
> What is "portable" about /usr/bin/pager ? and what is wrong with just
> doing
>
> export PAGER=/usr/bin/pager
>
This patch basically avoids explicitly setting PAGER=/usr/bin/pager 
before running say 'perf list' on the system where less is not installed.

Regards,
Avik
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