linux-kernel - Re: [PATCH 1/2] perf tools: Ensure --symfs ends with '/'

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Date:	Fri, 01 Aug 2014 08:38:02 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Minchan Kim <minchan@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 1/2] perf tools: Ensure --symfs ends with '/'

Hi Arnaldo,

On Thu, 31 Jul 2014 09:26:21 -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Jul 31, 2014 at 01:25:52PM +0900, Namhyung Kim escreveu:
>> Are you still against my approach - adding '/' at the end of the symfs
>> string itself?  It seems that mine is simpler and shorter.
>
> Yes, I am.
>
> We are not just concatenating two strings, we are joining two path
> components.
>
> I think it is more clear and elegant to do it as python os.path.join()
> does.

Then I think you also need to care about trailing and leading '/' in the
components so that, say, joining '/home/' and '/namhyung/' can result in
'/home/namhyung/' not '/home///namhyung/'.

Btw, it seems like python's os.path.join() just use latter if it's an
absolute path.

  $ python
  Python 2.7.3 (default, Jul 24 2012, 10:05:38) 
  [GCC 4.7.0 20120507 (Red Hat 4.7.0-5)] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import os.path
  >>> os.path.join('/home/', '/namhyung/')
  '/namhyung/'
  >>> 


Thanks,
Namhyung
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