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

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Message-ID: <20140731122621.GV7831@kernel.org>
Date:	Thu, 31 Jul 2014 09:26:21 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...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 '/'

Em Thu, Jul 31, 2014 at 01:25:52PM +0900, Namhyung Kim escreveu:
> Hi Arnaldo,
> 
> On Wed, 30 Jul 2014 17:55:21 -0300, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Jul 30, 2014 at 12:19:32PM -0300, Arnaldo Carvalho de Melo escreveu:
> >> Em Wed, Jul 30, 2014 at 08:52:36AM +0900, Namhyung Kim escreveu:
> >> > I also thought about that way first but changed my mind to the current
> >> > approach because I don't want to change current behavior.
> >> 
> >> > I worried about the common case which has empty symfs.  By your patch,
> >> > it makes a pathname absolute even with an empty symfs - I can see most
> >> > filenames are already absolute paths but I'm not 100% sure it's always
> >> > the case.
> >> 
> >> Yeah, after doing some research on the tools/perf/ 'git log' I got your point,
> >> we can't add the / after symfs usages when it is "", i.e. we need something
> >> like:

> >> [acme@zoo linux]$ python
> >> >>> import os
> >> >>> symfs = ""
> >> >>> os.path.join(symfs, "dso_path")
> >> 'dso_path'
> >> >>> symfs = "/home/acme/embedded_device_dsos"
> >> >>> os.path.join(symfs, "dso_path")
> >> '/home/acme/embedded_device_dsos/dso_path'

> >> I'll try and get that in place.

> > Ok, the patch below should implement it just like above, if Minchan
> > could please retest, I did just minimal testing, will do more later.
 
> 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.

- Arnaldo
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