GNU bug report logs - #10472
`realpath --relative-to=<path> /` outputs inconsistent trailing slash

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mike Frysinger <vapier <at> gentoo.org>
Subject: bug#10472: closed (Re: bug#10472: `realpath --relative-to=<path>
 /` outputs inconsistent trailing slash)
Date: Wed, 25 Jan 2012 16:56:02 +0000

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Your bug report

#10472: `realpath --relative-to=<path> /` outputs inconsistent trailing slash

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 10472 <at> debbugs.gnu.org.

-- 
10472: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10472
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Pádraig Brady <P <at> draigBrady.com>
To: Mike Frysinger <vapier <at> gentoo.org>
Cc: 10472-done <at> debbugs.gnu.org
Subject: Re: bug#10472: `realpath --relative-to=<path> /` outputs inconsistent
	trailing slash
Date: Wed, 25 Jan 2012 16:55:09 +0000

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On 01/10/2012 10:30 PM, Pádraig Brady wrote:
> On 01/10/2012 09:53 PM, Mike Frysinger wrote:
>> On Tuesday 10 January 2012 15:15:57 Mike Frysinger wrote:
>>> as does these:
>>> 	realpath --relative-to=/ /usr
>>> 	realpath --relative-to=/ /usr/
>>> which is to say, they show:
>>> 	..
>>
>> sorry, typo here ... these actually output:
>> 	../usr
>>
>> i guess that should be just "usr".
>> -mike
> 
> Agreed. python concurs too:
> 
>>>> os.path.relpath(start='/usr',path='/')
> '..'
>>>> os.path.relpath(start='/',path='/usr')
> 'usr'
> 
> Essentially in these edge cases the relative paths
> printed are valid, but not canonicalised.
> 
> I'll fix it up.

Proposed fix attached.

cheers,
Pádraig.

[relpath-edge-cases.diff (text/plain, attachment)]

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From: Mike Frysinger <vapier <at> gentoo.org>
To: bug-coreutils <at> gnu.org
Subject: `realpath --relative-to=<path> /` outputs inconsistent trailing slash
Date: Tue, 10 Jan 2012 15:15:57 -0500

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first some examples that look fine ...

these all output the same thing:
	realpath --relative-to=/usr /usr/bin
	realpath --relative-to=/usr/ /usr/bin
	realpath --relative-to=/usr /usr/bin/
	realpath --relative-to=/usr/ /usr/bin/
which is to say, they show:
	bin

as does these:
	realpath --relative-to=/usr/bin /usr
	realpath --relative-to=/usr/bin/ /usr
	realpath --relative-to=/usr/bin /usr/
	realpath --relative-to=/usr/bin/ /usr/
which is to say, they show:
	..

as does these:
	realpath --relative-to=/ /usr
	realpath --relative-to=/ /usr/
which is to say, they show:
	..

however, if the last argument is just the root path:
	realpath --relative-to=/usr /
	realpath --relative-to=/usr/ /
we end up with a trailing slash:
	../

for consistency, i don't think that should be the case

(reported by Ulrich Müller via https://bugs.gentoo.org/398339)
-mike

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