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Subject:	Re: cygpath -w converts relative paths to absolute windows paths
To:	cygwin AT cygwin DOT com
References:	<10eb657d-a00b-1609-a9b9-6373092c1ac1 AT polyhack DOT io> <357614277 DOT 20170207183005 AT yandex DOT ru> <eecf1899-0aa3-6344-b88c-e5fe9e01bc90 AT towo DOT net> <1995347138 DOT 20170208135417 AT yandex DOT ru> <f1e11933-c45d-aec8-6720-0809265729d6 AT towo DOT net>
From:	cyg Simple <cygsimple AT gmail DOT com>
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Date:	Sat, 11 Feb 2017 16:28:09 -0500
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On 2/8/2017 5:42 PM, Thomas Wolff wrote:
> Hi Andrey,
> 
> Am 08.02.2017 um 11:54 schrieb Andrey Repin:
>> Greetings, Thomas Wolff!
>>
>>> Am 07.02.2017 um 16:30 schrieb Andrey Repin:
>>>> Greetings, Roger Qiu!
>>>>
>>>>> I've found that `cygpath --windows '../` will give back an absolute
>>>>> windows path.
>>>>> ...
>>>> ".." is a special path, that can't be safely converted.
>>> How is the special meaning of ".." so much different in Windows than in
>>> Cygwin/Linux/POSIX that it could not be mapped?
>>> Things like dir .., cd .., type ..\sub\file all work comparably.
>> Comparable? May be. Predictable?
>> https://bugs.php.net/bug.php?id=73797
> I don't know what __DIR__ is supposed to mean in PHP. Anyway, handling

It's simply a constant of the directory for the file in which __DIR__
appears.  The constant has a namespace relative to the file.

> ".." is not predictable even within Linux/Cygwin, you could see
> something like:
>> ls dir1/file
> dir1/file
>> cd dir2
>> ls ../dir1/file
> No such file or directory
> 
> (if dir2 is a link), or can have surprising effects of cd vs. cd -P.
> I don't see how that should exclude ".." from being transformed to ".."
> by cygpath -w, even if the result may be somewhat unexpected in some
> border cases (which I haven't seen yet).

I agree.

-- 
cyg Simple

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