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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>
From: Thomas Wolff <towo AT towo DOT net>
Message-ID: <f1e11933-c45d-aec8-6720-0809265729d6@towo.net>
Date: Wed, 8 Feb 2017 23:42:23 +0100
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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 
".." 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).
------
Thomas

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