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Subject: Re: error in "cygpath" behavior
To: cygwin AT cygwin DOT com
References: <5b88c605 DOT 1c69fb81 DOT f383 DOT a0b6 AT mx DOT google DOT com> <20180831085734 DOT GF6350 AT calimero DOT vinschen DOT de> <5f5472d0-bdee-56d0-7549-41e83d48e6bc AT gmail DOT com> <ad34f7a7-ec71-de69-b2d2-711c2e8d61b0 AT redhat DOT com>
From: Thomas Wolff <towo AT towo DOT net>
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Date: Sat, 1 Sep 2018 09:17:21 +0200
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Am 31.08.2018 um 22:05 schrieb Eric Blake:
> On 08/31/2018 02:48 PM, cyg Simple wrote:
>
>>
>> Don't forget the possibility that '..' points to a symlink which Windows
>> will not understand.
>>
>> $ mkdir -p /foo/baz
>> $ ln -s /foo /bar
>> $ cd /bar/baz
>> $ cygpath -w ..
>
> Except .. never points to a symlink.  It always points to the physical 
> directory that contains the current directory (that is, /foo, not 
> /bar).  The shell can maintain a notion of a logical current directory 
> (based on whether you use 'set -P' for physical or 'set +P' for 
> logical; where bash defaults to +P), and in that mode, 'cd ..' behaves 
> logically (acting as though you are now in /bar, rather than actually 
> changing you to /foo).  But that still doesn't change the fact that 
> '..' in file name resolution never resolves to a symlink, because the 
> shell is merely rewriting your ".." to avoid passing it on to the 
> syscalls, rather than the syscalls actually knowing about logical mode.
As a side-note, this is also the reason that you may be facing apparent 
inconsistency with path name completion,
like `ls ../[TAB]` suggesting you files and directories that do not 
exist once you run the command.
This is not cygwin-specific.

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