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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>
From: Eric Blake <eblake AT redhat DOT com>
Message-ID: <ad34f7a7-ec71-de69-b2d2-711c2e8d61b0@redhat.com>
Date: Fri, 31 Aug 2018 15:05:19 -0500
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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.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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