This is the mail archive of the
cygwin
mailing list for the Cygwin project.
Re: BUG: /bin/pwd -P doesn't expand all symlinks
- From: Andrey Repin <anrdaemon at yandex dot ru>
- To: Mark O'Keefe <mark_okeefe at mac dot com>, cygwin at cygwin dot com
- Date: Fri, 23 Oct 2015 17:53:17 +0300
- Subject: Re: BUG: /bin/pwd -P doesn't expand all symlinks
- Authentication-results: sourceware.org; auth=none
- References: <A209F3EB-2FC6-42AB-A4E0-B5A88C53DF4A at mac dot com>
- Reply-to: cygwin at cygwin dot com
Greetings, Mark O'Keefe!
> While using /bin/pwd -P to expand directories to get the absolute,
> non-symlinked version of the directory I discovered that this doesn't work
> on Cygwin as I believe it is meant to work.
> $ cd /tmp
> $ /bin/pwd -P
> /tmp
> $ ln -s /home .
> $ cd home
> $ /bin/pwd -P
> /home
> $ pwd
> /tmp/home
> $ mkdir dummy
> $ cd dummy
> $ pwd
> /tmp/home/dummy
> $ /bin/pwd -P
> /tmp/home/dummy
> NOTE: That last command should have returned "/home/dummy". It hasn't
> expanded the parent symbolic link as you would have expected it to do.
> For what I'm doing I need the physical path, not the symbolic path (which is what the -P is meant to provide).
> Please confirm if I'm correct in my understanding? I've tested this on
> Ubuntu and it works as I'd expect it...
> Now having to create an alternative approach to get the correct answer
> while I wait for this to be fixed (assuming it is a bug as I believe it is).
> Thanks in advance for any help in resolving this.
There's some juju with native symlink expansion going on. I vaguely recall
that it was done for speed. But the results really seems non-expected.
C:\arc is a symlink to the \\daemon1\arc shared directory.
$ cd /c/arc/
anrdaemon@daemon2:/c/arc
$ /bin/pwd.exe -P
//DAEMON1/arc
anrdaemon@daemon2:/c/arc
$ /bin/readlink.exe -fe .
//DAEMON1/arc
All is well.
anrdaemon@daemon2:/c/arc
$ cd images/
anrdaemon@daemon2:/c/arc/images
$ /bin/pwd.exe -P
/c/arc/images
anrdaemon@daemon2:/c/arc/images
$ readlink -fe .
/c/arc/images
Not expected. But here we are going to real surprise:
anrdaemon@daemon2:/c/arc/images
$ readlink -fe $(pwd)
//DAEMON1/arc/images
--
With best regards,
Andrey Repin
Friday, October 23, 2015 17:46:32
Sorry for my terrible english...
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple