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From: Ken Brown <kbrown AT cornell DOT edu>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Stumbled upon relative name resolution across symlinks
Date: Fri, 2 Nov 2018 12:15:34 +0000
Message-ID: <17c3c217-0b57-2976-a101-777ccf0e135b@cornell.edu>
References: <123348672 DOT 20181102013908 AT yandex DOT ru>
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On 11/1/2018 6:39 PM, Andrey Repin wrote:
> Greetings, All!
> 
> $ pwd
> /home/anrdaemon/Documents/NIX/CA-tutorial/test
> 
> $ ls -ld bin ca-profile
> lrwxrwxrwx 1 anrdaemon None  61 ноя  2 01:15 bin -> /home/anrdaemon/Documents/NIX/CA-tutorial/svn-working/scripts
> -rwx--x--x 1 anrdaemon None 588 дек 24  2017 ca-profile
> 
> $ cat bin/../ca-profile
> cat: bin/../ca-profile: No such file or directory
> 
> $ cat $( realpath -Le "bin/../ca-profile" )
> # @version $Id: ca-profile 82 2014-02-08 05:24:12Z anrdaemon $
> ...
> 
> In simpler words, the bin directory is symlinked from elsewhere.
> realpath -Le resolves correctly, but all other filesystem functions fail.

I might be misunderstanding you, but are you saying that you think 'bin/..' 
should resolve to the current working directory?  This is not what Posix says. 
See http://pubs.opengroup.org/onlinepubs/9699919799/, starting at "If a symbolic 
link is encountered during pathname resolution...".  The reason you got what you 
wanted using 'realpath -L' is that the -L option specifically asks for that:

$ man realpath
[...]
        -L, --logical
               resolve '..' components before symlinks

Ken

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