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Date: Mon, 16 Sep 2013 11:12:29 -0400
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: cygpath -m behaviour change
Message-ID: <20130916151229.GA4411@ednor.casa.cgf.cx>
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User-Agent: Mutt/1.5.20 (2009-06-14)

On Mon, Sep 16, 2013 at 10:56:37AM +0100, David Griffiths wrote:
>> Yes, that's exactly right, assuming that 'boo' doesn't exist.
>
>Hi, it happens even if boo does exist.

Not for me.

% mkdir /boo
norton[~]
$ ls /boo/..
bin           cygwin               dev   localhome     proc   usr
boo           cygwin.bat           etc   netrel        sbin   var
cygdrive      cygwin.ico           home  netrel.build  share
cygmount.bat  Cygwin-Terminal.ico  lib   netrel.inst   tmp
norton[~]
% cygpath -m /boo/..
D:/cygwin

It doesn't work if boo is not a directory but that is as expected.

>To put it in context, the
>script in question was attempting to determine the current directory:
>
>CURRENT_DIR=$(cygpath -ma "${0}"/../)
>
>(I didn't write this script but I assume they did this for performance reasons.)

>But anyway, as you can see ${0} always exists.
>
>I looked at the other thread but don't see an immediate connection as
>that was checking for non-existing path members.

nonexistent or non-directory.  We've fixed a bug in later versions of Cygwin
which this script relied on.

It could be rewritten as:

CURRENT_DIR=$(cygpath -ma "$(dirname $0)")

(assuming that CURRENT_DIR isn't really trying to find the cwd, in which
case the script is just wrong to begin with)

cgf

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