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Date: Tue, 10 Feb 2009 09:53:10 +0000
From: Fergus <fergus AT bonhard DOT uklinux DOT net>
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CC: Fergus <fergus AT bonhard DOT uklinux DOT net>
Subject: Re: How does one find "cygdrive path" in a Win ".bat" file
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This might not be quite what you are after, but possibly will provide a 
starting point. My Cygwin installation is mounted in the root directory 
of a portable drive so, depending on where I am, the drive might end up 
being D: or F: or G: or M: or ... The lines following are the first few 
lines in a .cmd file located at \ that will correctly implement commands 
under /bin (or anywhere else under /) because the correct drivename is 
correctly identified whether you start the .cmd file (a) from a Command 
Prompt (b) using Start -> Run -> .. or (c) by double-clicking in Explorer.

(It's to allow for both (b) and (c) that the rather awkward pair of if() 
commands are needed.)

set DOS_CMD=%0
set CWD=%CD%
set DN=%CWD:~0,2%
if (%DOS_CMD:~1,1%)==(:) set DN=%DOS_CMD:~0,2%
if (%DOS_CMD:~2,1%)==(:) set DN=%DOS_CMD:~1,2%
%DN%\bin\{command}

More generally, a user's Cygwin installation might be located on a 
portable drive under \dir1\dir2\dir3\.. and then in general the startup 
command file will need to "know" or "discover" not just the drivename 
but the pathname: ie CWD.

NB I have not found a foolproof way of doing this other than by locating 
the command file at \dir1\dir2\dir3\.. (i.e. at / with respect to the 
Cygwin installation) and this might be too specialised for what you want 
to do, but if your quest is more general than this, I think

 > you have to rely on external data and heuristics

as earlier suggested.

Fergus



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