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X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Thu, 19 Feb 2004 19:48:33 -0500 (EST)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	"Parker, Ron" <rdparker AT butlermfg DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	Re: Strange symlink and mv interaction
In-Reply-To:	<71A0F7B0F1F4F94F85F3D64C4BD0CCFE05A0400F@bmkc1svmail01.am.mfg>
Message-ID:	<Pine.GSO.4.56.0402191938190.22216@slinky.cs.nyu.edu>
References:	<71A0F7B0F1F4F94F85F3D64C4BD0CCFE05A0400F AT bmkc1svmail01 DOT am DOT mfg>
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On Thu, 19 Feb 2004, Parker, Ron wrote:

> From inside of ~/src/myprojects I did a:
>
> 	mv -- --1.2 ~/tla--escapes--1.2
>
> where "--1.2" was a directory in ~/src/myprojects.  This did not move
> ~/src/myprojects/--1.2 to ~/src/tla--escapes--1.2.  What it did do was move
> it to /cygdrive/c/tla--escapes--1.2.

Tilde expansion is usually done by the shell.  However, judging from the
rest of your message, you meant the above to say

	mv -- --1.2 ../tla--escapes--1.2

More below.

> Here are the pertinent paths:
>
> /			is a binary system mount of	C:\cygwin
> /c			is a binary system mount of	C:\
> /home			is a binary system mount of	C:\home
> ~			is				/home/rdparker
> ~/src			is a directory,			/home/rdparker/src
> ~/src/myprojects	is a symlink to			/c/MyProjects
>
> The symlink is just intended to graft my Windows source into my preferred
> ~/src working location for use with reasonable tools.
>
> It appears that when mv did a ".." from ~/src/myprojects, it actually did a
> .. from /c/MyProjects not from ~/src/myprojects.  Is this the expected
> behavior?

This is the expected behavior.  The symlink takes you to the directory,
but the ".." uses the actual parent directory entry, which points to /c.
If you want this to work seamlessly, create an actual "~/src/myprojects"
directory, and use 'mount' to map /c/MyProjects to
/home/rdparker/src/myprojects.

> I don't have a *nix system handy to check out how .. works with
> symlinked directories.

The above is rather logical if you think about it.  FWIW, it does work the
same way on Linux (not surprisingly).

> I left my laptop at home today and my wife shut off my ssh box at home
> because the fan was scaring her rabbit.  (Hmm... how do small pets
> respond to contact with an Athlon?  I smell hasenpfeffer.  Sorry PETA,
> it's been a _long_ day.)

Just keep the rabbit out of the fan... :-)
	Igor
-- 
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     |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski, Ph.D.
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to the bathroom is a major career booster."  -- Patrick Naughton

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