X-Spam-Check-By: sourceware.org
From: Jonathan Lennox <lennox AT cs DOT columbia DOT edu>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <17882.22803.479825.172122@metro-north.cs.columbia.edu>
Date: Mon, 19 Feb 2007 21:12:35 -0500
To: ericblake AT comcast DOT net (Eric Blake)
Cc: cygwin AT cygwin DOT com
Subject: Re: Surprising results (ls: no such file or directory) with managed mounts
In-Reply-To: <022020070054.14241.45DA46CD0000EA95000037A122007503300A050E040D0C079D0A@comcast.net>
References: <022020070054 DOT 14241 DOT 45DA46CD0000EA95000037A122007503300A050E040D0C079D0A AT comcast DOT net>
X-Mailer: VM 7.19 under Emacs 20.7.1
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Id: <cygwin.cygwin.com>
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

On Tuesday, February 20 2007, "Eric Blake" wrote to "Jonathan Lennox, cygwin AT cygwin DOT com" saying:

> > Cygwin managed mounts give surprising (to me) results if a filename that's
> > not in its canonical form manages to get below the managed mountpoint:
> 
> The real fix, which I've mentioned before, would be
> altering rename() to fail with EXDEV when renaming
> files across managed mount points.  But as I don't
> have copyright assignment in place for cygwin1.dll,
> I'm relying on someone else to write such a patch.
> In the meantime, just don't do that.

True, but these non-canonical filenames can also arise if you do "mount -f
-o managed EXISTING-WIN-DIR".  The "just don't do that" argument also
applies there, of course, but that's an idiom used by many pre-cygport
package build scripts.  (Cygport leaves off the -f, avoiding the problem.)

And, of course, any non-Cygwin program writing to the managed directory can
create file names not in the canonical form.

-- 
Jonathan Lennox
lennox at cs dot columbia dot edu

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/