X-Spam-Check-By: sourceware.org
Date: Wed, 11 Jan 2006 22:53:54 -0500 (EST)
From: Igor Peshansky <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Matthew Pittman <m DOT pittman AT pks DOT com DOT au>
cc: cygwin AT cygwin DOT com
Subject: RE: chmod not working with ntsec set
In-Reply-To: <ALEGJCNFKFCKMFOAMPNFCEDPCAAA.m.pittman@pks.com.au>
Message-ID: <Pine.GSO.4.63.0601112243110.20806@access1.cims.nyu.edu>
References: <ALEGJCNFKFCKMFOAMPNFCEDPCAAA DOT m DOT pittman AT pks DOT com DOT au>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
Content-ID: <Pine DOT GSO DOT 4 DOT 63 DOT 0601112243112 DOT 20806 AT access1 DOT cims DOT nyu DOT edu>
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
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

Ugh, top-posting...  Reformatted.

On Thu, 12 Jan 2006, Matthew Pittman wrote:

> -----Original Message-----
> From: cygwin-owner AT XXXXXX DOT XXX [mailto:cygwin-owner AT XXXXXX DOT XXX]On Behalf Of Igor Peshansky
> Sent: Thursday, 12 January 2006 12:54 PM
> To: Matthew Pittman
> Cc: cygwin AT XXXXXX DOT XXX

<http://cygwin.com/acronyms/#PCYMTNQREAIYR>.  Thanks.

> Subject: Re: chmod not working with ntsec set
>
> > On Thu, 12 Jan 2006, Matthew Pittman wrote:
> >
> > > I know this is a dumb question but I have made genuine efforts to
> > > understand what I'm doing wrong and I'm still missing the point.
> > > Sorry for wasting your time.
> > >
> > > I've installed cygwin under WXP in a domain.  When I first started
> > > bash I got a warning about groups but it said that I could safely
> > > ignore it so I did.  Of course now I can't remember exactly what it
> > > was but I think it was something about creating mkgroup-l-d because
> > > it couldn't create the correct group.
> > >
> > > I pressed on regardless but I found I couldn't get chmod to work so
> > > I searched the documentation, web and mailing list archives and
> > > found that I should set the CYGWIN environment variable to "ntsec".
> > > I also noted that this should now be the default anyway but I set it
> > > anyway and it hasn't solved the problem.
> > >
> > > 	$ echo $CYGWIN
> > > 	ntsec
> > >
> > > 	$ chmod -v u+x .bashrc
> > > 	mode of `.bashrc' changed to 0744 (rwxr--r--)
> > >
> > > 	$ ls -l .bashrc
> > > 	-rw-r--r--  1 matt mkgroup-l-d 316 Jan 11 13:39 .bashrc
> > >
> > > I also note that I have write permission to the folder.
> > > 	drwxr-xr-x  1 matt mkgroup-l-d    4096 Jan 11 17:12 .
> > > Can anyone put me out of my misery?  Thanks in advance,
> >
> > This is not a dumb question, this is an (incomplete) problem report.
> > It would be very helpful if you read and followed the Cygwin problem
> > reporting guidelines at <http://cygwin.com/problems.html> --
> > particularly the part about attaching (as an uncompressed text
> > *attachment*) the output of "cygcheck -svr" on your machine.
> >
> > In the absence of that information, all I can do is venture a couple of
> > WAGs:
> >
> > 1) you probably have two users named "matt" on your machine -- one
> > local, and one domain.  The file is owned by the domain user, while
> > you're logged in as a local one, or vice versa.  Thus, chmod just
> > doesn't have the access rights to change permissions.
> >
> > 2) your file is on a FAT/FAT32 partition.  Please read the description
> > of the "ntea" option at
> > <http://cygwin.com/cygwin-ug-net/using-cygwinenv.html>. This
> > information also used to be in the NTSEC part of the User's Guide at
> > <http://cygwin.com/cygwin-ug-net/ntsec.html> (and, in fact, the "ntea"
> > description has a link to it), but it doesn't seem to be there
> > anymore. In short, file permissions don't work on FAT (without special
> > setup) and FAT32 partitions (at all).
> >
> > 3) building on 2) above, your file could be on a network share that a)
> > doesn't support permissions, or b) is a Samba share but you don't have
> > "smbntsec" turned on (I forget whether it's on by default, and am too
> > lazy to look at the code at the moment).
> >
> > Note that these are WAGs, due to lack of exact information.
> > HTH,
>
> Thanks very much Igor,
>
> Attached is the output of cygcheck -s -v -r > cygcheck.out

Which looks ok, FWIW, and confirms that you're a domain user and that you
have network drives.

> I have also established that both C: and X: are NTFS partitions but X:
> is a network share.  chmod works on C: but not on X:.

Your best bet is to add the "smbntsec" option to your CYGWIN variable and
see if this solves your problem.  If that doesn't help, then your share
does not support ACLs for some reason (and thus permissions will not
work).

> There are no local accounts named matt but I note that creating a file
> under my login account on c: results in the following undefined group:
>
> 420 -rwx------+  1 matt ????????    616236 Jan 12 11:48 cygwin-ug-net.pdf
>
> I'm guessing that this has something to do with cygwin's need to create
> the mkgroup-l-d group and that it can't work out what group the user
> matt is in? But this is a WAG too.

What it means is described in the last section of the NTSEC document at
<http://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-ids>.  You may want to
run "mkgroup -l -d >> /etc/group" to update your groups (be aware that
this may take a long time in large domains).

> Any ideas where I go from here?

If the "smbntsec" setting doesn't help, I'm not aware of any solution.
Perhaps Corinna (Cygwin project co-leader and ntsec expert) will chime in
with more suggestions.
	Igor
-- 
				http://cs.nyu.edu/~pechtcha/
      |\      _,,,---,,_	    pechtcha AT cs DOT nyu DOT edu | igor AT watson DOT ibm DOT com
ZZZzz /,`.-'`'    -.  ;-;;,_		Igor Peshansky, Ph.D. (name changed!)
     |,4-  ) )-,_. ,\ (  `'-'		old name: Igor Pechtchanski
    '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!

"Las! je suis sot... -Mais non, tu ne l'es pas, puisque tu t'en rends compte."
"But no -- you are no fool; you call yourself a fool, there's proof enough in
that!" -- Rostand, "Cyrano de Bergerac"

--
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/