Message-ID: <906049.55360.qm@web25501.mail.ukl.yahoo.com>
Date: Sat, 25 Sep 2010 12:52:10 +0000 (GMT)
From: Marco Atzeri <marco_atzeri AT yahoo DOT it>
Subject: Re: 1.7.7(0.230/5/3) - Cannot change mode of file, and other permission issues on a Windows fileshare
To: cygwin AT cygwin DOT com
In-Reply-To: <20100924162826.GA25401@calimero.vinschen.de>
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--- Ven 24/9/10, Corinna Vinschen ha scritto:


> On Sep 24 08:49, Keith Christian
> wrote:
> > > Does a call to chmod fail as well? =A0If so, can
> you create an strace of
> > > such a chmod, like this:
> > >
> > > =A0$ touch foo
> > > =A0$ strace -o chmod.trace chmod 444 foo
> > >
> > > and send the chmod.trace file to the list?
> >=20
> >=20
> >=20
> > Thanks, Corinna,
> >=20
> > Yes, I receive "chmod: changing permissions of `foo':
> Permission
> > denied" when executing chmod 444 foo.
>=20
> Here's the problem:
>=20
>  fhandler_base::open: C0000022 =3D NtCreateFile (0x0, E0100,
> \??\Z:\foo, io, NULL, 0, 7, 1, 4000, NULL, 0)
>=20
> Cygwin tries to open the file for writing the control
> information
> requesting WRITE_DAC and WRITE_OWNER access, but the remote
> filesystem
> refuses the request with an "Access denied" status code.
>=20
> I was going to say that we can't do anything against that,
> but then
> it occured to me that this isn't quite right.=A0
> Actually we don't
> need WRITE_OWNER access for the chmod functionality, so
> it's perhaps=20
> still possible to call chmod on that remote filesystem if
> cygwin omits
> the WRITE_OWNER access flag when opening the file.
>=20
> I applied a tiny patch to Cygwin, which only requests
> WRITE_DAC, not
> WRITE_OWNER in calls to chmod.=A0 Please test the next
> developer's
> snapshot from http://cygwin.com/snapshots/ and see if
> it fixes your
> problem.=A0 If you still get "Permission denied", it's
> actually a problem
> of the server which doesn't allow to change the ACL of a
> file via the
> share for some reason.
>=20
>=20
> Corinna
>=20

I noticed on XP SP2, Xserver (1.8.2) crashing on=20
start with snapshot 20100924 while it runs fine=20
with 20100923.
Anyone noticed the same ?

Usual invocation from Menu:
C:\cygwin2\bin\run.exe /usr/bin/bash.exe -l -c /usr/bin/startxwin.exe

Marco


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