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Date: Thu, 7 Jan 2010 19:02:14 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: 1.7.1-1 noacl on samba share has incorrect directory write bit
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On Jan  7 00:39, Raman Gupta wrote:
> Well... yes -- at least in this case. As per the documentation
> (http://www.cygwin.com/cygwin-ug-net/using.html#mount-table):
> 
> "Cygwin ignores filesystem ACLs and only fakes a subset of
> permission bits based on the DOS readonly attribute"
> 
> On the server:
> 
> root AT smserver foo]# ls -ald bar baz
> dr-xr-sr-x. 2 root agroup 4096 2007-04-21 23:23 bar
> drwxrwsr-x. 2 root agroup 4096 2007-04-21 23:23 baz
> 
> Since the default behavior of Samba is to map the DOS read-only flag
> as per the write bits (http://www.samba.org/samba/docs/man/manpages-3/smb.conf.5.html#MAPREADONLY),
> the write bits carry over to the DOS readonly attribute on the
> share. This can be verified via the DOS attrib command on the
> client:
> 
> Raman Gupta AT client /mnt/shar/foo
> $ attrib bar
>      R     \\smserver\smshare\foo\bar
> 
> Raman Gupta AT client /mnt/shar/foo
> $ attrib baz
>            \\smserver\smshare\foo\baz
> 
> and yet, Cygwin reports owner write bit set in both cases:
> 
> Raman Gupta AT client /mnt/shar/foo
> $ ls -ald bar baz
> drwxr-xr-x 1 Raman Gupta None 0 2007-04-21 23:23 bar
> drwxr-xr-x 1 Raman Gupta None 0 2007-04-21 23:23 baz
> 
> Therefore, it appears that cygwin is following its own documentation
> for files but not for directories.

No, it's a bit more tricky.  FAT filesystems, which are the role model
for noacl filesystems don't know something like a R/O directory.  The
DOS R/O bit on a directory does NOT mean the directory is R/O.  Rather,
it only means that the folder is some sort of special folder.  For some
better description, see http://support.microsoft.com/kb/326549.

Therefore the fault is not on Cygwin's side, but on Samba's side to use
the DOS R/O bit for something different than Windows uses it on
directories.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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