Re: 1.7.1-1 noacl on samba share has incorrect directory write bit

[Raman Gupta <rocketraman at fastmail dot fm>]

On 01/07/2010 02:50 PM, Corinna Vinschen wrote:
> On Jan  7 13:42, Raman Gupta wrote:
> > On 01/07/2010 01:02 PM, Corinna Vinschen wrote:
> > > On Jan  7 00:39, Raman Gupta wrote:
> > > > "Cygwin ignores filesystem ACLs and only fakes a subset of
> > > > permission bits based on the DOS readonly attribute"
> > >
> > > 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.
> >
> > Wow, isn't that just like Microsoft to reuse an existing read-only
> > bit for something that is completely different semantically!
> >
> > In any case, note that the KB article says that attrib *can* be used
> > to see and modify the value -- as I demonstrated in my previous
> > email.
>
> Sure.  That has nothing to do with what I'm talking about.  While you
> can set and reset the R/O bit on a dir, it doesn't have the *meaning* of
> the directory being R/O.  If Cygwin reports such a directory as being
> read-only from the POSIX perspective, certain functions would have
> strange ideas and return EACCES, for instance.

In the case I am speaking of (a Samba share using the default 
settings), the functions *should* return EACCES, since on the 
server-side the directory is indeed non-writable.

> > > 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.
> >
> > Understood. However, while Samba's use of the read-only bit on
> > directories does differ somewhat from what Windows Explorer expects
> > to use that bit for, it is a valid field and it does provide useful
> > information to the client in the case of noacl Samba mounts.
> >
> > Therefore, what would you think about configuring this via a mount
> > option? For example, a per-mount setting called dro/nodro (directory
>
> That's not the right thing to do, IMHO.  That's what the default "acl"
> mount mode is for.

Unfortunately, acl mode is unusable when in a non-domain environment.

Cheers,
Raman

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