bug#10257: 23.3.1 Cygwin: network drives - file is write protected (false positive)

[Ken Brown]

On 12/14/2011 8:10 AM, Eli Zaretskii wrote:
> > Date: Wed, 14 Dec 2011 07:55:07 -0500
> > From: Ken Brown<kbrown@cornell.edu>
> > CC: 10257@debbugs.gnu.org, Jari Aalto<jari.aalto@cante.net>
> >
> > As I understand it, this is a filesystem problem: Samba returns a
> > fake SID to Windows, so Cygwin can't determine the correct uid/gid.
> > Jari, you were already told on the Cygwin list how to work around
> > this problem.  Why not just do it?
>
> Either that, or make euidaccess/check_writable return success in such
> cases.

I don't know how to determine what "such cases" are.  In the case at 
hand, Jari has a network filesystem that is configured in such a way 
that the uid/gid of a file can't be determined by standard system calls. 
 As explained on the Cygwin list, he can set up his /etc/passwd and 
/etc/group to work around this.  [He has to map the fake SID returned by 
Samba to a real one.]  If he doesn't want to do that, I think it would 
clearly be wrong for euidaccess to return success.

Maybe check_writable could be a little more lenient, but I'm not sure 
what the implications of that would be.

Ken