s3compat system for running s3 components in s4

[Jeremy Allison]

On Thu, Apr 29, 2010 at 10:28:39AM +1000, Andrew Bartlett wrote:
> On Mon, 2010-04-26 at 14:25 +1000, tridge at samba.org wrote:
> > I've been working with Andrew Bartlett on a new approach for more
> > closely integrating Samba3 and Samba4.
> > 
> > The new approach is described is some detail here:
> > 
> >   http://wiki.samba.org/index.php/Samba4/s3compat
> > 
> > Basically, it builds the Samba3 smbd as a shared library, and uses
> > hide_symbols from the waf build (which maps to -fvisibility=hidden on
> > gcc) to prevent symbol conflicts between the s3 and s4 code.
> > 
> > The Samba4 bin/samba binary then links to libs3compatcore.so, and is
> > able to access s3 functions via a thin compatibility layer (in
> > s3compat/s3compat.c).
> 
> What I really like about this proposal is the way it builds on the
> efforts already made like the merged build, the common code and Franky.
> I think this is a really good way to get good, tight integration in a
> polished Samba 4.0 product.  We will not, in this mode, have two
> (possibly different) parsers for linearised formats just to communicate
> and administer the whole server.  I think that's really important - as
> the best junction points may not be places we can linearise well. 
> 
> If everyone is amenable, I hope to convert the auth subsystem in Samba3
> to use some of the structures I developed in Samba4 (just simply because
> I continued to evolve auth/ after I switched my attentions). 
> 
> This will, I hope, allow me to develop a Samba3 auth module that will
> ask Samba4 to complete the authentication.  (Removing the need for a
> passdb.tdb). 

That would be really useful Andrew, thanks ! I'd very much like to
see that code.

Jeremy.