X11 through nullfs under chroot

[Alexander Leidinger]

Quoting Divacky Roman <xdivac02 at stud.fit.vutbr.cz> (Fri, 15 Dec 2006 18:36:45 +0100):

> On Fri, Dec 15, 2006 at 11:15:23AM +0100, Alexander Leidinger wrote:
> > Quoting Timothy Bourke <timbob at bigpond.com> (from Fri, 15 Dec 2006  
> > 15:01:36 +1100):
> > 
> > >I would like to run chroot-ed gentoo-stage3 X client applications on my
> > >host X server through a Unix domain socket.
> > >
> > >It does work:
> > >  * through a tcp socket
> > >  * using a hardlink to /tmp/.X11-unix/X0
> > >
> > >But it does not work via:
> > >  mount -t nullfs /tmp /compat/linux/tmp
> > 
> > This smells like a problem in nullfs regarding sockets (and maybe  
> > other special files). I suggest to tell about this on the filesystem  
> > mailinglist. Don't forget to tell them hich version of FreeBSD you are  
> > using.
> 
> there's a comment in compat/linux/linux_getcwd.c
> 
> /*
>  * XXX Untested vs. mount -o union; probably does the wrong thing.
>  */
> 
> I guess it applies to nullfs too

I did test this with mysql now. You can not connect to a socket when
mounted via nullfs, using a hardlink instead works as expected (tested
with 2 jails).

Bye,
Alexander.

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