Re: [RFC] fix devpts mount behavior

[Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>]

On Mon, Jan 23, 2012 at 04:13:49PM -0800, Linus Torvalds wrote:
> On Mon, Jan 23, 2012 at 4:05 PM, Serge Hallyn
> <serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> wrote:
> >
> > I've been playing for the last week with ways to fix this, and in the
> > end I can see two ways.
> 
> How about a third way:
> 
>  - make "newinstance" mandatory (and "-o newinstance" is a no-op) and
> forget about the whole issue.
> 
>  - if you really want to remount the old global one, you have to use a
> bind mount of that original mount instead.
> 
> There may be some subtle reason why the above is totally broken and
> just fundamnetally wouldn't work, and breaks all existing setups, but
> maybe it's worth at least discussing as an option?

Hell knows...  That's certainly what I would have prefered, but I wonder
about existing practices along the lines of "mount it in chroot jail
from inside that jail" (as opposed to mount --bind /dev/pts /jail/dev/pts
while preparing it).

Posted patch is too ugly to live and as for the new kind of namespace...
yuck.  We already have far too many :-/