Re: [RCF] [PATCH] unprivileged mount/umount

[Jamie Lokier <jamie@shareable.org>]

Miklos Szeredi wrote:
> >      # Make a named namespace.
> >      NSNAME='fred'
> >      mkdir /var/namespaces/$NSNAME
> >      run_in_new_namespace mount -t bind / /var/namespaces/$NSNAME
> 
> That's not going to work, since the mount will only affect the new
> namespace.

Ah, good point.  I'm still thinking in terms of shared subtrees, where
it might work.

> You'd need clone(), and then in the original namespace
> 
>    mount --bind /proc/CHILDPID/root /var/namespace/$NSNAME
> 
> and then child process can safely exit.

Or pass the file descriptor over a unix domain socket, so that it
doesn't need /proc.

-- Jamie