Re: Use of directories to hold root?

[Al Viro <viro@ftp.linux.org.uk>]

On Sat, Aug 11, 2007 at 05:55:37PM +0200, Jan Engelhardt wrote:
> 
> On Aug 10 2007 17:08, H. Peter Anvin wrote:
> >Jan Engelhardt wrote:
> >> On Aug 10 2007 17:24, Mark Cannon wrote:
> >>> You pass the kernel the root option to specify the root partition.
> >>> Is there a way to identify a directory in that partition that holds the
> >>> root or something equivalent to this?
> >> 
> >> No, but you can use pivot_root.
> >
> >Or better yet, use an initramfs with MS_MOVE; same as you would with the
> >"normal" use of initramfs.
> 
> mount --move /foo /
> => error

mount("foo", "foo", NULL, MS_BIND, 0);
chdir("foo");
mount(".", "/", NULL, MS_MOVE, 0);
chroot(".");