Re: [PATCH] switch_root: a better approach to subroots

[Karel Zak <kzak-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On Wed, Nov 18, 2009 at 03:33:12PM +0000, Daniel Drake wrote:
> This reverts commit a692a8745941a192528c5e2a05de97155ba586f9.

 Revered and man page updated. switch_root does not support subroots
 from now.

On Wed, Nov 18, 2009 at 03:13:58PM -0500, Peter Jones wrote:
> On 11/18/2009 01:47 PM, Karel Zak wrote:
> > On Wed, Nov 18, 2009 at 03:33:12PM +0000, Daniel Drake wrote:
> >> +.SH NOTES
> >> +switch_root will fail to function if
> >> +.B newroot
> >> +is not the root of a mount. If you want to switch root into a directory that
> >> +does not meet this requirement then you can first use a bind-mounting trick to
> >> +turn any directory into a mount point:
> >> +.sp
> >> +.nf
> >> +.RS
> >> +mount --bind $DIR $DIR
> > 
> >  Cannot we add this functionality directly to the switch_root command?
> >  I mean call:
> > 
> >     mount --bind /newroot/subroot /newroot/subroot 
> >     mount --move /newroot/subroot /
> > 
> >  Now we have:
> > 
> >     mount --move newroot /
> >     chroot /newroot/subroot
> 
> That certainly seems preferable to reverting the patch, especially if, as

 I agree. People (IMHO OLPC project only) who need subroots can easily
 add "mount --bind" to their initrd. 

    Karel


-- 
 Karel Zak  <kzak-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
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