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Re: chroot in /usr and initrd booting



On Fri, Jun 07, 2002 at 04:13:11AM +0200, Andreas Bombe wrote:
> On Thu, Jun 06, 2002 at 08:45:13PM -0500, Steve Langasek wrote:
> > On Fri, Jun 07, 2002 at 03:32:57AM +0200, Andreas Bombe wrote:
> > > In short, when booting an initrd, after the pivot_root a chroot has to
> > > be done into the new root.  If /usr is on a separate partition, chroot
> > > isn't available, boot fails.
> > 
> > With what kernels must you do a chroot after pivot_root?  On systems
> > where I'm using pivot_root + Linux 2.4.18, I only have to do 'cd /'.

> I'm just going by the Documentation/initrd.txt in the Linux sources
> (I looked in 2.4.18 here).  pivot_root(1) also recommends a chroot.

> In any case much is implementation defined (like whether the shell's
> root is implicitly changed), so it's better to stick to the protocol.
> It might change, and a simple cd might not be sufficient anymore.

> Anyway, can you umount the initrd if you only did a 'cd /'?

Well, no, because the script itself, if still running, has files open on
that device: the executable and all the libraries it loads.  You have to
exec a different program/script on your main root in order to free up
the mount point, IIRC.

Steve Langasek
postmodern programmer

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