On Wed, 18 Nov 2009, Daniel Drake wrote:
> 1. cd /sysroot
> 2. mount --move . /
> 3. chroot .
> 4. cd /
> 5. chdir /versions/run/1
> 6. chroot .
> 7. cd /
> 8. exec /sbin/init
>
> This works well and the system functions as normal. However, I've
> noticed that during shutdown, the root filesystem is never unmounted
> cleanly.
>
> "mount -o remount,ro /" always fails due to this check in do_remount():
> if (path->dentry != path->mnt->mnt_root) {
> return -EINVAL;
>
> Obviously the dentry for the / path that we are trying to unmount is not
> the actual root of the mount. However the root of the mount is long
> gone, so I'm not sure what we can do. And shutting down cleanly is
> obviously important!
You can easily make a directory a root of a mount with
mount --bind $DIR $DIR
In your example, add this before 5.
Thanks,
Miklos
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