openwrtv3/package/base-files/files/lib/firstboot/50_pivot

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#!/bin/sh
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2010 Vertical Communications
with_fo_pivot() {
# switch back to squashfs (temporarily)
# and park the ramdisk ontop of /tmp/root
pivot /rom /mnt
mount -o move /mnt /tmp/root
# /jffs is the overlay
# /rom is the readonly
fopivot /jffs /rom
}
boot_hook_add switch2jffs with_fo_pivot