#!/bin/sh

on_exit()
{
  mountpoint -q /proc && umount /proc
  exec /sbin/init $*
}
trap on_exit 0


mount -t proc proc /proc || exit
grep -q overlay /proc/filesystems || exit

mount -t jffs2 /dev/$(awk -F ':' '/rootfs_data/ {print $1}' /proc/mtd | sed 's/mtd/mtdblock/') /overlay || \
  mount -t tmpfs tmpfs /overlay || exit

if grep -q overlayfs /proc/filesystems; then
  mount -t overlayfs overlayfs -o lowerdir=/,upperdir=/overlay,ro /mnt \
    || { umount /overlay; exit; }
else
  overlay_rootdir=/overlay/root
  overlay_workdir=/overlay/work
  mkdir -p ${overlay_rootdir} ${overlay_workdir}
  mount -t overlay overlay \
        -o lowerdir=/,upperdir=${overlay_rootdir},workdir=${overlay_workdir} /mnt \
    || { umount /overlay; exit; }
fi

pivot_root /mnt /mnt/rom
mount -o noatime,move /rom/proc /proc
mount -o noatime,move /rom/dev /dev
mount -o noatime,move /rom/overlay /overlay