#!/bin/sh

mkdir /run/overlay

# Set up the overlay filesystem
mount -t tmpfs tmpfs /run/overlay
mkdir -p /run/overlay/upper
mkdir -p /run/overlay/work
mkdir -p /run/overlay/root

mount -t overlay overlay -o lowerdir=/,upperdir=/run/overlay/upper,workdir=/run/overlay/work /run/overlay/root

# Pivot the root filesystem to the overlay filesystem
pivot_root /run/overlay/root /run/overlay/root/mnt

# Move the original mount points to their new locations
for i in dev proc sys run; do
    mount --move /mnt/$i /$i
done

# Clean up and switch to the new init
umount /mnt
exec chroot . /sbin/init <dev/console >dev/console 2>&1