#!/bin/sh

overlay_enabled() {
	return 0
}

overlay_run() {
	info "Mounting slot..."
	mkdir /slot
	if [ -z "$bootparam_root" ]; then
		fatal "ERROR: No root device was provided."
	fi
	mount -o ro $bootparam_root /slot || fatal "Failed!"
	info "Mounting squashfs..."
	mkdir /ro-root
	mount -t squashfs -o loop=/dev/loop0,ro /slot/rootfs.squashfs /ro-root || fatal "Failed!"
	info "Mounting tmpfs..."
	mkdir /rw-root
	mount -t tmpfs -o size=25%,mode=1777,uid=0,gid=0,rw tmpfs /rw-root || fatal "Failed!"
	if grep -q aufs /proc/filesystems; then
		info "Mounting aufs..."
		mount -t aufs -o br=/rw-root:/ro-root aufs /rootfs || fatal "Failed!"
	else
		info "Mounting overlayfs..."
		mkdir /rw-root/root
		mkdir /rw-root/work
		mount -t overlayfs -o lowerdir=/ro-root,upperdir=/rw-root/root,workdir=/rw-root/work overlayfs /rootfs || fatal "Failed!"
	fi
	if [ -e /slot/overlay.tar.bz2 ]; then
		info "Extracting overlay..."
		tar xf /slot/overlay.tar.bz2 -C /rootfs || fatal "Failed!"
	fi
	info "Moving overlay components..."
	mkdir /rootfs/slot
	mkdir /rootfs/ro-root
	mkdir /rootfs/rw-root
	mount --move /slot /rootfs/slot
	mount --move /ro-root /rootfs/ro-root
	mount --move /rw-root /rootfs/rw-root
	# rootfs is already handled
	bootparam_root=
}