#!/bin/sh
. /etc/functions.sh

copy_kernel() {
	local input="$1"
	local output="$2"
	local cmdline="$3"
	size="$(echo -n "$cmdline" | wc -c)"
	dd if="$input" bs=3M count=1 > "$output"
	/sbin/patch-cmdline "$output" "$cmdline"
}

fstype="$(mount | grep ' / ' | awk '$5 != "rootfs" {print $5}')"
case "$fstype" in
	ext2|jffs2) echo "Copying from $fstype to yaffs2";;
	*) echo "Invalid filesystem."; exit 1;;
esac

[ -d /tmp/cf2nand ] && {
	echo "/tmp/cf2nand already exists"
	exit 1
}

mkdir /tmp/cf2nand
mkdir /tmp/cf2nand/rootfs
mount -t "$fstype" /dev/root /tmp/cf2nand/rootfs || {
	echo "Mounting rootfs failed."
	exit 1
}

boot="$(find_mtd_part 'Routerboard NAND boot')"
main="$(find_mtd_part 'rootfs')"
[ -z "$boot" -o -z "$main" ] && {
	echo "Cannot find NAND Flash partitions"
	exit 1
}

echo "Erasing filesystem..."
mtd erase Boot 2>/dev/null >/dev/null
mtd erase Main 2>/dev/null >/dev/null

mkdir /tmp/cf2nand/p1
mkdir /tmp/cf2nand/p2
mount -t yaffs2 "$boot" /tmp/cf2nand/p1
mount -t yaffs2 "$main" /tmp/cf2nand/p2

echo "Copying kernel..."
copy_kernel /dev/cfa1 /tmp/cf2nand/p1/kernel "root=/dev/mtdblock1 rootfstype=yaffs2 init=/etc/preinit " 2>/dev/null >/dev/null
umount /tmp/cf2nand/p1
rmdir /tmp/cf2nand/p1

echo "Copying filesystem..."
( cd /tmp/cf2nand/rootfs; tar c . ) | ( cd /tmp/cf2nand/p2; tar x )
echo "chmod ugo+x /" > /tmp/cf2nand/p2/etc/uci-defaults/set_root_permission
sync
# Use kexec is present
[ -x /usr/bin/kexec ] && {
	kexec -l /tmp/cf2nand/p1/kernel --command-line="$(cat /proc/cmdline) root=/dev/mtdblock1 rootfstype=yaffs2 init=/etc/preinit"
	kexec -e
}
umount /tmp/cf2nand/p2
rmdir /tmp/cf2nand/p2

umount /tmp/cf2nand/rootfs
rmdir /tmp/cf2nand/rootfs
rmdir /tmp/cf2nand

