#!/bin/bash

[ "$EUID" -ne 0 ] && echo "Run this as root"

get_largest_cros_blockdev() {
	local largest size dev_name tmp_size remo
	size=0
	for blockdev in /sys/block/*; do
		dev_name="${blockdev##*/}"
		echo -e "$dev_name" | grep -q '^\(loop\|ram\)' && continue
		tmp_size=$(cat "$blockdev"/size)
		remo=$(cat "$blockdev"/removable)
		if [ "$tmp_size" -gt "$size" ] && [ "${remo:-0}" -eq 0 ]; then
			case "$(sfdisk -d "/dev/$dev_name" 2>/dev/null)" in
				*'name="STATE"'*'name="KERN-A"'*'name="ROOT-A"'*)
					largest="/dev/$dev_name"
					size="$tmp_size"
					;;
			esac
		fi
	done
	echo -e "$largest"
}

format_part_number() {
	echo -n "$1"
	echo "$1" | grep -q '[0-9]$' && echo -n p
	echo "$2"
}

mount /dev/disk/by-label/STATE /mnt/stateful_partition/
cros_dev="$(get_largest_cros_blockdev)"
if [ -z "$cros_dev" ]; then
	echo "No CrOS SSD found on device. Failing."
    exit 1
fi
stateful=$(format_part_number "$cros_dev" 1)
mkfs.ext4 -F "$stateful" # This only wipes the stateful partition
mount "$stateful" /tmp
mkdir -p /tmp/unencrypted
cp /mnt/stateful_partition/usr/share/packeddata/. /tmp/unencrypted/ -rvf
chown 1000 /tmp/unencrypted/PKIMetadata -R
rm /tmp/.developer_mode
umount /tmp
crossystem disable_dev_request=1