#!/usr/bin/env bash
#
# This script is invoked after the createimg script copied the boot partition
# to the mounted image.
#
# The first argument is the folder of the mounted boot partition.
# The second is the boot partition UUID
# This third is the root partition device name
#

if [ "$#" -ne 3 ]; then
	echo "Usage: $0 mnt boot_uuid root_dev"
	exit 1
fi

set -e

mnt=$1
boot_uuid=$2
root_dev=$3

if [ -e $mnt/cmdline.txt ]; then
	cp ${mnt}cmdline.txt ${mnt}cmdline.tmpl
	if [ "$root_dev" != "" ]; then
	        sed -e "s/\${BOOT_UUID}/$boot_uuid/" -e "s/\${ROOT_DEV}/$(echo $root_dev | sed -e 's/[\/&]/\\&/g')/" ${mnt}cmdline.tmpl > ${mnt}cmdline.txt
	else
	        sed -e "s/\${BOOT_UUID}/$boot_uuid/" -e "s/\${ROOT_DEV}/UUID=$root_uuid/" ${mnt}cmdline.tmpl > ${mnt}cmdline.txt
	fi
	rm -f ${mnt}cmdline.tmpl
fi