#!/bin/sh -e

version="$1"

if [ -f /boot/uEnv.txt ] ; then

	# passing the kernel version is required
	if [ -z "${version}" ]; then
		echo >&2 "W: zz-uenv_txt: ${DPKG_MAINTSCRIPT_PACKAGE:-kernel package} did not pass a version number"
		exit 2
	fi

	unset older_kernel
	older_kernel=$(grep uname_r /boot/uEnv.txt | grep -v '#' | awk -F"=" '{print $2}' || true)

	if [ ! "x${older_kernel}" = "x" ] ; then
		if [ ! "x${older_kernel}" = "x${version}" ] ; then
			echo "zz-uenv_txt: Updating /boot/uEnv.txt [uname_r=${version}]"
			sed -i -e 's:uname_r='${older_kernel}':uname_r='${version}':g' /boot/uEnv.txt
		fi
	else
		echo "uname_r=${version}" >> /boot/uEnv.txt
	fi
fi