#!/bin/sh
#
# This is a chrony init.d script which ist called by init(1)
# with [start|stop] as argument. This version does not
# need an additional start-stop daemon.
#
# Last change:  Bjørn Bürger <b.buerger@pengutronix.de>
# Date:		Tue Mar  6 16:00:30 UTC 2007

PATH=/sbin:/bin:/usr/bin:/usr/sbin
BINARY="/usr/sbin/chronyd"
CONFIG="/etc/chrony/chrony.conf"
PREFIX="chrony: "
# This system doesn´t have full rtc ioctl support for
# chrony statistic functions
RTC_IOCTL="incomplete"

# some chronyc commands need prior autentication: extract keys from config
KEY=$(awk '$1 ~ /^commandkey$/ { print $2; exit}' /etc/chrony/chrony.conf)
PASSWORD=`awk '$1 ~ /^'$KEY'$/ {print $2; exit}' /etc/chrony/chrony.keys`

# convenience functions
message(){
	echo "${PREFIX}$*" >&2
}

message_n(){
	echo -n "${PREFIX}$*" >&2
}

bailout(){
	echo "${PREFIX}ERROR   --- $*" >&2
	exit 1
}

usage(){
	echo "Usage: $0 {start|stop|restart|force-reload|online|offline|set-rtc|status|statistics}"
}

killproc() {
	killall $1
}

# main functions
start_proc() {
	message_n "Reading system time from RealTimeClock ..."
	/sbin/hwclock --hctosys || message_n " ### FAILED ### "
	message "DONE"
	message_n "Starting NTP server: chronyd ..."
	[ -e "$CONFIG" ] || bailout "Configfile $CONFIG not found, PANIC!"
	$BINARY -f $CONFIG
	message "DONE"
}

stop_proc() {
	message_n "Stopping NTP server: chronyd ..."
	killproc chronyd
	message "DONE"
	message_n "Writing system time to RealTimeClock ..."
	/sbin/hwclock --systohc || message_n " ### FAILED ### "
	message "DONE"
}

set_online(){
        message_n "Setting NTP server ONLINE ... "
	pidof chronyd > /dev/null || bailout " chronyd is not running "
	/usr/bin/chronyc <<-EOF
	password $PASSWORD
	online
	burst 5/10
	quit
	EOF
	message "DONE"
	exit 0
}

set_offline(){
        message_n "Setting NTP server OFFLINE ... "
	pidof chronyd > /dev/null || bailout " chronyd is not running "
	/usr/bin/chronyc <<-EOF
	password $PASSWORD
	offline
	EOF
	message "DONE"
	exit 0
}

set_rtc(){
	pidof chronyd > /dev/null || bailout " chronyd is not running "
	if [ "$RTC_IOCTL" == "incomplete" ] ; then 
	# We are running on a system with limited rtc support,
	# so we cannot let the ntp client do the job. 
	stop_proc
	sleep 1
	start_proc
	exit 0
	else
	# This requires enhanced rtc support
        message_n "Setting NTP time to RTC ... "
	cat <<-EOF | /usr/bin/chronyc
	password $PASSWORD
	trimrtc
	writertc
	dump
	EOF
	message "DONE"
	exit 0
	fi
}

status(){
	pidof chronyd > /dev/null || bailout " chronyd is not running "
	cat <<-EOF | /usr/bin/chronyc
	password $PASSWORD
	tracking
	sources
	EOF
}

statistics(){
	pidof chronyd > /dev/null || bailout " chronyd is not running "
	cat <<-EOF | /usr/bin/chronyc
	password $PASSWORD
	sourcestats
	EOF
}

case "$1" in
        start)
        	start_proc
		;;
	stop)
		stop_proc
		;;
        restart|force-reload)
                message "Restarting NTP server: chronyd ... "
                stop_proc
		sleep 1
                start_proc
                ;;
        reload)
                message "Reload is not supported"
		exit 1
		;;
	online)
		set_online
		;;
	offline)
		set_offline
		;;
	set-rtc)
		set_rtc
		;;
	status)
		status
		;;
	statistics)
		statistics
		;;
        *)
                usage
		exit 1
                ;;
esac

exit 0