#!/bin/sh

DAEMON="sntp"
# sntp uses all the IPs resolved for the hostname (i.e. pool.ntp.org has 4).
# It will try each until they either all timeout or time has been set. Thus
# default to only providing one NTP pool host.
SNTP_SERVERS="pool.ntp.org"
# Step if time delta is greater then 128ms, otherwise slew
SNTP_ARGS="-Ss -M 128"
SNTP_KEY_CACHE="/tmp/kod"

# shellcheck source=/dev/null
[ -r "/etc/default/$DAEMON" ] && . "/etc/default/$DAEMON"

start() {
	printf 'Starting %s: ' "$DAEMON"
	# Create key cache file to prevents warning that file is missing
	touch $SNTP_KEY_CACHE
	# shellcheck disable=SC2086 # we need the word splitting
	/usr/bin/$DAEMON $SNTP_ARGS -K $SNTP_KEY_CACHE $SNTP_SERVERS
	# sntp behavior
	# - Does not background
	# - Does not infinitely block
	# - Time-out w/o network = ~2 sec
	# - Time-out w/ network = ~5sec * # of servers
	status=$?
	if [ "$status" -eq 0 ]; then
		echo "OK"
	else
		echo "FAIL"
	fi
	return "$status"
}

stop() {
	echo "Nothing to do, $DAEMON is not a daemon."
}

restart() {
	stop
	sleep 1
	start
}

reload() {
	echo "Nothing to do, $DAEMON does not support reload."
}

case "$1" in
	start|stop|restart|reload)
		"$1";;
	*)
		echo "Usage: $0 {start|stop|restart|reload}"
		exit 1
esac