# Sample dhcpcd hook script for ntp
# Like our resolv.conf hook script, we store a database of ntp.conf files
# and merge into /etc/ntp.conf

# You can set the env var NTP_CONF to another file like this
#   dhcpcd -e NTP_CONF=/usr/pkg/etc/ntpd.conf
# or by adding this to /etc/dhcpcd.enter-hook
#   NTP_CONF=/usr/pkg/etc/ntpd.conf
# to use openntpd from pkgsrc instead of the system provided ntp.

# Detect OpenRC or BSD rc
# Distributions may want to just have their command here instead of this
if type rc-service >/dev/null 2>&1 && rc-service --exists ntpd; then
	ntpd_restart_cmd="rc-service ntpd -- --ifstarted --quiet restart"
elif [ -x /etc/rc.d/ntpd ]; then
	ntpd_restart_cmd="/etc/rc.d/ntpd status && /etc/rc.d/ntpd restart"
elif [ -x /usr/local/etc/rc.d/ntpd ]; then
	ntpd_restart_cmd="/usr/local/etc/rc.d/ntpd status && /usr/local/etc/rc.d/ntpd restart"
fi

ntp_conf_dir="$state_dir/ntp.conf"
ntp_conf=${NTP_CONF:-/etc/ntp.conf}

build_ntp_conf()
{
	local cf="$state_dir/ntp.conf.$interface"
	local interfaces= header= srvs= servers= x=

	# Build a list of interfaces
	interfaces=$(list_interfaces "$ntp_conf_dir")

	if [ -n "$interfaces" ]; then
		# Build the header
		for x in ${interfaces}; do
			header="$header${header:+, }$x"
		done

		# Build a server list
		srvs=$(cd "$ntp_conf_dir";
			key_get_value "server " $interfaces)
		if [ -n "$srvs" ]; then
			for x in $(uniqify $srvs); do
				servers="${servers}server $x\n"
			done
		fi
	fi

	# Merge our config into ntp.conf
	[ -e "$cf" ] && rm -f "$cf"
	remove_markers "$signature_base" "$signature_base_end" \
		"$ntp_conf" > "$cf"
	if [ -n "$servers" ]; then
		echo "$signature_base${header:+ $from }$header" >> "$cf"
		printf "$search$servers" >> "$cf"
		echo "$signature_base_end${header:+ $from }$header" >> "$cf"
	fi

	# If we changed anything, restart ntpd
	if change_file "$ntp_conf" "$cf"; then
		[ -n "$ntpd_restart_cmd" ] && eval $ntpd_restart_cmd
	fi
}

add_ntp_conf()
{
	local cf="$ntp_conf_dir/$interface" x=

	[ -e "$cf" ] && rm "$cf"
	[ -d "$ntp_conf_dir" ] || mkdir -p "$ntp_conf_dir"
	if [ -n "$new_ntp_servers" ]; then
		for x in $new_ntp_servers; do
			echo "server $x" >> "$cf"
		done
	fi
	build_ntp_conf
}

remove_ntp_conf()
{
	if [ -e "$ntp_conf_dir/$interface" ]; then
		rm "$ntp_conf_dir/$interface"
	fi
	build_ntp_conf
}

case "$reason" in
BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT|STATIC) 	add_ntp_conf add;;
PREINIT|EXPIRE|FAIL|IPV4LL|NAK|NOCARRIER|RELEASE|STOP)	remove_ntp_conf del;;
esac