#!/bin/bash
set -eu
set -o pipefail

# NTP server to sync with.
NTP_SERVER="$(os-apply-config --key 'ntp.servers.0.server' --type raw --key-default '')"
SERVICE_NAME="$(svc-map ntpd)"

if [ -n "${NTP_SERVER}" ]; then
    ntpdate -q "${NTP_SERVER}" ||
        { echo "ERROR: ntpdate cannot connect to: ${NTP_SERVER}"; exit 1; }

    # Check ntpd is running, if it is stop the service.
    service "${SERVICE_NAME}" status && service "${SERVICE_NAME}" stop

    # Set the system clock to the value of the NTP clock.
    # Note: This will not sanity check the ntp server like ntpd.
    ntpdate -b "${NTP_SERVER}"
    hwclock --systohc # Re-align the H/W clock. (incase of power loss)

    service "${SERVICE_NAME}" start
fi