sonic-buildimage/files/image_config/ntp/ntp-config.sh

#!/bin/bash

ntp_default_file='/etc/default/ntp'
ntp_temp_file='/tmp/ntp.orig'

reboot_type='cold'

function get_database_reboot_type()
{
    SYSTEM_WARM_START=`sonic-db-cli STATE_DB hget "WARM_RESTART_ENABLE_TABLE|system" enable`
    SYSTEM_FAST_START=`sonic-db-cli STATE_DB get "FAST_REBOOT|system"`

    if [[ x"${SYSTEM_WARM_START}" == x"true" ]]; then
        reboot_type='warm'
    elif [[ x"${SYSTEM_FAST_START}" == x"1" ]]; then
        reboot_type='fast'
    fi
}

function modify_ntp_default
{
    cp ${ntp_default_file} ${ntp_temp_file}
    sed -e "$1" ${ntp_temp_file} >${ntp_default_file}
}

sonic-cfggen -d -t /usr/share/sonic/templates/ntp.conf.j2 >/etc/ntp.conf

get_database_reboot_type
if [[ x"${reboot_type}" == x"cold" ]]; then
    echo "Enabling NTP long jump for reboot type ${reboot_type} ..."
    modify_ntp_default "s/NTPD_OPTS='-x'/NTPD_OPTS='-g'/"
else
    echo "Disabling NTP long jump for reboot type ${reboot_type} ..."
    modify_ntp_default "s/NTPD_OPTS='-g'/NTPD_OPTS='-x'/"
fi

systemctl restart ntp