#!/usr/bin/env bash
#
# Initial script for Live operating system
# This script are launching before starting init from linux-live script.
# Current dir allways must be set to root (/)
# All system path must be relative, except initrd dirs

ENABLED=yes
[[ ${ENABLED} == "yes" ]] || exit 0
DEBUGMODE=no

PATH=.:/:/usr/bin:/usr/local/bin:/usr/local/sbin

[[ -d /usr/lib/ublinux ]] && { unset ROOTFS; unset CMD_CHROOT; } || { ROOTFS='.'; CMD_CHROOT='chroot . '; }
SOURCE=${ROOTFS}/usr/lib/ublinux/functions; [[ -f ${SOURCE} ]] && . ${SOURCE} 2>/dev/null || exit 0
SOURCE=${ROOTFS}/usr/lib/ublinux/os-config; [[ -f ${SOURCE} ]] && . ${SOURCE} 2>/dev/null || exit 0
debug_mode "$0" "$@"

SYSCONF="${ROOTFS}/${SYSCONF}"
SOURCE=${SYSCONF}/config; [[ -f ${SOURCE} ]] && . ${SOURCE} 2>/dev/null
SOURCE=${SYSCONF}/network; [[ -f ${SOURCE} ]] && . ${SOURCE} 2>/dev/null

    # List NTP servers: PART_SYSTEMDPATH/Service_Name Process_Name
    NTP_SERVICES_PROCESS="
        sysinit.target.wants/systemd-timesyncd.service systemd-timesyncd
        multi-user.target.wants/ntpd.service ntpd
        multi-user.target.wants/ntpdate.service ntpdate
        multi-user.target.wants/chronyd.service chronyd
        multi-user.target.wants/openntpd.service ntpd
        multi-user.target.wants/ptp4l.service ptp4l
        multi-user.target.wants/phc2sys.service phc2sys"

exec_ntp_servers_set(){
    restart_systemd_ntp(){
        if [[ -n ${ROOTFS} ]]; then
            ${CMD_CHROOT} /usr/bin/systemctl --quiet enable ${NTP_SYSTEMSERVICE} &>/dev/null 
        else
	    /usr/bin/systemctl daemon-reload
            /usr/bin/systemctl --quiet enable ${NTP_SYSTEMSERVICE} &>/dev/null
            /usr/bin/systemctl --quiet restart ${NTP_SYSTEMSERVICE} &>/dev/null
        fi
    }
    ISSYSTEMD=$(readlink -fq ${ROOTFS}/usr/bin/init | grep "lib/systemd/systemd$")
    if [[ ${NTPSERVERS,,} == "dhcp" ]]; then
	# Вызывая из NetworkManager скрипта, переменна ${NTPSERVERS} перезаписана на сервера NTP из DHCP
	[[ -n $1 ]] && local NTPSERVERS="$1"
    fi
    if [[ ${NTPSERVERS,,} == @(stop|no|disable) ]]; then
	exec_ntp_servers_stop
    elif [[ ${NTPSERVERS,,} == "dhcp" ]]; then
	# Активная systemd и выбран сервис NTP_SYSTEMSERVICE=systemd-timesyncd.service
	if [[ -n ${ISSYSTEMD} && ${NTP_SYSTEMSERVICE} == "systemd-timesyncd.service" && -f ${ROOTFS}/usr/lib/systemd/system/systemd-timesyncd.service ]]; then
	    restart_systemd_ntp
	fi
    elif [[ -n ${NTPSERVERS} ]]; then
	[[ ${NTPSERVERS,,} == "default" ]] && NTPSERVERS=${NTPSERVERS_DEFAULT}
	[[ ${NTPSERVERS,,} == "ntp-ru" ]] && NTPSERVERS=${NTPSERVERS_RU}
	# Активная systemd и выбран сервис NTP_SYSTEMSERVICE=systemd-timesyncd.service
	if [[ -n ${ISSYSTEMD} && ${NTP_SYSTEMSERVICE} == "systemd-timesyncd.service" && -f ${ROOTFS}/usr/lib/systemd/system/systemd-timesyncd.service ]]; then
	    NTPSERVERS=$(tr ',;' ' ' <<< ${NTPSERVERS})
#	    CONFIG_TIMESYNCD="${ROOTFS}/etc/systemd/timesyncd.conf.d/ublinux${ETH_INTERFACE}.conf"
	    CONFIG_TIMESYNCD="${ROOTFS}/etc/systemd/timesyncd.conf.d/ubconfig.conf"
	    [[ -d ${CONFIG_TIMESYNCD%/*} ]] || mkdir -p ${CONFIG_TIMESYNCD%/*}
	    rm -f ${CONFIG_TIMESYNCD%/*}/ubconfig*.conf
	    cat <<-EOF > "${CONFIG_TIMESYNCD}"
[Time]
NTP=${NTPSERVERS}
FallbackNTP=${NTPSERVERS_FALLBACK}
EOF
	    restart_systemd_ntp
	fi
    fi
}
exec_ntp_servers_stop(){
    # Определяем активную systemd
    ISSYSTEMD=$(readlink -fq ${ROOTFS}/usr/bin/init | grep "lib/systemd/systemd$")
    while IFS=' ' read ITEM_NTP_SERVICE ITEM_NTP_PROCESS; do
        [[ -z ${ITEM_NTP_SERVICE} || -z ${ITEM_NTP_PROCESS} ]] && continue
	if [[ -n ${ISSYSTEMD} && -n ${ROOTFS} ]]; then
	        ${CMD_CHROOT} /usr/bin/systemctl --quiet disable ${ITEM_NTP_SERVICE##*/} &>/dev/null 
	elif [[ -n ${ISSYSTEMD} ]]; then
	        /usr/bin/systemctl --quiet disable --now ${ITEM_NTP_SERVICE##*/} &>/dev/null || pkill -f ${ITEM_NTP_PROCESS}
	fi
    done < <(tr -d '\t' <<< ${NTP_SERVICES_PROCESS})
}

################
##### MAIN #####
################

    if [[ -z $@ || $1 == set ]]; then
	shift
	exec_ntp_servers_set $@
    elif [[ $1 == remove ]]; then
	shift
	exec_ntp_servers_stop $@
    fi