#!/usr/bin/sh
#----------------------------------------------------------------------------
# /var/install/bin/ntp-update-leap-file - download and update leap second file
#
# Copyright (c) 2015-2024  The Eisfair Team, team(at)eisfair(dot)org
#
# Creation:     jed
# Last Update:  $Id$
#
# Usage:        ntp-update-leap-file [--quiet][--file filename]
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#----------------------------------------------------------------------------

# read eislib
if [ -f /var/install/include/eislib ]
then
    . /var/install/include/eislib
fi

# activate debug output
#debug_ntp=true
if ${debug_ntp:-false}
then
    exec 2> /tmp/$(basename ${0})-trace$$.log
    set -x
    ask_debug=true
    export ask_debug
fi

#----------------------------------------------------------------------------
# my own echo
#----------------------------------------------------------------------------
myecho ()
{
    if [ "${quiet}" != '--quiet' ]
    then
        # be verbose
        _me_exit=0
        _me_switch=''
        _me_outstr=''
        while [ ${_me_exit} -eq 0 ]
        do
            case $1 in
                -n|-*std|*stdbr|-*info|-*warn|-*error|-*link|-*ok|-*fail|-*tty|-*html|-*file )
                    _me_switch="${_me_switch}$1 "
                    shift
                    ;;
                * )
                    _me_outstr="$*"
                    _me_exit=1
                    ;;
            esac
        done

        if [ "${_EISLIB}" = 'true' ]
        then
            mecho ${_me_switch} "${_me_outstr}"
        else
            if [ -n "${_me_switch}" ]
            then
                # --info "TEXT" -> "INFO:Text"
                echo "`echo "${_me_switch}" | tr '[:lower:]' '[:upper:]' | sed 's/\-//g'`:${_me_outstr}"
            else
                echo "${_me_outstr}"
            fi
        fi
    fi
}

#============================================================================
# main
#============================================================================

ntp_conffile=/etc/ntp.conf
ntp_leapfile=`grep "^leapfile" ${ntp_conffile} | sed 's/^[^ ]* *//'`
ntp_tmpfile=/tmp/ntp-leap.$$

download_url='https://data.iana.org/time-zones/data/leap-seconds.list'

quiet=''
download_only=0
if [ $# -gt 0 ]
then
    # read parameter(s)
    while [ $# -gt 0 ]
    do
        case $1 in
            -*file )
                # overwrite destination file
                if [ -n "$2" ]
                then
                    download_only=1
                    ntp_leapfile="$2"
                    shift
                fi
                shift
                ;;
            -*quiet )
                quiet='--quiet'
                shift
                ;;
            * )
                # skip unknown parameters
                shift
                ;;
        esac
    done
fi

if [ "${quiet}" != '--quiet' -a "${_EISLIB}" = 'true' ]
then
    clrhome
fi

myecho --info "NTP download/update leap-second file"
myecho

myecho "downloading leap-seconds file '${download_url}' ..."
myecho

# set default generic error code
wget_ret=1

# check availability pf wget.sh script
WGETSH=`which wget.sh 2>/dev/null`

if [ $? -eq 0 ]
then
    # download command found
    for NUM in 1 2 3 4 5
    do
        if [ "${quiet}" = '--quiet' ]
        then
            ${WGETSH} -O ${ntp_tmpfile} ${download_url} >/dev/null 2>/dev/null
            wget_ret=$?
        else
            ${WGETSH} -O ${ntp_tmpfile} ${download_url}
            wget_ret=$?
        fi

        if [ ${wget_ret} -eq 0 ]
        then
            break
        else
            if [ ${NUM} -ne 5 ]
            then
                sleep ${NUM}
	    fi
        fi
    done

    if [ ${wget_ret} -eq 0 ]
    then
        # download successful
        if [ -s ${ntp_tmpfile} ]
        then
            # downloaded file not empty
            cmp -s ${ntp_tmpfile} ${ntp_leapfile}

            if [ $? -eq 0 ]
            then
                # files are the same
                myecho "leap-second file '${ntp_leapfile}' is up-to-date."
            else
                # files differ
                myecho "updating file ..."

                if [ ${download_only} -eq 1 ]
                then
                    # copy file to destination directory
                    cp ${ntp_tmpfile} ${ntp_leapfile}
                else
                    if [ -f ${ntp_leapfile} ]
                    then
                        # backup previous file
                        cp ${ntp_leapfile} ${ntp_leapfile}.backup
                    fi

                    # move file to destination directory
                    cp ${ntp_tmpfile} ${ntp_leapfile}

                    /var/install/config.d/ntp.sh --quiet --setrights

                    /etc/init.d/ntp ${quiet} restart
                fi
            fi
        else
            myecho --error "Downloaded leap-seconds file is empty!"
        fi
    else
        myecho --error "Download of the leap-seconds file failed!"
    fi
fi

rm -f ${ntp_tmpfile}

if [ ${download_only} -eq 0 -a "${quiet}" != '--quiet' ]
then
    myecho
    anykey
fi

#============================================================================
# end
#============================================================================
exit ${wget_ret}