#!/usr/bin/env bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2020, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

if [ -z "${TIMEZONE}" ]; then
    exit 0
fi

if ! timedatectl set-timezone "${TIMEZONE}" 2>/dev/null; then
    _tz_base='/usr/share/zoneinfo/'
    _tz_dest=$(readlink -f "${_tz_base}${TIMEZONE}" 2>/dev/null)

    # if timezone file path is resolvable file and
    # real path is inside the timezone directory
    if [ -n "${_tz_dest}" ] &&
       [ -f "${_tz_dest}" ] &&
       [[ "${_tz_dest}" =~ ^${_tz_base} ]];
    then
        ln -sf "${_tz_dest}" /etc/localtime
    else
        echo "ERROR: Invalid timezone '${TIMEZONE}'" >&2
        exit 1
    fi
fi