#!/bin/bash

##################################################
# Mount dir                                      #
# - /opt/tomcat/webapps                          #
# - /opt/tomcat/logs                             #
# ENV                                            #
# - JAVA_OPTS                                    #
# - CATALINA_OUT                                 #
##################################################

set -euo pipefail
export LANG=en_US.UTF-8
trap Quit EXIT

PIDS=
GOT_SIGTERM=
CATALINA_OUT=${CATALINA_OUT:-/dev/null}
export JAVA_OPTS="-server -Djava.security.egd=file:/dev/./urandom -Duser.timezone=GMT+08 ${JAVA_OPTS:-}"

function Print {
    local file=/dev/null
    [ '-f' = "$1" ] && file=$2 && shift && shift
    date +"[%F %T] $*" | tee -a $file
}

function Quit {
    Print killing java ...
    while :; do
        pkill -f java && Print killing java ... || break
        sleep 1
    done
    Print Container stopped.
    test -n "$GOT_SIGTERM"
}

function RestoreConf {
    if [ -z "$(ls conf/)" ]; then
        Print Restoring default config files and quit ...
        tar zxf conf.tgz
        exit
    fi
}

function StartProc {
    Print Starting tomcat ...
    ./bin/catalina.sh run &>> $CATALINA_OUT &
    PIDS="$PIDS $!"
    Print Tomcat started.
}

function Main {
    local pid=
    cd /opt/tomcat
    RestoreConf
    StartProc
    trap "GOT_SIGTERM=1; Print Got SIGTERM ..." SIGTERM
    while [ -z "$GOT_SIGTERM" ] && sleep 2; do
        for pid in $PIDS; do
            [ ! -e /proc/$pid ] && Print Unexpected error! && exit
        done
    done
}

# Start here
Main