event.sh

#!/bin/sh
# Copyright 2010 Lekensteyn
# This script is public domain and comes with NO WARRANTY of any kind
#
# Events handler (handles build queue, attacks, etc)
if test `id -u` -eq 0;then
    sudo -u nobody -- "$0"
    exit
fi
running=true
trap 'running=false' 1 2 3 15
cd "$(dirname "$0")/.."
BASEDIR="`pwd`"
PIDFILE="$BASEDIR/tmp/event.pid"
killed=
# worlds, folder names inside htdocs, e.g. htdocs/welt1/daemons
worlds='welt1 welt2'
# if a pidfile still exist (unclean shutdown), kill that pid and wait
# 2 seconds for it to catch our signal
test -f "$PIDFILE" && kill -15 "`cat "$PIDFILE"`" >/dev/null && killed=1
printf $$ > "$PIDFILE"
test -n "$killed" && sleep 2
cd htdocs/daemons
runWorld() {
    local world="$1"
    # example dir: /opt/twlan/htdocs/welt1/daemons
    cd "$BASEDIR/htdocs/$world/daemons"
    env -i LD_LIBRARY_PATH="$BASEDIR/lib" "$BASEDIR/php/php" event.php &
    pid=$!
    # check if we still should run (if we have not been killed)
    while $running;do
        # is PHP not running anymore? Restart it
        if ! kill -0 $pid 2>/dev/null >/dev/null;then
            runWorld "$world"
            return
        fi
        # and wait a second as we do not have to check realtime
        sleep 1
    done
    # kill PHP instance
    kill -15 $pid 2>/dev/null >/dev/null
}
run(){
    test -f "$PIDFILE" || exit 2
    sleep 1
    if test ! -S "$BASEDIR/tmp/mysql.sock";then
        echo 'MySQL is not running.'
        return
    fi
    # list of pids to kill later
    pids=
    # start PHP, run build queues, attacks, etc for each world
    for world in $worlds; do
        runWorld "$world" &
    done
    # keep this process in foreground while running
    while $running; do
        sleep 1
    done
}
run
detect_pid=`cat "$PIDFILE"`
test "$detect_pid" = $$ && rm -f "$PIDFILE"