#!/bin/sh
### BEGIN INIT INFO
# Provides:          apache2
# Required-Start:    $local_fs $remote_fs $network $syslog $named
# Required-Stop:     $local_fs $remote_fs $network $syslog $named
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# X-Interactive:     true
# Short-Description: Start/stop apache2 web server
### END INIT INFO

set -e

SCRIPTNAME="${0##*/}"
SCRIPTNAME="${SCRIPTNAME##[KS][0-9][0-9]}"
if [ -n "$APACHE_CONFDIR" ] ; then
    if [ "${APACHE_CONFDIR##/etc/apache2-}" != "${APACHE_CONFDIR}" ] ; then
        DIR_SUFFIX="${APACHE_CONFDIR##/etc/apache2-}"
    else
        DIR_SUFFIX=
    fi
elif [ "${SCRIPTNAME##apache2-}" != "$SCRIPTNAME" ] ; then
    DIR_SUFFIX="-${SCRIPTNAME##apache2-}"
    APACHE_CONFDIR=/etc/apache2$DIR_SUFFIX
else
    DIR_SUFFIX=
    APACHE_CONFDIR=/etc/apache2
fi
if [ -z "$APACHE_ENVVARS" ] ; then
    APACHE_ENVVARS=$APACHE_CONFDIR/envvars
fi
export APACHE_CONFDIR APACHE_ENVVARS

ENV="env -i LANG=C PATH=/usr/local/bin:/usr/bin:/bin"
if [ "$APACHE_CONFDIR" != /etc/apache2 ] ; then
    ENV="$ENV APACHE_CONFDIR=$APACHE_CONFDIR"
fi
if [ "$APACHE_ENVVARS" != "$APACHE_CONFDIR/envvars" ] ; then
    ENV="$ENV APACHE_ENVVARS=$APACHE_ENVVARS"
fi


#edit /etc/default/apache2 to change this.
HTCACHECLEAN_RUN=auto
HTCACHECLEAN_MODE=daemon
HTCACHECLEAN_SIZE=300M
HTCACHECLEAN_DAEMON_INTERVAL=120
HTCACHECLEAN_PATH=/var/cache/apache2$DIR_SUFFIX/mod_disk_cache
HTCACHECLEAN_OPTIONS=""

APACHE_HTTPD=$(. $APACHE_ENVVARS && echo $APACHE_HTTPD)
if [ -z "$APACHE_HTTPD" ] ; then
    APACHE_HTTPD=/usr/sbin/apache2
fi
if [ ! -x $APACHE_HTTPD ] ; then
    echo "No apache MPM package installed"
    exit 0
fi

. /lib/lsb/init-functions

test -f /etc/default/rcS && . /etc/default/rcS

if [ -f /etc/default/apache2$DIR_SUFFIX ] ; then
    . /etc/default/apache2$DIR_SUFFIX
elif [ -f /etc/default/apache2 ] ; then
    . /etc/default/apache2
fi

APACHE2CTL="$ENV /usr/sbin/apache2ctl"
HTCACHECLEAN="$ENV /usr/sbin/htcacheclean"

PIDFILE=$(. $APACHE_ENVVARS && echo $APACHE_PID_FILE)
if [ -z "$PIDFILE" ] ; then
    echo ERROR: APACHE_PID_FILE needs to be defined in $APACHE_ENVVARS >&2
    exit 2
fi


check_htcacheclean() {
    [ "$HTCACHECLEAN_MODE" = "daemon" ] || return 1

    [ "$HTCACHECLEAN_RUN"  = "yes"    ] && return 0

    MODSDIR=$(. $APACHE_ENVVARS && echo $APACHE_MODS_ENABLED)
    [ "$HTCACHECLEAN_RUN"  = "auto" \
      -a -e ${MODSDIR:-$APACHE_CONFDIR/mods-enabled}/disk_cache.load ] && \
        return 0

    return 1
}

start_htcacheclean() {
    if [ ! -d "$HTCACHECLEAN_PATH" ] ; then
        echo "... directory $HTCACHECLEAN_PATH does not exist!" >&2
        return 1
    fi
    $HTCACHECLEAN $HTCACHECLEAN_OPTIONS -d$HTCACHECLEAN_DAEMON_INTERVAL \
            -i -p$HTCACHECLEAN_PATH -l$HTCACHECLEAN_SIZE
}

stop_htcacheclean() {
    pkill -P 1 -f "htcacheclean.* -p$HTCACHECLEAN_PATH " 2> /dev/null || echo ...not running
}

pidof_apache() {
    # if there is actually an apache2 process whose pid is in PIDFILE,
    # print it and return 0.
    if [ -e "$PIDFILE" ]; then
        if pidof apache2 | tr ' ' '\n' | grep -w $(cat $PIDFILE); then
            return 0
        fi
    fi
    return 1
}

apache_stop() {
    if $APACHE2CTL configtest > /dev/null 2>&1; then
        # if the config is ok than we just stop normaly
                $APACHE2CTL stop 2>&1 | grep -v 'not running' >&2 || true
    else
        # if we are here something is broken and we need to try
        # to exit as nice and clean as possible
        PID=$(pidof_apache) || true

        if [ "${PID}" ]; then
            # in this case it is everything nice and dandy and we kill apache2
            echo
            log_warning_msg "The apache2$DIR_SUFFIX configtest failed, so we are trying to kill it manually. This is almost certainly suboptimal, so please make sure your system is working as you'd expect now!"
                        kill $PID
        elif [ "$(pidof apache2)" ]; then
            if [ "$VERBOSE" != no ]; then
                                echo " ... failed!"
                    echo "You may still have some apache2 processes running.  There are"
                    echo "processes named 'apache2' which do not match your pid file,"
                    echo "and in the name of safety, we've left them alone.  Please review"
                    echo "the situation by hand."
                        fi
                        return 1
        fi
    fi
}

apache_wait_stop() {
    # running ?
    PIDTMP=$(pidof_apache) || true
    if kill -0 "${PIDTMP:-}" 2> /dev/null; then
        PID=$PIDTMP
    fi

    apache_stop

    # wait until really stopped
    if [ -n "${PID:-}" ]; then
        i=0
        while kill -0 "${PID:-}" 2> /dev/null;  do
                if [ $i = '60' ]; then
                    break;
                else
                    if [ $i = '0' ]; then
                            echo -n " ... waiting "
                    else
                                echo -n "."
                    fi
                    i=$(($i+1))
                    sleep 1
                  fi
         done
    fi
}

case $1 in
    start)
        log_daemon_msg "Starting web server" "apache2"
        if $APACHE2CTL start; then
            if check_htcacheclean ; then
                log_progress_msg htcacheclean
                start_htcacheclean || log_end_msg 1
            fi
                        log_end_msg 0
                else
                        log_end_msg 1
                fi
    ;;
    stop)
        if check_htcacheclean ; then
            log_daemon_msg "Stopping web server" "htcacheclean"
            stop_htcacheclean
            log_progress_msg "apache2"
        else
            log_daemon_msg "Stopping web server" "apache2"
        fi
        if apache_wait_stop; then
                        log_end_msg 0
                else
                        log_end_msg 1
                fi
    ;;
    graceful-stop)
        if check_htcacheclean ; then
            log_daemon_msg "Stopping web server" "htcacheclean"
            stop_htcacheclean
            log_progress_msg "apache2"
        else
            log_daemon_msg "Stopping web server" "apache2"
        fi
        if $APACHE2CTL graceful-stop; then
                        log_end_msg 0
                else
                        log_end_msg 1
                fi
    ;;
    reload | force-reload | graceful)
                log_daemon_msg "Reloading web server config"
                if pidof_apache > /dev/null ; then
                    log_progress_msg "apache2"
                    if ! $APACHE2CTL configtest > /dev/null 2>&1; then
                        log_end_msg 1
                        $APACHE2CTL configtest || true
                        exit 1
                    fi
                    if $APACHE2CTL graceful $2 ; then
                        log_end_msg 0
                    else
                        log_end_msg 1
                    fi
                else
                    log_progress_msg "apache2 not running"
                    log_end_msg 0
                fi
    ;;
    restart)
        if ! $APACHE2CTL configtest > /dev/null 2>&1; then
            $APACHE2CTL configtest || true
            log_end_msg 1
            exit 1
        fi
        if check_htcacheclean ; then
            log_daemon_msg "Restarting web server" "htcacheclean"
            stop_htcacheclean
            log_progress_msg apache2
        else
            log_daemon_msg "Restarting web server" "apache2"
        fi
        PID=$(pidof_apache) || true
        if ! apache_wait_stop; then
                        log_end_msg 1 || true
                fi
        if $APACHE2CTL start; then
            if check_htcacheclean ; then
                start_htcacheclean || log_end_msg 1
            fi
                        log_end_msg 0
                else
                        log_end_msg 1
                fi
    ;;
    start-htcacheclean)
        log_daemon_msg "Starting htcacheclean"
        start_htcacheclean || log_end_msg 1
        log_end_msg 0
    ;;
    stop-htcacheclean)
        log_daemon_msg "Stopping htcacheclean"
            stop_htcacheclean
            log_end_msg 0
    ;;
    status)
        PID=$(pidof_apache) || true
        if [ -n "$PID" ]; then
            echo "Apache2$DIR_SUFFIX is running (pid $PID)."
            exit 0
        else
            echo "Apache2$DIR_SUFFIX is NOT running."
            if [ -e "$PIDFILE" ]; then
                exit 1
            else
                exit 3
            fi
        fi
    ;;
    *)
        log_success_msg "Usage: /etc/init.d/apache2$DIR_SUFFIX {start|stop|graceful-stop|restart|reload|force-reload|start-htcacheclean|stop-htcacheclean|status}"
        exit 1
    ;;
esac