#! /bin/sh
#
# atop init script

### BEGIN INIT INFO
# Provides:          atop
# Required-Start:    $syslog $remote_fs
# Required-Stop:     $syslog $remote_fs
# Should-Start:      $local_fs
# Should-Stop:       $local_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Monitor for system resources and process activity
# Description:       Atop is an ASCII full-screen performance monitor,
#                    similar to the top command, but atop only shows
#                    the active system-resources and processes, and
#                    only shows the deviations since the previous
#                    interval.
### END INIT INFO

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="atop system monitor"
NAME=atop
DAEMON=/usr/bin/atop
WRAPPER=/usr/share/atop/atop.wrapper
INTERVAL=600            # interval 10 minutes
LOGPATH="/var/log/atop"
OUTFILE=$LOGPATH/daily.log
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x $DAEMON ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
. /lib/lsb/init-functions

CURDAY=$(date +%Y%m%d)
DAEMON_ARGS="-a -w $LOGPATH/atop_$CURDAY $INTERVAL"

#
# Function that starts the daemon/service
#
do_start()
{
        # Return
        #   0 if daemon has been started
        #   1 if daemon was already running
        #   2 if daemon could not be started
        start-stop-daemon --start --background --quiet \
        --pidfile $PIDFILE \
        --test --startas $WRAPPER > /dev/null \
                || return 1
        start-stop-daemon --start --background --quiet \
            --pidfile $PIDFILE --make-pidfile \
        --startas $WRAPPER -- $DAEMON $OUTFILE \
                $DAEMON_ARGS \
                || return 2
}

#
# Function that stops the daemon/service
#
do_stop()
{
        # Return
        #   0 if daemon has been stopped
        #   1 if daemon was already stopped
        #   2 if daemon could not be stopped
        #   other if a failure occurred
        start-stop-daemon --stop --quiet --retry=USR2/30/KILL/5 --pidfile $PIDFILE --name $NAME
    RETVAL="$?"
        [ "$RETVAL" = 2 ] && return 2
        rm -f $PIDFILE
        return "$RETVAL"
}

case "$1" in
  start)
    [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC " "$NAME"
    do_start
    case "$?" in
                0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
    esac
  ;;
  stop)
        [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
        do_stop
        case "$?" in
                0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
  status)
       status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
       ;;
  restart|force-reload|_cron)
    [ "$1" = "_cron" ] && VERBOSE="no"
        [ "$VERBOSE" != no ] && log_daemon_msg "Restarting $DESC" "$NAME"
        do_stop
        case "$?" in
          0|1)
                do_start
                case "$?" in
                        0) [ "$VERBOSE" != no ] && log_end_msg 0
               [ "$1" = "_cron" ] && sleep 3 && find $LOGPATH -name 'atop_*' -mtime +28 -exec rm {} \;
                   ;;
                        1) [ "$VERBOSE" != no ] && log_end_msg 1 ;; # Old process is still running
                        *) [ "$VERBOSE" != no ] && log_end_msg 1 ;; # Failed to start
                esac
                ;;
          *)
                # Failed to stop
                [ "$VERBOSE" != no ] && log_end_msg 1
                ;;
        esac
        ;;
  *)
    echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
    exit 1
    ;;
esac

exit 0