cmon

#!/bin/bash
# All files in this package is subject to the GPL v2 license
# More information is in the COPYING file in the top directory of this package.
# Copyright (C) 2011 severalnines.com

# chkconfig: 235 99 20
# description: cmon start/stop script

### BEGIN INIT INFO
# Provides:             cmon
# Required-Start:       $remote_fs $syslog
# Required-Stop:        $remote_fs $syslog
# Default-Start:        2 3 4 5
# Default-Stop:         0 1 6
# Short-Description:    cmon - cluster monitor
### END INIT INFO

SBINDIR=/usr/local/cmon/sbin
RUNNING_DIR=/var/run
PIDFILE=${RUNNING_DIR}/cmon.pid

LOCKFILE=""
if [ -d /var/lock/subsys ]
then
  LOCKFILE=/var/lock/subsys/cmon
else
  LOCKFILE=/var/lock/cmon
fi

OPTIONS="--config-file=/etc/cmon.cnf"
PROGNAME=cmon
STARTCMON="$SBINDIR/$PROGNAME $OPTIONS"

RETVAL=0

pidof_prog() {
  if [ -e "$PIDFILE" ]
  then
    if pidof $PROGNAME | tr ' ' '\n' | grep $(cat $PIDFILE)
    then
      return 0
    fi
  fi
  return 1
}

start() {
  echo -n "Starting $PROGNAME $OPTIONS :"
  PID=`pgrep -f "$STARTCMON"`
  if [ -n "$PID" ]
  then
    printf "$PROGNAME is already running with pid $PID\n"
    return 0
  else
    if [ ! -f $SBINDIR/$PROGNAME ]
    then
      echo -n "$PROGNAME executable not found in $SBINDIR\n"
    fi
    $STARTCMON  > /dev/null 2>&1 &
    echo $! > $PIDFILE              
    touch $LOCKFILE
    sleep 1
    PID=`cat $PIDFILE`
    if [ "$PID" ]
    then
      echo " ok"
      return 0
    else
      echo " failed"
      return 1
    fi
  fi
}

stop() {
  echo -n "Stopping $PROGNAME : "
  PID=`pgrep -f "$STARTCMON"`
  if [ -n "$PID" ]
  then
    kill -15 $PID
    return 0
  else
    `rm -f ${PIDFILE}`
    `rm -f ${LOCKFILE}`
    echo " failed"
    # should really be 1 but chef complains
    return 0
  fi

  i=1
  while [ "`pgrep -f "$STARTCMON"`" ]
  do
    if [ $i -eq 60 ]; then
      echo "giving up after 60 secods"
      return 0
    fi
    i=`expr $i + 1`
    sleep 1
  done
  
  PID=`pgrep -f "$STARTCMON"`
  if [ -n "$PID" ]
  then
    echo " failed"
    # should really be 1 but chef complains
    return 0
  else
    `rm -f ${PIDFILE}`
    `rm -f ${LOCKFILE}`
    echo " ok"
    return 0
  fi
}

case "$1" in
  init|initial)
    initial
    ;;
  start)
    start
    RETVAL=$?
    ;;
  stop)
    stop
    RETVAL=$?
    ;;
  status)
    PID=$(pidof_prog) || true
    if [ -n "$PID" ]
    then
      echo "$PROGNAME is running (pid $PID)."
      RETVAL=0
    else
      echo "$PROGNAME is NOT running."
      RETVAL=1
    fi
    ;;
  condrestart|try-restart) 
    PID=$(pidof_prog) || true
    if [ -n "$PID" ]
    then
      stop         
     start
    fi
    ;;
  restart|reload|force-reload)
    stop
    start
    RETVAL=$?
    ;;
  *)
    echo $"Usage: $0 {start|stop|restart|status}"
    exit 1
esac

exit $RETVAL