#!/bin/bash
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# Starts a Drillbit
#
# chkconfig: 345 85 15
# description: Drillbit
#
### BEGIN INIT INFO
# Provides:          drillbit
# Short-Description: Drillbit
# Default-Start:     3 4 5
# Default-Stop:      0 1 2 6
# Required-Start:    $syslog $remote_fs
# Required-Stop:     $syslog $remote_fs
# Should-Start:
# Should-Stop:
### END INIT INFO

. /lib/lsb/init-functions
RETVAL_SUCCESS=0

STATUS_RUNNING=0
STATUS_DEAD=1
STATUS_DEAD_AND_LOCK=2
STATUS_NOT_RUNNING=3
STATUS_OTHER_ERROR=102


ERROR_PROGRAM_NOT_INSTALLED=5
ERROR_PROGRAM_NOT_CONFIGURED=6


RETVAL=0
SLEEP_TIME=5
PROC_NAME="java"

DAEMON="drillbit"
DESC="Drillbit"
EXEC_PATH="/opt/drill/bin/drillbit.sh"
SVC_USER=""
DAEMON_FLAGS=""
CONF_DIR="/etc/drill/conf"
PIDFILE="/opt/drill/drillbit.pid"
LOCKDIR="/var/lock/subsys"
LOCKFILE="$LOCKDIR/drillbit"
WORKING_DIR="~/"

install -d -m 0755 -o  -g  /var/run/drillbit 1>/dev/null 2>&1 || :
[ -d "$LOCKDIR" ] || install -d -m 0755 $LOCKDIR 1>/dev/null 2>&1 || :

start() {
  [ -x $EXEC_PATH ] || exit $ERROR_PROGRAM_NOT_INSTALLED
  [ -d $CONF_DIR ] || exit $ERROR_PROGRAM_NOT_CONFIGURED
  log_success_msg "Starting ${DESC}: "

  su -s /bin/bash $SVC_USER -c "cd $WORKING_DIR && $EXEC_PATH --config '$CONF_DIR' start $DAEMON_FLAGS"

  # Some processes are slow to start
  sleep $SLEEP_TIME
  checkstatusofproc
  RETVAL=$?

  [ $RETVAL -eq $RETVAL_SUCCESS ] && touch $LOCKFILE
  return $RETVAL
}


stop() {
  log_success_msg "Stopping ${DESC}: "
  start_daemon $EXEC_PATH --config "$CONF_DIR" stop $DAEMON_FLAGS
  RETVAL=$?

  [ $RETVAL -eq $RETVAL_SUCCESS ] && rm -f $LOCKFILE $PIDFILE
}

restart() {
  stop
  start
}

checkstatusofproc(){
  pidofproc -p $PIDFILE $PROC_NAME > /dev/null
}

checkstatus(){
  checkstatusofproc
  status=$?

  case "$status" in
    $STATUS_RUNNING)
      log_success_msg "${DESC} is running"
      ;;
    $STATUS_DEAD)
      log_failure_msg "${DESC} is dead and pid file exists"
      ;;
    $STATUS_DEAD_AND_LOCK)
      log_failure_msg "${DESC} is dead and lock file exists"
      ;;
    $STATUS_NOT_RUNNING)
      log_failure_msg "${DESC} is not running"
      ;;
    *)
      log_failure_msg "${DESC} status is unknown"
      ;;
  esac
  return $status
}

condrestart(){
  [ -e $LOCKFILE ] && restart || :
}

check_for_root() {
  if [ $(id -ur) -ne 0 ]; then
    echo 'Error: root user required'
    echo
    exit 1
  fi
}

service() {
  case "$1" in
    start)
      check_for_root
      start
      ;;
    stop)
      check_for_root
      stop
      ;;
    status)
      checkstatus
      RETVAL=$?
      ;;
    restart)
      check_for_root
      restart
      ;;
    condrestart|try-restart)
      check_for_root
      condrestart
      ;;
    *)
      echo $"Usage: $0 {start|stop|status|restart|try-restart|condrestart}"
      exit 1
  esac
}

service "$1"

exit $RETVAL