#!/usr/bin/env 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.

# Terminate a cluster.

if [ -z $1 ]; then
  echo "Cluster name required!"
  exit -1
fi

CLUSTER=$1

# Import variables
bin=`dirname "$0"`
bin=`cd "$bin"; pwd`
. "$bin"/hadoop-ec2-env.sh

# Finding Hadoop image
HADOOP_INSTANCES=`ec2-describe-instances | awk '"RESERVATION" == $1 && ("'$CLUSTER'" == $4 || "'$CLUSTER_MASTER'" == $4), "RESERVATION" == $1 && ("'$CLUSTER'" != $4 && "'$CLUSTER_MASTER'" != $4)'`
HADOOP_INSTANCES=`echo "$HADOOP_INSTANCES" | grep INSTANCE | grep running`

[ -z "$HADOOP_INSTANCES" ] && echo "No running instances in cluster $CLUSTER." && exit 0

echo "Running Hadoop instances:"
echo "$HADOOP_INSTANCES"
read -p "Terminate all instances? [yes or no]: " answer

if [ "$answer" != "yes" ]; then
  exit 1
fi

ec2-terminate-instances `echo "$HADOOP_INSTANCES" | awk '{print $2}'`