A script for installing ES on SemaphoreCI

es-semaphore.sh

#! /usr/bin/env bash

## Usage:
## wget https://gist.githubusercontent.com/jtadeulopes/ae1f1ffe53000012b27b1112aecaa4b7/raw/45f792729d8b26e42f07028d0693e4de51024383/es-semaphore.sh && bash es-semaphore.sh <es-version>
##

ES_HOST="0.0.0.0"
ES_PORT="9200"
ES_VERSION=${1:-'5.0.0'}
DEB='elasticsearch-'"$ES_VERSION"'.deb'
# URL="https://artifacts.elastic.co/downloads/elasticsearch/$DEB"
URL="https://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/tar/elasticsearch/${ES_VERSION}/elasticsearch-${ES_VERSION}.tar.gz"

function stall_for_elasticsearch() {
  echo ">> Waiting for ElasticSearch to become available"

  while true; do
    printf "."

    nc -4 -w 5 $ES_HOST $ES_PORT 2>/dev/null && break
    sleep 1
  done
  
  printf "\n"
}

function setup_java() {
  source /opt/change-java-version.sh
  change-java-version 8
}

function remove_installed_version() {
  sudo service elasticsearch stop
  sudo apt-get purge -y elasticsearch
  sudo rm -rf /var/lib/elasticsearch
}

function install_new_version() {
  if ! [ -e $SEMAPHORE_CACHE_DIR/$DEB ]; then (cd $SEMAPHORE_CACHE_DIR; wget $URL); fi

  echo ">> Installing ElasticSearch $ES_VERSION"
  echo 'Y' | sudo dpkg -i $SEMAPHORE_CACHE_DIR/$DEB

  sudo service elasticsearch start

  echo ">> Installation completed"
}

function run_health_check() {
  echo ">> Running health check..."
  curl http://"$ES_HOST":"$ES_PORT"/_cluster/health?pretty=true
}

setup_java

remove_installed_version

install_new_version

stall_for_elasticsearch

run_health_check