setup_easeagent.sh

#! /bin/bash
# This is a script to download easeagent-sm.jar and export JAVA_OPTS for a JVM application.
# Usage:   
#   source /dev/stdin <<< "$(curl -SL https://git.io/vD7Bp)"

JAR='easeagent-sm.jar'
URL="https://github.com/hexdecteam/stagemonitor/releases/download/v0.25.1-easestack/${JAR}"
DIR="${HOME}/.easestack"

function download {  
  mkdir -p $DIR
  curl -Lk $URL -o $DIR/$JAR
  
  result=$?
  
  if [ $result -ne 0 ]; then
    rm -rf $DIR/$JAR
  fi
  
  return $result
}

function check_required_envs {
  echo "checking required environment variables..."
  
  if [ -z $EA_LOG_CONF ]; then
    echo 'Missing $EA_LOG_CONF'
    return 1
  fi

  if [ -z $EA_APP_CONF ]; then
    echo 'Missing $EA_APP_CONF'
    return 1
  fi

  return 0
}

function download_if_absent {
  if [ -f "${DIR}/${JAR}" ]; then
    echo "${DIR}/${JAR} was found."
  else
    echo "Download ${JAR} to ${DIR} ..."
    download    
    return $?
  fi
}

check_required_envs && download_if_absent && export JAVA_OPTS="$JAVA_OPTS -Deaseagent.log.conf=${EA_LOG_CONF} -javaagent:${DIR}/${JAR}=${EA_APP_CONF}" && echo done

• Resolve default value for HOSTNAME and HOSTIPV4
• Support configure application.conf and log4j2.xml file path.