#!/bin/bash

set -e -o pipefail

CDPATH=""

SCRIPT="$0"

# SCRIPT might be an arbitrarily deep series of symbolic links; loop until we
# have the concrete path
while [ -h "$SCRIPT" ] ; do
  ls=`ls -ld "$SCRIPT"`
  # Drop everything prior to ->
  link=`expr "$ls" : '.*-> \(.*\)$'`
  if expr "$link" : '/.*' > /dev/null; then
    SCRIPT="$link"
  else
    SCRIPT=`dirname "$SCRIPT"`/"$link"
  fi
done

# determine Elasticsearch home; to do this, we strip from the path until we find
# bin, and then strip bin (there is an assumption here that there is no nested
# directory under bin also named bin)
ES_HOME=`dirname "$SCRIPT"`

# now make ES_HOME absolute
ES_HOME=`cd "$ES_HOME"; pwd`

while [ "`basename "$ES_HOME"`" != "bin" ]; do
  ES_HOME=`dirname "$ES_HOME"`
done
ES_HOME=`dirname "$ES_HOME"`

# now set the classpath
ES_CLASSPATH="$ES_HOME/lib/*"

# now set the path to java
if [ -x "$JAVA_HOME/bin/java" ]; then
  JAVA="$JAVA_HOME/bin/java"
else
  set +e
  JAVA=`which java`
  set -e
fi

if [ ! -x "$JAVA" ]; then
  echo "could not find java; set JAVA_HOME or ensure java is in PATH"
  exit 1
fi

# do not let JAVA_TOOL_OPTIONS slip in (as the JVM does by default)
if [ ! -z "$JAVA_TOOL_OPTIONS" ]; then
  echo "warning: ignoring JAVA_TOOL_OPTIONS=$JAVA_TOOL_OPTIONS"
  unset JAVA_TOOL_OPTIONS
fi

# JAVA_OPTS is not a built-in JVM mechanism but some people think it is so we
# warn them that we are not observing the value of $JAVA_OPTS
if [ ! -z "$JAVA_OPTS" ]; then
  echo -n "warning: ignoring JAVA_OPTS=$JAVA_OPTS; "
  echo "pass JVM parameters via ES_JAVA_OPTS"
fi

# check the Java version
"$JAVA" -cp "$ES_CLASSPATH" org.elasticsearch.tools.launchers.JavaVersionChecker

export HOSTNAME=$HOSTNAME

if [ -z "$ES_PATH_CONF" ]; then ES_PATH_CONF="$ES_HOME"/config; fi

if [ -z "$ES_PATH_CONF" ]; then
  echo "ES_PATH_CONF must be set to the configuration path"
  exit 1
fi

if [ -z "$ES_TMPDIR" ]; then
  set +e
  mktemp --version 2>&1 | grep coreutils > /dev/null
  mktemp_coreutils=$?
  set -e
  if [ $mktemp_coreutils -eq 0 ]; then
    ES_TMPDIR=`mktemp -d --tmpdir "elasticsearch.XXXXXXXX"`
  else
    ES_TMPDIR=`mktemp -d -t elasticsearch`
  fi
fi