exec/java-exec/src/main/sh/drill-config.sh

#
# 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.
#

# included in all the drill scripts with source command
# should not be executable directly
# also should not be passed any arguments, since we need original $*
# Modelled after $HADOOP_HOME/bin/hadoop-env.sh.

# resolve links - "${BASH_SOURCE-$0}" may be a softlink

this="${BASH_SOURCE-$0}"
while [ -h "$this" ]; do
  ls=`ls -ld "$this"`
  link=`expr "$ls" : '.*-> \(.*\)$'`
  if expr "$link" : '.*/.*' > /dev/null; then
    this="$link"
  else
    this=`dirname "$this"`/"$link"
  fi
done

# convert relative path to absolute path
bin=`dirname "$this"`
script=`basename "$this"`
bin=`cd "$bin">/dev/null; pwd`
this="$bin/$script"

# the root of the drill installation
if [ -z "$DRILL_HOME" ]; then
  export DRILL_HOME=`dirname "$this"`/..
fi

#check to see if the conf dir or drill home are given as an optional arguments
while [ $# -gt 1 ]
do
  if [ "--config" = "$1" ]
  then
    shift
    confdir=$1
    shift
    DRILL_CONF_DIR=$confdir
  else
    # Presume we are at end of options and break
    break
  fi
done
 
# Allow alternate drill conf dir location.
export DRILL_CONF_DIR="${DRILL_CONF_DIR:-/etc/drill/conf}"

. "${DRILL_CONF_DIR}/drill-env.sh"

# Newer versions of glibc use an arena memory allocator that causes virtual
# memory usage to explode. Tune the variable down to prevent vmem explosion.
export MALLOC_ARENA_MAX=${MALLOC_ARENA_MAX:-4}

if [ -z "$JAVA_HOME" ]; then
  if [ -e `which java` ]; then
    SOURCE=`which java`
    while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
      DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
      SOURCE="$(readlink "$SOURCE")"
      [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
    done
    JAVA_HOME="$( cd -P "$( dirname "$SOURCE" )" && cd .. && pwd )"
  fi
  # if we didn't set it
  if [ -z "$JAVA_HOME" ]; then
    cat 1>&2 <<EOF
+======================================================================+
|      Error: JAVA_HOME is not set and Java could not be found         |
+----------------------------------------------------------------------+
| Drill requires Java 1.8                                    |
+======================================================================+
EOF
    exit 1
  fi
fi