bigtop-packages/src/common/bigtop-utils/bigtop-detect-javahome

#!/usr/bin/env bash
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# 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
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#
#     http://www.apache.org/licenses/LICENSE-2.0
#
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# Override JAVA_HOME in the file below if you want to disable
# automatic JAVA_HOME detection
BIGTOP_DEFAULTS_DIR=${BIGTOP_DEFAULTS_DIR-/etc/default}
[ -n "${BIGTOP_DEFAULTS_DIR}" -a -r ${BIGTOP_DEFAULTS_DIR}/bigtop-utils ] && . ${BIGTOP_DEFAULTS_DIR}/bigtop-utils

JAVA6_HOME_CANDIDATES=(
    '/usr/lib/j2sdk1.6-sun'
    '/usr/lib/jvm/java-6-sun'
    '/usr/lib/jvm/java-1.6.0-sun-1.6.0'
    '/usr/lib/jvm/j2sdk1.6-oracle'
    '/usr/lib/jvm/j2sdk1.6-oracle/jre'
    '/usr/java/jdk1.6'
    '/usr/java/jre1.6'
)

OPENJAVA6_HOME_CANDIDATES=(
    '/usr/lib/jvm/java-1.6.0-openjdk'
    '/usr/lib/jvm/java-1.6.0-openjdk-'
    '/usr/lib/jvm/jre-1.6.0-openjdk'
)

JAVA7_HOME_CANDIDATES=(
    '/usr/java/jdk1.7'
    '/usr/java/jre1.7'
    '/usr/lib/jvm/j2sdk1.7-oracle'
    '/usr/lib/jvm/j2sdk1.7-oracle/jre'
    '/usr/lib/jvm/java-7-oracle'
    '/usr/lib/jdk7-latest'
)

OPENJAVA7_HOME_CANDIDATES=(
    '/usr/lib/jvm/java-1.7.0-openjdk'
    '/usr/lib/jvm/java-7-openjdk'
)

MISCJAVA_HOME_CANDIDATES=(
    '/Library/Java/Home'
    '/usr/java/default'
    '/usr/lib/jvm/default-java'
    '/usr/lib/jvm/java-openjdk'
    '/usr/lib/jvm/jre-openjdk'
)

case ${BIGTOP_JAVA_MAJOR} in
  6) JAVA_HOME_CANDIDATES=(${JAVA6_HOME_CANDIDATES[@]})
     ;;
  7) JAVA_HOME_CANDIDATES=(${JAVA7_HOME_CANDIDATES[@]} ${OPENJAVA7_HOME_CANDIDATES[@]})
     ;;
  *) JAVA_HOME_CANDIDATES=(${JAVA6_HOME_CANDIDATES[@]}
                           ${JAVA7_HOME_CANDIDATES[@]}
                           ${MISCJAVA_HOME_CANDIDATES[@]}
                           ${OPENJAVA7_HOME_CANDIDATES[@]}
                           ${OPENJAVA6_HOME_CANDIDATES[@]})
     ;;
esac

# attempt to find java
if [ -z "${JAVA_HOME}" ]; then
  for candidate_regex in ${JAVA_HOME_CANDIDATES[@]} ; do
      for candidate in `ls -rvd ${candidate_regex}* 2>/dev/null`; do
        if [ -e ${candidate}/bin/java ]; then
          export JAVA_HOME=${candidate}
          break 2
        fi
      done
  done
fi