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#!/bin/bash
# This script attempts to find an existing installation of Java that meets a minimum version
# requirement on a Linux machine. If it is successful, it will export a JAVA_HOME environment
# variable that can be used by another calling script.
#
# To specify the required version, set the REQUIRED_VERSION to the major version required,
# e.g. 1.3, but not 1.3.1.
REQUIRED_VERSION=1.6
# Transform the required version string into a number that can be used in comparisons
REQUIRED_VERSION=`echo $REQUIRED_VERSION | sed -e 's;\.;0;g'`
# Check JAVA_HOME directory to see if Java version is adequate
if [ $JAVA_HOME ]
then
JAVA_EXE=$JAVA_HOME/bin/java
$JAVA_EXE -version 2> tmp.ver
VERSION=`cat tmp.ver | grep "java version" | awk '{ print substr($3, 2, length($3)-2); }'`
echo $VERSION
rm tmp.ver
VERSION=`echo $VERSION | awk '{ print substr($1, 1, 3); }' | sed -e 's;\.;0;g'`
if [ $VERSION ]
then
if [ $VERSION -ge $REQUIRED_VERSION ]
then
JAVA_HOME=`echo $JAVA_EXE | awk '{ print substr($1, 1, length($1)-9); }'`
else
JAVA_HOME=
fi
else
JAVA_HOME=
fi
fi
# If the existing JAVA_HOME directory is adequate, then leave it alone
# otherwise, use 'locate' to search for other possible java candidates and
# check their versions.
if [ $JAVA_HOME ]
then
:
else
for JAVA_EXE in `locate bin/java | grep java$ | xargs echo`
do
if [ $JAVA_HOME ]
then
:
else
$JAVA_EXE -version 2> tmp.ver 1> /dev/null
VERSION=`cat tmp.ver | grep "java version" | awk '{ print substr($3, 2, length($3)-2); }'`
rm tmp.ver
VERSION=`echo $VERSION | awk '{ print substr($1, 1, 3); }' | sed -e 's;\.;0;g'`
if [ $VERSION ]
then
if [ $VERSION -ge $REQUIRED_VERSION ]
then
JAVA_HOME=`echo $JAVA_EXE`
else
echo "JAVA Version too old - Please install a new Java version"
fi
fi
fi
done
fi
# If the correct Java version is detected, then export the JAVA_HOME environment variable
if [ $JAVA_HOME ]
then
`export JAVA_HOME="$JAVA_HOME"`
export JAVA_HOME
#echo $JAVA_HOME
fi
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