CLOUDSTACK-6926: removed hard coded jdk dirs and setting java home using readlink and dirname

(cherry picked from commit c468228fe8)

Conflicts:
	packaging/debian/init/cloud-usage

packaging/centos63/cloud-usage.rc

@@ -46,15 +46,31 @@ USER=cloud
 unset OPTIONS
 [ -r /etc/sysconfig/default/"$SHORTNAME" ] && source /etc/sysconfig/default/"$SHORTNAME"
 
-# The first existing directory is used for JAVA_HOME (if JAVA_HOME is not defined in $DEFAULT)
-JDK_DIRS="/usr/lib/jvm/java-7-openjdk /usr/lib/jvm/java-7-openjdk-i386 /usr/lib/jvm/java-7-openjdk-amd64 /usr/lib/jvm/java-7-sun /usr/lib/jvm/jre-1.7.0 /usr/lib/j2sdk1.5-sun /usr/lib/jre-openjdk"
+setJavaHome() {
+  # use $JAVA_HOME if defined
+  if [ -n "$JAVA_HOME" ] ; then
+    return
+  fi
 
-for jdir in $JDK_DIRS; do
-    if [ -r "$jdir/bin/java" -a -z "${JAVA_HOME}" ]; then
-        JAVA_HOME="$jdir"
-    fi
-done
-export JAVA_HOME
+  # try javac first
+  java=$(which javac 2>/dev/null || :)
+
+  # try java if javac is not found
+  if [ -z "$java" ] ; then
+    java=$(which java 2>/dev/null || :)
+  fi
+
+  if [ -n "$java" ] ; then
+    JAVA_HOME=$(dirname $(dirname $(readlink -e $java)))
+    export JAVA_HOME
+    return
+  fi
+
+  # didnt find java home. exiting with error
+  exit 1
+}
+
+setJavaHome
 
 SCP=""
 DCP=""

packaging/debian/init/cloud-usage

@@ -62,17 +62,6 @@ setJavaHome() {
     return
   fi
 
-  # If everything has failed, try hardcoded paths
-  # The first existing directory is used for JAVA_HOME (if JAVA_HOME is not defined in $DEFAULT)
-  JDK_DIRS="/usr/lib/jvm/java-7-openjdk-amd64 /usr/lib/jvm/java-7-openjdk-i386 /usr/lib/jvm/java-7-oracle /usr/lib/jvm/java-7-openjdk /usr/lib/jvm/java-7-sun"
-  for jdir in $JDK_DIRS; do
-    if [ -r "$jdir/bin/java" -a -z "${JAVA_HOME}" ]; then
-      JAVA_HOME="$jdir"
-      export JAVA_HOME
-      return
-    fi
-  done
-
   # didnt find java home. exiting with error
   exit 1
 }