Allow for install of distro native java

Change-Id: Ia381d62a79c15f37457da8768925bce3ddc7c3c2

elements/README.rst

@@ -3,7 +3,7 @@ Diskimage-builder tools for creation cloud images
 
 Steps how to create cloud image with Apache Hadoop installed using diskimage-builder project:
 
-1. Clone the repository "https://github.com/stackforge/diskimage-builder" locally.
+1. Clone the repository "https://github.com/stackforge/diskimage-builder" locally. Note: Make sure you have commit 43b96d91 in your clone, it provides a mapping for default-jre.
 
 .. sourcecode:: bash
 

elements/hadoop/install.d/20-setup-java

@@ -20,15 +20,19 @@ elif [ -n "$JAVA_FILE" ]; then
    install -D -g root -o root -m 0755 $(dirname $0)/$JAVA_FILE $JAVA_HOME
 fi
 
-cd $JAVA_HOME
-if echo $JAVA_FILE | grep -q -s -F .tar.gz ; then
-   echo -e "\n" | tar -zxvf $JAVA_FILE
-elif echo $JAVA_FILE | grep -q -s -F .bin ; then
-   echo -e "\n" | sh $JAVA_FILE
+if [ -z "$JAVA_FILE" ]; then
+   install-packages default-jre
 else
-   echo "Unknown file type: $JAVA_FILE. Exiting."
-   exit 1
+   cd $JAVA_HOME
+   if echo $JAVA_FILE | grep -q -s -F .tar.gz ; then
+      echo -e "\n" | tar -zxvf $JAVA_FILE
+   elif echo $JAVA_FILE | grep -q -s -F .bin ; then
+      echo -e "\n" | sh $JAVA_FILE
+   else
+      echo "Unknown file type: $JAVA_FILE. Exiting."
+      exit 1
+   fi
+   rm $JAVA_FILE
 fi
-rm $JAVA_FILE
 
 echo "Java was installed"

elements/hadoop/post-install.d/40-setup-hadoop

@@ -64,13 +64,26 @@ esac
 rm -r $tmp_dir
 
 echo "Pre-configuring Hadoop"
-filename=$(find $TARGET_ROOT/usr/java/ -maxdepth 1 -name "jdk*")
+
+# Find JAVA_HOME...
+case "$distro" in
+   Ubuntu)
+      JAVA_HOME=$(readlink -e /usr/bin/java | sed "s:bin/java::")
+   ;;
+   Fedora )
+      JAVA_HOME=$(rpm --eval '%{?java_home}')
+   ;;
+esac
+if [ -z "$JAVA_HOME" ]; then
+   JAVA_HOME=$(find $TARGET_ROOT/usr/java/ -maxdepth 1 -name "jdk*")
+fi
+
 cat >> /home/hadoop/.bashrc <<EOF
-PATH=\$PATH:/usr/sbin:$filename/bin
-JAVA_HOME=$filename
+PATH=\$PATH:/usr/sbin:$JAVA_HOME/bin
+JAVA_HOME=$JAVA_HOME
 HADOOP_HOME=/usr/share/hadoop/
 EOF
-sed -i -e "s,export JAVA_HOME=.*,export JAVA_HOME=$filename," \
+sed -i -e "s,export JAVA_HOME=.*,export JAVA_HOME=$JAVA_HOME," \
        -e "s,export HADOOP_LOG_DIR=.*,export HADOOP_LOG_DIR=/mnt/log/hadoop/\$USER," \
        -e "s,export HADOOP_SECURE_DN_LOG_DIR=.*,export HADOOP_SECURE_DN_LOG_DIR=/mnt/log/hadoop/hdfs," \
     /etc/hadoop/hadoop-env.sh

elements/hadoop/root.d/0-check

@@ -3,8 +3,7 @@ set -e
 
 if [ -z "$JAVA_DOWNLOAD_URL" ]; then
    if [ -z "$JAVA_FILE" ]; then
-      echo "JAVA_FILE and JAVA_DOWNLOAD_URL are not set. Impossible to install java. Exit"
-      exit 1
+      echo "JAVA_FILE and JAVA_DOWNLOAD_URL are not set. Proceeding with distro native Java."
    fi
 fi
 if [ -z "$DIB_HADOOP_VERSION" ]; then