1 files changed, 47 insertions, 0 deletions
diff --git a/libre/java-common/install_java-common.sh b/libre/java-common/install_java-common.sh
new file mode 100644
index 000000000..5ba935e2b
--- /dev/null
+++ b/libre/java-common/install_java-common.sh
@@ -0,0 +1,47 @@
+JVM_DIR=/usr/lib/jvm
+OLD_DEFAULT_NAME=java-default-runtime
+OLD_DEFAULT_PATH=${JVM_DIR}/${OLD_DEFAULT_NAME}
+DEFAULT_NAME=default
+DEFAULT_PATH=${JVM_DIR}/${DEFAULT_NAME}
+DEFAULT_NAME_JRE=default-runtime
+DEFAULT_PATH_JRE=${JVM_DIR}/${DEFAULT_NAME_JRE}
+
+# $1: Java environment name to set as default
+set_default_link_to() {
+  new_default=$1
+  unlink ${DEFAULT_PATH} 2>/dev/null
+  ln -sf ${new_default} ${DEFAULT_PATH}
+
+  unlink ${DEFAULT_PATH_JRE} 2>/dev/null
+  if [[ ${new_default} == */jre ]]; then
+    ln -sf ${new_default} ${DEFAULT_PATH_JRE}
+  else
+    ln -sf ${new_default}/jre ${DEFAULT_PATH_JRE}
+  fi
+}
+
+pre_install() {
+  _curr_def=$(readlink ${OLD_DEFAULT_PATH} && true)
+  if [ -n "${_curr_def}" ]; then
+    unlink ${OLD_DEFAULT_PATH} > /dev/null 2>&1
+    ln -sf ${DEFAULT_NAME} ${OLD_DEFAULT_PATH}
+
+    set_default_link_to ${_curr_def}
+  fi
+}
+
+pre_upgrade() {
+  pre_install "$@"
+}
+
+post_install() {
+  echo 'Installing multiple non-conflicting Java environments is now supported'
+  echo 'Check the following wiki section for more info:'
+  echo '  https://wiki.parabolagnulinux.org/index.php/Java'
+  echo 'Please make sure JAVA_HOME is set to /usr/lib/jvm/default'
+  echo 'If not, you may have to logout and login again to set it according to /etc/profile.d/jre.sh'
+}
+
+post_upgrade() {
+  post_install "$@"
+}