#! /bin/bash # Parabola GNU/linux-libre helper script to set/unset/check/fix the enabled Java environment # This program may be freely redistributed under the terms of the GNU General Public License # # Author: Guillaume ALAUX <guillaume@archlinux.org> # Parabola Rebranding Author: André Silva <emulatorman@parabola.nu> JVM_DIR=/usr/lib/jvm DEFAULT_NAME=default DEFAULT_PATH=${JVM_DIR}/${DEFAULT_NAME} DEFAULT_NAME_JRE=default-runtime DEFAULT_PATH_JRE=${JVM_DIR}/${DEFAULT_NAME_JRE} # Utility functions check_root() { if [ $(id -u) -ne 0 ]; then echo 'This script must be run as root' exit 1 fi } # $1: parameter count given to this script for this option # $2: expected parameter count for this option check_param_count() { if [ $1 -ne $2 ]; then echo 'Wrong parameter count' exit 2 fi } # Second level functions get_default_java() { path=$(readlink -e ${DEFAULT_PATH}) if [ "x${path}" != "x/dev/null" ]; then echo ${path/${JVM_DIR}\/} else echo "" fi } get_installed_javas() { if [ -d ${JVM_DIR} ]; then for dir in $(find ${JVM_DIR} -mindepth 1 -maxdepth 1 -type d | sort); do if [ -x ${dir}/bin/javac ]; then javas+=(${dir/${JVM_DIR}\/}) else if [ -x ${dir}/jre/bin/java ]; then javas+=(${dir/${JVM_DIR}\/}/jre) fi fi done fi echo ${javas[@]} } # $1: Java environment name to test is_java_valid() { test "x$1" != "x${DEFAULT_NAME}" && test -x ${JVM_DIR}/$1/bin/java } # $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 } unset_default_link() { unlink ${DEFAULT_PATH} 2>/dev/null unlink ${DEFAULT_PATH_JRE} 2>/dev/null } # First level functions do_status() { installed_java=($(get_installed_javas)) if [ ${#installed_java[@]} -eq 0 ]; then echo 'No compatible Java environment installed' else default_java=$(get_default_java) echo 'Available Java environments:' for java in ${installed_java[@]}; do if [ "${java}/jre" = "${default_java}" ]; then echo -e " ${java} (${java}/jre default)" elif [ ${java} = "${default_java}" ]; then echo -e " ${java} (default)" else echo " ${java}" fi done if [ -z ${default_java} ]; then echo "No Java environment set as default" fi fi } do_get() { get_default_java } # $1: Java environment name to set as default do_set() { if ! is_java_valid $1; then echo "'${JVM_DIR}/$1' is not a valid Java environment path" exit 1 fi default=$(get_default_java) if [ "x$1" != "x${default}" ] || ! is_java_valid ${default}; then unset_default_link set_default_link_to $1 fi #parent_dir=$(dirname $1) #if is_java_valid ${parent_dir}; then # echo "Warning: '${parent_dir}' looks like a valid JDK whereas '$1' is set as default" # echo "Fix this with 'parabola-java set ${parent_dir}'" #fi } # $1: Java environment name to unset do_unset() { unset_default_link } do_fix() { default=$(get_default_java) if is_java_valid ${default}; then if is_java_valid $(dirname ${default}); then unset_default_link set_default_link_to $(dirname ${default}) fi else prev=$(readlink ${DEFAULT_PATH}) unset_default_link prev_fix=("${prev/\/jre}" "${prev}/jre") openjdk7=('java-7-openjdk' 'java-7-openjdk/jre') to_check=(${prev_fix[@]} ${openjdk7[@]} $(get_installed_javas)) for java in ${to_check[@]}; do if ! is_java_valid $(get_default_java) && is_java_valid ${java}; then set_default_link_to ${java} fi done fi if ! is_java_valid $(get_default_java); then echo 'No valid Java environment found' fi } usage() { echo "$(basename $0) <COMMAND>" echo -e "\nCOMMAND:" echo -e '\tstatus\t\tList installed Java environments and enabled one' echo -e '\tget\t\tReturn the short name of the Java environment set as default' echo -e '\tset <JAVA_ENV>\tForce <JAVA_ENV> as default' echo -e '\tunset\t\tUnset current default Java environment' echo -e '\tfix\t\tFix an invalid/broken default Java environment configuration' } ## Main case $1 in 'status') do_status;; 'get') do_get;; 'set') check_root; check_param_count $# 2; do_set $2;; 'unset') check_root; do_unset;; 'fix') check_root; do_fix;; 'help' | '--help' | '-h' | '') usage;; *) echo "$(basename $0): unknown option '$@'"; exit 1;; esac