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#! /bin/bash
# Arch Linux 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>
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 ${dir}/bin/java ]; then
javas+=(${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 [[ -d ${new_default}/jre ]]; then
ln -sf ${new_default}/jre ${DEFAULT_PATH_JRE}
else
ln -sf ${new_default} ${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 ${installed_java[@]}; do
# We discoverd this Java env but its JRE is actually set as default
if [ "${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 'archlinux-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 its parent is also a valid Java environment
if is_java_valid $(dirname ${default}); then
unset_default_link
set_default_link_to $(dirname ${default})
fi
else
prev=$(readlink ${DEFAULT_PATH})
unset_default_link
potential_fixes=("${prev/\/jre}" "${prev}/jre")
openjdk8=('java-8-openjdk' 'java-8-openjdk/jre')
# List of environments to check by order of preference:
# - first potential fixes of user choices,
# - then OpenJDK8 as it is considered a default in Arch Linux
# - finally, any installed environment
to_check=(${potential_fixes[@]} ${openjdk8[@]} $(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
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