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feat: add prepare_jdks.sh 
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‎lib/prepare_jdks.sh‎

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#!/bin/bash
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#
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# a lib to prepare jdks by sdkman https://sdkman.io/
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#
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#_ source guard start _#
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[ -z "${__source_guard_E2AA8C4F_215B_4CDA_9816_429C7A2CD465:+dummy}" ] || return 0
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__source_guard_E2AA8C4F_215B_4CDA_9816_429C7A2CD465="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
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readonly __source_guard_E2AA8C4F_215B_4CDA_9816_429C7A2CD465
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#_ source guard end _#
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set -eEuo pipefail
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# shellcheck source=common_utils.sh
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source "$__source_guard_E2AA8C4F_215B_4CDA_9816_429C7A2CD465/common_utils.sh"
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################################################################################
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# api functions:
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#
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# - prepare_jdks::prepare_jdks
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# - prepare_jdks::switch_java_home_to_jdk
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#
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# - prepare_jdks::install_jdk_by_sdkman
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# - prepare_jdks::load_sdkman
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# - prepare_jdks::install_sdkman
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################################################################################
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prepare_jdks::install_sdkman() {
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PREPARE_JDKS_IS_THIS_TIME_INSTALLED_SDKMAN="${PREPARE_JDKS_IS_THIS_TIME_INSTALLED_SDKMAN:-false}"
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# install sdkman if not installed yet
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if [ ! -f "$HOME/.sdkman/bin/sdkman-init.sh" ]; then
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[ -d "$HOME/.sdkman" ] && rm -rf "$HOME/.sdkman"
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curl -s get.sdkman.io | bash || cu::die "fail to install sdkman"
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PREPARE_JDKS_IS_THIS_TIME_INSTALLED_SDKMAN=true
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# FIXME: hard-coded config logic
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{
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echo sdkman_auto_answer=true
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echo sdkman_auto_selfupdate=false
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echo sdkman_disable_auto_upgrade_check=true
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} >>"$HOME/.sdkman/etc/config"
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fi
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}
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# load sdkman.
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# install sdkman if not installed yet.
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prepare_jdks::load_sdkman() {
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prepare_jdks::install_sdkman
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# load sdkman if not loaded yet
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if ! command -v sdk &>/dev/null; then
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# shellcheck disable=SC1090
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cu::loose_run source "$HOME/.sdkman/bin/sdkman-init.sh"
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fi
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}
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prepare_jdks::ls_java() {
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prepare_jdks::load_sdkman
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cu::loose_run cu::log_then_run sdk ls java | sed -n '/^ Vendor/,/^===========/p'
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}
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prepare_jdks::_get_jdk_path_from_jdk_name_of_sdkman() {
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local jdk_name_of_sdkman="$1"
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echo "$SDKMAN_CANDIDATES_DIR/java/$jdk_name_of_sdkman"
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}
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# install the jdk by sdkman if not installed yet.
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prepare_jdks::install_jdk_by_sdkman() {
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prepare_jdks::load_sdkman
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local jdk_name_of_sdkman="$1"
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local jdk_home_path
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jdk_home_path="$(
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prepare_jdks::_get_jdk_path_from_jdk_name_of_sdkman "$jdk_name_of_sdkman"
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)"
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# install jdk by sdkman
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if [ ! -d "$jdk_home_path" ]; then
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cu::loose_run cu::log_then_run sdk install java "$jdk_name_of_sdkman" ||
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cu::die "fail to install jdk $jdk_name_of_sdkman by sdkman"
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fi
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}
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prepare_jdks::_prepare_one_jdk() {
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local jdk_name_of_sdkman="$1"
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local jdk_major_version="${jdk_name_of_sdkman//.*/}"
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# java_home_var_name like JDK7_HOME, JDK11_HOME
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local java_home_var_name="JDK${jdk_major_version}_HOME"
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if [ -z "${!java_home_var_name:-}" ]; then
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# 1. prepare jdk home global var
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#
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# Dynamic variable names in Bash
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# https://stackoverflow.com/a/55331060/922688
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#
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# read value of dynamic variable by:
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# "${!var_which_value_is_var_name}"
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# assign value to of dynamic variable by:
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# printf -v "$var_which_value_is_var_name" %s value
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local jdk_home_path
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jdk_home_path="$(prepare_jdks::_get_jdk_path_from_jdk_name_of_sdkman "$jdk_name_of_sdkman")"
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printf -v "$java_home_var_name" %s "${jdk_home_path}"
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JDK_HOME_VAR_NAMES=(
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${JDK_HOME_VAR_NAMES[@]:+"${JDK_HOME_VAR_NAMES[@]}"}
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"$java_home_var_name"
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)
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# 2. install jdk by sdkman
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prepare_jdks::install_jdk_by_sdkman "$jdk_name_of_sdkman"
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else
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cu::yellow_echo "$java_home_var_name is already prepared: ${!java_home_var_name}"
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cu::yellow_echo " so skip install $jdk_name_of_sdkman by sdkman"
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fi
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}
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# prepare jdks:
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#
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# usage:
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# prepare_jdks::prepare_jdks <jdk_name_of_sdkman>...
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#
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# example:
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# prepare_jdks::prepare_jdks 11.0.14-ms
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# prepare_jdks::prepare_jdks 11.0.14-ms 17.0.2-zulu
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#
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# do the below works:
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# 1. prepare jdk home global var, like
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# JDK7_HOME=/path/to/jdk7/home
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# JDK11_HOME=/path/to/jdk11/home
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# 2. prepare jdk home global array var `JDK_HOME_VAR_NAMES`, like
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# JDK_HOME_VAR_NAMES=($JDK7_HOME $JDK11_HOME)
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# 3. install jdk by sdkman
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prepare_jdks::prepare_jdks() {
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JDK_HOME_VAR_NAMES=()
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local jdk_name_of_sdkman
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for jdk_name_of_sdkman in "$@"; do
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prepare_jdks::_prepare_one_jdk "$jdk_name_of_sdkman"
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done
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cu::blue_echo "prepared jdks:"
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local java_home_var_name
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for java_home_var_name in "${JDK_HOME_VAR_NAMES[@]}"; do
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cu::blue_echo "$java_home_var_name: ${!java_home_var_name}"
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done
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}
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# usage:
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# prepare_jdks::switch_java_home_to_jdk 11
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# prepare_jdks::switch_java_home_to_jdk /path/to/java_home
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prepare_jdks::switch_java_home_to_jdk() {
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[ $# == 1 ] || cu::die "${FUNCNAME[0]} need 1 argument! But provided: $*"
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local -r switch_target="$1"
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[ -n "$switch_target" ] || cu::die "jdk $switch_target is blank"
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if cu::is_number_string "$switch_target"; then
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# set by java version, e.g.
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# prepare_jdks::switch_java_home_to_jdk 11
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local java_home_var_name="JDK${switch_target}_HOME"
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export JAVA_HOME="${!java_home_var_name:-}"
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[ -n "$JAVA_HOME" ] || cu::die "JAVA_HOME of java version $switch_target($java_home_var_name) is unset or blank: $JAVA_HOME"
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else
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# set by java home path
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export JAVA_HOME="$switch_target"
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fi
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[ -e "$JAVA_HOME" ] || cu::die "jdk $switch_target NOT existed: $JAVA_HOME"
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[ -d "$JAVA_HOME" ] || cu::die "jdk $switch_target is NOT directory: $JAVA_HOME"
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local java_cmd="$JAVA_HOME/bin/java"
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[ -f "$java_cmd" ] || cu::die "\$JAVA_HOME/bin/java ($java_cmd) is NOT found!"
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[ -x "$java_cmd" ] || cu::die "\$JAVA_HOME/bin/java ($java_cmd) is NOT executable!"
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}
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################################################################################
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# auto load sdkman.
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# disable by define `PREPARE_JDKS_NO_AUTO_LOAD_SDKMAN` var
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#
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# auto prepare jdks,
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# if `PREPARE_JDKS_INSTALL_BY_SDKMAN` is has values
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################################################################################
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if [ -z "${PREPARE_JDKS_NO_AUTO_LOAD_SDKMAN+defined}" ]; then
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prepare_jdks::load_sdkman
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fi
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if "$PREPARE_JDKS_IS_THIS_TIME_INSTALLED_SDKMAN"; then
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prepare_jdks::ls_java
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fi
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if [ -n "${PREPARE_JDKS_INSTALL_BY_SDKMAN:+has_values}" ]; then
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prepare_jdks::prepare_jdks "${PREPARE_JDKS_INSTALL_BY_SDKMAN[@]}"
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fi

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