dont-code_ynh/scripts/ynh_install_java

#!/bin/bash

# Enable the version of java for an app, and set variables.
#
# usage: ynh_use_java
#
# `ynh_use_java` has to be used in any app scripts before using java for the first time.
# This helper will provide alias and variables to use in your scripts.
#
# To use java, use the alias `ynh_java`.
#
# Those alias will use the correct version installed for the app.
# For example: use `ynh_java -jar your-app.jar` instead of `java -jar your-app.jar`
#
# With `sudo` or `ynh_exec_as`, use instead the fallback variables `$ynh_java`
# And propagate $PATH to sudo with $ynh_java_load_PATH
# Example: `ynh_exec_as $app $ynh_java_load_PATH $ynh_java -jar yuor-app.jar`
#
# $PATH contains the path of the requested version of java.
# However, $PATH is duplicated into $java_PATH to outlast any manipulation of `$PATH`
# You can use the variable `$ynh_java_load_PATH` to quickly load your java version
# in $PATH for an usage into a separate script.
# Example: $ynh_java_load_PATH $final_path/script_that_use_java.sh`
#
#
# Finally, to start a java service with the correct version, 2 solutions
#  Either the app is dependent of java but does not call it directly.
#  In such situation, you need to load PATH :
# ```
# Environment="__JAVA_ENV_PATH__"
# ExecStart=__FINALPATH__/my_app
# ```
# You will replace __JAVA_ENV_PATH__ with $ynh_java_load_PATH.
#
#  Or java starts the app directly, then you don't need to load the PATH variable
# ```
# ExecStart=__YNH_JAVA__ -jar your-app.jar
# ```
# You will replace __YNH_JAVA__ with $ynh_java
#
#
# 2 other variables are also available
#   - $java_path: The absolute path to java binaries for the chosen version.
#   - $java_version: Just the version number of java for this app. Stored as 'java_version' in settings.yml.
#
# Requires YunoHost version 11 or higher.
ynh_use_java() {
    java_version=$(ynh_app_setting_get --app=$app --key=java_version)

    #get the architecture: amd or arm ?
    ynh_get_architecture

    # Get the absolute path of this version of java
    java_path="/usr/lib/jvm/java-$java_version-openjdk-$ynh_architecture/bin"

    # Allow alias to be used into bash script
    shopt -s expand_aliases

    # Create an alias for the specific version of node and a variable as fallback
    ynh_java="$java_path/java"
    alias ynh_java="$ynh_java"

    # Load the path of this version of node in $PATH
    if [[ :$PATH: != *":$java_path"* ]]; then
        PATH="$java_path:$PATH"
    fi
    java_PATH="$PATH"
    # Create an alias to easily load the PATH
    ynh_java_load_PATH="PATH=$java_PATH"
    # Same var but in lower case to be compatible with ynh_replace_vars...
    ynh_java_load_path="PATH=$java_PATH"
}

# Install a specific version of java
#
# ynh_install_java will install the version of Java provided as arguments.
#
# usage: ynh_install_java --java_version=java_version --jdk_type=jre --java_engine=headless
# | arg: -j, --java_version=      - Version of java to install: 17 (default) or 11. Use major version only.
# | arg: -t, --jdk_type=         - Select the type of jdk to install: jre (default) or jdk.
# | arg: -e, --java_engine=       - Select the engine to use: headless (default), zero, dcevm or leave empty for full
#
# Please look at the available Debian Openjdk packages to see the possible combinations of values. You can do so by running `apt-cache search openjdk`
# No default ones are set, please use ynh_use_java to setup environment variables to ensure the version of Java is correct
#
# Requires YunoHost version 11 or higher.
ynh_install_java() {
    # Use debian packages to install the requested Java version

    # Declare an array to define the options of this helper.
    local legacy_args=jte
    local -A args_array=([j]=java_version= [t]=jdk_type= [e]=java_engine)
    local java_version
    local jdk_type
    local java_engine
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    java_version="${java_version:-17}"
    jdk_type="${jdk_type:-jre}"
    java_engine="${java_engine:-}"

    package_name=openjdk-${java_version}-${jdk_type}
    if [ -n "$java_engine" ]; then
      package_name=${package_name}-${java_engine}
    fi

    ynh_install_app_dependencies ${package_name}

    # Store java_version into the config of this app
    ynh_app_setting_set --app=$app --key=java_version --value=$java_version
    ynh_app_setting_set --app=$app --key=jdk_type --value=$jdk_type
    ynh_app_setting_set --app=$app --key=java_engine --value=$java_engine

    ynh_use_java
}

# Remove the version of Java used by the app.
#
# As Java is installed using ynh_install_app_dependencies, it will be removed as well when you call ynh_remove_app_dependencies in your remove script
#
# usage: ynh_remove_java
ynh_remove_java () {
    local java_version=$(ynh_app_setting_get --app=$YNH_APP_INSTANCE_NAME --key=java_version)

    # Remove the lines for this app
    ynh_app_setting_delete --app=$YNH_APP_INSTANCE_NAME --key=java_version
    ynh_app_setting_delete --app=$YNH_APP_INSTANCE_NAME --key=jdk_type
    ynh_app_setting_delete --app=$YNH_APP_INSTANCE_NAME --key=java_engine

}

# Extract the architecture used to run this script
# sets ynh_architecture as arm64 or amd64
#
ynh_get_architecture() {
      uname=$(uname --machine)
      if [[ $uname =~ aarch64 || $uname =~ arm64 ]]; then
          ynh_architecture="arm64"
      else
          ynh_architecture="amd64"
      fi

}