source: josm/trunk/native/linux/tested/usr/bin/josm

#!/bin/bash
# Simple wrapper script used to start JOSM in Debian
set -e

# First, the alternative (if known to work) or users preference as defined by $JAVA_HOME. Next, use OpenJDK.
# Override to a specific one using $JAVACMD
if [ -e "/etc/alternatives/java" ]; then
    ALTERNATIVE_JDK=$(readlink -n -f /etc/alternatives/java)
fi

if [ -v JAVA_HOME ]; then
    JAVA_CMDS="$JAVA_HOME/bin/java"
else
    JAVA_CMDS=""
fi

dpkg_java() {
    # Let's get the current architecture -- needed for multiarchified Java
    ARCH=$(dpkg --print-architecture 2> /dev/null || true)
    # If OpenJDK is only available headless, do not try it
    if dpkg --get-selections "openjdk-*-jre" | grep install$ > /dev/null \
    || dpkg --get-selections "openjdk-*-jre:$ARCH" | grep install$ > /dev/null ; then
        # LTS versions in decreased order
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-21-openjdk/bin/java /usr/lib/jvm/java-21-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-17-openjdk/bin/java /usr/lib/jvm/java-17-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-11-openjdk/bin/java /usr/lib/jvm/java-11-openjdk-$ARCH/bin/java"
        # Released versions in decreased order
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-24-openjdk/bin/java /usr/lib/jvm/java-24-openjdk-$ARCH/bin/java"
        # EOL versions in decreased order
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-23-openjdk/bin/java /usr/lib/jvm/java-23-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-22-openjdk/bin/java /usr/lib/jvm/java-22-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-20-openjdk/bin/java /usr/lib/jvm/java-20-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-19-openjdk/bin/java /usr/lib/jvm/java-19-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-18-openjdk/bin/java /usr/lib/jvm/java-18-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-16-openjdk/bin/java /usr/lib/jvm/java-16-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-15-openjdk/bin/java /usr/lib/jvm/java-15-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-14-openjdk/bin/java /usr/lib/jvm/java-14-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-13-openjdk/bin/java /usr/lib/jvm/java-13-openjdk-$ARCH/bin/java"
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-12-openjdk/bin/java /usr/lib/jvm/java-12-openjdk-$ARCH/bin/java"
        # Development version(s)
        JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/java-25-openjdk/bin/java /usr/lib/jvm/java-25-openjdk-$ARCH/bin/java"
    fi
}

java_version() {
    ${1} -version 2>&1 | head -n1 | awk -F'"' '{print $2}' | awk -F'.' '{print $1}'
}

if dpkg --version > /dev/null 2>&1; then
    dpkg_java
fi

# Undetermined version
JAVA_CMDS="${JAVA_CMDS} /usr/lib/jvm/default-java/bin/java /usr/bin/java"
JOSM_VERSION="josm"

if [ -f "/etc/default/${JOSM_VERSION}" ]; then
    # shellcheck source=/etc/default/josm
    . "/etc/default/${JOSM_VERSION}"
fi

# Java decodes file names with the character set of the locale, and -Dsun.jnu.encoding
# cannot override it. If the locale is C/POSIX, or cannot be set at all - typically a
# UTF-8 LANG whose locale is not installed, as in a Flatpak sandbox - file names are
# decoded as ASCII and opening a folder that holds a non-ASCII name fails with
# InvalidPathException. Fall back to C.UTF-8 then, which is built into glibc 2.35 and
# later. This does not change the language of JOSM: when the locale cannot be set, Java
# already falls back to English. LC_ALL is needed, as setlocale() fails as a whole if
# any category names a locale that is not installed.
if { [ -n "$(locale 2>&1 >/dev/null)" ] || [ "$(locale charmap 2>/dev/null)" = "ANSI_X3.4-1968" ]; } \
        && [ -z "$(LC_ALL=C.UTF-8 locale 2>&1 >/dev/null)" ]; then
    export LC_ALL=C.UTF-8
fi

# If there is more than 8G ram, we can use up to 75% of the memory while still leaving 2G for other things.
if [ "$(LC_ALL=C LANG=C free --mega | grep '^Mem:' | awk '{print $2}')" -gt 8192 ]; then
    # But don't set anything if JAVA_OPTS is already set.
    JAVA_OPTS="${JAVA_OPTS:=-XX:MaxRAMPercentage=75.0 -Xms256m}"
fi

JAVA_OPTS="-Djosm.restart=true -Djava.net.useSystemProxies=true $JAVA_OPTS"

if [ -z "${JAVACMD}" ] && [ -n "${ALTERNATIVE_JDK}" ]; then
    for jcmd in $JAVA_CMDS; do
        if [ "z$ALTERNATIVE_JDK" = "z$(readlink -n -f "$jcmd")" ] && [ -z "${JAVACMD}" ] && [ -x "$jcmd" ]; then
            JAVACMD="$jcmd"
            break
        fi
    done
fi

if [ -z "${JAVACMD}" ]; then
    for jcmd in $JAVA_CMDS; do
        if [ -x "$jcmd" ] && [ -z "${JAVACMD}" ]; then
            JAVACMD="$jcmd"
            break
        fi
    done
fi

if [ "$JAVACMD" ]; then
    echo "Using $JAVACMD to execute ${JOSM_VERSION}." || true
    JAVA_VERSION=$(java_version "${JAVACMD}")
    JAVAFX_HOME="${JAVAFX_HOME:-/usr/share/openjfx/lib}"
    JOSM_PATH="${JOSM_PATH:-/usr/share/${JOSM_VERSION}/${JOSM_VERSION}.jar}"
    if [[ "${JAVA_VERSION}" -ge 11 ]]; then
        if [[ -e "${JAVAFX_HOME}" ]]; then
            if [[ -n "${JOSM_MODULEPATH}" ]]; then
                JOSM_MODULEPATH="${JOSM_MODULEPATH}:${JAVAFX_HOME}"
            else
                JOSM_MODULEPATH="${JAVAFX_HOME}"
            fi

            JAVA_OPTS="--add-modules java.scripting,java.sql,javafx.controls,javafx.media,javafx.swing,javafx.web ${JAVA_OPTS}"
        else
            JAVA_OPTS="--add-modules java.scripting,java.sql ${JAVA_OPTS}"
        fi

        if [[ -n "${JOSM_MODULEPATH}" ]]; then
            JAVA_OPTS="--module-path ${JOSM_MODULEPATH} ${JAVA_OPTS}"
        fi

        JAVA_OPTS="$JAVA_OPTS --add-exports=java.base/sun.security.action=ALL-UNNAMED"
        JAVA_OPTS="$JAVA_OPTS --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED"
        JAVA_OPTS="$JAVA_OPTS --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED"
    elif [[ "${JAVA_VERSION}" -ge 9 ]]; then
        JAVA_OPTS="--add-modules java.activation,java.se.ee $JAVA_OPTS"
    fi
    set +e
    while true; do
        # shellcheck disable=SC2086
        $JAVACMD $JAVA_OPTS -jar "${JOSM_PATH}" "$@"
        if [ "z$?" != "z9" ]; then
            break
        fi
        echo ">> restarting josm..."
    done
else
    echo "No valid JVM found to run JOSM." || true
    exit 1
fi