#!/bin/sh
# shellcheck shell=dash   # local variable support
# shellcheck disable=1007 # spurious warnings when initializing multiple vars

# -----------------------------------------------------------------------------
# jruby.sh - Start Script for the JRuby interpreter
#
# This script handles all Ruby and JRuby command-line arguments, detects the
# location of the `java` command and JRuby standard library, and launches JRuby
# using appropriate flags and configuration. A few flags provide additional
# information:
#
# * `jruby --help` for standard options, most based on Ruby flags.
# * `jruby --properties` to list all JRuby JVM properties for finer-grained
#   configuration.
# * `jruby --environment` to show the `java` command line that will be run and
#   log output explaining how we got there.
#
# This script is intended to be compatible with POSIX shell as much as possible
# modulo a few small features known to be nonstandard but present in nearly all
# POSIX shell implementations. We tell shellcheck to treat this source as dash,
# a version of ash that adds those features and which has been the standard
# Debian /bin/sh since 2011.
#
# See https://en.wikipedia.org/wiki/Almquist_shell#Adoption_in_Debian_and_Ubuntu
#
# There are a number of utility functions defined here to cope with the lack of
# arrays in shell. These functions simulate arrays through other mechanism and
# ensure we do not damage quoting during argument processing.
# -----------------------------------------------------------------------------

# Enable uninitialized variable warnings
set -u

# ----- Guarantee local variables are available -------------------------------
if command -v local >/dev/null; then
    :
elif command -v typeset >/dev/null; then
    # ksh93 and older have typeset but not local, and expand aliases at parse
    # time so require re-sourcing the script
    alias local=typeset
    if [ -z "${KSH_VERSION-}" ] || (eval : '"${.sh.version}"' >/dev/null 2>&1); then
        # shellcheck source=/dev/null
        . "$0"
        exit
    fi
else
    echo >&2 "Error: Your shell does not support local variables. Re-run this script with one that does (e.g. bash, ksh)"
    exit 1
fi

# ----- Helper functions ------------------------------------------------------

# esceval [ARGUMENT...]
#
# Escape ARGUMENT for safe use with eval
# Returns escaped arguments via $REPLY
# Thanks to @mentalisttraceur for original implementation:
# https://github.com/mentalisttraceur/esceval
esceval()
{
    local escaped= unescaped= output=
    REPLY=

    [ $# -gt 0 ] || return 0
    while true; do
        escaped=\'
        unescaped=$1
        while true; do
            case $unescaped in
                (*\'*)
                    escaped="$escaped${unescaped%%\'*}'\''"
                    unescaped=${unescaped#*\'}
                    ;;
                (*) break ;;
            esac
        done
        escaped=$escaped$unescaped\'
        shift
        [ $# -gt 0 ] || break
        output="$output $escaped"
    done
    REPLY="$output $escaped"
}

# assign LISTNAME ELEMENT [ELEMENT...]
#
# Assign ELEMENT to the list named by LISTNAME.
assign() {
    local listname="$1"
    local REPLY=
    shift

    esceval "$@"
    eval "$listname=\"\${REPLY}\""
}

# append LISTNAME ELEMENT [ELEMENT...]
#
# Append ELEMENT to the list named by LISTNAME.
append() {
    local listname="$1"
    local REPLY=
    shift

    esceval "$@"
    eval "$listname=\"\${$listname} \${REPLY}\""
}

# prepend LISTNAME ELEMENT [ELEMENT...]
#
# Prepend ELEMENT to the list named by LISTNAME, preserving order.
prepend() {
    local listname="$1"
    local REPLY=
    shift

    esceval "$@"
    eval "$listname=\"\${REPLY} \${$listname}\""
}

# extend LISTNAME1 LISTNAME2
#
# Append the elements stored in the list named by LISTNAME2
# to the list named by LISTNAME1.
extend() {
    eval "$1=\"\${$1} \${$2}\""
}

# preextend LISTNAME1 LISTNAME2
#
# Prepend the elements stored in the list named by LISTNAME2
# to the named by LISTNAME1, preserving order.
preextend() {
    eval "$1=\"\${$2} \${$1}\""
}

# a_isempty
#
# Return 0 if an array is empty, otherwise return 1
a_isempty() {
    case $ruby_args in
        (*[![:space:]]*) return 1 ;;  # If any nonblank, not empty
    esac
    return 0
}

# exists [FILE...]
#
# Returns 0 if all FILEs exist or none provided, otherwise returns 1
exists() {
    while [ "$#" -gt 0 ]; do
        [ -e "$1" ] || return
        shift
    done

    return 0
}

# is_newer FILE OTHER...
#
# Returns 0 if FILE is newer than all OTHER files. If FILE doesn't exist,
# return error. If OTHER files don't exist, pretend they're older than FILE.
is_newer() {
    local output master
    master="$1"
    shift

    # Find any other files that are newer, negate outside find in case any don't exist
    [ -e "$master" ] && ! find "$@" -newer "$master" 2>/dev/null | read -r _
}

# echo [STRING...]
#
# Dumb echo, i.e. print arguments joined by spaces with no further processing
echo() {
    printf "%s\n" "$*"
}

# ----- Set variable defaults -------------------------------------------------

java_class=org.jruby.Main
JRUBY_SHELL=/bin/sh

# Detect cygwin and mingw environments
cygwin=false
case "$(uname)" in
    CYGWIN*) cygwin=true ;;
    MINGW*)
        release_id=$(awk -F= '$1=="ID" { print $2; }' /etc/os-release 2> /dev/null)
        case $release_id in
            "msys2") ;;
            *)
                jruby.exe "$@"
                exit $?
                ;;
        esac
        ;;
esac
readonly cygwin

use_exec=true
jdb=false

NO_BOOTCLASSPATH=false
VERIFY_JRUBY=false
print_environment_log=false
regenerate_jsa_file=false
remove_jsa_files=false
log_cds=false

if [ -z "${JRUBY_OPTS-}" ]; then
    JRUBY_OPTS=""
fi

if [ -z "${JAVA_STACK-}" ]; then
    JAVA_STACK=-Xss2048k
fi

java_args=""
ruby_args=""

# shellcheck disable=2034 # variable is only read in an eval
java_opts_from_files=""
# shellcheck disable=2034 # variable is only read in an eval
jdb_args=""

# Force OpenJDK-based JVMs to use /dev/urandom for random number generation
# See https://github.com/jruby/jruby/issues/4685 among others.
# OpenJDK tries really hard to prevent you from using urandom.
# See https://bugs.openjdk.java.net/browse/JDK-6202721
# Non-file URL causes fallback to slow threaded SeedGenerator.
# See https://bz.apache.org/bugzilla/show_bug.cgi?id=56139
if [ -r "/dev/urandom" ]; then
    JAVA_SECURITY_EGD="file:/dev/urandom"
fi

# Gather environment information as we go
readonly cr='
'
environment_log="JRuby Environment$cr================="
add_log() {
    environment_log="${environment_log}${cr}${*-}"
}

# Logic to process "arguments files" on both Java 8 and Java 9+
process_java_opts() {
    local java_opts_file="$1"
    if [ -r "$java_opts_file" ]; then
        add_log
        add_log "Adding Java options from: $java_opts_file"

        # On Java 9+, add an @argument for the given file.
        # On earlier versions the file contents will be read and expanded on the Java command line.
        if $use_modules; then
            append java_opts_from_files "@$java_opts_file"
        else
            local line=
            while read -r line; do
                if [ "$line" ]; then
                    # shellcheck disable=2086  # Split options on whitespace
                    append java_opts_from_files $line
                    add_log "  $line"
                fi
            done < "$java_opts_file"
        fi
    fi
}

# Pure shell dirname/basename
dir_name() {
    local filename="$1" trail=
    case $filename in
        */*[!/]*)
            trail=${filename##*[!/]}
            filename=${filename%%"$trail"}
            REPLY=${filename%/*}
            ;;
        *[!/]*)
            trail=${filename##*[!/]}
            REPLY="."
            ;;
        *)
            REPLY="/"
            ;;
    esac
}

base_name() {
    local filename="$1" trail=
    case $filename in
        */*[!/]*)
            trail=${filename##*[!/]}
            filename=${filename%%"$trail"}
            REPLY=${filename##*/}
            ;;
        *[!/]*)
            trail=${filename##*[!/]}
            REPLY=${filename%%"$trail"}
            ;;
        *)
            REPLY="/"
            ;;
    esac
}

# Determine whether path is absolute and contains no relative segments or symlinks
path_is_canonical() {
    local path=
    for path; do
        case $path in
            ([!/]*) return 1 ;;
            (./*|../*) return 1 ;;
            (*/.|*/..) return 1 ;;
            (*/./*|*/../*) return 1 ;;
        esac
        while [ "$path" ]; do
            [ -h "$path" ] && return 1
            path="${path%/*}"
        done
    done
    return 0
}

# Resolve directory to its canonical value
resolve_dir() {
    # Some shells (dash, ksh) resolve relative paths by default before cd'ing, i.e.
    # cd /foo/bar/../baz = cd /foo/baz
    # This is fine unless bar is a symlink, in which case the second form is
    # invalid. Passing -P to cd fixes this behaviour.
    REPLY="$(cd -P -- "$1" && pwd)"
}

# Resolve symlink until it's not a symlink
resolve_file() {
    local current="$1" target=

    while [ -h "$current" ]; do
        target="$(readlink "$current")" || return
        case $target in
            (/*) current="$target" ;;
            # handle relative symlinks
            (*) dir_name "$current"; current="$REPLY/$target" ;;
        esac
    done
    REPLY="$current"
}

# Resolve path to its canonical value
resolve() {
    local target="$1" base=
    REPLY=

    # Verify target actually exists (and isn't too deep in symlinks)
    if ! [ -e "$target" ]; then
        echo >&2 "Error: No such file or directory: $target"
        return 1
    fi

    # Realpath is way faster than repeatedly calling readlink, so use it if possible
    if command -v realpath >/dev/null; then
        REPLY="$(realpath "$target")" && return
    fi

    # Take shortcut for directories
    if [ -d "$target" ]; then
        resolve_dir "$target" && return
    fi

    # Ensure $target is not a symlink
    resolve_file "$target" || return
    target="$REPLY"

    # Resolve parent directory if it's not absolute
    if ! path_is_canonical "$target"; then
        dir_name "$target"
        resolve_dir "$REPLY" || return
        base="$REPLY"

        base_name "$target"
        target="$base/$REPLY"
    fi
    REPLY="$target"
}

# ----- Determine JRUBY_HOME based on this executable's path ------------------

# get the absolute path of the executable
if [ "${BASH-}" ]; then
    # shellcheck disable=2128,3028
    script_src="${BASH_SOURCE-}"
else
    script_src="$0"
fi
dir_name "$script_src"
BASE_DIR="$(cd -P -- "$REPLY" >/dev/null && pwd -P)"
base_name "$script_src"
resolve "$BASE_DIR/$REPLY"
SELF_PATH="$REPLY"

JRUBY_HOME="${SELF_PATH%/*/*}"

# ----- File paths for various options and files we'll process later ----------

# Module options to open up packages we need to reflect
readonly jruby_module_opts_file="$JRUBY_HOME/bin/.jruby.module_opts"

# Cascading .java_opts files for localized JVM flags
readonly installed_jruby_java_opts_file="$JRUBY_HOME/bin/.jruby.java_opts"
if [ -z "${HOME-}" ]; then
    readonly home_jruby_java_opts_file=""
else
    readonly home_jruby_java_opts_file="$HOME/.jruby.java_opts"
fi
readonly pwd_jruby_java_opts_file="$PWD/.jruby.java_opts"

# Options from .dev_mode.java_opts for "--dev" mode, to reduce JRuby startup time
readonly dev_mode_opts_file="$JRUBY_HOME/bin/.dev_mode.java_opts"

# ----- Initialize environment log --------------------------------------------

add_log
add_log "JRuby executable:"
add_log "  $script_src"
add_log "JRuby command line options:"
add_log "  $*"
add_log "Current directory:"
add_log "  $PWD"

add_log
add_log "Environment:"
add_log "  JRUBY_HOME: $JRUBY_HOME"
add_log "  JRUBY_OPTS: $JRUBY_OPTS"
add_log "  JAVA_OPTS: ${JAVA_OPTS-}"

# ----- Discover JVM and prep environment to run it ---------------------------

# Determine where the java command is and ensure we have a good JAVA_HOME
if [ -z "${JAVACMD-}" ]; then
    if [ -z "${JAVA_HOME-}" ]; then
        readonly java_home_command="/usr/libexec/java_home"
        if [ -r "$java_home_command" ] \
            && [ -x "$java_home_command" ] \
            && [ ! -d "$java_home_command" ]
        then
            # use java_home command when none is set (on MacOS)
            JAVA_HOME="$("$java_home_command")" &&
            JAVACMD="$JAVA_HOME"/bin/java
        else
            # Linux and others have a chain of symlinks
            JAVACMD="$(command -v java)" &&
            resolve "$JAVACMD" &&
            JAVACMD="$REPLY"
        fi
    elif $cygwin; then
        JAVACMD="$(cygpath -u "$JAVA_HOME")/bin/java"
    else
        resolve "$JAVA_HOME/bin/java" &&
        JAVACMD="$REPLY"
    fi
else
    JAVACMD="$(command -v "$JAVACMD")" &&
    resolve "$JAVACMD" &&
    JAVACMD="$REPLY"
fi || {
    # Something went wrong when looking for java
    echo >&2 "${0##*/}: Error: Java executable not found!"
    exit 2
}

# export separately from command execution
dir_name "$JAVACMD"
dir_name "$REPLY"
JAVA_HOME="$REPLY"

# Detect modularized Java
java_is_modular() {
    # check that modules file is present
    if [ -f "$JAVA_HOME"/lib/modules ]; then
        return 0
    fi

    # check if a MODULES line appears in release
    if [ -f "$JAVA_HOME"/release ] && grep -q ^MODULES "$JAVA_HOME"/release; then
        return 0
    fi

    return 1
}

if java_is_modular; then
    use_modules=true
else
    use_modules=false
fi
readonly use_modules

add_log "  JAVACMD: $JAVACMD"
add_log "  JAVA_HOME: $JAVA_HOME"

if $use_modules; then
    add_log
    add_log "Detected Java modules at $JAVA_HOME"
fi

# ----- Detect Java version and determine available features ------------------
# shellcheck source=/dev/null
if [ -f "$JAVA_HOME/release" ]; then
    java_version=$(. "$JAVA_HOME/release" && echo "${JAVA_VERSION-}")

    # convert version to major, considering 1.8 as 8
    case $java_version in
        1.8 | 1.8.*) java_major=8 ;;
        *)           java_major=${java_version%%.*} ;;
    esac
else
    # assume Java 8 if no release file
    java_version=1.8
    java_major=8
fi

# shellcheck source=/dev/null
if [ -f "$JRUBY_HOME/bin/.java-version" ] && . "$JRUBY_HOME/bin/.java-version" && [ "${JRUBY_MINIMUM_JAVA_VERSION-}" ]; then
    minimum_java_version=$JRUBY_MINIMUM_JAVA_VERSION
else
    # Only 9.4.12.0 and earlier will have shipped without a .java-version file, so fall back on minimum of 8
    minimum_java_version=8
fi
add_log "Detected Java version: $java_version"

# Present a useful error if running a Java version lower than bin/.java-version
if [ "$java_major" -lt "$minimum_java_version" ]; then
    echo "This version of JRuby requires Java ${minimum_java_version}+."
    echo "Make sure JAVA_HOME points at JDK ${minimum_java_version} or higher"
    echo "Detected Java version: $java_version"
    echo "Detected JAVA_HOME: $JAVA_HOME"
    exit 1
fi

# AppCDS support
if [ "$java_major" -ge 13 ] && exists "$JAVA_HOME"/lib/server/*.jsa; then
    java_has_appcds=true
else
    java_has_appcds=false
fi
readonly java_has_appcds

# Default to using AppCDS if available
use_jsa_file="$java_has_appcds"

# AppCDS autogeneration
if [ "$java_major" -ge 19 ]; then
    java_has_appcds_autogenerate=true
else
    java_has_appcds_autogenerate=false
fi
readonly java_has_appcds_autogenerate

# Native access
if [ "$java_major" -ge 22 ]; then
    enable_native_access=true
else
    enable_native_access=false
fi
readonly enable_native_access

# Unsafe memory access
if [ "$java_major" -ge 23 ]; then
    enable_unsafe_memory=true
else
    enable_unsafe_memory=false
fi
readonly enable_unsafe_memory

# ----- Process .java_opts files ----------------------------------------------

# We include options on the java command line in the following order:
#
# * JRuby installed bin/.jruby.java_opts (empty by default)
# * user directory .jruby.java_opts
# * current directory .jruby.java_opts
# * dev mode options from bin/.dev_mode.java_opts, if --dev is specified
# * module options from bin/.jruby.module_opts if modules are detected
# * JAVA_OPTS environment variable
# * command line flags

# Add local and global .jruby.java_opts
process_java_opts "$installed_jruby_java_opts_file"
process_java_opts "$home_jruby_java_opts_file"
process_java_opts "$pwd_jruby_java_opts_file"

# Capture some Java options to be passed separately
JAVA_OPTS_TEMP=""
for opt in ${JAVA_OPTS-}; do
    case $opt in
        -Xmx*) JAVA_MEM="$opt" ;;
        -Xss*) JAVA_STACK="$opt" ;;
        *) JAVA_OPTS_TEMP="$JAVA_OPTS_TEMP $opt" ;;
    esac
done

JAVA_OPTS="$JAVA_OPTS_TEMP"

# ----- Set up the JRuby class/module path ------------------------------------

CP_DELIMITER=":"

# Find main jruby jar and add it to the classpath
jruby_jar=
for j in "$JRUBY_HOME"/lib/jruby.jar "$JRUBY_HOME"/lib/jruby-complete.jar; do
    if [ ! -e "$j" ]; then
        continue
    fi
    if [ "${JRUBY_CP-}" ]; then
        JRUBY_CP="$JRUBY_CP$CP_DELIMITER$j"
    else
        JRUBY_CP="$j"
    fi
    if [ -n "$jruby_jar" ]; then
        echo "WARNING: more than one JRuby JAR found in lib directory" 1>&2
    fi
    jruby_jar="$j"
done
readonly jruby_jar

if $cygwin; then
    JRUBY_CP="$(cygpath -p -w "$JRUBY_CP")"
fi

# ----- Add additional jars from lib to classpath -----------------------------

if [ "${JRUBY_PARENT_CLASSPATH-}" ]; then
    # Use same classpath propagated from parent jruby
    CP="$JRUBY_PARENT_CLASSPATH"
else
    # add other jars in lib to CP for command-line execution
    for j in "$JRUBY_HOME"/lib/*.jar; do
        case "${j#"$JRUBY_HOME/lib/"}" in
            jruby.jar|jruby-complete.jar) continue
        esac
        if [ -z "${CP-}" ]; then
            CP="$j"
        else
            CP="$CP$CP_DELIMITER$j"
        fi
    done

    if [ "${CP-}" ] && $cygwin; then
        CP="$(cygpath -p -w "$CP")"
    fi
fi

if $cygwin; then
    # switch delimiter only after building Unix style classpaths
    CP_DELIMITER=";"
fi

readonly CP_DELIMITER

# ----- Continue processing JRuby options into JVM options --------------------

# Split out any -J argument for passing to the JVM.
# Scanning for args is aborted by '--'.
# shellcheck disable=2086
set -- $JRUBY_OPTS "$@"
# increment pointer, permute arguments
while [ $# -gt 0 ]
do
    case $1 in
        # Stuff after '-J' in this argument goes to JVM
        -J-Xmx*) JAVA_MEM="${1#-J}" ;;
        -J-Xss*) JAVA_STACK="${1#-J}" ;;
        -J)
            "$JAVACMD" -help
            echo "(Prepend -J in front of these options when using 'jruby' command)" 1>&2
            exit
            ;;
        -J-X)
            "$JAVACMD" -X
            echo "(Prepend -J in front of these options when using 'jruby' command)" 1>&2
            exit
            ;;
        -J-classpath|-J-cp)
            if [ -z "${CP-}" ]; then
                CP="$2"
            else
              CP="$CP$CP_DELIMITER$2"
            fi
            CLASSPATH=""
            shift
            ;;
        -J-ea*)
            VERIFY_JRUBY=true
            append java_args "${1#-J}"
            ;;
        -J-Djava.security.egd=*) JAVA_SECURITY_EGD=${1#-J-Djava.security.egd=} ;;
        # This must be the last check for -J
        -J*) append java_args "${1#-J}" ;;
        # Pass -X... and -X? search options through
        -X*...|-X*\?) append ruby_args "$1" ;;
        # Match -Xa.b.c=d to translate to -Da.b.c=d as a java option
        -X*.*) append java_args -Djruby."${1#-X}" ;;
        # Match switches that take an argument
        -[CeIS])
            append ruby_args "$1" "$2"
            shift
            ;;
        # Run with JMX management enabled
        --manage)
            append java_args -Dcom.sun.management.jmxremote
            append java_args -Djruby.management.enabled=true
            ;;
        # Don't launch a GUI window, no matter what
        --headless) append java_args -Djava.awt.headless=true ;;
        # Run under JDB
        --jdb)
            jdb=true
            if [ -z "$JAVA_HOME" ]; then
                JAVACMD='jdb'
            else
                if $cygwin; then
                    JAVACMD="$(cygpath -u "$JAVA_HOME")/bin/jdb"
                else
                    JAVACMD="$JAVA_HOME/bin/jdb"
                fi
            fi
            JDB_SOURCEPATH="${JRUBY_HOME}/core/src/main/java:${JRUBY_HOME}/lib/ruby/stdlib:."
            append jdb_args -sourcepath "$JDB_SOURCEPATH"
            append ruby_args -X+C
            ;;
        --client|--server|--noclient)
            echo "Warning: the $1 flag is deprecated and has no effect most JVMs" 1>&2
            ;;
        --dev)
            process_java_opts "$dev_mode_opts_file"
            # For OpenJ9 use environment variable to enable quickstart and shareclasses
            export OPENJ9_JAVA_OPTIONS="-Xquickstart -Xshareclasses"
            ;;
        --sample) append java_args -Xprof ;;
        --record)
            append java_args -XX:+FlightRecorder -XX:StartFlightRecording=dumponexit=true
            ;;
        --no-bootclasspath) NO_BOOTCLASSPATH=true ;;
        --ng*)
            echo "Error: Nailgun is no longer supported" 1>&2
            exit 1
            ;;
        --environment) print_environment_log=true ;;
        # warn but ignore
        --1.8|--1.9|--2.0) echo "warning: $1 ignored" 1>&2 ;;
        --checkpoint=*|--checkpoint|--restore=*|--restore)
            echo "CRaC not supported on Debian" 1>&2
            exit 1
            ;;
        --cache)
            if ! $java_has_appcds; then
                echo "Error: Java $java_major doesn't support automatic AppCDS" >&2
                exit 2
            fi
            regenerate_jsa_file=true  # Force regeneration of archive
            ;;
        --nocache) use_jsa_file=false ;;
        --rmcache) remove_jsa_files=true ;;
        --logcache) log_cds=true ;;
        # Abort processing on the double dash
        --) break ;;
        # Other opts go to ruby
        -*) append ruby_args "$1" ;;
        # Abort processing on first non-opt arg
        *) break ;;
    esac
    shift
done

# Force JDK to use specified java.security.egd rand source
if [ -n "${JAVA_SECURITY_EGD-}" ]; then
    append java_args "-Djava.security.egd=$JAVA_SECURITY_EGD"
fi

# The rest of the arguments are for ruby
append ruby_args "$@"

JAVA_OPTS="$JAVA_OPTS ${JAVA_MEM-} ${JAVA_STACK-}"

JFFI_OPTS="-Djffi.boot.library.path=$JRUBY_HOME/lib/jni"

CLASSPATH="${CP-}${CP_DELIMITER}${CLASSPATH-}"

# ----- Module and Class Data Sharing flags for Java 9+ -----------------------

if $use_modules; then
    # Switch to non-boot path since we can't use bootclasspath on 9+
    NO_BOOTCLASSPATH=true

    # Add base opens we need for Ruby compatibility
    process_java_opts "$jruby_module_opts_file"
fi

# Default JVM Class Data Sharing Archive (jsa) file for JVMs that support it
if [ -n "${XDG_CACHE_HOME-}" ] || [ -n "${HOME-}" ]; then
    readonly jruby_jsa_file="${XDG_CACHE_HOME:-$HOME/.cache}/jruby-java$java_version.jsa"

    # Find JSAs for all Java versions
    assign jruby_jsa_files "${XDG_CACHE_HOME:-$HOME/.cache}"/jruby-java*.jsa
    readonly jruby_jsa_files
else
    jruby_jsa_file="$JRUBY_HOME/lib/jruby-java$java_version.jsa"
fi

# Allow overriding default JSA file location
if [ -n "${JRUBY_JSA-}" ]; then
    jruby_jsa_file="$JRUBY_JSA"
fi

# Ensure the AppCDS parent directory is actually writable
if dir_name "$jruby_jsa_file" && ! [ -w "$REPLY" ]; then
    if $use_jsa_file || $regenerate_jsa_file || $remove_jsa_files; then
        echo "Warning: AppCDS archive directory is not writable, disabling AppCDS operations" >&2
    fi
    regenerate_jsa_file=false
    remove_jsa_files=false
    use_jsa_file=false
fi

# Initialize AppCDS
if $use_jsa_file; then
    # Default to no-op script when explicitly generating
    if $regenerate_jsa_file && a_isempty "$ruby_args"; then
        append ruby_args -e 1
    fi

    # Archive should be regenerated manually if requested or it's outdated relative to JRuby
    if ! $regenerate_jsa_file && is_newer "$jruby_jar" "$jruby_jsa_file"; then
        regenerate_jsa_file=true
    fi

    # Defer generation to Java if flag is available
    if $java_has_appcds_autogenerate; then
        append java_args -XX:+AutoCreateSharedArchive

        add_log
        add_log "Automatically generating and using CDS archive at:"
        add_log "  $jruby_jsa_file"
    fi

    # Determine if we should read or explicitly write the archive
    if $regenerate_jsa_file && ! $java_has_appcds_autogenerate; then
        # Explicitly create archive if outdated
        append java_args -XX:ArchiveClassesAtExit="$jruby_jsa_file"

        add_log
        add_log "Regenerating CDS archive at:"
        add_log "  $jruby_jsa_file"
    else
        # Read archive if not explicitly regenerating
        append java_args -XX:SharedArchiveFile="$jruby_jsa_file"

        if ! $java_has_appcds_autogenerate; then
            add_log
            add_log "Using CDS archive at:"
            add_log "  $jruby_jsa_file"
        fi
    fi

    if $log_cds; then
        add_log "Logging CDS output to:"
        add_log "  $jruby_jsa_file.log"
        append java_args -Xlog:cds=info:file="$jruby_jsa_file".log
        append java_args -Xlog:cds+dynamic=info:file="$jruby_jsa_file".log
    else
        append java_args -Xlog:cds=off -Xlog:cds+dynamic=off
    fi
fi

# Enable access to native libraries
if $enable_native_access; then
    append java_args --enable-native-access=org.jruby.dist
fi

# Enable access to Unsafe memory functions
if $enable_unsafe_memory; then
    append java_args --sun-misc-unsafe-memory-access=allow
fi

# Enable access to Unsafe memory functions

# ----- Tweak console environment for cygwin ----------------------------------

if $cygwin; then
    use_exec=false
    JRUBY_HOME="$(cygpath --mixed "$JRUBY_HOME")"
    JRUBY_SHELL="$(cygpath --mixed "$JRUBY_SHELL")"

    eval set -- "$ruby_args"

    case $1 in
        /*)
            if [ -f "$1" ] || [ -d "$1" ]; then
                # replace first element of ruby_args with cygwin form
                win_arg="$(cygpath -w "$1")"
                shift
                set -- "$win_arg" "$@"
                assign ruby_args "$@"
            fi
            ;;
    esac

    # fix JLine to use UnixTerminal
    if stty -icanon min 1 -echo > /dev/null 2>&1; then
        JAVA_OPTS="$JAVA_OPTS -Djline.terminal=jline.UnixTerminal"
    fi

fi

# ----- Final prepration of the Java command line -----------------------------

# Don't quote JAVA_OPTS; we want it to expand
# shellcheck disable=2086
prepend java_args $JAVA_OPTS "$JFFI_OPTS"

# Include all options from files at the beginning of the Java command line
preextend java_args java_opts_from_files

if $jdb; then
    preextend java_args jdb_args
fi

prepend java_args "$JAVACMD"

if $NO_BOOTCLASSPATH || $VERIFY_JRUBY; then
    if $use_modules; then
        # Use module path instead of classpath for the jruby libs
        append java_args --module-path "$JRUBY_CP" -classpath "$CLASSPATH"
    else
        append java_args -classpath "$JRUBY_CP$CP_DELIMITER$CLASSPATH"
    fi
else
    append java_args -Xbootclasspath/a:"$JRUBY_CP"
    append java_args -classpath "$CLASSPATH"
    append java_args -Djruby.home="$JRUBY_HOME"
fi

append java_args -Djruby.home="$JRUBY_HOME" \
    -Djruby.lib="$JRUBY_HOME/lib" \
    -Djruby.script=jruby \
    -Djruby.shell="$JRUBY_SHELL" \
    "$java_class"
extend java_args ruby_args

eval set -- "$java_args"

add_log
add_log "Java command line:"
add_log "  $*"

if $print_environment_log; then
    echo "$environment_log"
    exit 0
fi

# ----- Perform final mutations after logging ---------------------------------
# Delete All AppCDS files and exit if requested
if $remove_jsa_files; then
    eval rm -f -- "$jruby_jsa_files"
    exit
fi

if $regenerate_jsa_file && [ -e "$jruby_jsa_file" ]; then
    # Delete selected AppCDS file if requested or if it's outdated
    rm -f -- "$jruby_jsa_file"
fi

# ----- Run JRuby! ------------------------------------------------------------

if $use_exec; then
    exec "$@"
else
    "$@"

    # Record the exit status immediately, or it will be overridden.
    JRUBY_STATUS=$?

    if $cygwin; then
        stty icanon echo > /dev/null 2>&1
    fi

    exit $JRUBY_STATUS
fi