#!/bin/sh

#
# Copyright © 2015 the original authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
#

##############################################################################
#
#   ${applicationName} start up script for POSIX generated by Gradle.
#
#   Important for running:
#
#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
#       noncompliant, but you have some other compliant shell such as ksh or
#       bash, then to run this script, type that shell name before the whole
#       command line, like:
#
#           ksh ${applicationName}
#
#       Busybox and similar reduced shells will NOT work, because this script
#       requires all of these POSIX shell features:
#         * functions;
#         * expansions «\$var», «\${var}», «\${var:-default}», «\${var+SET}»,
#           «\${var#prefix}», «\${var%suffix}», and «\$( cmd )»;
#         * compound commands having a testable exit status, especially «case»;
#         * various built-in commands including «command», «set», and «ulimit».
#
#   Important for patching:
#
#   (2) This script targets any POSIX shell, so it avoids extensions provided
#       by Bash, Ksh, etc; in particular arrays are avoided.
#
#       The "traditional" practice of packing multiple parameters into a
#       space-separated string is a well documented source of bugs and security
#       problems, so this is (mostly) avoided, by progressively accumulating
#       options in "\$@", and eventually passing that to Java.
#
#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
#       and ${optsEnvironmentVar}) rely on word-splitting, this is performed explicitly;
#       see the in-line comments for details.
#
#       There are tweaks for specific operating systems such as AIX, CygWin,
#       Darwin, MinGW, and NonStop.
#
#   (3) This script is generated from the Groovy template
#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
#       within the Gradle project.
#<% /*
#       ... and if you're reading this, this IS the template just mentioned.
#
#       This template is processed by
#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/java/org/gradle/api/internal/plugins/UnixStartScriptGenerator.java
#
#       Gradle is a meta-build system used by the project that you're building
#       or installing. It's like autoconf but for projects that are written in
#       Java and related languages. It's also used to build parts of the Gradle
#       project itself.
#
#       The Groovy template language is run in two phases.
#
#        1. Any character following \ is passed unmodified through to the
#           next phase, while the \ is removed. Any other $ followed by
#           varName or {varName} is replaced by the value of that variable.
#
#        2. The result of the first phase is parsed and run in a similar
#           manner to JSP or MASON or PHP: anything within < % ... % > is a
#           code block, anything else is sent as output, subject to the
#           flow imposed by any code segments.
#
#        3. The "output" is a POSIX shell script, which has its own ideas about
#           escaping with backslashes, so to get «\» you need to write «\\\\»
#           and to get «$» you need to write «\\\$».
#
#       For more details about the Groovy Template Engine, see
#       https://docs.groovy-lang.org/next/html/documentation/ section §3.15
#       (Template Engines) for details.
#
#       (An example invocation of this template is from
#       https://github.com/gradle/gradle/blob/HEAD/subprojects/build-init/src/main/java/org/gradle/api/tasks/wrapper/Wrapper.java
#       within the Gradle project, which builds "gradlew".)
# */ %>
#       You can find Gradle at https://github.com/gradle/gradle/.
#
##############################################################################

# Attempt to set APP_HOME

# Resolve links: \$0 may be a link
app_path=\$0

# Need this for daisy-chained symlinks.
while
    APP_HOME=\${app_path%"\${app_path##*/}"}  # leaves a trailing /; empty if no leading path
    [ -h "\$app_path" ]
do
    ls=\$( ls -ld "\$app_path" )
    link=\${ls#*' -> '}
    case \$link in             #(
      /*)   app_path=\$link ;; #(
      *)    app_path=\$APP_HOME\$link ;;
    esac
done

# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=\${0##*/}
# Discard cd standard output in case \$CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=\$( cd -P "\${APP_HOME:-./}${appHomeRelativePath}" > /dev/null && printf '%s\\n' "\$PWD" ) || exit

# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum

warn () {
    echo "\$*"
} >&2

die () {
    echo
    echo "\$*"
    echo
    exit 1
} >&2

# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "\$( uname )" in                #(
  CYGWIN* )         cygwin=true  ;; #(
  Darwin* )         darwin=true  ;; #(
  MSYS* | MINGW* )  msys=true    ;; #(
  NONSTOP* )        nonstop=true ;;
esac

<% if ( classpath ) {%>\
CLASSPATH=$classpath
<% } %>\
<% if ( mainClassName.startsWith('--module ') ) { %>
MODULE_PATH=$modulePath
<% } %>

# Determine the Java command to use to start the JVM.
if [ -n "\$JAVA_HOME" ] ; then
    if [ -x "\$JAVA_HOME/jre/sh/java" ] ; then
        # IBM's JDK on AIX uses strange locations for the executables
        JAVACMD=\$JAVA_HOME/jre/sh/java
    else
        JAVACMD=\$JAVA_HOME/bin/java
    fi
    if [ ! -x "\$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: \$JAVA_HOME

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
else
    JAVACMD=java
    if ! command -v java >/dev/null 2>&1
    then
        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
fi

# Increase the maximum file descriptors if we can.
if ! "\$cygwin" && ! "\$darwin" && ! "\$nonstop" ; then
    case \$MAX_FD in #(
      max*)
        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
        # shellcheck disable=SC2039,SC3045
        MAX_FD=\$( ulimit -H -n ) ||
            warn "Could not query maximum file descriptor limit"
    esac
    case \$MAX_FD in  #(
      '' | soft) :;; #(
      *)
        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
        # shellcheck disable=SC2039,SC3045
        ulimit -n "\$MAX_FD" ||
            warn "Could not set maximum file descriptor limit to \$MAX_FD"
    esac
fi

# Collect all arguments for the java command, stacking in reverse order:
#   * args from the command line
#   * the main class name
#   * -classpath
#   * -D...appname settings
#   * --module-path (only if needed)
#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and ${optsEnvironmentVar} environment variables.

# For Cygwin or MSYS, switch paths to Windows format before running java
if "\$cygwin" || "\$msys" ; then
    APP_HOME=\$( cygpath --path --mixed "\$APP_HOME" )
<% if ( classpath ) {%>\
    CLASSPATH=\$( cygpath --path --mixed "\$CLASSPATH" )
<% } %>\
<% if ( mainClassName.startsWith('--module ') ) { %>    MODULE_PATH=\$( cygpath --path --mixed "\$MODULE_PATH" )<% } %>
    JAVACMD=\$( cygpath --unix "\$JAVACMD" )

    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    for arg do
        if
            case \$arg in                                #(
              -*)   false ;;                            # don't mess with options #(
              /?*)  t=\${arg#/} t=/\${t%%/*}              # looks like a POSIX filepath
                    [ -e "\$t" ] ;;                      #(
              *)    false ;;
            esac
        then
            arg=\$( cygpath --path --ignore --mixed "\$arg" )
        fi
        # Roll the args list around exactly as many times as the number of
        # args, so each arg winds up back in the position where it started, but
        # possibly modified.
        #
        # NB: a `for` loop captures its iteration list before it begins, so
        # changing the positional parameters here affects neither the number of
        # iterations, nor the values presented in `arg`.
        shift                   # remove old arg
        set -- "\$@" "\$arg"      # push replacement arg
    done
fi

<% /*
# The DEFAULT_JVM_OPTS variable is intentionally defined here to allow using cygwin-processed APP_HOME.
# So far the only way to inject APP_HOME reference into DEFAULT_JVM_OPTS is to post-process the start script; the declaration is a good anchor to do that.
*/ %>
# Add default JVM options here. You can also use JAVA_OPTS and ${optsEnvironmentVar} to pass JVM options to this script.
DEFAULT_JVM_OPTS=${defaultJvmOpts}

# Collect all arguments for the java command:
#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
#     and any embedded shellness will be escaped.
#   * For example: A user cannot expect \${Hostname} to be expanded, as it is an environment variable and will be
#     treated as '\${Hostname}' itself on the command line.

set -- \\
<% if ( appNameSystemProperty ) {
     %>        "-D${appNameSystemProperty}=\$APP_BASE_NAME" \\
<% } %>\
<% if ( classpath ) {%>\
        -classpath "\$CLASSPATH" \\
<% } %>\
<% if ( mainClassName.startsWith('--module ') ) {
     %>        --module-path "\$MODULE_PATH" \\
<% } %>        ${mainClassName ?: entryPointArgs} \\
        "\$@"

# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
    die "xargs is not available"
fi

# Use "xargs" to parse quoted args.
#
# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
#
# In Bash we could simply go:
#
#   readarray ARGS < <( xargs -n1 <<<"\$var" ) &&
#   set -- "\${ARGS[@]}" "\$@"
#
# but POSIX shell has neither arrays nor command substitution, so instead we
# post-process each arg (as a line of input to sed) to backslash-escape any
# character that might be a shell metacharacter, then use eval to reverse
# that process (while maintaining the separation between arguments), and wrap
# the whole thing up as a single "set" statement.
#
# This will of course break if any of these variables contains a newline or
# an unmatched quote.
#

eval "set -- \$(
        printf '%s\\n' "\$DEFAULT_JVM_OPTS \$JAVA_OPTS \$${optsEnvironmentVar}" |
        xargs -n1 |
        sed ' s~[^-[:alnum:]+,./:=@_]~\\\\&~g; ' |
        tr '\\n' ' '
    )" '"\$@"'

exec "\$JAVACMD" "\$@"
