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/*
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.test;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.nio.file.Files;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Formatter;
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import java.util.List;
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import java.util.Map;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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import org.graalvm.compiler.serviceprovider.JavaVersionUtil;
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import org.graalvm.util.CollectionsUtil;
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import org.junit.Assume;
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/**
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* Utility methods for spawning a VM in a subprocess during unit tests.
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*/
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public final class SubprocessUtil {
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private SubprocessUtil() {
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}
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/**
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* Gets the command line for the current process.
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*
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* @return the command line arguments for the current process or {@code null} if they are not
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* available
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*/
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public static List<String> getProcessCommandLine() {
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String processArgsFile = System.getenv().get("MX_SUBPROCESS_COMMAND_FILE");
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if (processArgsFile != null) {
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try {
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return Files.readAllLines(new File(processArgsFile).toPath());
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} catch (IOException e) {
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}
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} else {
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Assume.assumeTrue("Process command line unavailable", false);
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}
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return null;
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}
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/**
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* Pattern for a single shell command argument that does not need to quoted.
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*/
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private static final Pattern SAFE_SHELL_ARG = Pattern.compile("[A-Za-z0-9@%_\\-\\+=:,\\./]+");
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/**
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* Reliably quote a string as a single shell command argument.
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*/
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public static String quoteShellArg(String arg) {
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if (arg.isEmpty()) {
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return "\"\"";
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}
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Matcher m = SAFE_SHELL_ARG.matcher(arg);
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if (m.matches()) {
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return arg;
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}
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// See http://stackoverflow.com/a/1250279
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return "'" + arg.replace("'", "'\"'\"'") + "'";
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}
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/**
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* Returns a new copy {@code args} with debugger arguments removed.
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*/
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public static List<String> withoutDebuggerArguments(List<String> args) {
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List<String> result = new ArrayList<>(args.size());
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for (String arg : args) {
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if (!(arg.equals("-Xdebug") || arg.startsWith("-Xrunjdwp:"))) {
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result.add(arg);
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}
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}
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return result;
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}
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/**
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* Gets the command line used to start the current Java VM, including all VM arguments, but not
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* including the main class or any Java arguments. This can be used to spawn an identical VM,
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* but running different Java code.
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*/
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public static List<String> getVMCommandLine() {
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List<String> args = getProcessCommandLine();
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if (args == null) {
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return null;
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} else {
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int index = findMainClassIndex(args);
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return args.subList(0, index);
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}
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}
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/**
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* Detects whether a java agent is attached.
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*/
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public static boolean isJavaAgentAttached() {
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return SubprocessUtil.getVMCommandLine().stream().anyMatch(args -> args.startsWith("-javaagent"));
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}
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/**
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* The details of a subprocess execution.
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*/
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public static class Subprocess {
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/**
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* The command line of the subprocess.
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*/
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public final List<String> command;
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/**
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* Exit code of the subprocess.
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*/
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public final int exitCode;
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/**
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* Output from the subprocess broken into lines.
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*/
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public final List<String> output;
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public Subprocess(List<String> command, int exitCode, List<String> output) {
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this.command = command;
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this.exitCode = exitCode;
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this.output = output;
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}
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public static final String DASHES_DELIMITER = "-------------------------------------------------------";
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/**
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* Returns the command followed by the output as a string.
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*
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* @param delimiter if non-null, the returned string has this value as a prefix and suffix
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*/
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public String toString(String delimiter) {
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Formatter msg = new Formatter();
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if (delimiter != null) {
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msg.format("%s%n", delimiter);
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}
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msg.format("%s%n", CollectionsUtil.mapAndJoin(command, e -> quoteShellArg(String.valueOf(e)), " "));
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for (String line : output) {
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msg.format("%s%n", line);
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}
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if (delimiter != null) {
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msg.format("%s%n", delimiter);
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}
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return msg.toString();
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}
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/**
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* Returns the command followed by the output as a string delimited by
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* {@value #DASHES_DELIMITER}.
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*/
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@Override
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public String toString() {
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return toString(DASHES_DELIMITER);
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}
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}
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/**
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* Executes a Java subprocess.
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*
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* @param vmArgs the VM arguments
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* @param mainClassAndArgs the main class and its arguments
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*/
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public static Subprocess java(List<String> vmArgs, String... mainClassAndArgs) throws IOException, InterruptedException {
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return java(vmArgs, Arrays.asList(mainClassAndArgs));
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}
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/**
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* Executes a Java subprocess.
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*
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* @param vmArgs the VM arguments
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* @param mainClassAndArgs the main class and its arguments
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*/
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public static Subprocess java(List<String> vmArgs, List<String> mainClassAndArgs) throws IOException, InterruptedException {
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return javaHelper(vmArgs, null, mainClassAndArgs);
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}
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/**
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* Executes a Java subprocess.
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*
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* @param vmArgs the VM arguments
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* @param env the environment variables
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* @param mainClassAndArgs the main class and its arguments
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*/
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public static Subprocess java(List<String> vmArgs, Map<String, String> env, String... mainClassAndArgs) throws IOException, InterruptedException {
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return java(vmArgs, env, Arrays.asList(mainClassAndArgs));
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}
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/**
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* Executes a Java subprocess.
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*
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* @param vmArgs the VM arguments
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* @param env the environment variables
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* @param mainClassAndArgs the main class and its arguments
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*/
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public static Subprocess java(List<String> vmArgs, Map<String, String> env, List<String> mainClassAndArgs) throws IOException, InterruptedException {
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return javaHelper(vmArgs, env, mainClassAndArgs);
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}
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/**
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* Executes a Java subprocess.
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*
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* @param vmArgs the VM arguments
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* @param env the environment variables
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* @param mainClassAndArgs the main class and its arguments
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*/
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private static Subprocess javaHelper(List<String> vmArgs, Map<String, String> env, List<String> mainClassAndArgs) throws IOException, InterruptedException {
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List<String> command = new ArrayList<>(vmArgs);
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command.addAll(mainClassAndArgs);
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ProcessBuilder processBuilder = new ProcessBuilder(command);
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if (env != null) {
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Map<String, String> processBuilderEnv = processBuilder.environment();
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processBuilderEnv.putAll(env);
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}
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processBuilder.redirectErrorStream(true);
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Process process = processBuilder.start();
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BufferedReader stdout = new BufferedReader(new InputStreamReader(process.getInputStream()));
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String line;
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List<String> output = new ArrayList<>();
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while ((line = stdout.readLine()) != null) {
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output.add(line);
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}
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return new Subprocess(command, process.waitFor(), output);
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}
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private static final boolean isJava8OrEarlier = JavaVersionUtil.JAVA_SPEC <= 8;
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private static boolean hasArg(String optionName) {
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if (optionName.equals("-cp") || optionName.equals("-classpath")) {
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return true;
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}
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if (!isJava8OrEarlier) {
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if (optionName.equals("--version") ||
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optionName.equals("--show-version") ||
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optionName.equals("--dry-run") ||
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optionName.equals("--disable-@files") ||
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optionName.equals("--dry-run") ||
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optionName.equals("--help") ||
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optionName.equals("--help-extra")) {
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return false;
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}
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if (optionName.startsWith("--")) {
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return optionName.indexOf('=') == -1;
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}
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}
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return false;
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}
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private static int findMainClassIndex(List<String> commandLine) {
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int i = 1; // Skip the java executable
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while (i < commandLine.size()) {
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String s = commandLine.get(i);
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if (s.charAt(0) != '-') {
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return i;
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} else if (hasArg(s)) {
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i += 2;
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} else {
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i++;
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}
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}
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throw new InternalError();
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}
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}
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