/*
* Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package org.graalvm.compiler.test;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.Formatter;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.graalvm.util.CollectionsUtil;
/**
* Utility methods for spawning a VM in a subprocess during unit tests.
*/
public final class SubprocessUtil {
private SubprocessUtil() {
}
/**
* Gets the command line for the current process.
*
* @return the command line arguments for the current process or {@code null} if they are not
* available
*/
public static List<String> getProcessCommandLine() {
String processArgsFile = System.getenv().get("MX_SUBPROCESS_COMMAND_FILE");
if (processArgsFile != null) {
try {
return Files.readAllLines(new File(processArgsFile).toPath());
} catch (IOException e) {
}
}
return null;
}
/**
* Pattern for a single shell command argument that does not need to quoted.
*/
private static final Pattern SAFE_SHELL_ARG = Pattern.compile("[A-Za-z0-9@%_\\-\\+=:,\\./]+");
/**
* Reliably quote a string as a single shell command argument.
*/
public static String quoteShellArg(String arg) {
if (arg.isEmpty()) {
return "\"\"";
}
Matcher m = SAFE_SHELL_ARG.matcher(arg);
if (m.matches()) {
return arg;
}
// See http://stackoverflow.com/a/1250279
return "'" + arg.replace("'", "'\"'\"'") + "'";
}
/**
* Formats an executed shell command followed by its output. The command is formatted such that
* it can be copy and pasted into a console for re-execution.
*
* @param command the list containing the program and its arguments
* @param outputLines the output of the command broken into lines
* @param header if non null, the returned string has a prefix of this value plus a newline
* @param trailer if non null, the returned string has a suffix of this value plus a newline
*/
public static String formatExecutedCommand(List<String> command, List<String> outputLines, String header, String trailer) {
Formatter msg = new Formatter();
if (header != null) {
msg.format("%s%n", header);
}
msg.format("%s%n", CollectionsUtil.mapAndJoin(command, e -> quoteShellArg(String.valueOf(e)), " "));
for (String line : outputLines) {
msg.format("%s%n", line);
}
if (trailer != null) {
msg.format("%s%n", trailer);
}
return msg.toString();
}
/**
* Returns a new copy {@code args} with debugger arguments removed.
*/
public static List<String> withoutDebuggerArguments(List<String> args) {
List<String> result = new ArrayList<>(args.size());
for (String arg : args) {
if (!(arg.equals("-Xdebug") || arg.startsWith("-Xrunjdwp:"))) {
result.add(arg);
}
}
return result;
}
/**
* Gets the command line used to start the current Java VM, including all VM arguments, but not
* including the main class or any Java arguments. This can be used to spawn an identical VM,
* but running different Java code.
*/
public static List<String> getVMCommandLine() {
List<String> args = getProcessCommandLine();
if (args == null) {
return null;
} else {
int index = findMainClassIndex(args);
return args.subList(0, index);
}
}
private static final boolean isJava8OrEarlier = System.getProperty("java.specification.version").compareTo("1.9") < 0;
private static boolean hasArg(String optionName) {
if (optionName.equals("-cp") || optionName.equals("-classpath")) {
return true;
}
if (!isJava8OrEarlier) {
if (optionName.equals("--version") ||
optionName.equals("--show-version") ||
optionName.equals("--dry-run") ||
optionName.equals("--disable-@files") ||
optionName.equals("--dry-run") ||
optionName.equals("--help") ||
optionName.equals("--help-extra")) {
return false;
}
if (optionName.startsWith("--")) {
return optionName.indexOf('=') == -1;
}
}
return false;
}
private static int findMainClassIndex(List<String> commandLine) {
int i = 1; // Skip the java executable
while (i < commandLine.size()) {
String s = commandLine.get(i);
if (s.charAt(0) != '-') {
return i;
} else if (hasArg(s)) {
i += 2;
} else {
i++;
}
}
throw new InternalError();
}
}