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package moe.nea.modernjava.launch.relaunch;
import moe.nea.modernjava.launch.util.PropertyNames;
import moe.nea.modernjava.launch.util.TextIoUtils;
import moe.nea.modernjava.launch.util.WellKnownBlackboard;
import net.minecraftforge.fml.common.launcher.FMLTweaker;
import net.minecraftforge.fml.nea.moe.modernjava.IAMFML;
import org.apache.commons.io.IOUtils;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.management.ManagementFactory;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class FCPRelauncher {
/**
* @return the original arguments, as passed to the main method.
*/
public static List<String> getOriginalArguments() {
List<String> originalArgs = new ArrayList<>();
// Provided by FML
// This is highly processed so there might be some arguments that become lost, but almost everything should be in here.
// Namely non -- arguments get lost. I don't know any of these arguments that the vanilla launcher uses, so it should be fine?
// Also, some tweakers are missing. But we can fix this.
Map<String, String> launchArgs = WellKnownBlackboard.launchArgs();
if ("UnknownFMLProfile".equals(launchArgs.get("--version"))) {
launchArgs.remove("--version");
}
for (Map.Entry<String, String> argument : launchArgs.entrySet()) {
originalArgs.add(argument.getKey());
originalArgs.add(argument.getValue());
}
originalArgs.add("--tweakClass");
originalArgs.add(FMLTweaker.class.getName());
System.out.println("Reconstructed original minecraft arguments: " + originalArgs);
return originalArgs;
}
public static File findJavaLauncher() {
JavaScanner javaScanner = new JavaScanner();
javaScanner.scanDefaultPaths();
javaScanner.prettyPrint();
JavaScanner.LocalJavaVersion candidate = javaScanner.findCandidate();
if (candidate == null) {
System.err.println("Looks like we couldn't find a java candidate. Either install one, or if you have one" +
" and we just cannot find it, specify -D" + PropertyNames.JAVA_SCAN_PATH + "=<java home here>." +
" We need a Java 16 JDK. Exiting now.");
IAMFML.shutdown(1);
throw new RuntimeException();
}
System.out.println("Choosing Java Candidate:\n" + candidate.prettyPrint());
return candidate.getJavaBinary();
}
public static File findAgentJar() {
try {
File file = File.createTempFile("mjr-agent", ".jar");
try (InputStream is = FCPRelauncher.class.getResourceAsStream("/agent/agent.jar");
OutputStream os = Files.newOutputStream(file.toPath())) {
assert is != null;
IOUtils.copy(is, os);
}
return file;
} catch (IOException e) {
throw new RuntimeException(e);
}
}
public static void relaunch() {
List<String> originalArgs = getOriginalArguments();
File modernJavaPath = findJavaLauncher();
System.out.println("Located modern minecraft at: " + modernJavaPath);
File agentFile = findAgentJar();
System.out.println("Located agent jar at: " + agentFile);
ProcessBuilder processBuilder = new ProcessBuilder();
processBuilder.inheritIO();
processBuilder.directory(null);
List<String> moduleOpens = new ArrayList<>();
moduleOpens.add("java.base/java.util=ALL-UNNAMED");
moduleOpens.add("java.base/jdk.internal.loader=ALL-UNNAMED");
moduleOpens.add("java.base/java.lang.reflect=ALL-UNNAMED");
List<String> fullCommandLine = new ArrayList<>();
fullCommandLine.add(modernJavaPath.getAbsolutePath());
fullCommandLine.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments());
fullCommandLine.add("-D" + PropertyNames.HAS_RELAUNCHED + "=true");
fullCommandLine.add("-D" + PropertyNames.RELAUNCH_CLASSPATH + "=" + agentFile.getAbsolutePath() + File.pathSeparator + ManagementFactory.getRuntimeMXBean().getClassPath());
fullCommandLine.add("--illegal-access=permit");
for (String open : moduleOpens) {
fullCommandLine.add("--add-opens");
fullCommandLine.add(open);
}
if (System.getProperty(PropertyNames.DEBUG_PORT) != null)
fullCommandLine.add("-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:" + System.getProperty(PropertyNames.DEBUG_PORT));
fullCommandLine.add("-javaagent:" + agentFile.getAbsolutePath());
fullCommandLine.add("--add-modules=ALL-MODULE-PATH,ALL-SYSTEM,ALL-DEFAULT,java.sql");
fullCommandLine.add("-Xbootclasspath/a:" + agentFile.getAbsolutePath());
fullCommandLine.add("moe.nea.modernjava.agent.RelaunchEntryPoint");
fullCommandLine.addAll(originalArgs);
System.out.println("Full relaunch commandline: " + fullCommandLine);
processBuilder.command(fullCommandLine);
int exitCode;
try {
try {
Process process = processBuilder.start();
exitCode = process.waitFor();
} finally {
TextIoUtils.flushStdIO();
}
} catch (IOException | InterruptedException e) {
throw new RuntimeException("Failed to relaunch with old java version", e);
}
System.out.println("Exiting outer relaunch layer");
IAMFML.shutdown(exitCode);
}
}
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