HackyLs.java

// Discovering the path of JVM (if the server's `java` executable isn't the right version)

import java.io.File;

public class HackyLs {
	public static void main(String[] args) {
		// Input the directory you want to list here
		String jvmDirectoryPath = "/opt/";
		File jvmDir = new File(jvmDirectoryPath);

		System.out.println("Attempting to list contents of: " + jvmDirectoryPath);

		if (!jvmDir.exists()) {
			System.err.println("Error: The directory does not exist: " + jvmDirectoryPath);
			System.exit(1);
		}

		if (!jvmDir.isDirectory()) {
			System.err.println("Error: The path is not a directory: " + jvmDirectoryPath);
			System.exit(1);
		}

		File[] files = jvmDir.listFiles();

		if (files == null) {
			// This can happen due to file permission issues
			System.err.println("Error: Failed to read directory contents. (Check permissions?)");
			System.exit(1);
		}

		if (files.length == 0) {
			System.out.println("The directory is empty: " + jvmDirectoryPath);
		} else {
			System.out.println("Found the following items:");
			for (File file : files) {
				// Print the name, adding a / if it's a directory to make it clearer
				System.out.println(file.getName() + (file.isDirectory() ? "/" : ""));
			}
		}
	}
}

RunRestore.java

// Running the AdvancedBackups mod from the right directory and handing over user input to it.

import java.io.File;
import java.io.IOException;

public class RunRestore {
	public static void main(String[] args) {
		String targetDirectoryPath = "./mods/";
		String targetJarName = "AdvancedBackups-fabric-1.20-3.7.1.jar";
		String javaPath = "/opt/jdk-17.0.1/bin/java";

		// --- 2. Directory Validation ---
		File workingDir = new File(targetDirectoryPath);
		if (!workingDir.exists() || !workingDir.isDirectory()) {
			System.err.println("Error: The specified directory does not exist or is not a directory:");
			System.err.println(targetDirectoryPath);
			System.exit(1);
		}

		System.out.println("Attempting to run '" + targetJarName + "' from directory '" + targetDirectoryPath + "'...");

		ProcessBuilder pb = new ProcessBuilder(javaPath, "-jar", targetJarName);

		pb.directory(workingDir);

		try {
			pb.inheritIO();

			Process process = pb.start();

			int exitCode = process.waitFor();

			System.out.println("Target program finished with exit code: " + exitCode);

		} catch (IOException e) {
			// This can happen if 'java' isn't a valid command or the .jar isn't found
			System.err.println("Error starting the process: " + e.getMessage());
			e.printStackTrace();
		} catch (InterruptedException e) {
			// This can happen if the waiting thread is interrupted
			System.err.println("Process was interrupted: " + e.getMessage());
			Thread.currentThread().interrupt(); // Restore the interrupted status
		}
	}
}