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Support for a virtual sessions, custom command execution etc.

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package com.sshtools.server.vsession.commands.fs;

/*-
 * #%L
 * Virtual Sessions
 * %%
 * Copyright (C) 2002 - 2024 JADAPTIVE Limited
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

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

import com.sshtools.server.vsession.CliHelper;
import com.sshtools.server.vsession.ShellCommand;
import com.sshtools.server.vsession.UsageHelper;
import com.sshtools.server.vsession.VirtualConsole;

public class Disks extends ShellCommand {
	public Disks() {
		super("disks", SUBSYSTEM_FILESYSTEM, UsageHelper.build("disks [options] ", 
				"-m               Display size in megabytes",
				"-k               Display size in kilobytes",
				"-g               Display size in gigabytes",
				"-b               Display size in bytes"),
				"List local root file systems or displays information about local disk drives");

	}

	public void run(String[] args, VirtualConsole process) throws IOException {

		if (args.length == 1) {
			for (File file : File.listRoots()) {
				process.println(file.getAbsolutePath());
			}
		} else {
			for (int i = 1; i < args.length; i++) {
				File f = new File(args[i]);
				process.println(f.getAbsolutePath());
				process.println("    Total: " + format(args, f.getTotalSpace()));
				process.println("    Usable: " + format(args, f.getUsableSpace()));
				process.println("    Free: " + format(args, f.getFreeSpace()));
			}
		}

	}

	static String format(String[] args, long value) {
		if (CliHelper.hasShortOption(args, 'm')) {
			return (value / 1024 / 1024) + " MB";
		} else if (CliHelper.hasShortOption(args, 'k')) {
			return (value / 1024) + " KB";
		} else if (CliHelper.hasShortOption(args, 'b')) {
			return value + " Bytes";
		} else {
			return (value / 1024 / 1024 / 1024) + " GB";
		}
	}
}