0ct0pu5
/
webvm


			
				
					
						
						
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    <title>WebVM - Linux virtualization in WebAssembly</title>

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      <div style="flex-grow:1; height:100%;display:inline-block;margin:0;" class="scrollbar" id="console">
      </div>

    </main>
    <script>

	//Utility namespace to group all functionality related to printing (both error and non error) messages
	const color= "\x1b[1;35m";
	const bold= "\x1b[1;37m";
	const underline= "\x1b[94;4m";
	const normal= "\x1b[0m";
	var printOnTerm = {
		getAsciiText: function ()
		{
			var text = [
				"+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+",
				"|                                                                             |",
				"| WebVM is a server-less virtual Linux environment running fully client-side  |",
				"| in HTML5/WebAssembly.                                                       |",
				"|                                                                             |",
				"| WebVM is powered by the CheerpX virtualization engine, which enables safe,  |",
				"| sandboxed client-side execution of x86 binaries on any browser.             |",
				"|                                                                             |",
				"| CheerpX includes an x86-to-WebAssembly JIT compiler, a virtual block-based  |",
				"| file system, and a Linux syscall emulator.                                  |",
				"|                                                                             |",
				"| [NEW!] Your own WebVM with custom images via Dockerfile:                    |",
				"|                                                                             |",
				"| " + underline + "https://leaningtech.com/mini-webvm-your-linux-box-from-dockerfile-via-wasm" + normal +"  |",
				"|                                                                             |",
				"|                                                                             |",
				"| Join our Discord server for updates:                                        |",
				"|                                                                             |",
				"| " + underline + "https://discord.leaningtech.com" + normal + "                                             |",
				"|                                                                             |",
				"+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+",
				"",
				"   Welcome to WebVM. If unsure, try these examples:",
				"",
				"     python3 examples/python3/fibonacci.py ",
				"     gcc -o helloworld examples/c/helloworld.c && ./helloworld",
				"     objdump -d ./helloworld | less -M",
				"     vim examples/c/helloworld.c",
				"     curl --max-time 15 parrot.live  # requires networking",
				"",
				];
			return text;
		},
		getSharedArrayBufferMissingMessage: function ()
		{
			const isCustom = window.location.hostname !== "webvm.io";
			const isSecureContext = window.isSecureContext;
			const text = [
				"",
				"",
				color + "CheerpX could not start" + normal,
				"",
				"CheerpX uses SharedArrayBuffer, which is not available right now.",
				"",
				!isSecureContext && "  -  This page is not in a secure context. Serve over HTTPS or WSS.",
				!isSecureContext && "    " + underline + "https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts" + normal,
				isCustom && "  -  The document is not cross-origin isolated.",
				isCustom && "     " + underline + "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer#security_requirements" + normal, 
				"  - Your browser might not support SharedArrayBuffer.",
				"    Since 2022, all major browsers support this feature.",
				"    " + underline + "https://caniuse.com/sharedarraybuffer" + normal,
			].filter(Boolean);

			return text;
		},
		getErrorMessage: function (error_message)
		{
			const text = [
				"",
				"",
				color + "CheerpX could not start" + normal,
				"",
				"CheerpX internal error message is:",
				error_message,
				"",
				"",
				"CheerpX is expected to work with recent desktop versions of Chrome, Edge, Firefox and Safari",
				"",
				"",
				"Give it a try from a desktop version / another browser!",
				]

			return text;
		},
		printMessage: function (text) {
			for (var i=0; i<text.length; i++)
			{
				term.write(text[i]);
				term.write('\n');
			}
		},
		printError: function (message)
		{
			this.printMessage(message);

			term.write("\n\n");

			function writeCustom(something)
			{
				term.write(something);
			}
		},
	};

	var consoleDiv = document.getElementById("console");

	//xterm.js related logic
	var term = new Terminal({cursorBlink:true,convertEol:true, fontFamily:"monospace", fontWeight: 400, fontWeightBold: 700});
	var fitAddon = new FitAddon.FitAddon();
	term.loadAddon(fitAddon);
	var linkAddon = new WebLinksAddon.WebLinksAddon();
	term.loadAddon(linkAddon);
	term.open(consoleDiv);
	term.scrollToTop();

	fitAddon.fit();
	window.addEventListener("resize", function(ev){fitAddon.fit();}, false);
	term.focus();
	var cxReadFunc = null;
	function writeData(buf)
	{
		term.write(new Uint8Array(buf));
	}
	function readData(str)
	{
		if(cxReadFunc == null)
			return;
		for(var i=0;i<str.length;i++)
			cxReadFunc(str.charCodeAt(i));
	}
	term.onData(readData);

	function hddCallback(state)
	{
		var h = document.getElementById("hddactivity");
		if(state == "ready")
			h.textContent = "\u{1F7E2}";
		else
			h.textContent = "\u{1F7E0}";
	}
	function cpuCallback(state)
	{
		var h = document.getElementById("cpuactivity");
		if(state == "ready")
			h.textContent = "\u{1F7E2}";
		else
			h.textContent = "\u{1F7E0}";
	}

	//Actual CheerpX and bash specific logic
	async function runBash()
	{
		// cmd, cwd, args and env are replaced by the Github actions workflow.
		var cmd = CMD;
		var args = ARGS;
		var env = ENV;
		var cwd = CWD;
		var device_type = DEVICE_TYPE;
		var image_url = IMAGE_URL;
		// Reasonable defaults for local deployments
		// var cmd = "/bin/bash";
		// var args = ["--login"];
		// var env = ["HOME=/home/user", "TERM=xterm", "USER=user", "SHELL=/bin/bash", "EDITOR=vim", "LANG=en_US.UTF-8", "LC_ALL=C"];
		// var cwd = "/home/user";
		// var device_type = "bytes";
		// var image_url = "/your_local_image.ext2";
		const structure = {
			cmd: cmd,
			args: args,
			env: env,
			cwd: cwd
		}
		if (typeof SharedArrayBuffer === "undefined")
		{
			printOnTerm.printError(printOnTerm.getSharedArrayBufferMissingMessage());
			return;
		}

		let networkInterface = setupNetworkInterface();

		async function runTest(cx)
		{
			var processCount = 0;
			function handleProcessCreated()
			{
				processCount++;
				plausible(`Process started: ${processCount}`);
				if(processCount == 5)
				{
					// Make sure no further event is reported
					cx.unregisterCallback("processCreated", handleProcessCreated);
				}
			}
			cx.registerCallback("processCreated", handleProcessCreated);
			cx.registerCallback("cpuActivity", cpuCallback);
			cx.registerCallback("diskActivity", hddCallback);
			registerNetworkLogin(cx, networkInterface);

			term.scrollToBottom();

			async function cxLogAndRun(cheerpx, cmd, args, env)
			{
				await cheerpx.run(cmd, args, env);
				printOnTerm.printMessage(" ");
			}

			cxReadFunc = cx.setCustomConsole(writeData, term.cols, term.rows);

			function preventDefaults (e) {
				e.preventDefault()
				e.stopPropagation()
			}
			consoleDiv.addEventListener("dragover", preventDefaults, false);
			consoleDiv.addEventListener("dragenter", preventDefaults, false);
			consoleDiv.addEventListener("dragleave", preventDefaults, false);
			consoleDiv.addEventListener("drop", preventDefaults, false);

			var opts = {env:structure.env, cwd:structure.cwd, uid: 1000, gid: 1000};
			while (true)
			{
				await cxLogAndRun(cx, structure.cmd, structure.args, opts);
			}
		}
		function failCallback(err)
		{
			printOnTerm.printError(printOnTerm.getErrorMessage(err));
		}
		// The device url and type are replaced by Github Actions.
		var blockDevice;
		switch (device_type)
		{
			case "cloud":
				try
				{
					blockDevice = await CheerpX.CloudDevice.create(image_url);
				}
				catch(e)
				{
					// Report the failure and try again with plain HTTP
					var wssProtocol = "wss:";
					if(image_url.startsWith(wssProtocol))
					{
						// WebSocket protocol failed, try agin using plain HTTP
						plausible("WS Disk failure");
						image_url = "https:" + image_url.substr(wssProtocol.length);
						blockDevice = await CheerpX.CloudDevice.create(image_url);
					}
					else
					{
						// No other recovery option
						throw e;
					}
				}
				break;
			case "bytes":
				try
				{
					blockDevice = await CheerpX.HttpBytesDevice.create(image_url);
				}
				catch(e)
				{
					printOnTerm.printError([e]);
					throw e;
				}
				break;
			case "github":
				blockDevice = await CheerpX.GitHubDevice.create(image_url);
				break;
			default:
				console.log("Unrecognized device type");
				return;
		}
		var overlayDevice = await CheerpX.OverlayDevice.create(blockDevice, await CheerpX.IDBDevice.create("block1"));
		var webDevice = await CheerpX.WebDevice.create("");
		var dataDevice = await CheerpX.DataDevice.create();
		CheerpX.Linux.create({mounts:[{type:"ext2",dev:overlayDevice,path:"/"},{type:"dir",dev:webDevice,path:"/app"},{type:"dir",dev:dataDevice,path:"/data"},{type:"devs",path:"/dev"},{type:"proc",path:"/proc"}], networkInterface: networkInterface}).then(runTest, failCallback);
	}
	function initialMessage()
	{
		printOnTerm.printMessage(printOnTerm.getAsciiText());
		console.log("Welcome. We appreciate curiosity, but be warned that keeping the DevTools open causes significant performance degradation and crashes.");
	}
	initialMessage();
	async function loadCX()
	{
		// Find the latest build
		var r = await fetch("https://cxrtnc.leaningtech.com/LATEST.txt");
		var url = await r.text();
		url = url.trim();
		var script = document.createElement('script');
		script.type = 'text/javascript';
		script.src = url;
		script.addEventListener("load", runBash, false);
		document.head.appendChild(script);
	}
	loadCX();
    </script>
  </body>
</html>