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< title > WebVM - Linux virtualization in WebAssembly< / title >
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< meta name = "description" content = "Server-less virtual machine, networking included, running browser-side in HTML5/WebAssembly. Code in any programming language inside this Linux terminal." >
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< meta name = "keywords" content = "WebVM, Virtual Machine, CheerpX, x86 virtualization, WebAssembly, Tailscale, JIT" >
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< meta property = "og:title" content = "WebVM - Linux virtualization in WebAssembly" / >
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< meta name = "twitter:title" content = "WebVM - Linux virtualization in WebAssembly" / >
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< meta name = "twitter:description" content = "Server-less virtual machine, networking included, running browser-side in HTML5/WebAssembly. Code in any programming language inside this Linux terminal." >
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< style > . github-fork-ribbon : before { background-color : #ea1e69 ; } < / style >
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< script src = "./xterm/xterm-addon-fit.js" > < / script >
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< script src = "./xterm/xterm-addon-web-links.js" > < / script >
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< script src = "network.js" > < / script >
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< script defer data-domain = "webvm.io" src = "https://plausible.leaningtech.com/js/script.js" > < / script >
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< / head >
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< body style = "margin:0;height:100%;background:black;color:white;overflow:hidden; display:flex; flex-direction: column; justify-content: space-between; height: 100%;" >
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< a class = "github-fork-ribbon right-bottom" href = "https://github.com/leaningtech/webvm/" target = "_blank" data-ribbon = "Fork me on GitHub" title = "Fork me on GitHub" > Fork me on GitHub< / a >
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< div >
< div style = "padding-top: 0.7em;padding-bottom: 0.7em;font-size: 0.3em; font-weight: 200;vertical-align:center;height: 120px;" >
< div style = "margin-left: 20px; height: 100%; display: flex; align-items: center; justify-content: space-between;" >
< pre style = "font-family: monospace; font-weight: 600; font-size: large; color: #ad7fa8;" >
__ __ _ __ ____ __
\ \ / /__| |_\ \ / / \/ |
\ \/\/ / -_) '_ \ V /| |\/| |
\_/\_/\___|_.__/\_/ |_| |_|
< / pre >
< div style = "height:100%;display: flex; flex-direction: column;justify-content: space-between;" >
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< div style = "margin-right: 10px; margin-left: 20px; height: 100%; display: flex; align-items: center; justify-content: flex-end;gap: 50px;" >
< div style = "padding-top: 0.7em;font-size: 0.3em; font-weight: 200;vertical-align:center;" >
< a href = "https://leaningtech.com" style = "text-decoration: none; height: 100%;" target = "_blank" >
< div style = "color: white; font-family: montserrat; font-weight: 400; font-size: large; height: 100%; display: flex; align-items: center;" >
< span > Made with ❤ ️ by < / span >
< img src = "assets/leaningtech.png" height = "40px" style = "margin-left: 5px;" >
< / div >
< / a >
< / div >
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< / div >
< div style = "padding-top: 0.7em;font-size: 0.3em; font-weight: 200;vertical-align:center;height:50px;" >
< div style = "margin-right: 10px; margin-left: 20px; height: 100%; display: flex; align-items: center; justify-content: flex-end;gap: 50px;" >
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< div style = "color: white; font-family: montserrat; font-weight: 400; font-size: large; height: 100%; display: flex; align-items: center;" >
< span > CPU < / span >
< span id = "cpuactivity" style = "margin-left: 7px;" > 🟢 < / span >
< / div >
< div style = "color: white; font-family: montserrat; font-weight: 400; font-size: large; height: 100%; display: flex; align-items: center;" >
< span > HDD < / span >
< span id = "hddactivity" style = "margin-left: 7px;" > 🟢 < / span >
< / div >
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< a id = "loginLink" style = "user-select: text ;text-decoration: none; height: 100%;" >
< div style = "color: white; font-family: montserrat; font-weight: 400; font-size: large; height: 100%; display: flex; align-items: center;" >
< div style = "position: relative;" >
< span style = "cursor: pointer" id = "networkStatus" > Connect via Tailscale < / span >
< span style = "cursor: pointer; position: absolute; right: 0px; visibility: hidden;" id = "ipCopied" > Copied! < / span >
< / div >
< img src = "assets/tailscale.svg" height = "35px" style = "margin-left: 7px;" >
< / div >
< / a >
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< span > Join Discord < / span >
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< img src = "assets/discord-mark-blue.svg" height = "35px" style = "margin-left: 7px;" >
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< / div >
< / a >
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< div style = "flex-grow:1; height:100%;display:inline-block;margin:0;" class = "scrollbar" id = "console" >
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< / 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 = [
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"+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+",
"| |",
"| 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 |",
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"| file system, and a Linux syscall emulator. |",
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"| |",
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"| [NEW!] Your own WebVM with custom images via Dockerfile: |",
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"| |",
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"| " + underline + "https://leaningtech.com/mini-webvm-your-linux-box-from-dockerfile-via-wasm" + normal +" |",
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"| |",
"+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+",
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"",
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" Welcome to WebVM. If unsure, try these examples:",
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"",
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" python3 examples/python3/fibonacci.py ",
" gcc -o helloworld examples/c/helloworld.c & & ./helloworld",
" objdump -d ./helloworld | less -M",
" vim examples/c/helloworld.c",
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" curl --max-time 15 parrot.live # requires networking",
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"",
];
return text;
},
getSharedArrayBufferMissingMessage: function ()
{
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const isCustom = window.location.hostname !== "webvm.io";
const isSecureContext = window.isSecureContext;
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const text = [
"",
"",
color + "CheerpX could not start" + normal,
"",
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"CheerpX uses SharedArrayBuffer, which is not available right now.",
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"",
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!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" + noral,
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);
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return text;
},
getErrorMessage: function (error_message)
{
const text = [
"",
"",
color + "CheerpX could not start" + normal,
"",
"CheerpX internal error message is:",
error_message,
"",
"",
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"CheerpX is expected to work with recent desktop versions of Chrome, Edge, Firefox and Safari",
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"",
"",
"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
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var term = new Terminal({cursorBlink:true,convertEol:true, fontFamily:"monospace", fontWeight: 400, fontWeightBold: 700});
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var fitAddon = new FitAddon.FitAddon();
term.loadAddon(fitAddon);
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var linkAddon = new WebLinksAddon.WebLinksAddon();
term.loadAddon(linkAddon);
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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);
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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}";
}
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//Actual CheerpX and bash specific logic
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function runBash()
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{
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// cmd, cwd, args and env are replaced by the Github actions workflow.
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var cmd = CMD;
var args = ARGS;
var env = ENV;
var cwd = CWD;
// Reasonable defaults for local deployments
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// 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";
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const structure = {
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cmd: cmd,
args: args,
env: env,
cwd: cwd
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}
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if (typeof SharedArrayBuffer === "undefined")
{
printOnTerm.printError(printOnTerm.getSharedArrayBufferMissingMessage());
return;
}
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let networkInterface = setupNetworkInterface();
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async function runTest(cx)
{
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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);
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cx.registerCallback("cpuActivity", cpuCallback);
cx.registerCallback("diskActivity", hddCallback);
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registerNetworkLogin(cx, networkInterface);
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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);
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var opts = {env:structure.env, cwd:structure.cwd, uid: 1000, gid: 1000};
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while (true)
{
await cxLogAndRun(cx, structure.cmd, structure.args, opts);
}
}
function failCallback(err)
{
printOnTerm.printError(printOnTerm.getErrorMessage(err));
}
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// The device url and type are replaced by Github Actions.
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CheerpXApp.create({devices:[{type:DEVICE_TYPE,url:IMAGE_URL,name:"block1"}],mounts:[{type:"ext2",dev:"block1",path:"/"},{type:"cheerpOS",dev:"/app",path:"/app"},{type:"cheerpOS",dev:"/str",path:"/data"},{type:"devs",dev:"",path:"/dev"}], networkInterface: networkInterface}).then(runTest, failCallback);
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}
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();
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async function loadCX()
{
// Find the latest build
var r = await fetch("https://cheerpxdemos.leaningtech.com/publicdeploy/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();
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< / script >
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<!-- Google tag (gtag.js) -->
< script defer src = "https://www.googletagmanager.com/gtag/js?id=G-818T3Y0PEY" > < / script >
< script defer >
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-818T3Y0PEY');
< / script >
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< / body >
< / html >
