Launch a TigerVNC server running a virtual desktop if the container has noVNC installed

Ideally this would permit developing GUI applications, but currently only the xeyes program works.
When launching the X server, we use -nolisten local to allow it to coexist with any existing one(s).

Author: solb

main.ts

@@ -17,12 +17,17 @@ const SHUTDOWN_TIMEOUT_S = 90;
 
 const emailToToken: {[_: string]: string} = {};
 const tokenToEditor: {[_: string]: Editor} = {};
+const nextDisplay = [1];
 
 type Editor = {
-	port: number,
 	process: Deno.Process,
+	port: number,
+
+	display: number,
+
 	refCount: number,
 	shutdownHandle?: number,
+
 	queryString?: string,
 };
 
@@ -94,6 +99,10 @@ async function handler(request: Request): Promise<Response> {
 				+ tokenToEditor[vsCodeToken].port
 		);
 	else {
+		let display = nextDisplay.pop()!;
+		if(!nextDisplay.length)
+			nextDisplay.push(display + 1);
+
 		const process = Deno.run({
 			cmd: ["chroot/jail", "vscode", "-c", "openvscode-drive", "--port", "0"],
 			stdin: "piped",
@@ -103,11 +112,13 @@ async function handler(request: Request): Promise<Response> {
 		process.stdin.write(stdin.encode(tokens.access_token + "\n"));
 		process.stdin.write(stdin.encode(tokens.refresh_token + "\n"));
 		process.stdin.write(stdin.encode(expiry.toISOString() + "\n"));
+		process.stdin.write(stdin.encode(display + "\n"));
 
 		const {port, token} = await parsePortAndToken(process.stdout);
 		tokenToEditor[token] = {
-			port,
 			process,
+			port,
+			display,
 			refCount: 0,
 		};
 		emailToToken[email] = token;
@@ -140,6 +151,7 @@ function proxy(request: Request, token: string): Promise<Response> {
 		delete tokenToEditor[token];
 		editor.process.kill("SIGHUP");
 		await editor.process.status();
+		nextDisplay.push(editor.display);
 	};
 	const decrRefCount = function() {
 		--editor.refCount;

plugins/openvscode-drive

@@ -1,8 +1,12 @@
 #!/bin/sh
 
+readonly X11_PORT="5900"
+readonly VNC_PORT="6080"
+
 read access_token
 read refresh_token
 read expiry
+read display
 cd
 
 cat <<-tac >.rclone.conf
@@ -22,4 +26,12 @@ do
 done
 cd
 
+if which novnc_proxy >/dev/null
+then
+	Xvnc -SecurityTypes None -localhost -nolisten local ":$display" &
+	novnc_proxy --vnc ":$((X11_PORT + display))" --listen $((VNC_PORT + display)) &
+
+	export DISPLAY=":$display"
+fi
+
 exec unshare -U openvscode-server "$@"