Add livepush capabilities for debug builds

Change-type: minor
Signed-off-by: Cameron Diver <cameron@balena.io>

sync-debug.js

@@ -0,0 +1,95 @@
+#!/usr/bin/env node
+
+if (!process.argv[2] || ['help', '-h', '--help'].includes(process.argv[2])) {
+	console.log(`
+Sync changes in the javascript code to a running local mode supervisor on a device on the local network
+
+Usage:
+  ./sync-debug.js <device IP>
+
+Note that the device should be running a debug image.
+	`);
+	process.exit(1);
+}
+
+const ip = process.argv[2];
+
+const { Livepush } = require('livepush');
+const { fs } = require('mz');
+const dockerode = require('dockerode');
+const chokidar = require('chokidar');
+const _ = require('lodash');
+
+const docker = new dockerode({
+	host: ip,
+	port: 2375,
+});
+
+function extractMessage(msgBuf) {
+	// Non-tty message format from:
+	// https://docs.docker.com/engine/api/v1.30/#operation/ContainerAttach
+	if (
+		_.includes([0, 1, 2], msgBuf[0]) &&
+		_.every(msgBuf.slice(1, 7), c => c === 0)
+	) {
+		// Take the header from this message, and parse it as normal
+		msgBuf = msgBuf.slice(8);
+	}
+	const logLine = msgBuf.toString();
+	const space = logLine.indexOf(' ');
+	if (space > 0) {
+		let timestamp = new Date(logLine.substr(0, space)).getTime();
+		if (_.isNaN(timestamp)) {
+			timestamp = Date.now();
+		}
+		return {
+			timestamp,
+			message: logLine.substr(space + 1),
+		};
+	}
+	return;
+}
+
+(async () => {
+	// Get the supervisor container id
+	const container = await docker.getContainer('resin_supervisor').inspect();
+	const containerId = container.Id;
+	const image = container.Image;
+
+	const livepush = await Livepush.init(
+		await fs.readFile('Dockerfile.debug'),
+		'.',
+		containerId,
+		// a bit of a hack, as the multistage images aren't
+		// present, but it shouldn't make a difference as these
+		// will never change
+		_.times(7, () => image),
+		docker,
+	);
+
+	// TODO: Debounce these calls
+	chokidar
+		.watch('.', {
+			ignored: /((^|[\/\\])\..|node_modules.*)/,
+			ignoreInitial: true,
+		})
+		.on('add', path => {
+			livepush.performLivepush([path], []);
+		})
+		.on('change', path => {
+			livepush.performLivepush([path], []);
+		})
+		.on('unlink', path => {
+			livepush.performLivepush([], [path]);
+		});
+
+	livepush.on('commandExecute', ({ command }) => {
+		console.log('SYNC: executing:', command);
+	});
+	livepush.on('commandOutput', ({ output }) => {
+		console.log(`\t${output.data.toString()}`);
+	});
+	livepush.on('containerRestart', () => {
+		console.log('SYNC: Restarting container...');
+	});
+})();