Move config.json flag back to the database

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

src/config/index.ts

@@ -49,7 +49,6 @@ class Config extends EventEmitter {
 		supervisorOfflineMode: { source: 'config.json', default: false },
 		hostname: { source: 'config.json', mutable: true },
 		persistentLogging: { source: 'config.json', default: false, mutable: true },
-		localMode: { source: 'config.json', mutable: true, default: 'false' },
 
 		version: { source: 'func' },
 		currentApiKey: { source: 'func' },
@@ -82,6 +81,7 @@ class Config extends EventEmitter {
 		pinDevice: { source: 'db', mutable: true, default: 'null' },
 		currentCommit: { source: 'db', mutable: true },
 		targetStateSet: { source: 'db', mutable: true, default: 'false' },
+		localMode: { source: 'db', mutable: true, default: 'false' },
 	};
 
 	public constructor({ db, configPath }: ConfigOpts) {

src/migrations/M00002.js

@@ -0,0 +1,41 @@
+const fs = require('fs');
+const configJsonPath = process.env.CONFIG_MOUNT_POINT;
+
+const { checkTruthy } = require('../lib/validation');
+
+exports.up = function (knex, Promise) {
+	return new Promise(resolve => {
+		if (!configJsonPath) {
+			console.log('Unable to locate config.json! Things may fail unexpectedly!');
+			return resolve(false);
+		}
+
+		fs.readFile(configJsonPath, (err, data) => {
+			if (err) {
+				console.log('Failed to read config.json! Things may fail unexpectedly!');
+				return resolve();
+			}
+			try {
+				const parsed = JSON.parse(data.toString());
+				if (parsed.localMode != null) {
+					return resolve(checkTruthy(parsed.localMode));
+				}
+				return resolve(false);
+			} catch (e) {
+				console.log('Failed to parse config.json! Things may fail unexpectedly!');
+				return resolve(false);
+			}
+		});
+	}).then(localMode => {
+		// We can be sure that this does not already exist in the db because of the previous
+		// migration
+		return knex('config').insert({
+			key: 'localMode',
+			value: localMode.toString(),
+		});
+	});
+};
+
+exports.down = function (knex, Promise) {
+	return Promise.reject(new Error('Not Implemented'));
+};