feat: scaffold baseos runtime

ts/cli.ts

@@ -0,0 +1,56 @@
+import { BaseRunner } from './classes.baserunner.ts';
+
+export async function runCli(argsArg: string[]) {
+  const command = argsArg[0] || 'start';
+  const runner = BaseRunner.fromEnv();
+
+  if (command === 'start') {
+    await runner.start();
+    await new Promise(() => undefined);
+    return;
+  }
+
+  if (command === 'status') {
+    await printJson(await runner.getRuntimeInfo());
+    return;
+  }
+
+  if (command === 'check-supervisor') {
+    await printJson({
+      configured: runner.supervisorClient.isConfigured(),
+      available: await runner.supervisorClient.isAvailable(),
+      address: runner.supervisorClient.address,
+    });
+    return;
+  }
+
+  if (command === 'request-update') {
+    await runner.requestSelfUpdate({ force: argsArg.includes('--force') });
+    await printJson({ ok: true });
+    return;
+  }
+
+  if (command === 'help' || command === '--help' || command === '-h') {
+    printHelp();
+    return;
+  }
+
+  console.error(`Unknown command: ${command}`);
+  printHelp();
+  Deno.exit(1);
+}
+
+async function printJson(dataArg: unknown) {
+  await Deno.stdout.write(new TextEncoder().encode(`${JSON.stringify(dataArg, null, 2)}\n`));
+}
+
+function printHelp() {
+  console.log(`BaseRunner commands:
+
+  start              Start BaseRunner and keep the process alive
+  status             Print runtime, supervisor, and Cloudly connection status
+  check-supervisor   Check whether the Balena Supervisor API is available
+  request-update     Ask the Balena Supervisor to check/apply app release updates
+  help               Show this help text
+`);
+}