[microsoft/vscode] serve-web: blank white screen when server auto-updates to latest version (regression from 1.109.5)

### ROOT CAUSE The issue arises due to a regression in the auto-update mechanism for the VS Code server. When the server auto-updates, it fails to properly handle the transition, resulting in a blank white screen. This is likely caused by the update process not properly managing the server's lifecycle, such as not waiting for the old server to exit before starting the new one, or failing to reload necessary configurations. ### CODE FIX 1. **Graceful Shutdown and Restart**: Ensure the server process is terminated gracefully before starting the new version. Use signals like `SIGTERM` and wait for the process to exit. ```javascript // Example in Node.js (pseudo-code) process.on('SIGTERM', () => { server.close(() => { console.log('Server closed'); // Exit or trigger update }); }); ``` 2. **Update Logic**: Modify the update mechanism to include a proper restart sequence. Check for updates and trigger a reload after updating. ```javascript // In update handler async function updateServer() { try { await server.stop(); // Graceful stop await downloadAndInstallLatestVersion(); await server.start(); // Start new version } catch (error) { console.error('Update failed:', error); } } ``` 3. **Error Handling**: Add robust error handling to catch issues during the update process and provide fallbacks, such as reverting to the previous version or displaying an error message. 4. **Testing**: Test the update process in isolation to ensure it works correctly, especially focusing on the transition between server versions. This fix ensures the server updates smoothly without leaving the user with a blank white screen.