Fixed install error due to runtime path not writable

index.php

@@ -175,7 +175,22 @@
 require_once BASEPATH . 'yii' . EXT;
 require_once APPPATH . 'core/LSYii_Application' . EXT;
 
-Yii::createApplication('LSYii_Application', APPPATH . 'config/config' . EXT)->run();
+$config = APPPATH . 'config/config' . EXT;
+
+if (!file_exists($config)) {
+    $config = APPPATH . 'config/config-sample-mysql' . EXT;        
+
+    // If Yii can not start due to unwritable runtimePath, present an error    
+    $config = require($config);
+    $runtimePath = $config['runtimePath'];
+    if (!is_dir($runtimePath) || !is_writable($runtimePath)) {
+        // @@TODO: present html page styled like the installer
+        die (sprintf('%s should be writable by the webserver (755 or 775).', $runtimePath));
+    }
+}
+
+
+Yii::createApplication('LSYii_Application', $config)->run();
 
 /* End of file index.php */
-/* Location: ./index.php */
+/* Location: ./index.php */