check if fredy config exists and is accessible

lib/utils.js

@@ -180,6 +180,23 @@ function buildHash(...inputs) {
  */
 let config = {};
 
+/**
+ * If the config exists, but cannot be accessed, we quit Fredy as something is fishy here.
+ * @returns {Promise<boolean>}
+ */
+export async function checkIfConfigIsAccessible() {
+  const path = new URL('../conf/config.json', import.meta.url);
+  try {
+    if (!fs.existsSync(path)) {
+      return true;
+    }
+    fs.accessSync(path, fs.constants.R_OK);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
 /**
  * Read config JSON from disk (conf/config.json) and parse it.
  * @returns {Promise<any>} Parsed configuration object.