Add a new function used to determine where to retrieve config from

src/config-utils.test.ts

@@ -152,6 +152,18 @@ test("Octokit not used when reading local config", async t => {
   });
 });
 
+test("Remote and local configuration paths correctly identified", t => {
+  // If the path starts with ./, look locally
+  t.assert(configUtils.isLocal('./file'));
+  t.assert(configUtils.isLocal('./file@name'));
+
+  // Otherwise, if the path contains @ (branch specifier), assume it's a remote repo
+  t.false(configUtils.isLocal('octo-org/codeql-config/config.yaml@main'));
+
+  // Otherwise look locally (this is the fallback)
+  t.assert(configUtils.isLocal('file'));
+});
+
 function doInvalidInputTest(
   testName: string,
   inputFileContents: string,

src/config-utils.ts

@@ -250,6 +250,15 @@ function initConfig(): Config {
   return config;
 }
 
+export function isLocal(configPath: string): boolean {
+  // If the path starts with ./, look locally
+  if (configPath.indexOf("./") === 0) {
+    return true;
+  }
+
+  return (configPath.indexOf("@") === -1);
+}
+
 function getConfigFolder(): string {
   return util.getRequiredEnvParam('RUNNER_TEMP');
 }