From 52077a03d9fb464e28a406fb151daff30a4cbd33 Mon Sep 17 00:00:00 2001
From: "Michael B. Gale" <mbg@github.com>
Date: Wed, 17 Jun 2026 15:18:09 +0100
Subject: [PATCH] Ignore empty repository property

---
 lib/entry-points.js     |  2 +-
 src/config/file.test.ts | 11 +++++++++++
 src/config/file.ts      |  2 +-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/lib/entry-points.js b/lib/entry-points.js
index ff60cfa20..32474afe4 100644
--- a/lib/entry-points.js
+++ b/lib/entry-points.js
@@ -158539,7 +158539,7 @@ function getConfigFileInput(logger, actions, repositoryProperties) {
     return input;
   }
   const propertyValue = repositoryProperties["github-codeql-config-file" /* CONFIG_FILE */];
-  if (propertyValue !== void 0) {
+  if (propertyValue !== void 0 && propertyValue.trim().length > 0) {
     logger.info(
       `Using configuration file input from repository property: ${propertyValue}`
     );
diff --git a/src/config/file.test.ts b/src/config/file.test.ts
index c27a3ff5c..4c511c1a7 100644
--- a/src/config/file.test.ts
+++ b/src/config/file.test.ts
@@ -56,3 +56,14 @@ test("getConfigFileInput returns repository property value", async (t) => {
     ),
   );
 });
+
+test("getConfigFileInput ignores empty repository property value", async (t) => {
+  const logger = new RecordingLogger();
+  const actionsEnv = getTestActionsEnv();
+
+  // Since the repository property value is an empty/whitespace string, we should ignore it.
+  const result = getConfigFileInput(logger, actionsEnv, {
+    [RepositoryPropertyName.CONFIG_FILE]: "   ",
+  });
+  t.is(result, undefined);
+});
diff --git a/src/config/file.ts b/src/config/file.ts
index 6197e50cc..24613dc55 100644
--- a/src/config/file.ts
+++ b/src/config/file.ts
@@ -23,7 +23,7 @@ export function getConfigFileInput(
   const propertyValue =
     repositoryProperties[RepositoryPropertyName.CONFIG_FILE];
 
-  if (propertyValue !== undefined) {
+  if (propertyValue !== undefined && propertyValue.trim().length > 0) {
     logger.info(
       `Using configuration file input from repository property: ${propertyValue}`,
     );