From da41398e37ef581d83fc80382c05bbf9cdd02b45 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 18 Sep 2026 12:51:49 +0000
Subject: [PATCH] Add descriptive error for missing updater image catalog entry

---
 __tests__/main.test.ts | 34 ++++++++++++++++++++++++++++++++++
 dist/main.js           | 11 +++++++++++
 src/main.ts            | 12 ++++++++++++
 3 files changed, 57 insertions(+)

diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
index de5868e57..5eee43cf9 100644
--- a/__tests__/main.test.ts
+++ b/__tests__/main.test.ts
@@ -412,6 +412,40 @@ describe('run', () => {
     })
   })
 
+  describe('when the package manager has no configured updater image', () => {
+    beforeEach(() => {
+      jest.spyOn(ImageService, 'pull')
+      jest.spyOn(ApiClient.prototype, 'getJobDetails').mockImplementationOnce(
+        jest.fn(async () => {
+          return {'package-manager': 'unknown_ecosystem'} as JobDetails
+        })
+      )
+      context = new Context()
+    })
+
+    test('it fails the workflow without attempting to pull images', async () => {
+      await run(context)
+
+      expect(core.setFailed).toHaveBeenCalledWith(
+        expect.stringContaining('Error fetching updater images')
+      )
+      // eslint-disable-next-line @typescript-eslint/unbound-method
+      expect(ImageService.pull).not.toHaveBeenCalled()
+    })
+
+    test('it relays a descriptive failure message to the dependabot service', async () => {
+      await run(context)
+
+      expect(reportJobErrorSpy).toHaveBeenCalledWith({
+        'error-type': 'actions_workflow_image',
+        'error-details': {
+          'action-error': expect.stringContaining('unknown_ecosystem')
+        }
+      })
+      expect(markJobAsProcessedSpy).toHaveBeenCalled()
+    })
+  })
+
   describe('when there is an error pulling all images', () => {
     beforeEach(() => {
       jest
diff --git a/dist/main.js b/dist/main.js
index 723e033bf..7cb202009 100644
--- a/dist/main.js
+++ b/dist/main.js
@@ -100769,6 +100769,17 @@ async function run(context3) {
     const details = await apiClient.getJobDetails();
     let updaterImage = params.updaterImage || updaterImageName(details["package-manager"]);
     let proxyImage = PROXY_IMAGE_NAME;
+    if (!updaterImage) {
+      await failJob(
+        apiClient,
+        "Error fetching updater images",
+        new Error(
+          `No updater image is configured for package manager '${details["package-manager"]}' in this action revision`
+        ),
+        "actions_workflow_image" /* Image */
+      );
+      return;
+    }
     const sendMetricsWithPackageManager = async (name, metricType, value, additionalTags = {}) => {
       try {
         await apiClient.sendMetrics(name, metricType, value, {
diff --git a/src/main.ts b/src/main.ts
index df04b002d..a36198cf3 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -80,6 +80,18 @@ export async function run(context: Context): Promise<void> {
       params.updaterImage || updaterImageName(details['package-manager'])
     let proxyImage = PROXY_IMAGE_NAME
 
+    if (!updaterImage) {
+      await failJob(
+        apiClient,
+        'Error fetching updater images',
+        new Error(
+          `No updater image is configured for package manager '${details['package-manager']}' in this action revision`
+        ),
+        DependabotErrorType.Image
+      )
+      return
+    }
+
     // The sendMetrics function is used to send metrics to the API client.
     // It uses the package manager as a tag to identify the metric.
     const sendMetricsWithPackageManager: MetricReporter = async (