From 15c4e159933a08adacd524b8efcf68bd15281a05 Mon Sep 17 00:00:00 2001
From: Philip Chimento <pchimento@igalia.com>
Date: Tue, 25 Aug 2026 12:51:39 -0700
Subject: [PATCH] Handle auto-rebase actions in CI table

A limitation of the engine-tests-report workflow running as a separate,
trusted workflow was that if you rebased a branch in the GitHub UI using
the "Update branch" button, it wouldn't have access to the PR number
in github.event.workflow_run.pull_requests. This array is allowed to be
empty according to the GitHub Actions docs. So the table wouldn't get
created or updated.

So instead save the PR number while preparing to run the engine-tests
jobs (the original, untrusted workflow always has a PR number) and
upload it as an artifact, which is downloaded by the engine-tests-report
workflow.

Another option might be to use the jwalton/gh-find-current-pr action,
but I wasn't super confident it would be actively maintained.

LLM disclosure: I used a bot to evaluate a couple of potential
solutions, generated one, then hand-edited the generated code (it
initially didn't work)
---
 .github/workflows/engine-tests-report.yml | 19 ++++++++++++++++++-
 .github/workflows/engine-tests.yml        | 11 ++++++++++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/engine-tests-report.yml b/.github/workflows/engine-tests-report.yml
index c8d2dfb71e8..5c09291fd01 100644
--- a/.github/workflows/engine-tests-report.yml
+++ b/.github/workflows/engine-tests-report.yml
@@ -42,6 +42,23 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           run-id: ${{ github.event.workflow_run.id }}
 
+      - name: Download PR number
+        uses: actions/download-artifact@v8
+        with:
+          name: pr_number.txt
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+
+      - name: Read PR number
+        id: pr
+        run: |
+          PR_NUMBER="$(head pr_number.txt -n1)"
+          if [[ ! "$PR_NUMBER" =~ ^[1-9][0-9]*$ ]]; then
+            echo "Unexpected contents of pr_number.txt: $PR_NUMBER"
+            exit 1
+          fi
+          echo "number=$PR_NUMBER" >> "$GITHUB_OUTPUT"
+
       - name: Check for results
         id: check
         run: |
@@ -63,4 +80,4 @@ jobs:
         with:
           path: comment-body.txt
           header: test262-engine-results
-          number: ${{ github.event.workflow_run.pull_requests[0].number }}
+          number: ${{ steps.pr.outputs.number }}
diff --git a/.github/workflows/engine-tests.yml b/.github/workflows/engine-tests.yml
index f7679c50c64..922bf55b2e2 100644
--- a/.github/workflows/engine-tests.yml
+++ b/.github/workflows/engine-tests.yml
@@ -5,7 +5,7 @@ on:
 
 jobs:
   changed-tests:
-    name: Identify changed tests
+    name: Prepare engine tests run
     runs-on: ubuntu-latest
     outputs:
       any_changed: ${{ steps.changed.outputs.any_changed }}
@@ -20,6 +20,15 @@ jobs:
         with:
           files: test/
 
+      - name: Record PR number
+        run: echo "${{ github.event.number }}" > pr_number.txt
+
+      - name: Upload PR number
+        uses: actions/upload-artifact@v7
+        with:
+          path: pr_number.txt
+          archive: false
+
   # Future work:
   # - Run each step of the matrix on main as well, and indicate in the table
   #   whether a test moved from passing to failing or vice versa