From 7525a07863e933560cb4c12c37d5bb3bea13c9e0 Mon Sep 17 00:00:00 2001
From: ohmayr <omairn@google.com>
Date: Thu, 22 Oct 2026 00:24:10 +0000
Subject: [PATCH] ci: cancel superseded PR runs in presubmit workflows

Configure concurrency groups on presubmit.yaml, windows-presubmit.yaml,
presubmit-bun.yml, and generator-tests.yaml to cancel in-progress runs
when a newer commit is pushed to the same pull request, matching
breaking-change-check.yaml, generation_check.yaml, and
librarian_tidy.yml. Scope cancel-in-progress on generator-tests.yaml to
pull_request events so post-merge push runs on main always complete.
---
 .github/workflows/generator-tests.yaml   | 4 ++++
 .github/workflows/presubmit-bun.yml      | 4 ++++
 .github/workflows/presubmit.yaml         | 5 +++++
 .github/workflows/windows-presubmit.yaml | 5 +++++
 4 files changed, 18 insertions(+)

diff --git a/.github/workflows/generator-tests.yaml b/.github/workflows/generator-tests.yaml
index 2e9a5899f7ab..2785163d6d9f 100644
--- a/.github/workflows/generator-tests.yaml
+++ b/.github/workflows/generator-tests.yaml
@@ -15,6 +15,10 @@ on:
       - '.github/workflows/generator-tests.yaml'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   presubmit:
     if: github.event_name == 'pull_request'
diff --git a/.github/workflows/presubmit-bun.yml b/.github/workflows/presubmit-bun.yml
index 6aa9910c5510..034e3a0f25ec 100644
--- a/.github/workflows/presubmit-bun.yml
+++ b/.github/workflows/presubmit-bun.yml
@@ -5,6 +5,10 @@ on:
   pull_request:
 name: presubmit-bun
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 env:
   JS_RUNTIME: bun
   MOCHA_PARALLEL: 'false'
diff --git a/.github/workflows/presubmit.yaml b/.github/workflows/presubmit.yaml
index 385220b2fe67..675a0988b9a8 100644
--- a/.github/workflows/presubmit.yaml
+++ b/.github/workflows/presubmit.yaml
@@ -4,6 +4,11 @@ permissions:
 on:
   pull_request:
 name: presubmit
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   setup:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/windows-presubmit.yaml b/.github/workflows/windows-presubmit.yaml
index afd68aee344a..d883e5d22c3f 100644
--- a/.github/workflows/windows-presubmit.yaml
+++ b/.github/workflows/windows-presubmit.yaml
@@ -4,6 +4,11 @@ permissions:
 on:
   pull_request:
 name: presubmit-windows
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   setup:
     runs-on: ubuntu-latest