From ff7c25b7bcf8f812eecfa55d721912cf9c9654a3 Mon Sep 17 00:00:00 2001
From: Axel Heider <axelheider@gmx.de>
Date: Tue, 5 Mar 2024 16:43:43 +0100
Subject: [PATCH] CI: cancel older concurrent PR runs

- Remove the space in the workflow name to ensure there are no side
  effects when using it as an identifier.
- Act on PRs only, not on upstreaming.

Signed-off-by: Axel Heider <axelheider@gmx.de>
---
 .github/workflows/sel4test-hw.yml  | 7 ++++++-
 .github/workflows/sel4test-sim.yml | 9 ++++++++-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/sel4test-hw.yml b/.github/workflows/sel4test-hw.yml
index 0723bfb1b..379c4b1b7 100644
--- a/.github/workflows/sel4test-hw.yml
+++ b/.github/workflows/sel4test-hw.yml
@@ -6,7 +6,7 @@
 #
 # See sel4test-hw/builds.yml in the repo seL4/ci-actions for configs.
 
-name: seL4Test HW
+name: seL4Test-HW
 
 on:
   # needs PR target for secrets access; guard by requiring label
@@ -17,6 +17,11 @@ on:
 permissions:
   contents: read
 
+# Cancel older runs to reduce the load, especially on the machine queue.
+concurrency:
+  group: ${{ github.workflow }}-pr-${{ github.event.number }}
+  cancel-in-progress: true
+
 jobs:
   hw-build:
     name: HW Build
diff --git a/.github/workflows/sel4test-sim.yml b/.github/workflows/sel4test-sim.yml
index 194661929..402c686f0 100644
--- a/.github/workflows/sel4test-sim.yml
+++ b/.github/workflows/sel4test-sim.yml
@@ -6,13 +6,20 @@
 #
 # See sel4test-sim/builds.yml in the repo seL4/ci-actions for configs.
 
-name: seL4Test Sim
+name: seL4Test-Sim
 
 on:
   push:
     branches: [master]
   pull_request:
 
+# Cancel older runs to reduce the load. The workflow also runs on pushes to
+# the master brnach, but skipping or cancellation will not happen there
+# practically due to the unique run ID.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || format('run-{0}', github.run_id) }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   simulation:
     name: Simulation