From 86ad3ae57e6c467e8fc9966324380fd136fb71f3 Mon Sep 17 00:00:00 2001
From: Manos Vlassis <57320708+mvlassis@users.noreply.github.com>
Date: Tue, 31 Mar 2026 11:42:33 +0200
Subject: [PATCH] feat: add automated backport support (#171)

* feat: add automated backport support with latest track

* chore: sync PR workflow comments with admission-webhook-operator

(cherry picked from commit 431c378b75f5d9a03d20c8ef5a13d300cf419b2a)
---
 .github/automatic_backport_tracks.yaml        |  2 ++
 .github/workflows/on_pull_request.yaml        | 10 ++++++++
 .github/workflows/on_pull_request_closed.yaml | 23 +++++++++++++++++++
 3 files changed, 35 insertions(+)
 create mode 100644 .github/automatic_backport_tracks.yaml
 create mode 100644 .github/workflows/on_pull_request_closed.yaml

diff --git a/.github/automatic_backport_tracks.yaml b/.github/automatic_backport_tracks.yaml
new file mode 100644
index 0000000..b2c35e3
--- /dev/null
+++ b/.github/automatic_backport_tracks.yaml
@@ -0,0 +1,2 @@
+automatic_backport_tracks:
+  -   track/ckf-1.10
diff --git a/.github/workflows/on_pull_request.yaml b/.github/workflows/on_pull_request.yaml
index 3d7eef1..d5477af 100644
--- a/.github/workflows/on_pull_request.yaml
+++ b/.github/workflows/on_pull_request.yaml
@@ -1,6 +1,7 @@
 name: On Pull Request
 
 # On pull_request, we:
+# * create backport labels if it is against main, only when the PR is opened/reopened
 # * always publish to charmhub at latest/edge/branchname
 # * always run tests
 
@@ -9,6 +10,15 @@ on:
 
 jobs:
 
+  populate-labels:
+    name: Populate labels
+    if: github.base_ref == 'main' && (github.event.action == 'opened' || github.event.action == 'reopened')
+    uses: canonical/charmed-kubeflow-workflows/.github/workflows/populate-labels.yaml@main
+    secrets: inherit
+    with:
+      track_file_path: ".github/automatic_backport_tracks.yaml"
+      label_prefix: "backport "
+
   tests:
     name: Run Tests
     uses: ./.github/workflows/integrate.yaml
diff --git a/.github/workflows/on_pull_request_closed.yaml b/.github/workflows/on_pull_request_closed.yaml
new file mode 100644
index 0000000..bf4c1de
--- /dev/null
+++ b/.github/workflows/on_pull_request_closed.yaml
@@ -0,0 +1,23 @@
+name: On Pull Request Closed
+
+# When a pull request is pushed on the main branch, automatically
+# create backport PRs according to the labels on the pull request.
+# If there are conflicts, create a PR but leave it as draft.
+
+on:
+  pull_request_target:
+    types: [closed]
+    branches:
+    - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+
+  backport:
+    name: Backport pull request
+    if: github.event.pull_request.merged
+    uses: canonical/charmed-kubeflow-workflows/.github/workflows/backport-pr.yaml@main
+    secrets: inherit