From dc0dfd3e11dad050f9b5fbe900524694f441f40b Mon Sep 17 00:00:00 2001
From: Joshua Schmid <jaiks@posteo.de>
Date: Mon, 6 Nov 2023 11:43:10 +0100
Subject: [PATCH] chore: improve backporting process

* now contains all the commits of a PR, not only the last one
* now copies labels on the backport PRs
* now copies milestones on the backport PRS
* now copies requested reviewers to the backport PRS

The action instructions for manually merging were mostly wrong and rarely worked.

The actions are now more descriptive and separated (using worktrees)

Signed-off-by: Joshua Schmid <jaiks@posteo.de>
(cherry picked from commit 2a8191e26346ab5137442862bb87bfbb7c3b2b09)
---
 .github/workflows/backport.yml | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/.github/workflows/backport.yml b/.github/workflows/backport.yml
index ba81370960f5..c2cc8d2a5100 100644
--- a/.github/workflows/backport.yml
+++ b/.github/workflows/backport.yml
@@ -1,25 +1,27 @@
 name: Backport
 on:
   pull_request_target:
-    types:
-      - closed
-      - labeled
-
+    types: [closed]
+permissions:
+  contents: write # so it can comment
+  pull-requests: write # so it can create pull requests
 jobs:
   backport:
     name: Backport
     runs-on: ubuntu-latest
-    if: >
-      github.event.pull_request.merged
-      && (
-        github.event.action == 'closed'
-        || (
-          github.event.action == 'labeled'
-          && contains(github.event.label.name, 'backport')
-        )
-      )
+    if: github.event.pull_request.merged
     steps:
-      # - uses: tibdex/backport@v2
-      - uses: tibdex/backport@2e217641d82d02ba0603f46b1aeedefb258890ac
+      - uses: actions/checkout@v4
+      - name: Create backport pull requests
+        uses: korthout/backport-action@cb79e4e5f46c7d7d653dd3d5fa8a9b0a945dfe4b # v2.1.0
         with:
           github_token: ${{ secrets.PAT }}
+          pull_title: '[backport -> ${target_branch}] ${pull_title}'
+          merge_commits: 'skip'
+          copy_labels_pattern: ^(?!backport ).* # copies all labels except those starting with "backport "
+          label_pattern: ^backport (release\/[^ ]+)$ # filters for labels starting with "backport " and extracts the branch name
+          pull_description: |-
+            Automated backport to `${target_branch}`, triggered by a label in #${pull_number}.
+          copy_assignees: true
+          copy_milestone: true
+          copy_requested_reviewers: true