./github/scripts/auto-backport: align process to source available and…

… more

Syncing a few changes that have already been implemented in scylla-pkg:

* remove condition for enterprise - since we are now running always from the `scylla-machine-image` repo
* run backport process from stable branch (which is `master`)
* improve conflict cases - by adding a comment to notify the PR owner
* pass label for each pull_request_target trigger

(cherry picked from commit 3d7c7b4)

.github/scripts/auto-backport.py

@@ -29,6 +29,7 @@ def parse_args():
     parser.add_argument('--commits', default=None, type=str, help='Range of promoted commits.')
     parser.add_argument('--pull-request', type=int, help='Pull request number to be backported')
     parser.add_argument('--head-commit', type=str, required=is_pull_request(), help='The HEAD of target branch after the pull request specified by --pull-request is merged')
+    parser.add_argument('--label', type=str, required=is_pull_request(), help='Backport label name when --pull-request is defined')
     return parser.parse_args()
 
 
@@ -47,7 +48,11 @@ def create_pull_request(repo, new_branch_name, base_branch_name, pr, backport_pr
         )
         logging.info(f"Pull request created: {backport_pr.html_url}")
         backport_pr.add_to_assignees(pr.user)
-        backport_pr.add_to_labels("conflicts") if is_draft else None
+        if is_draft:
+            backport_pr.add_to_labels("conflicts")
+            pr_comment = f"@{pr.user.login} - This PR has conflicts, therefore it was moved to `draft` \n"
+            pr_comment += "Please resolve them and mark this PR as ready for review"
+            backport_pr.create_issue_comment(pr_comment)
         logging.info(f"Assigned PR to original author: {pr.user}")
         return backport_pr
     except GithubException as e:
@@ -141,14 +146,17 @@ def main():
         closed_prs = [pr]
 
     for pr in closed_prs:
-        labels = [label.name for label in pr.labels]
-        backport_labels = [label for label in labels if backport_label_pattern.match(label)]
-        if promoted_label not in labels:
-            print(f'no {promoted_label} label: {pr.number}')
-            continue
-        if not backport_labels:
-            print(f'no backport label: {pr.number}')
-            continue
+        if args.pull_request:
+            backport_labels = [args.label]
+        else:
+            labels = [label.name for label in pr.labels]
+            backport_labels = [label for label in labels if backport_label_pattern.match(label)]
+            if promoted_label not in labels:
+                print(f'no {promoted_label} label: {pr.number}')
+                continue
+            if not backport_labels:
+                print(f'no backport label: {pr.number}')
+                continue
         commits = get_pr_commits(repo, pr, stable_branch, start_commit)
         logging.info(f"Found PR #{pr.number} with commit {commits} and the following labels: {backport_labels}")
         for backport_label in backport_labels:

.github/workflows/add-label-when-promoted.yaml

@@ -5,10 +5,12 @@ on:
     branches:
       - master
       - next-*.*
-      - enterprise
   pull_request_target:
     types: [labeled]
-    branches: [master, next, enterprise]
+    branches: [master, next]
+
+env:
+  DEFAULT_BRANCH: 'master'
 
 jobs:
   check-commit:
@@ -20,20 +22,11 @@ jobs:
       - name: Dump GitHub context
         env:
           GITHUB_CONTEXT: ${{ toJson(github) }}
-        run: echo "$GITHUB_CONTEXT"
-      - name: Set Default Branch
-        id: set_branch
-        run: |
-          if [[ "${{ github.repository }}" == *enterprise* ]]; then
-            echo "stable_branch=enterprise" >> $GITHUB_OUTPUT
-          else
-            echo "stable_branch=master" >> $GITHUB_OUTPUT
-          fi
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
           repository: ${{ github.repository }}
-          ref: ${{ env.stable_branch }}
+          ref: ${{ env.DEFAULT_BRANCH }}
           token: ${{ secrets.AUTO_BACKPORT_TOKEN }}
           fetch-depth: 0  # Fetch all history for all tags and branches
       - name: Set up Git identity
@@ -49,7 +42,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.AUTO_BACKPORT_TOKEN }}
         run: python .github/scripts/search_commits.py  --commits ${{ github.event.before }}..${{ github.sha }} --repository ${{ github.repository }} --ref ${{ github.ref }}
       - name: Run auto-backport.py when promotion completed
-        if: github.event_name == 'push' && github.ref == format('refs/heads/{0}', steps.set_branch.outputs.stable_branch)
+        if: github.event_name == 'push' && github.ref == format('refs/heads/{0}', env.DEFAULT_BRANCH)
         env:
           GITHUB_TOKEN: ${{ secrets.AUTO_BACKPORT_TOKEN }}
         run: python .github/scripts/auto-backport.py --repo ${{ github.repository }} --base-branch ${{ github.ref }} --commits ${{ github.event.before }}..${{ github.sha }}
@@ -68,4 +61,4 @@ jobs:
         if: github.event_name == 'pull_request_target' && steps.check_label.outputs.backport_label == 'true' && github.event.pull_request.merged == true
         env:
           GITHUB_TOKEN: ${{ secrets.AUTO_BACKPORT_TOKEN }}
-        run: python .github/scripts/auto-backport.py --repo ${{ github.repository }} --base-branch ${{ github.ref }} --pull-request ${{ github.event.pull_request.number }} --head-commit ${{ github.event.pull_request.base.sha }}
+        run: python .github/scripts/auto-backport.py --repo ${{ github.repository }} --base-branch ${{ github.ref }} --pull-request ${{ github.event.pull_request.number }} --head-commit ${{ github.event.pull_request.base.sha }} --label ${{ github.event.label.name }}