backport.yml

# SPDX-FileCopyrightText: 2026 Oak Ridge National Laboratory and Contributors
#
# SPDX-License-Identifier: Apache-2.0

name: Backport PR

on:
  workflow_dispatch:
    inputs:
      pr:
        description: Pull Request number
        required: true
      target_branch:
        description: Branch to backport to
        required: true

permissions: {}

jobs:
  backport:
    environment: backport
    runs-on: ubuntu-latest
    name: Backport
    env:
      GH_TOKEN: ${{ secrets.BACKPORT_TOKEN }}
      BRANCH: ${{ github.event.inputs.target_branch }}
      PR: ${{ github.event.inputs.pr }}
    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v4
        with:
          fetch-depth: 0
          token: ${{ secrets.BACKPORT_TOKEN }}
      - name: Create backport
        run: |
          commit_hash=$(gh pr view "${PR}" --repo ornladios/ADIOS2 --json mergeCommit --jq '.mergeCommit.oid')
          if [ -z "$commit_hash" ] || [ "$commit_hash" = "null" ]; then
            echo "Error: PR ${PR} is not merged yet"
            exit 1
          fi

          git config user.name "ornladios-robot"
          git config user.email "ornladios-robot[bot]@users.noreply.github.com"
          gh auth setup-git

          git checkout --track "origin/${BRANCH}"
          git checkout -b "backport-to-${BRANCH}-${PR}"
          gh pr view --json commits --jq '.commits[].oid' "${PR}" | xargs -n1 git cherry-pick --mainline 1 -x 
          git push -f https://github.com/ornladios-robot/ADIOS2.git "backport-to-${BRANCH}-${PR}"
          gh api repos/ornladios/ADIOS2/pulls \
            --method POST \
            -f head="ornladios-robot:backport-to-${BRANCH}-${PR}" \
            -f base="${BRANCH}" \
            -f title="Backport #${PR} to ${BRANCH}" \
            -f body="Backports #${PR}"