create-patch-branch.yml

---
name: "Create a Patch Branch"

on: # yamllint disable-line rule:truthy
  workflow_dispatch:
    inputs:
      cherrypick_commits:
        description: "List of space delimited commits to cherry pick"
        required: false
        default: ""

env:
  JAVA_VERSION: "11"
  JAVA_DISTRIBUTION: "corretto"

jobs:
  verify:
    runs-on: ubuntu-latest
    steps:
      - name: Check patch release type is using correct branch
        if: ${{ !startsWith(github.ref_name, 'release/') }}
        run: |
          echo "Cannot create a patch branch, please target a branch that starts with 'release/'"
          exit 1

  patch:
    needs: verify
    runs-on: ubuntu-latest
    permissions:
      contents: write
    outputs:
      branch: ${{ steps.set_output.outputs.patch_branch }}
    steps:
      - name: Checkout repo
        uses: actions/checkout@v4

      - name: Set up JDK ${{ env.JAVA_VERSION }}
        uses: actions/setup-java@v4
        with:
          java-version: ${{ env.JAVA_VERSION }}
          distribution: ${{ env.JAVA_DISTRIBUTION }}
          cache: "maven"

      - name: Configure Git user
        run: |
          git config user.name "${{ github.actor }}"
          git config user.email "${{ github.actor }}@users.noreply.github.com"

      - name: Get the version
        run: |
          echo "PROJECT_VERSION=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout | grep -v '\[.*' )" >> "$GITHUB_ENV"
          echo "PATCH_BRANCH=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout | grep -v '\[.*' | awk -F. '{print "patch/"$1"."$2".x"}')" >> "$GITHUB_ENV"

      - id: set_output
        run: echo "patch_branch=${{ env.PATCH_BRANCH }}" >> "$GITHUB_OUTPUT"

      - name: Fail for milestone versions
        if: ${{ contains(env.PROJECT_VERSION, '-M') }}
        run: |
          echo "Cannot create a patch branch on a milestone release"
          exit 1

      - name: Branch that patch
        run: git switch -c ${{ env.PATCH_BRANCH }}

      - name: Set the patch version
        run: |
          mvn -B -V -e -ntp versions:set -DnextSnapshot=true
          mvn -B -V -e -ntp versions:commit
          git add .
          git commit -m "[github-actions](${{ github.actor }}) prepare for next patch iteration"
          git push -u origin ${{ env.PATCH_BRANCH }}

  cherry_pick:
    if: ${{ github.event.inputs.cherrypick_commits != '' }}
    needs: patch
    uses: ./.github/workflows/cherrypick.yml
    with:
      branch: ${{ needs.patch.outputs.branch }}
      commits: ${{ github.event.inputs.cherrypick_commits }}