ci-release.yaml

name: Release CI

on:
  workflow_dispatch:
    inputs:
      version-overwrite:
        required: false
        default: ''
        description: 'Use this to overwrite the version number to release, otherwise uses the current SNAPSHOT version (expected format x.y.z)'
        type: string

permissions: { }

jobs:
  prepare-release:
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.variables.outputs.version }}
      next-version: ${{ steps.variables.outputs.next-version }}
      release-branch: ${{ steps.variables.outputs.release-branch }}
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4.1.1

      - name: Setup Environment
        id: variables
        run: |-
          VERSION="${{ github.event.inputs.version-overwrite }}"
          if [[ -z ${VERSION} ]]; then
            CURRENT_SNAPSHOT=`yq -p=xml '.project.version' pom.xml`
            VERSION=${CURRENT_SNAPSHOT%-SNAPSHOT}
          fi
          NEXT_VERSION="${VERSION%.*}.$((${VERSION##*.} + 1))-SNAPSHOT"

          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          echo "next-version=${NEXT_VERSION}" >> $GITHUB_OUTPUT
          echo "release-branch=${VERSION%.*}.x" >> $GITHUB_OUTPUT

  create-release:
    runs-on: ubuntu-latest
    permissions:
      # Required for pushing changes via git command (rather than via GitHub API).
      # TODO: Use bot credentials for git, or rewrite the "Commit Version" step to use API instead.
      contents: write
    needs:
      - prepare-release

    env:
      VERSION: ${{ needs.prepare-release.outputs.version }}
      BRANCH_NAME: ${{ needs.prepare-release.outputs.release-branch }}

    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4.1.1

      - name: Set up JDK
        uses: actions/setup-java@v4.0.0
        with:
          distribution: 'temurin'
          java-version: '17'
          cache: 'maven'

      - name: Set Version
        run: mvn versions:set -DnewVersion=${VERSION}

      - name: Commit Version
        env:
          GITHUB_TOKEN: ${{ secrets.BOT_RELEASE_TOKEN }}
        run: |-
          MESSAGE="prepare-release: set version to ${VERSION}"
          CONTENT=$(base64 -i pom.xml)

          if [[ -z `git ls-remote --quiet --heads origin "${BRANCH_NAME}"` ]]; then
            SHA=$(git rev-parse ${GITHUB_REF#refs/heads/}:pom.xml)

            # https://gist.github.com/swinton/03e84635b45c78353b1f71e41007fc7c
            gh api --method PUT /repos/{owner}/{repo}/contents/pom.xml \
              --field message="${MESSAGE}" \
              --field content="${CONTENT}" \
              --field encoding="base64" \
              --field branch="${GITHUB_REF_NAME}" \
              --field sha="${SHA}"

            git fetch
            git reset --hard "origin/${GITHUB_REF_NAME}"
            git checkout -b "${BRANCH_NAME}"
            git push origin "${BRANCH_NAME}"
          else
            git checkout "${BRANCH_NAME}"
            SHA=$(git rev-parse ${BRANCH_NAME}:pom.xml)

            gh api --method PUT /repos/{owner}/{repo}/contents/pom.xml \
              --field message="${MESSAGE}" \
              --field content="${CONTENT}" \
              --field encoding="base64" \
              --field branch="${BRANCH_NAME}" \
              --field sha="${SHA}"
          fi

      - name: Create GitHub Release
        env:
          GITHUB_TOKEN: ${{ secrets.BOT_RELEASE_TOKEN }}
        run: |-
          gh release create "${{ needs.prepare-release.outputs.version }}" \
            --target "${{ needs.prepare-release.outputs.release-branch }}" \
            --generate-notes

  post-release:
    runs-on: ubuntu-latest
    needs:
      - prepare-release
      - create-release

    env:
      NEXT_VERSION: ${{ needs.prepare-release.outputs.next-version }}
      BRANCH_NAME: ${{ needs.prepare-release.outputs.release-branch }}

    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4.1.1
        with:
          ref: ${{ needs.prepare-release.outputs.release-branch }}

      - name: Set SNAPSHOT Version after Release
        run: mvn versions:set -DnewVersion=${NEXT_VERSION}

      - name: Commit SNAPSHOT Version
        env:
          GITHUB_TOKEN: ${{ secrets.BOT_RELEASE_TOKEN }}
        run: |-
          MESSAGE="prepare-iteration: set version to ${NEXT_VERSION}"
          CONTENT=$(base64 -i pom.xml)
          SHA=$(git rev-parse ${BRANCH_NAME}:pom.xml)

          gh api --method PUT /repos/{owner}/{repo}/contents/pom.xml \
            --field message="${MESSAGE}" \
            --field content="${CONTENT}" \
            --field encoding="base64" \
            --field branch="${BRANCH_NAME}" \
            --field sha="${SHA}"