cut-new-release.yml

name: Cut a new release

on:
  workflow_dispatch:
    inputs:
      version:
        type: string
        description: Version of the next release (e.g. v0.15.0)
        required: true

env:
  git-user: github-actions[bot]
  git-email: 41898282+github-actions[bot]@users.noreply.github.com
  main-branch: main

jobs:
  workflow-metadata:
    name: Extract workflow metadata
    runs-on: ubuntu-22.04
    outputs:
      ref: ${{ steps.extract.outputs.ref }}
      base-version: ${{ steps.extract.outputs.base-version }}
    steps:
      - uses: actions/checkout@v3
        with:
          token: ${{ secrets.GH_TOKEN }}
          fetch-depth: 0

      - name: Extract
        id: extract
        shell: bash
        run: |
          REF=$(echo "${{ env.main-branch }}")
          # Valid version format
          if [[ "${{ inputs.version }}" =~ ^v([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
            # Find release branch from provided version. This resolves '0.14' from 'v0.14.0|1|2...'
            BASE_VERSION=$(echo "${{ inputs.version }}" | cut -c2- |  awk 'BEGIN{FS=OFS="."}NF--')
            echo "Finding branch: release-${BASE_VERSION}..." 
            branch_exists=$(git ls-remote --heads origin release-${BASE_VERSION}) 
            if [[ -z ${branch_exists} ]]; then
              echo "release-${BASE_VERSION} is not found." 
            else 
              echo "release-${BASE_VERSION} is found, now REF=release-${BASE_VERSION}"
              REF=$(echo "release-${BASE_VERSION}") 
            fi 
            echo ::set-output name=ref::$REF
            echo ::set-output name=base-version::$BASE_VERSION
          else
            # Fail entire job if it is not a valid format
            echo "${{ inputs.version }} is not a valid version format. Use something like 'v0.14.0'"
            exit 1
          fi

  release-branch:
    name: Prepare ${{ inputs.version }}
    runs-on: ubuntu-22.04
    needs: [workflow-metadata]
    steps:
      - uses: actions/checkout@v3
        with:
          ref: ${{ needs.workflow-metadata.outputs.ref }}
          token: ${{ secrets.GH_TOKEN }}
          fetch-depth: 0

      - name: Set git 'user.name' and 'user.email'
        run: |
          git config user.name "${{ env.git-user }}"
          git config user.email ${{ env.git-email }}

      - name: Add note for previous version
        run: |
          git fetch --all
          if [[ ${{ needs.workflow-metadata.outputs.ref }} == ${{ env.main-branch }} ]]; then
            PREV_VERSION=$(git for-each-ref --sort=-creatordate --format '%(refname)' refs/tags | grep -E "\.0$" | awk -F'refs/tags/' '{ print $2 }'| head -1)
            echo "The latest tag on ${{ env.main-branch }} is ${PREV_VERSION}"
          else
            PATCH_VERSION=$(echo ${{ inputs.version }} | awk -F'.' '{ print $3 }')
            PREV_VERSION=$(echo "v${{ needs.workflow-metadata.outputs.base-version }}.$((PATCH_VERSION - 1))")
          fi
          git fetch origin "refs/notes/*:refs/notes/*"
          NOTE_COMMIT=$(git notes --ref release-${{ needs.workflow-metadata.outputs.base-version }} list | awk '{print $2}')
          if [[ ! -z "$NOTE_COMMIT" ]]; then
            echo "Pruning previous notes in release-${{ needs.workflow-metadata.outputs.base-version }}"
            git notes --ref release-${{ needs.workflow-metadata.outputs.base-version }} remove ${NOTE_COMMIT} || true     
          fi
          echo "Adding new note: previous-version: ${PREV_VERSION},current-version: ${{ inputs.version }}"
          git notes --ref release-${{ needs.workflow-metadata.outputs.base-version }} add -m "previous-version: ${PREV_VERSION},current-version: ${{ inputs.version }}"
          git push origin 'refs/notes/*'
          
          # Since we don't push by branch creation for patch releases
          if [[ ${{ needs.workflow-metadata.outputs.ref }} != ${{ env.main-branch }} ]]; then
            git commit --allow-empty -m "Trigger next rc build for ${{ inputs.version }}" 
            git push origin release-${{ needs.workflow-metadata.outputs.base-version }} --force
          fi
      - name: Create a release branch
        if: ${{ contains(needs.workflow-metadata.outputs.ref, env.main-branch ) }}
        run: |
          git checkout -b release-${{ needs.workflow-metadata.outputs.base-version }}
          git push origin release-${{ needs.workflow-metadata.outputs.base-version }}