create-backport-branch.yml

name: Create Backport Branch

on:
  workflow_dispatch:
    inputs:
      last_release_version:
        description: 'The version of the last release. Example: 1.2.3'
        required: true
        type: string
      new_release_version:
        description: 'The version of the new release. Example: 1.3.0'
        required: true
        type: string
      last_release_git_tag:
        description: 'The git tag of the last release. Defaults to `v{last_release_version}`. Example: v1.2.3'
        required: false
        default: ''
        type: string
  workflow_call:
    inputs:
      last_release_version:
        description: 'The version of the last release. Example: 1.2.3'
        required: true
        type: string
      new_release_version:
        description: 'The version of the new release. Example: 1.3.0'
        required: true
        type: string
      last_release_git_tag:
        description: 'The git tag of the last release. Defaults to `v{last_release_version}`. Example: v1.2.3'
        required: false
        default: ''
        type: string

jobs:
  create_branch:
    runs-on: ubuntu-latest
    steps:
      - name: Extract Last Release Major and Minor Versions
        id: extract_last_versions
        run: |
          last_version='${{ inputs.last_release_version }}'
          IFS='.' read -r last_major last_minor last_patch <<< "$last_version"
          echo "last_major=$last_major" >> $GITHUB_OUTPUT
          echo "last_minor=$last_minor" >> $GITHUB_OUTPUT
          echo "last major: $last_major"
          echo "last minor: $last_minor"

      - name: Extract New Release Major and Minor Versions
        id: extract_new_versions
        run: |
          new_version='${{ inputs.new_release_version }}'
          IFS='.' read -r new_major new_minor new_patch <<< "$new_version"
          echo "new_major=$new_major" >> $GITHUB_OUTPUT
          echo "new_minor=$new_minor" >> $GITHUB_OUTPUT
          echo "new major: $new_major"
          echo "new minor: $new_minor"

      - name: Determine Bump Type
        id: determine_bump
        run: |
          new_major='${{ steps.extract_new_versions.outputs.new_major }}'
          new_minor='${{ steps.extract_new_versions.outputs.new_minor }}'
          last_major='${{ steps.extract_last_versions.outputs.last_major }}'
          last_minor='${{ steps.extract_last_versions.outputs.last_minor }}'

          if [ "$new_major" -gt "$last_major" ]; then
            echo "bump_type=major" >> $GITHUB_OUTPUT
            echo 'bump type is `major`'
          elif [ "$new_major" -eq "$last_major" ] && [ "$new_minor" -gt "$last_minor" ]; then
            echo "bump_type=minor" >> $GITHUB_OUTPUT
            echo 'bump type is `minor`'
          else
            echo "bump_type=patch" >> $GITHUB_OUTPUT
            echo 'bump type is `patch` or other'
          fi

      - name: Determine Branch Name
        id: determine_branch_name
        run: |
          bump_type='${{ steps.determine_bump.outputs.bump_type }}'
          last_major='${{ steps.extract_last_versions.outputs.last_major }}'
          last_minor='${{ steps.extract_last_versions.outputs.last_minor }}'

          if [ "$bump_type" = "major" ]; then
            branch_name="${last_major}.x.x"
          elif [ "$bump_type" = "minor" ]; then
            branch_name="${last_major}.${last_minor}.x"
          else
            branch_name=""
          fi
          echo "branch_name=$branch_name" >> $GITHUB_OUTPUT
          echo "branch name: $branch_name"

      - name: Set Last Release Git Tag
        id: set_git_tag
        if: ${{ steps.determine_branch_name.outputs.branch_name != '' }}
        run: |
          if [ -z "${{ inputs.last_release_git_tag }}" ]; then
            git_tag="v${{ inputs.last_release_version }}"
          else
            git_tag="${{ inputs.last_release_git_tag }}"
          fi
          echo "last_release_git_tag=${git_tag}" >> $GITHUB_OUTPUT
          echo "last release git tag: ${git_tag}"

      - name: Checkout Code
        if: ${{ steps.determine_branch_name.outputs.branch_name != '' }}
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
        with:
          persist-credentials: true
          token: ${{ secrets.CREATE_RELEASE }}

      - name: Create Release Branch
        if: ${{ steps.determine_branch_name.outputs.branch_name != '' }}
        run: |
          git fetch origin "refs/tags/${{ steps.set_git_tag.outputs.last_release_git_tag }}:refs/tags/${{ steps.set_git_tag.outputs.last_release_git_tag }}"
          git checkout "${{ steps.set_git_tag.outputs.last_release_git_tag }}"
          git checkout -b "${{ steps.determine_branch_name.outputs.branch_name }}"
          git push origin "${{ steps.determine_branch_name.outputs.branch_name }}"
          echo "branch created: ${{ steps.determine_branch_name.outputs.branch_name }}"