build-number.yml

name: Build Number

on:
  workflow_call:
    outputs:
      build-number:
        description: "The build number generated from git tags on current SHA."
        value: ${{ jobs.build-number.outputs.build-number }}
    inputs:
      token:
        description: 'GitHub token or PAT token'
        required: false
        default: ${{ github.token }}
        type: string

concurrency:
  group: ${{ github.ref }}
  cancel-in-progress: true

jobs:
  build-number:
    runs-on: ubuntu-latest
    outputs:
      build_number: ${{ steps.build-number.outputs.build_number }}
    steps:
      - uses: actions/checkout@v4

      - name: Generate build number
        id: build-number
        env:
          INPUT_GITHUB_TOKEN: ${{ inputs.token }}
        run: |
          CURRENT_BUILD_NUMBER=$(git show-ref --tags | grep "$GITHUB_SHA" | sort -nr | head -1 | grep -oE "build-number--(\d+)" | grep -oE "\d+")
          echo "Found build number $CURRENT_BUILD_NUMBER for current SHA."

          if [ -z "${CURRENT_BUILD_NUMBER}" ]; then
            echo "No build number found for current SHA"

            # Get the latest build number
            LATEST_BUILD_NUMBER=$(git show-ref --tags | grep -oE "build-number-(\d+)" | sort -nr | head -1 | grep -oE "\d+")

            if [[ -z "${LATEST_BUILD_NUMBER}" ]]; then
              echo "No build number found in tags. Please create a tag with the format 'build-number-1' on main branch."
              exit 1
            fi

            CURRENT_BUILD_NUMBER="$((LATEST_BUILD_NUMBER + 1))"
            git tag "build-number-$CURRENT_BUILD_NUMBER"

            git config --local user.email "github-actions[bot]@users.noreply.github.com"
            git config --local user.name "github-actions[bot]"

            GITHUB_URL_PROTOCOL=$(echo "$GITHUB_SERVER_URL" | sed -E "s/https?:\/\///g")

            REMOTE_REPO="${GITHUB_URL_PROTOCOL}//oauth2:${INPUT_GITHUB_TOKEN}@${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git"
#            PUSH_PARAMETERS="${REMOTE_REPO} HEAD:${GITHUB_REF}"
            PUSH_PARAMETERS="${REMOTE_REPO}"
            echo "Pushing build number tag build-number-$CURRENT_BUILD_NUMBER to Github ($GITHUB_REF)."

            git push "$PUSH_PARAMETERS" --tags
          else
            echo "Skipping tag creation."
            exit 0
          fi

          echo "BUILD_NUMBER=$CURRENT_BUILD_NUMBER" > "$GITHUB_ENV"