update_tzdb.yml

name: TZDB version update

on:
  workflow_dispatch:
  schedule:
    - cron: '0 3 * * 1,4'

jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - uses: actions/setup-java@v4
        with:
          distribution: 'temurin'
          java-version: 21

      - id: current-tzdb-version
        run: |
          echo 'tzdb-version=$(grep "ianaVersion" "tzdb_version.properties" | cut -d'=' -f2)' >> $GITHUB_OUTPUT

      - id: latest-tzdb-version
        run: |
          wget -q https://data.iana.org/time-zones/tzdata-latest.tar.gz
          tar -xf tzdata-latest.tar.gz version
          LATEST_VERSION=$(cat version)
          echo "tzdb-version=$LATEST_VERSION" >> $GITHUB_OUTPUT
          rm tzdata-latest.tar.gz
          rm version

      - id: should-run
        run: |
          echo "Current version is >>${{ steps.current-tzdb-version.outputs.tzdb-version }}<<"
          echo "Latest versions is >>${{ steps.latest-tzdb-version.outputs.tzdb-version }}<<"
          if [ "${{ steps.current-tzdb-version.outputs.tzdb-version }}" != "${{ steps.latest-tzdb-version.outputs.tzdb-version }}" ]; 
          then 
            echo 'version-changed=true' >> $GITHUB_OUTPUT 
          fi

      - uses: gradle/actions/setup-gradle@v4
        if: steps.should-run.outputs.version-changed

      - run: ./gradlew generateLazyZoneRules -Plazythreetenbp.tzdbVersion=${{ steps.latest-tzdb-version.outputs.tzdb-version }}
        if: steps.should-run.outputs.version-changed

      - run: git status

      - name: Create Pull Request
        if: steps.should-run.outputs.version-changed
        uses: peter-evans/create-pull-request@v7
        with:
          token: ${{ secrets.PUBLIC_REPO_TOKEN }}
          commit-message: "Update TZDB to ${{ steps.latest-tzdb-version.outputs.tzdb-version }}"
          committer: GitHub <noreply@github.com>
          author: ${{ github.actor }} <${{ github.actor }}@users.noreply.github.com>
          delete-branch: true
          title: "Update TZDB to ${{ steps.latest-tzdb-version.outputs.tzdb-version }}"
          body: |
            Update TZDB to **${{ steps.latest-tzdb-version.outputs.tzdb-version }}**
            
            Details: https://www.iana.org/time-zones