check_tz_releases.yml

name: Check if tz git submodule is up to date

on:
  schedule:
    - cron: "0 0 * * 0"
  workflow_dispatch:

jobs:
  check_tz:
    name: Check if latest tag commit differs from the commit the submodule currently points to
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          submodules: "recursive"
          fetch-depth: 0

      - name: Run script
        shell: bash
        run: |
          set -e 

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

          latest_tag=$(git -C third_party/tz ls-remote --tags --refs --quiet origin | tail --lines 1 | awk '{print $2}' | cut --delimiter='/' --fields=3 )
          latest_tag_commit=$(git -C third_party/tz rev-list -n 1 $latest_tag)
          current_commit=$(git -C ./third_party/tz rev-parse HEAD)

          if [[ $latest_tag_commit != $current_commit ]]; then 
              echo "New tz release available: ${latest_tag}"
              new_branch="gha-bump-tz-${latest_tag}"
              git checkout -b $new_branch

              # update the submodule 
              git -C third_party/tz checkout "${latest_tag}"
              git add third_party/tz

              # update the url in valhalla_build_timezones 
              url_old=$(grep -oP "url=\"\Khttps://github.com/.*(?=\")" scripts/valhalla_build_timezones)
              url_new=$(echo ${url_old} | sed -E "s/download\/[0-9]{4}[a-z]/download\/${latest_tag}/")

              # first make sure the file is actually available

              set +e
              curl -Is --fail-with-body ${url_new} >/dev/null

              if [[ $? -eq 0 ]]; then 
                  # only replace if it's available
                  url_old_escaped=$(echo "${url_old}" | sed 's/[\&/]/\\&/g')
                  url_new_escaped=$(echo "${url_new}" | sed 's/[\&/]/\\&/g')
                  sed -i -e "s/${url_old_escaped}/${url_new_escaped}/" scripts/valhalla_build_timezones
                  git add scripts/valhalla_build_timezones

                  echo "Updated timezone shapefile download URL:"
                  git diff scripts/valhalla_build_timezones
              fi

              set -e
              # commit and push 
              git commit -m "bumped tz to ${latest_tag}"
              git push origin "${new_branch}"

              # open new PR 
              body=$(echo "See [here](https://github.com/eggert/tz/blob/main/NEWS) for the latest changes made to tz.\
              Created by workflow run [#${WORKFLOW_RUN_ID}](https://github.com/valhalla/valhalla/actions/runs/${WORKFLOW_RUN_ID})." | xargs)
              gh pr create --base master --head $new_branch --title "Bump tz to ${latest_tag}" --body "${body}"

              exit 1
          fi

          echo "tz up to date"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          WORKFLOW_RUN_ID: ${{ github.run_id }}
          WORKFLOW_JOB_ID: ${{ github.job }}