tag-date.yml

name: Tag repository by date

on:
  workflow_dispatch:

permissions:
  contents: write

env:
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

jobs:
  tag:
    name: Create date tag
    runs-on: ubuntu-24.04

    steps:
      - name: Checkout source code
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Compute date tag
        id: version
        run: |
          tag_date="$(date -u +'%Y.%m.%d')"
          base_tag="repo-${tag_date}"
          base_tag_regex="$(printf '%s' "${base_tag}" | sed 's/[][(){}.^$*+?|\\]/\\&/g')"

          tags="$(
            git ls-remote --tags origin "refs/tags/${base_tag}*" |
              awk '{print $2}' |
              sed 's#refs/tags/##; s#\\^{}##' |
              sort -u
          )"

          highest_revision=0
          while IFS= read -r tag; do
            [ -n "${tag}" ] || continue
            if [ "${tag}" = "${base_tag}" ]; then
              if [ "${highest_revision}" -lt 1 ]; then
                highest_revision=1
              fi
            elif [[ "${tag}" =~ ^${base_tag_regex}-r([0-9]+)$ ]]; then
              revision="${BASH_REMATCH[1]}"
              if [ "${revision}" -gt "${highest_revision}" ]; then
                highest_revision="${revision}"
              fi
            fi
          done <<< "${tags}"

          if [ "${highest_revision}" -eq 0 ]; then
            tag_name="${base_tag}"
          else
            tag_name="${base_tag}-r$((highest_revision + 1))"
          fi

          echo "tag_name=${tag_name}" >> "$GITHUB_OUTPUT"
          echo "tag_date=${tag_date}" >> "$GITHUB_OUTPUT"

      - name: Create date tag
        env:
          TAG_NAME: ${{ steps.version.outputs.tag_name }}
          TAG_DATE: ${{ steps.version.outputs.tag_date }}
        run: |
          if git ls-remote --exit-code --tags origin "refs/tags/${TAG_NAME}" >/dev/null; then
            echo "Tag ${TAG_NAME} already exists" >&2
            exit 1
          fi

          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git tag -a "${TAG_NAME}" -m "Repository version ${TAG_DATE}"
          git push origin "refs/tags/${TAG_NAME}"