name: Mirror deletions

on:
  delete:

permissions:
  contents: read

jobs:
  delete:
    runs-on: ubuntu-24.04
    timeout-minutes: 10
    steps:
      - name: Delete the ref from GitHub once Gitea no longer has it
        env:
          MIRROR_GITHUB_TOKEN: ${{ secrets.MIRROR_GITHUB_TOKEN }}
          MIRROR_URL: https://github.com/larvit/smpp-js.git
          REF: ${{ github.event.ref }}
          SOURCE_URL: ${{ github.server_url }}/${{ github.repository }}.git
        run: |
          # Gitea Actions sends the full ref name here, where its webhooks send the short one.
          case "$REF" in
            refs/heads/*|refs/tags/*) ;;
            *) echo "delete event names '$REF', not a full branch or tag ref"; exit 1 ;;
          esac

          # ls-remote --exit-code: 0 the ref exists, 2 it does not, anything else the remote could not be read.
          on_gitea=0
          git ls-remote --exit-code "$SOURCE_URL" "$REF" > /dev/null || on_gitea=$?
          if [ "$on_gitea" -ne 2 ]; then exit "$on_gitea"; fi

          on_github=0
          git ls-remote --exit-code "$MIRROR_URL" "$REF" > /dev/null || on_github=$?
          if [ "$on_github" -eq 2 ]; then exit 0; fi
          if [ "$on_github" -ne 0 ]; then exit "$on_github"; fi

          git init --bare --quiet mirror.git
          git -C mirror.git -c credential.helper= \
            -c credential.helper='!f() { echo username=x-access-token; echo "password=$MIRROR_GITHUB_TOKEN"; }; f' \
            push "$MIRROR_URL" ":$REF"