# This workflow (re)builds and pushes a Docker image containing the
# protobuf build tools used by the other workflows.
#
# When making changes that require updates to the builder image, you
# should merge the updates first and wait for this workflow to complete,
# so that the changes will be available for the dependent workflows.
#

name: Build & Push Proto Builder Image
on:
  pull_request:
    paths:
      - "proto/*"
  push:
    branches:
      - master
    paths:
      - "proto/*"
  schedule:
    # run this job once a month to recieve any go or buf updates
    - cron: "0 9 1 * *"

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: tendermint/docker-build-proto

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2.4.0
      - name: Check out and assign tags
        id: prep
        run: |
          DOCKER_IMAGE="${REGISTRY}/${IMAGE_NAME}"
          VERSION=noop
          if [[ "$GITHUB_REF" == "refs/tags/*" ]]; then
            VERSION="${GITHUB_REF#refs/tags/}"
          elif [[ "$GITHUB_REF" == "refs/heads/*" ]]; then
            VERSION="$(echo "${GITHUB_REF#refs/heads/}" | sed -r 's#/+#-#g')"
            if [[ "${{ github.event.repository.default_branch }}" = "$VERSION" ]]; then
              VERSION=latest
            fi
          fi
          TAGS="${DOCKER_IMAGE}:${VERSION}"
          echo ::set-output name=tags::"${TAGS}"

      - name: Set up docker buildx
        uses: docker/setup-buildx-action@v1.6.0

      - name: Log in to the container registry
        uses: docker/login-action@v1.13.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and publish image
        uses: docker/build-push-action@v2.9.0
        with:
          context: ./proto
          file: ./proto/Dockerfile
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.prep.outputs.tags }}