name: "Update image and push to Github Packages and Docker Hub when Dockerfile is changed"
# Run this workflow every time a new commit pushed to your repository
on:
  push:
    branches:
    - main
    paths:
    - 'Dockerfile'

env:
  GHCR_REPO: ghcr.io/${{ github.repository_owner }}/p2pool

jobs:
  build:
    name: "Build container for multiple architectures and push by digest"
    strategy:
      fail-fast: false
      matrix:
        os:
          - ubuntu-latest
          - ubuntu-24.04-arm
    runs-on: ${{ matrix.os }}
    steps:
      - name: Prepare platform matrix for arm64
        if: runner.arch == 'ARM64'
        run: |
          echo "PLATFORM=linux/arm64" >> $GITHUB_ENV
          echo "DIGEST_NAME=arm64" >> $GITHUB_ENV
      - name: Prepare platform matrix for amd64
        if: runner.arch == 'X64'
        run: |
          echo "PLATFORM=linux/amd64" >> $GITHUB_ENV
          echo "DIGEST_NAME=amd64" >> $GITHUB_ENV
      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.GHCR_REPO }}
      - 
        name: Get p2pool release tag
        run: echo P2POOL_TAG="$(awk -F '=' '/P2POOL_BRANCH=/ {print $2}' Dockerfile)" >> $GITHUB_ENV
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.9.0
      -
        name: Login to GitHub Container Registry
        uses: docker/login-action@v3.3.0
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      -
        name: Checkout repository
        uses: actions/checkout@v4
      -
        name: Build and and push by digest
        uses: docker/build-push-action@v6.13.0
        id: build
        with:
          outputs: type=image,"name=${{ env.GHCR_REPO }}",push-by-digest=true,name-canonical=true,push=true
          platforms: ${{ env.PLATFORM }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=registry,ref=${{ env.GHCR_REPO }}:latest

      - name: Export digest
        run: |
          mkdir -p ${{ runner.temp }}/digests
          digest="${{ steps.build.outputs.digest }}"
          touch "${{ runner.temp }}/digests/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ env.DIGEST_NAME }}
          path: ${{ runner.temp }}/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    runs-on: ubuntu-latest
    needs:
      - build
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: ${{ runner.temp }}/digests
          pattern: digests-*
          merge-multiple: true

      - name: Login to GHCR
        uses: docker/login-action@v3.3.0
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.9.0

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.GHCR_REPO }}
          tags: |
            type=sha
            type=raw,value=latest,enable={{is_default_branch}}
            type=semver,pattern={{version}},value=${{ env.P2POOL_TAG }}

      - name: Create manifest list and push
        working-directory: ${{ runner.temp }}/digests
        run: |
          docker buildx imagetools create $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.GHCR_REPO }}@sha256:%s ' *)

      - name: Inspect image
        run: |
          docker buildx imagetools inspect ${{ env.GHCR_REPO }}:${{ steps.meta.outputs.version }}