.github/workflows/docker.yml

name: docker

on:
  push:
    branches:
      - "main"
  release:
    types: [published]

permissions:
  contents: read

env:
  REGISTRY: pyfound/black

jobs:
  build:
    if: github.repository == 'psf/black'
    runs-on: ${{ matrix.runner }}
    name: build (${{ matrix.platform }})
    strategy:
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm
    steps:
      - name: Checkout
        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
        with:
          persist-credentials: false

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0

      - name: Login to DockerHub
        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Prepare
        id: prepare
        run: echo "platform=${platform//\//-}" >> $GITHUB_OUTPUT
        env:
          platform: ${{ matrix.platform }}

      - name: Build and push
        id: build
        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
        with:
          context: .
          platforms: ${{ matrix.platform }}
          outputs: type=image,push-by-digest=true,name-canonical=true,push=true
          tags: ${{ env.REGISTRY }}
          cache-from: type=gha,scope=${{ steps.prepare.outputs.platform }}
          cache-to: type=gha,scope=${{ steps.prepare.outputs.platform }},mode=max

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

      - name: Upload digest
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
        with:
          name: digests-${{ steps.prepare.outputs.platform }}
          path: digests/*
          if-no-files-found: error

  push:
    runs-on: ubuntu-latest
    needs: build

    steps:
      - name: Checkout
        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
        with:
          persist-credentials: false

      - name: Download digests
        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
        with:
          path: digests
          pattern: digests-*
          merge-multiple: true

      - name: Login to DockerHub
        uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0

      - name: Create manifest list and push
        run: |
          TAGS="-t $REGISTRY:latest"

          if [[ "$EVENT_NAME" == "release" ]]; then
            TAGS="$TAGS -t $REGISTRY:$(git describe --candidates=0 --tags)"

            if [[ "$PRERELEASE" == "true" ]]; then
              TAGS="$TAGS -t $REGISTRY:latest_prerelease"
            else
              TAGS="$TAGS -t $REGISTRY:latest_release"
            fi
          else
            TAGS="$TAGS -t $REGISTRY:latest_non_release"
          fi

          cd digests
          docker buildx imagetools create $TAGS $(printf "$REGISTRY@sha256:%s " *)
        env:
          EVENT_NAME: ${{ github.event_name }}
          PRERELEASE: ${{ github.event.release.prerelease }}

      - name: Inspect image
        run: docker buildx imagetools inspect $REGISTRY:latest