build-docker.yml

# Build and publish a Docker image.
#
# Assumed to run as a subworkflow of .github/workflows/release.yml; specifically, as a local
# artifacts job within `cargo-dist`.
#
# TODO(charlie): Ideally, the publish step would happen as a publish job within `cargo-dist`, but
# sharing the built image as an artifact between jobs is challenging.
name: "Build Docker image"

on:
  workflow_call:
    inputs:
      plan:
        required: true
        type: string
  pull_request:
    paths:
      - .github/workflows/build-docker.yml

env:
  UV_BASE_IMG: ghcr.io/${{ github.repository_owner }}/uv

jobs:
  docker-build:
    name: Build Docker image (ghcr.io/astral-sh/uv) for ${{ matrix.platform }}
    runs-on: ubuntu-latest
    environment:
      name: release
    strategy:
      fail-fast: false
      matrix:
        platform:
          - linux/amd64
          - linux/arm64
    steps:
      - uses: actions/checkout@v4
        with:
          submodules: recursive

      - uses: docker/setup-buildx-action@v3

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

      - name: Check tag consistency
        if: ${{ inputs.plan != '' && !fromJson(inputs.plan).announcement_tag_is_implicit }}
        run: |
          version=$(grep "version = " pyproject.toml | sed -e 's/version = "\(.*\)"/\1/g')
          if [ "${{ fromJson(inputs.plan).announcement_tag }}" != "${version}" ]; then
            echo "The input tag does not match the version from pyproject.toml:" >&2
            echo "${{ fromJson(inputs.plan).announcement_tag }}" >&2
            echo "${version}" >&2
            exit 1
          else
            echo "Releasing ${version}"
          fi

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.UV_BASE_IMG }}
          # Defining this makes sure the org.opencontainers.image.version OCI label becomes the actual release version and not the branch name
          tags: |
            type=raw,value=dry-run,enable=${{ inputs.plan == '' || fromJson(inputs.plan).announcement_tag_is_implicit }}
            type=pep440,pattern={{ version }},value=${{ inputs.plan != '' && fromJson(inputs.plan).announcement_tag || 'dry-run' }},enable=${{ inputs.plan != '' && !fromJson(inputs.plan).announcement_tag_is_implicit }}

      - name: Normalize Platform Pair (replace / with -)
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_TUPLE=${platform//\//-}" >> $GITHUB_ENV

      # Adapted from https://docs.docker.com/build/ci/github-actions/multi-platform/
      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: ${{ matrix.platform }}
          cache-from: type=gha,scope=uv-${{ env.PLATFORM_TUPLE }}
          cache-to: type=gha,mode=min,scope=uv-${{ env.PLATFORM_TUPLE }}
          labels: ${{ steps.meta.outputs.labels }}
          outputs: type=image,name=${{ env.UV_BASE_IMG }},push-by-digest=true,name-canonical=true,push=${{ inputs.plan != '' && !fromJson(inputs.plan).announcement_tag_is_implicit }}

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

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

  docker-publish:
    name: Publish Docker image (ghcr.io/astral-sh/uv)
    runs-on: ubuntu-latest
    environment:
      name: release
    needs:
      - docker-build
    if: ${{ inputs.plan != '' && !fromJson(inputs.plan).announcement_tag_is_implicit }}
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

      - uses: docker/setup-buildx-action@v3

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.UV_BASE_IMG }}
          # Order is on purpose such that the label org.opencontainers.image.version has the first pattern with the full version
          tags: |
            type=pep440,pattern={{ version }},value=${{ fromJson(inputs.plan).announcement_tag }}
            type=pep440,pattern={{ major }}.{{ minor }},value=${{ fromJson(inputs.plan).announcement_tag }}

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

      # Adapted from https://docs.docker.com/build/ci/github-actions/multi-platform/
      - name: Create manifest list and push
        working-directory: /tmp/digests
        # The jq command expands the docker/metadata json "tags" array entry to `-t tag1 -t tag2 ...` for each tag in the array
        # The printf will expand the base image with the `<UV_BASE_IMG>@sha256:<sha256> ...` for each sha256 in the directory
        # The final command becomes `docker buildx imagetools create -t tag1 -t tag2 ... <UV_BASE_IMG>@sha256:<sha256_1> <UV_BASE_IMG>@sha256:<sha256_2> ...`
        run: |
          docker buildx imagetools create \
            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.UV_BASE_IMG }}@sha256:%s ' *)

  docker-publish-extra:
    name: Publish additional Docker image based on ${{ matrix.image-mapping }}
    runs-on: ubuntu-latest
    environment:
      name: release
    needs:
      - docker-publish
    if: ${{ inputs.plan != '' && !fromJson(inputs.plan).announcement_tag_is_implicit }}
    strategy:
      fail-fast: false
      matrix:
        # Mapping of base image followed by a comma followed by one or more base tags (comma separated)
        # Note, org.opencontainers.image.version label will use the first base tag (use the most specific tag first)
        image-mapping:
          - alpine:3.20,alpine3.20,alpine
          - debian:bookworm-slim,bookworm-slim,debian-slim
          - buildpack-deps:bookworm,bookworm,debian
          - python:3.12-alpine,python3.12-alpine
          - python:3.11-alpine,python3.11-alpine
          - python:3.10-alpine,python3.10-alpine
          - python:3.9-alpine,python3.9-alpine
          - python:3.8-alpine,python3.8-alpine
          - python:3.12-bookworm,python3.12-bookworm
          - python:3.11-bookworm,python3.11-bookworm
          - python:3.10-bookworm,python3.10-bookworm
          - python:3.9-bookworm,python3.9-bookworm
          - python:3.8-bookworm,python3.8-bookworm
          - python:3.12-slim-bookworm,python3.12-bookworm-slim
          - python:3.11-slim-bookworm,python3.11-bookworm-slim
          - python:3.10-slim-bookworm,python3.10-bookworm-slim
          - python:3.9-slim-bookworm,python3.9-bookworm-slim
          - python:3.8-slim-bookworm,python3.8-bookworm-slim
    steps:
      - uses: docker/setup-buildx-action@v3

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

      - name: Generate Dynamic Dockerfile Tags
        shell: bash
        run: |
          set -euo pipefail

          # Extract the image and tags from the matrix variable
          IFS=',' read -r BASE_IMAGE BASE_TAGS <<< "${{ matrix.image-mapping }}"

          # Generate Dockerfile content
          cat <<EOF > Dockerfile
          FROM ${BASE_IMAGE}
          COPY --from=${{ env.UV_BASE_IMG }}:latest /uv /usr/local/bin/uv
          COPY --from=${{ env.UV_BASE_IMG }}:latest /uvx /usr/local/bin/uvx
          ENTRYPOINT []
          CMD ["/usr/local/bin/uv"]
          EOF

          # Initialize a variable to store all tag docker metadata patterns
          TAG_PATTERNS=""

          # Loop through all base tags and append its docker metadata pattern to the list
          # Order is on purpose such that the label org.opencontainers.image.version has the first pattern with the full version
          IFS=','; for TAG in ${BASE_TAGS}; do
            TAG_PATTERNS="${TAG_PATTERNS}type=pep440,pattern={{ version }},suffix=-${TAG},value=${{ fromJson(inputs.plan).announcement_tag }}\n"
            TAG_PATTERNS="${TAG_PATTERNS}type=pep440,pattern={{ major }}.{{ minor }},suffix=-${TAG},value=${{ fromJson(inputs.plan).announcement_tag }}\n"
            TAG_PATTERNS="${TAG_PATTERNS}type=raw,value=${TAG}\n"
          done

          # Remove the trailing newline from the pattern list
          TAG_PATTERNS="${TAG_PATTERNS%\\n}"

          # Export image cache name
          echo "IMAGE_REF=${BASE_IMAGE//:/-}" >> $GITHUB_ENV

          # Export tag patterns using the multiline env var syntax
          {
            echo "TAG_PATTERNS<<EOF"
            echo -e "${TAG_PATTERNS}"
            echo EOF
          } >> $GITHUB_ENV

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.UV_BASE_IMG }}
          flavor: |
            latest=false
          tags: |
            ${{ env.TAG_PATTERNS }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          # We do not really need to cache here as the Dockerfile is tiny
          #cache-from: type=gha,scope=uv-${{ env.IMAGE_REF }}
          #cache-to: type=gha,mode=min,scope=uv-${{ env.IMAGE_REF }}
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}