name: Docker

on:
  release:
    types: [published]
  workflow_dispatch:
    inputs:
      version:
        description: "pnpm version to build (without leading v)"
        required: true
      prerelease:
        description: "Treat as prerelease (skips mutable tags)"
        type: boolean
        default: false

jobs:
  build:
    name: Build
    if: github.event_name == 'workflow_dispatch' || startsWith(github.event.release.tag_name, 'v')
    runs-on: blacksmith-8vcpu-ubuntu-2404
    environment: release
    permissions:
      contents: read
      packages: write
      id-token: write
    env:
      IMAGE: ghcr.io/${{ github.repository_owner }}/pnpm
    steps:
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      - name: Resolve release metadata
        id: meta
        env:
          EVENT_NAME: ${{ github.event_name }}
          RELEASE_TAG: ${{ github.event.release.tag_name }}
          RELEASE_PRERELEASE: ${{ github.event.release.prerelease }}
          INPUT_VERSION: ${{ inputs.version }}
          INPUT_PRERELEASE: ${{ inputs.prerelease }}
        run: |
          set -eu
          if [ "$EVENT_NAME" = "release" ]; then
            version="${RELEASE_TAG#v}"
            prerelease="$RELEASE_PRERELEASE"
          else
            version="${INPUT_VERSION#v}"
            prerelease="$INPUT_PRERELEASE"
          fi
          case "$version" in
            *[!0-9A-Za-z.+-]*) echo "invalid version: $version" >&2; exit 1 ;;
            [0-9]*.[0-9]*.[0-9]*) ;;
            *) echo "invalid version: $version" >&2; exit 1 ;;
          esac
          echo "version=$version" >> "$GITHUB_OUTPUT"
          echo "prerelease=$prerelease" >> "$GITHUB_OUTPUT"

      - name: Compute pnpm tarball checksums
        id: checksums
        env:
          VERSION: ${{ steps.meta.outputs.version }}
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          base="https://github.com/pnpm/pnpm/releases/download/v${VERSION}"
          for pair in amd64:x64 arm64:arm64; do
            key="${pair%:*}"
            name="${pair#*:}"
            sha="$(curl -fsSL --retry 3 --retry-delay 2 "${base}/pnpm-linux-${name}.tar.gz" \
                   | sha256sum | awk '{print $1}')"
            echo "sha_${key}=${sha}" >> "$GITHUB_OUTPUT"
          done
          # The Alpine image is built only for release lines that ship musl
          # tarballs for both architectures. Older lines lack the arm64 one.
          assets="$(gh release view "v${VERSION}" --repo "$GITHUB_REPOSITORY" --json assets --jq '.assets[].name')"
          alpine=true
          for name in x64 arm64; do
            printf '%s\n' "$assets" | grep -qxF "pnpm-linux-${name}-musl.tar.gz" || alpine=false
          done
          echo "alpine=${alpine}" >> "$GITHUB_OUTPUT"
          if [ "$alpine" = true ]; then
            for pair in amd64:x64 arm64:arm64; do
              key="${pair%:*}"
              name="${pair#*:}"
              sha="$(curl -fsSL --retry 3 --retry-delay 2 "${base}/pnpm-linux-${name}-musl.tar.gz" \
                     | sha256sum | awk '{print $1}')"
              echo "sha_musl_${key}=${sha}" >> "$GITHUB_OUTPUT"
            done
          fi

      - name: Set up QEMU
        uses: docker/setup-qemu-action@99012661954931238ded8c8b007157a8430204e1 # v4.4.0

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@f87e5991a6d7451dcb8d9637bfbc97413f497069 # v4.4.1

      - name: Login to GHCR
        uses: docker/login-action@81c6f93d4bc991e510b342a00b419b3bb4efc5c6 # v4.7.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
        with:
          context: ./docker
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ env.IMAGE }}:${{ steps.meta.outputs.version }}
          build-args: |
            PNPM_VERSION=${{ steps.meta.outputs.version }}
            PNPM_SHA256_AMD64=${{ steps.checksums.outputs.sha_amd64 }}
            PNPM_SHA256_ARM64=${{ steps.checksums.outputs.sha_arm64 }}
          provenance: mode=max
          sbom: true

      - name: Build and push Alpine
        if: steps.checksums.outputs.alpine == 'true'
        uses: docker/build-push-action@c3c9e263c25d99ce0380d002d59b67737d91b0dc # v7.4.0
        with:
          context: ./docker
          file: ./docker/Dockerfile.alpine
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ env.IMAGE }}:${{ steps.meta.outputs.version }}-alpine
          build-args: |
            PNPM_VERSION=${{ steps.meta.outputs.version }}
            PNPM_SHA256_AMD64=${{ steps.checksums.outputs.sha_musl_amd64 }}
            PNPM_SHA256_ARM64=${{ steps.checksums.outputs.sha_musl_arm64 }}
          provenance: mode=max
          sbom: true

      # Runs after the builds so that every release published in the same
      # burst is listed by the time this run decides which tags it may move.
      - name: Move mutable tags
        if: steps.meta.outputs.prerelease != 'true'
        env:
          VERSION: ${{ steps.meta.outputs.version }}
          ALPINE: ${{ steps.checksums.outputs.alpine }}
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          releases="$(gh api --paginate "repos/${GITHUB_REPOSITORY}/releases?per_page=100" \
                        --jq '.[] | select(.draft == false and .prerelease == false) | .tag_name')"
          moves="$(.github/scripts/docker-image-tags.sh "$IMAGE" "$VERSION" "$ALPINE" <<< "$releases")"
          while read -r target source; do
            [ -n "$target" ] || continue
            docker buildx imagetools create --tag "$target" "$source"
          done <<< "$moves"