name: Guix Build

permissions:
  packages: write
  id-token: write
  attestations: write

on:
  pull_request_target:
  push:

jobs:
  build-image:
    runs-on: ubuntu-latest
    outputs:
      image-tag: ${{ steps.prepare.outputs.image-tag }}
      repo-name: ${{ steps.prepare.outputs.repo-name }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          path: dash
          fetch-depth: 0

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

      - name: Commit variables
        id: prepare
        run: |
          echo "hash=$(sha256sum ./dash/contrib/containers/guix/Dockerfile | cut -d ' ' -f1)" >> $GITHUB_OUTPUT
          echo "host_user_id=$(id -u)" >> $GITHUB_OUTPUT
          echo "host_group_id=$(id -g)" >> $GITHUB_OUTPUT
          BRANCH_NAME=$(echo "${GITHUB_REF##*/}" | tr '[:upper:]' '[:lower:]')
          REPO_NAME=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
          echo "image-tag=${BRANCH_NAME}" >> $GITHUB_OUTPUT
          echo "repo-name=${REPO_NAME}" >> $GITHUB_OUTPUT

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build Docker image
        uses: docker/build-push-action@v6
        with:
          context: ${{ github.workspace }}/dash
          build-args: |
            USER_ID=${{ steps.prepare.outputs.host_user_id }}
            GROUP_ID=${{ steps.prepare.outputs.host_group_id }}
          build-contexts: |
            docker_root=${{ github.workspace }}/dash/contrib/containers/guix
          file: ./dash/contrib/containers/guix/Dockerfile
          push: true
          tags: |
            ghcr.io/${{ steps.prepare.outputs.repo-name }}/dashcore-guix-builder:${{ steps.prepare.outputs.image-tag }}
            ghcr.io/${{ steps.prepare.outputs.repo-name }}/dashcore-guix-builder:latest
          cache-from: type=registry,ref=ghcr.io/${{ steps.prepare.outputs.repo-name }}/dashcore-guix-builder:latest
          cache-to: type=inline,mode=max

  build:
    needs: build-image
    # runs-on: [ "self-hosted", "linux", "x64", "ubuntu-core" ]
    runs-on: ubuntu-latest
#    if: ${{ contains(github.event.pull_request.labels.*.name, 'guix-build') }}
    strategy:
      matrix:
        build_target: [x86_64-linux-gnu, arm-linux-gnueabihf, aarch64-linux-gnu, riscv64-linux-gnu, x86_64-w64-mingw32, x86_64-apple-darwin, arm64-apple-darwin]

    timeout-minutes: 480
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          path: dash
          fetch-depth: 0

      - name: Cache Guix and depends
        id: guix-cache-restore
        uses: actions/cache@v3
        with:
          path: |
            ${{ github.workspace }}/.cache
            ${{ github.workspace }}/dash/depends/built
            ${{ github.workspace }}/dash/depends/sources
            ${{ github.workspace }}/dash/depends/work
            /gnu/store
          key: ${{ runner.os }}-guix-${{ matrix.build_target }}-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-guix-${{ matrix.build_target }}
            ${{ runner.os }}-guix-

      - name: Create .cache folder if missing
        if: steps.guix-cache-restore.outputs.cache-hit != 'true'
        run: mkdir -p .cache

      - name: Run Guix build
        timeout-minutes: 480
        run: |
          docker run --privileged -d --rm -t \
            --name guix-daemon \
            -e ADDITIONAL_GUIX_COMMON_FLAGS="--max-jobs=$(nproc --all)" \
            -v ${{ github.workspace }}/dash:/src/dash \
            -v ${{ github.workspace }}/.cache:/home/ubuntu/.cache \
            -w /src/dash \
            ghcr.io/${{ needs.build-image.outputs.repo-name }}/dashcore-guix-builder:${{ needs.build-image.outputs.image-tag }} && \
          docker exec guix-daemon bash -c 'HOSTS=${{ matrix.build_target }} /usr/local/bin/guix-start'

      - name: Ensure build passes
        run: |
          if [[ $? != 0 ]]; then
            echo "Guix build failed!"
            exit 1
          fi

      - name: Compute SHA256 checksums
        continue-on-error: true # It will complain on depending on only some hosts
        run: |
          HOSTS=${{ matrix.build_target }} ./dash/contrib/containers/guix/scripts/guix-check ${{ github.workspace }}/dash

      - name: Upload build artifacts
        uses: actions/upload-artifact@v4
        with:
          name: guix-artifacts-${{ matrix.build_target }}
          path: |
            ${{ github.workspace }}/dash/guix-build*/output/${{ matrix.build_target }}/

      - name: Attest build provenance
        uses: actions/attest-build-provenance@v1
        with:
          subject-path: ${{ github.workspace }}/dash/guix-build*/output/${{ matrix.build_target }}/*