check-pr.yaml

name: "Build pull request"

on:
  pull_request:

permissions:
  contents: read
  pull-requests: write

jobs:
  tests:
    name: "Build ${{ matrix.target }}"
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - os: ubuntu-22.04
            target: nixosConfigurations.sandhose-desktop.config.system.build.toplevel
          - os: ubuntu-22.04
            target: nixosConfigurations.spaetzle.config.system.build.toplevel
          - os: macos-14
            target: darwinConfigurations.sandhose-laptop-m1.system

    steps:
      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@main

      - name: Setup cachix
        uses: cachix/cachix-action@v15
        with:
          name: sandhose
          skipPush: true
          extraPullNames: nix-community

      - name: Build system
        env:
          TARGET: "github:${{ github.repository }}/${{ github.ref }}#${{ matrix.target }}"
        run: nix build $TARGET --fallback --log-format raw --print-build-logs

      - name: Garbage collect build dependencies
        run: nix-collect-garbage

      - name: Fetch old system to profile
        env:
          TARGET: "github:${{ github.repository }}/${{ github.base_ref }}#${{ matrix.target }}"
        run: nix build $TARGET --log-format raw --print-build-logs --profile ./profile

      - name: Add new system to profile
        env:
          TARGET: "github:${{ github.repository }}/${{ github.ref }}#${{ matrix.target }}"
        run: nix build $TARGET --log-format raw --print-build-logs --profile ./profile

      - name: Diff profile
        id: diff
        run: |
          delimiter="$(openssl rand -hex 16)"
          echo "diff<<${delimiter}" >> "${GITHUB_OUTPUT}"
          nix profile diff-closures --profile ./profile | perl -pe 's/\e\[[0-9;]*m(?:\e\[K)?//g' >> "${GITHUB_OUTPUT}"
          echo "${delimiter}" >> "${GITHUB_OUTPUT}"

      - name: Comment PR
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          header: ".#${{ matrix.target }}"
          message: |
            ### Diff of `${{ matrix.target }}`

            ```
            ${{ steps.diff.outputs.diff }}
            ```