name: Pull Request
permissions:
  pull-requests: write
on:
  pull_request:
    paths:
      - .github/workflows/**
      - "**.nix"
      - "flake.lock"

jobs:
  build:
    if: github.event.pull_request.draft == false
    name: "Build ${{ matrix.target }}"
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - os: ubuntu-latest
            target: citadel
          - os: ubuntu-latest
            target: rickenbacker
          - os: ubuntu-latest
            target: dns01

    steps:
      - name: Create nix mount point
        if: contains(matrix.os, 'ubuntu')
        run: sudo mkdir /nix

      - name: Maximize build space
        uses: easimon/maximize-build-space@v10
        if: contains(matrix.os, 'ubuntu')
        with:
          root-reserve-mb: 512
          swap-size-mb: 1024
          build-mount-path: "/nix"
          remove-dotnet: true
          remove-android: true
          remove-haskell: true
          remove-docker-images: true
          remove-codeql: true
          overprovision-lvm: true

      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Install nix
        uses: cachix/install-nix-action@v25
        with:
          extra_nix_config: |
            experimental-features = nix-command flakes

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

      - name: Fetch old system profile
        run: nix build github:truxnell/nix-config#top.${{ matrix.target }} -v --dry-run --log-format raw --profile ./profile

      - name: Add new system to profile
        run: |
          set -o pipefail
          nix build .#top.${{ matrix.target }} --dry-run --profile ./profile --show-trace --fallback -v --log-format raw > >(tee stdout.log) 2> >(tee /tmp/nix-build-err.log >&2)

      - name: Output build failure
        if: failure()
        run: |
          drv=$(grep "For full logs, run" /tmp/nix-build-err.log | grep -oE "/nix/store/.*.drv")
          if [ -n $drv ]; then
            nix log $drv
            echo $drv
          fi
          exit 1

      - name: Diff profile
        id: diff
        run: | 
          nix profile diff-closures --profile ./profile
          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: Scan for security issues
        id: security
        run: | 
          nix run nixpkgs/nixos-unstable#vulnix -- -w https://raw.githubusercontent.com/ckauhaus/nixos-vulnerability-roundup/master/whitelists/nixos-unstable.toml ./profile | tee /tmp/security.txt
          OUTPUT_SECURITY="$(cat /tmp/security.txt)"
          OUTPUT_SECURITY="${OUTPUT_SECURITY//'%'/'%25'}"
          OUTPUT_SECURITY="${OUTPUT_SECURITY//$'\n'/'%0A'}"
          OUTPUT_SECURITY="${OUTPUT_SECURITY//$'\r'/'%0D'}"
          echo "$OUTPUT_SECURITY"

          delimiter="$(openssl rand -hex 16)"
          echo "security<<${delimiter}" >> "${GITHUB_OUTPUT}"
          echo "$OUTPUT_SECURITY" >> "${GITHUB_OUTPUT}"
          echo "${delimiter}" >> "${GITHUB_OUTPUT}"

      - name: Comment report in pr
        uses: marocchino/sticky-pull-request-comment@v2
        if: ${{ !startswith(github.ref, 'dependabot') }}
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          header: ".#top.${{ matrix.target }}"
          message: |
            ### Report for `${{ matrix.target }}`

            <summary> Version changes </summary> <br>
            <pre> ${{ steps.diff.outputs.diff }} </pre>

            <details>
            <summary> Security vulnerability report </summary> <br>
            <pre> ${{ steps.security.outputs.security }} </pre>
            </details>

# Liberated from edeneast's github