name: Flake checks
on: [pull_request]
env:
  USER: ci

jobs:
  Check:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository code
        uses: https://code.forgejo.org/actions/checkout@v4

      - uses: https://github.com/nixbuild/nix-quick-install-action@v27
        with:
          load_nixConfig: false
          nix_conf: |
            substituters = https://cache.nixos.org/ https://nix-community.cachix.org
            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs=
            keep-outputs = true

      - name: Calculate flake.lock hash
        id: flake-lock-hash
        run: |
          echo "hash=$(md5sum flake.lock | awk '{print $1}')" >> $GITHUB_OUTPUT

      - name: Restore and cache Nix store
        uses: https://github.com/nix-community/cache-nix-action@v5
        id: nix-store-cache
        with:
          primary-key: cache-${{ runner.os }}-nix-store-${{ steps.flake-lock-hash.outputs.hash }}
          restore-prefixes-first-match: |
            cache-${{ runner.os }}-nix-store-

          gc-linux: true
          gc-max-store-size-linux: 10000000000

          purge: true
          purge-prefixes: cache-${{ runner.os }}-nix-store-
          purge-created: 42
          purge-primary-key: never

      - name: Prepare cachix
        uses: https://github.com/cachix/cachix-action@v14
        with:
          name: pub-solar
          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
          useDaemon: false

      - name: Run flake checks
        run: |
          nix --print-build-logs --verbose --accept-flake-config --access-tokens '' flake check