{
  inputs = {
    nixops4.follows = "nixops4-nixos/nixops4";
    nixops4-nixos.url = "github:nixops4/nixops4-nixos";
  };

  outputs =
    inputs:
    import ./mkFlake.nix inputs (
      { inputs, sources, ... }:
      {
        imports = [
          "${sources.git-hooks}/flake-module.nix"
          inputs.nixops4.modules.flake.default

          ./deployment/flake-part.nix
          ./infra/flake-part.nix
          ./keys/flake-part.nix
          ./secrets/flake-part.nix
          ./services/tests/flake-part.nix
        ];

        perSystem =
          {
            pkgs,
            lib,
            system,
            ...
          }:
          {
            checks = {
              panel = (import ./. { inherit sources system; }).tests.panel.basic;
            };
            formatter = pkgs.nixfmt-rfc-style;

            pre-commit.settings.hooks =
              let
                ## Add a directory here if pre-commit hooks shouldn't apply to it.
                optout = [ "npins" ];
                excludes = map (dir: "^${dir}/") optout;
                addExcludes = lib.mapAttrs (_: c: c // { inherit excludes; });
              in
              addExcludes {
                nixfmt-rfc-style.enable = true;
                deadnix.enable = true;
                trim-trailing-whitespace.enable = true;
                shellcheck.enable = true;
              };
          };
      }
    );
}