{
  description = "personal NixOS configurations";

  inputs = {
    # Nixpkgs, NixOS's official repo
    nixpkgs.url = "github:nixos/nixpkgs/release-22.05";

    futils.url = "github:numtide/flake-utils";

    # We use the unstable nixpkgs repo for some packages.
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixpkgs-unstable";

    emacs-overlay.url = "github:nix-community/emacs-overlay";

    agenix = {
      url = "github:ryantm/agenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    nur.url = "github:nix-community/NUR";

    home-manager = {
      url = "github:nix-community/home-manager/release-22.05";
      # We want home-manager to use the same set of nixpkgs as our system.
      inputs.nixpkgs.follows = "nixpkgs";
    };

    rust = {
      url = "github:oxalica/rust-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    pre-commit-hooks = {
      type = "github";
      owner = "cachix";
      repo = "pre-commit-hooks.nix";
      ref = "master";
      inputs = {
        flake-utils.follows = "futils";
        nixpkgs.follows = "nixpkgs";
      };
    };
  };

  # Output config, or config for NixOS system
  outputs = { self, ... }@inputs:
    let
      inherit (inputs.futils.lib) eachSystem system;
      mySystems = [
        system.x86_64-linux
      ];
      eachMySystem = eachSystem mySystems;
      lib = import ./nix { inherit inputs; };
    in
    eachMySystem
      (system:
        let
          pkgs = import inputs.nixpkgs { inherit system; };
          home-manager = inputs.home-manager.defaultPackage."${system}";
          pre-commit-golang = pkgs.callPackage
            ({ stdenv, fetchFromGitHub }:
              stdenv.mkDerivation rec {
                pname = "pre-commit-golang";
                version = "0.5.0-96221dc";
                src = fetchFromGitHub {
                  owner = "dnephin";
                  repo = pname;
                  rev = "96221dc741cb30cc0136999083dc6bd0e2113000";
                  sha256 = "sha256-lIQBoT+UIlVGnFaaGBgXag0Lm1UhGj/pIGlCCz91L4I=";
                };
                dontBuild = true;
                dontConfigure = true;
                installPhase = ''
                  runHook preInstall
                  install -d $out
                  find . -type f -name 'run-*.sh' \
                  | sed -E 's:^\./run-(.*)\.sh:\1:' \
                  | xargs -I {} install ./run-{}.sh $out/{}
                  runHook postInstall
                '';
              })
            { };
          pre-commit-golang-hook = name: {
            "${name}" = {
              inherit name;
              enable = true;
              entry = "${pre-commit-golang}/${name}";
              files = "\\.go$";
            };
          };
        in
        rec
        {
          packages = pkgs // {
            inherit home-manager;

            tools = import ./tools { inherit pkgs; };
            ops = import ./ops { inherit pkgs; };
            users.fcuny = import ./users/fcuny { inherit pkgs; };
          };

          checks = {
            pre-commit = inputs.pre-commit-hooks.lib.${system}.run {
              src = ./.;

              hooks = {
                trailing-whitespace = {
                  enable = true;
                  entry = "${pkgs.python3Packages.pre-commit-hooks}/bin/trailing-whitespace-fixer";
                  types = [ "text" ];
                };

                end-of-file-fixer = {
                  enable = true;
                  entry = "${pkgs.python3Packages.pre-commit-hooks}/bin/end-of-file-fixer";
                  types = [ "text" ];
                };

                nixpkgs-fmt = {
                  enable = true;
                };

                terraform-format = {
                  enable = true;
                };

                shellcheck = {
                  enable = true;
                  files = "\\.sh$";
                  types_or = [ "file" ];
                };
              }
              // (pre-commit-golang-hook "go-fmt")
              // (pre-commit-golang-hook "go-mod-tidy");
            };
          };

          devShells = {
            default = pkgs.mkShell {
              name = "NixOS-config";
              buildInputs = with pkgs; [
                gitAndTools.pre-commit
                nixUnstable
                nixfmt
                nixpkgs-fmt
                rnix-lsp
                home-manager
                git
                go
                gopls
              ];
              inherit (self.checks.${system}.pre-commit) shellHook;
            };
          };
        }) // {
      nixosConfigurations = {
        carmel = lib.mkSystem { hostname = "carmel"; };
        aptos = lib.mkSystem { hostname = "aptos"; };
        tahoe = lib.mkSystem { hostname = "tahoe"; };
      };
    };
}