{
  description = "Lanzaboot Secure Boot Madness";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
    nixpkgs-test.url = "github:RaitoBezarius/nixpkgs/simplified-qemu-boot-disks";

    flake-parts.url = "github:hercules-ci/flake-parts";

    # We only have this input to pass it to other dependencies and
    # avoid having mulitple versions in our dependencies.
    flake-utils.url = "github:numtide/flake-utils";

    crane = {
      url = "github:ipetkov/crane";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.rust-overlay.follows = "rust-overlay";
      inputs.flake-utils.follows = "flake-utils";
    };

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

    flake-compat = {
      url = "github:edolstra/flake-compat";
      flake = false;
    };
  };

  outputs = inputs@{ self, nixpkgs, nixpkgs-test, crane, rust-overlay, flake-parts, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      flake = let
        pkgs = import nixpkgs {
          system = "x86_64-linux";
          overlays = [
            rust-overlay.overlays.default
          ];
        };

        testPkgs = import nixpkgs-test { system = "x86_64-linux"; };

        inherit (pkgs) lib;

        rust-nightly = pkgs.rust-bin.fromRustupToolchainFile ./rust/lanzaboote/rust-toolchain.toml;
        craneLib = crane.lib.x86_64-linux.overrideToolchain rust-nightly;

        uefi-run = pkgs.callPackage ./nix/packages/uefi-run.nix {
          inherit craneLib;
        };

        # Build attributes for a Rust application.
        buildRustApp =
          { src
          , target ? null
          , doCheck ? true
          , extraArgs ? { }
          }:
          let
            commonArgs = {
              inherit src;
              CARGO_BUILD_TARGET = target;
              inherit doCheck;
            } // extraArgs;

            cargoArtifacts = craneLib.buildDepsOnly commonArgs;
          in
            {
              package = craneLib.buildPackage (commonArgs // {
                inherit cargoArtifacts;
              });

              clippy = craneLib.cargoClippy (commonArgs // {
                inherit cargoArtifacts;
                cargoClippyExtraArgs = "-- --deny warnings";
              });
            };

        lanzabooteCrane = buildRustApp {
          src = craneLib.cleanCargoSource ./rust/lanzaboote;
          target = "x86_64-unknown-uefi";
          doCheck = false;
        };

        lanzaboote = lanzabooteCrane.package;

        lanzatoolCrane = buildRustApp {
          src = ./rust/lanzatool;
          extraArgs = {
            TEST_SYSTEMD = pkgs.systemd;
            checkInputs = with pkgs; [
              binutils-unwrapped
              sbsigntool
            ];
          };
        };

        lanzatool-unwrapped = lanzatoolCrane.package;

        lanzatool = pkgs.runCommand "lanzatool"
          {
            nativeBuildInputs = [ pkgs.makeWrapper ];
          } ''
        mkdir -p $out/bin

        # Clean PATH to only contain what we need to do objcopy. Also
        # tell lanzatool where to find our UEFI binaries.
        makeWrapper ${lanzatool-unwrapped}/bin/lanzatool $out/bin/lanzatool \
          --set PATH ${lib.makeBinPath [ pkgs.binutils-unwrapped pkgs.sbsigntool ]} \
          --set RUST_BACKTRACE full \
          --set LANZABOOTE_STUB ${lanzaboote}/bin/lanzaboote.efi
      '';
      in
        {
          overlays.default = final: prev: {
            inherit lanzatool;
          };

          nixosModules.lanzaboote = { pkgs, lib, ... }: {
            imports = [ ./nix/modules/lanzaboote.nix ];
            boot.lanzaboote.package = lib.mkDefault self.packages.${pkgs.system}.lanzatool;
          };

          packages.x86_64-linux = {
            inherit lanzaboote lanzatool;
            default = lanzatool;
          };

          devShells.x86_64-linux.default = pkgs.mkShell {
            packages = [
              uefi-run
              pkgs.openssl
              (pkgs.sbctl.override {
                databasePath = "pki";
              })
              pkgs.sbsigntool
              pkgs.efitools
              pkgs.python39Packages.ovmfvartool
              pkgs.qemu
              pkgs.nixpkgs-fmt
              pkgs.statix
            ];

            inputsFrom = [
              lanzaboote
              lanzatool
            ];

            TEST_SYSTEMD = pkgs.systemd;
          };

          checks.x86_64-linux = {
            lanzatool-clippy = lanzatoolCrane.clippy;
            lanzaboote-clippy = lanzabooteCrane.clippy;
          } // (import ./nix/tests/lanzaboote.nix {
            inherit pkgs testPkgs;
            lanzabooteModule = self.nixosModules.lanzaboote;
          });
        };

      systems = [
        "x86_64-linux"
      ];

      perSystem = { config, ... }: {
        # Nothing here yet.
      };
    };
}