{
  description = "Tool to build NixOS for GCP.  ";
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    nixos-generators = {
      url = "github:nix-community/nixos-generators";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, nixos-generators }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        python = pkgs.python312.withPackages (ps: [ ps.click ]);
        gcp = nixos-generators.nixosGenerate {
          system = "x86_64-linux";

          modules = [ ./gcp-configuration.nix ];
          format = "gce";

          pkgs = nixpkgs.legacyPackages.x86_64-linux;
          lib = nixpkgs.legacyPackages.x86_64-linux.lib;
        };
      in {

        packages.gcp = gcp;
        devShells.default = pkgs.mkShell {
          buildInputs = [ pkgs.google-cloud-sdk python ];
          shellHook = ''
            export PROJECT_ID="all-dressed-programming"
            export BUCKET_NAME="nautilus-plus"
          '';
        };
      });
}