{
  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
    nixpkgs-stable.url = "nixpkgs/nixos-23.05";

    home-manager = {
      url = "github:nix-community/home-manager/master";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    impermanence.url = "github:nix-community/impermanence";
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
  };

  outputs =
    { self
    , nixpkgs
    , nixpkgs-stable
    , nixos-hardware
    , home-manager
    , impermanence
    }@inputs:
    let
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages.${system};
    in
    {
      nixosConfigurations = {
        trantor = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            # unstablePkgs = nixpkgs-unstable.legacyPackages."x86_64-linux";
            stablePkgs = nixpkgs-stable.legacyPackages."x86_64-linux";
            impermanence = impermanence;
          };

          modules = [
            ./nixos/hosts/trantor
            home-manager.nixosModules.home-manager
            impermanence.nixosModules.impermanence
          ];
        };

        capibara = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            # unstablePkgs = nixpkgs-unstable.legacyPackages."x86_64-linux";
            stablePkgs = nixpkgs-stable.legacyPackages."x86_64-linux";
            impermanence = impermanence;
          };

          modules = [
            ./nixos/hosts/capibara
            nixos-hardware.nixosModules.lenovo-thinkpad-x230
            home-manager.nixosModules.home-manager
            impermanence.nixosModules.impermanence
          ];
        };
      };

      homeConfigurations = {
        "rilla@echidna" = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;
          modules = [ ./home/hosts/echidna.nix ];
        };
      };
    };
}