{
  # see https://nixops.readthedocs.io/en/latest/guides/deploy-without-root.html
  description = "Satnogs Deployment Flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/23.11";
    agenix.url = "github:ryantm/agenix";
    satnogs-client-docker.url = "git+ssh://git@git.zenerdio.de/sebastian/satnogs-client-docker-flake.git";
  };

  outputs = { self, nixpkgs, agenix, satnogs-client-docker, ... }:
    let
      pkgs = nixpkgs.legacyPackages.x86_64-linux;
    in
    {

      formatter.x86_64-linux = pkgs.nixpkgs-fmt;

      devShells.x86_64-linux.default = pkgs.mkShell {
        buildInputs = with pkgs; [
          colmena
          agenix.packages.x86_64-linux.default
        ];
      };

      colmena = {
        meta = {
          nixpkgs = import nixpkgs {
            system = "x86_64-linux";
          };
        };



        defaults = { config, pkgs, ... }: {
          imports = [
            ./modules/users.nix
            ./modules/ssh.nix
            ./modules/locale.nix
            agenix.nixosModules.default
          ];
        };

        dl1ssk = { config, pkgs, ... }:
          {
            deployment = {
              tags = [ "satnogs" ];
              targetHost = "192.168.42.22";
            };

            imports = [
              ./modules/common-packages.nix
              ./machines/dl1ssk/configuration.nix
              satnogs-client-docker.nixosModules.default
            ];
          };
      };



      nixosConfigurations.rpi4_bootstrap = nixpkgs.lib.nixosSystem {
        modules = [
          "${nixpkgs}/nixos/modules/installer/sd-card/sd-image-aarch64.nix"
          {
            imports = [
              ./modules/rpi.nix
              ./modules/common-packages.nix
              ./modules/locale.nix
              ./modules/ssh.nix
              ./modules/users.nix
            ];


            networking.firewall.enable = false;

            system.stateVersion = "23.11";
          }
        ];
      };


      images.rpi4_bootstrap = self.nixosConfigurations.rpi4_bootstrap.config.system.build.sdImage;
    };
}