{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixpkgs-carbon.url = "github:clerie/nixpkgs/clerie/always-setup-netdevs";
    # for etesync-dav
    nixpkgs-0dc1c7.url = "github:NixOS/nixpkgs/0dc1c7294c13f5d1dd6eccab4f75d268d7296efe";
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
    berlinerbaeder-exporter = {
      url = "git+https://git.clerie.de/clerie/berlinerbaeder-exporter.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    bij = {
      url = "git+https://git.clerie.de/clerie/bij.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    chaosevents = {
      url = "git+https://git.clerie.de/clerie/chaosevents.git";
      #inputs.nixpkgs.follows = "nixpkgs";
    };
    fernglas = {
      url = "github:wobcom/fernglas";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    harmonia = {
      url = "github:nix-community/harmonia/harmonia-v2.0.1";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    hydra = {
      url = "git+https://git.lix.systems/lix-project/hydra.git?ref=lix-2.93";
      #inputs.lix.follows = "lix";
      #inputs.nixpkgs.follows = "nixpkgs";
    };
    lix = {
      url = "git+https://git.lix.systems/lix-project/lix.git?ref=release-2.93";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    lix-module = {
      url = "git+https://git.lix.systems/lix-project/nixos-module.git?ref=release-2.93";
      inputs.lix.follows = "lix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    fieldpoc.url = "git+https://git.clerie.de/clerie/fieldpoc.git";
    nixos-exporter = {
      url = "git+https://git.clerie.de/clerie/nixos-exporter.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nurausstieg = {
      url = "git+https://git.clerie.de/clerie/nurausstieg.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    rainbowrss = {
      url = "git+https://git.clerie.de/clerie/rainbowrss.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    scan-to-gpg = {
      url = "git+https://git.clerie.de/clerie/scan-to-gpg.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    solid-xmpp-alarm = {
      url = "git+https://git.clerie.de/clerie/solid-xmpp-alarm.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    ssh-to-age = {
      url = "github:Mic92/ssh-to-age";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    traveldrafter = {
      url = "git+https://git.clerie.de/clerie/traveldrafter.git";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };
  outputs = { self, nixpkgs, nixos-hardware, chaosevents, fernglas, nixos-exporter, solid-xmpp-alarm, ssh-to-age, ... }@inputs: let
    lib = import ./lib inputs;
  in {
    clerie.hosts = {
      aluminium = {
        group = "event";
      };
      astatine = {
        group = "event";
        modules = [
          ./users/criese-nethinks
          ./users/isa
        ];
      };
      backup-4 = {};
      beryllium = {
        group = "event";
      };
      carbon = {};
      clerie-backup = {};
      dn42-il-gw1 = {};
      dn42-il-gw5 = {};
      dn42-il-gw6 = {};
      dn42-ildix-clerie = {};
      dn42-ildix-service = {};
      gatekeeper = {};
      hydra-1 = {};
      hydra-2 = {};
      krypton = {
        modules = [
          nixos-hardware.nixosModules.lenovo-thinkpad-x270
        ];
      };
      mail-2 = {};
      monitoring-3 = {};
      nonat = {};
      osmium = {};
      palladium = {};
      porter = {};
      storage-2 = {
        modules = [
          ./users/frank
        ];
      };
      tungsten = {};
      web-2 = {};
      zinc = {
        modules = [
          nixos-hardware.nixosModules.common-cpu-intel
        ];
      };
      # nixfiles-auto-install: add new host above
      _iso = {};
    };

    nixosConfigurations = import ./flake/nixosConfigurations.nix inputs;

    nixosModules = {
      nixfilesInputs = import ./flake/modules.nix inputs;
      clerie = import ./modules;
      profiles = import ./profiles;
      default = self.nixosModules.clerie;
    };

    overlays = {
      clerie-inputs = import ./flake/inputs-overlay.nix inputs;
      clerie-pkgs = import ./pkgs/overlay.nix;
      clerie-build-support = import ./pkgs/build-support/overlay.nix;
      clerie-overrides = import ./pkgs/overrides/overlay.nix;
    };

    nixpkgs = nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-linux" ] (system:
      lib.mkNixpkgs {
        inherit system;
      }
    );

    packages = nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-linux" ] (system:
      nixpkgs.lib.genAttrs (
        (builtins.attrNames (self.overlays.clerie-pkgs null null))
        ++ (builtins.attrNames (self.overlays.clerie-overrides null null))
      ) (name: self.nixpkgs."${system}"."${name}")
    );

    inherit lib self;

    hydraJobs = import ./flake/hydraJobs.nix inputs;

    nixConfig = {
      extra-substituters = [
        "https://nix-cache.clerie.de"
      ];
      extra-trusted-public-keys = [
        "nix-cache.clerie.de:bAt1GJTS9BOTcXFWj3nURrSlcjqikCev9yDvqArMP5g="
      ];
    };
  };
}