{
  description = "NixOS configurations";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = inputs@{ nixpkgs, sops-nix, ... }: {
    nixosConfigurations = {
      "base" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./per-host/base/configuration.nix
        ];
      };

      "caldav" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./per-host/base/configuration.nix
          ./per-host/caldav/configuration.nix
          sops-nix.nixosModules.sops
        ];
      };

      "s3" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./per-host/base/configuration.nix
          ./per-host/s3/configuration.nix
          sops-nix.nixosModules.sops
        ];
      };

      "git" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./per-host/base/configuration.nix
          ./per-host/git/configuration.nix
          sops-nix.nixosModules.sops
        ];
      };

      "torrents-2" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./per-host/base/configuration.nix
          ./per-host/torrents-2/configuration.nix
          sops-nix.nixosModules.sops
        ];
      };

      "photos" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./per-host/base/configuration.nix
          ./per-host/photos/configuration.nix
          sops-nix.nixosModules.sops
        ];
      };

      "rproxy-2" = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./per-host/base/configuration.nix
          ./per-host/rproxy-2/configuration.nix
          sops-nix.nixosModules.sops
        ];
      };
    };
  };
}