{
  description = "NixOS definitions for our physical servers";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
    deploy-rs.url = "github:serokell/deploy-rs";
  };

  outputs = { self, nixpkgs, deploy-rs, ... }:
    let
      system = "x86_64-linux";
      pkgs = import nixpkgs { inherit system; };
      deployPkgs = import nixpkgs {
        inherit system;
        overlays = [
          deploy-rs.overlay
          (self: super: {
            deploy-rs = {
              inherit (pkgs) deploy-rs;
              lib = super.deploy-rs.lib;
            };
          })
        ];
      };

    in {

      formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixfmt;

      nixosConfigurations.hypervisor = nixpkgs.lib.nixosSystem {
        inherit system;
        modules = [ ./configuration.nix ];
      };

      deploy = {
        sshUser = "root";
        user = "root";

        nodes.jefke = {
          hostname = "jefke.hyp";
          profiles.hypervisor = {
            path = deployPkgs.deploy-rs.lib.activate.nixos
              self.nixosConfigurations.hypervisor;
          };
        };
      };

      checks = builtins.mapAttrs
        (system: deployLib: deployLib.deployChecks self.deploy) deploy-rs.lib;
    };
}