{
  description = "Photo services test vm";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    colmena = {
      url = "github:zhaofengli/colmena";
      inputs = {
        flake-utils.follows = "flake-utils";
        nixpkgs.follows = "nixpkgs";
        stable.follows = "nixpkgs";
      };
    };
    flake-utils.url = "github:numtide/flake-utils";
    disko = {
      url = "github:nix-community/disko";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, flake-utils, colmena, disko, ... }@inputs:
    let lib = nixpkgs.lib;
    in {

      nixosConfigurations = builtins.mapAttrs (name: value:
        nixpkgs.lib.nixosSystem {
          lib = lib;
          system = "x86_64-linux";
          specialArgs = { inherit inputs; };
          modules = [ value disko.nixosModules.disko ];
          extraModules = [ inputs.colmena.nixosModules.deploymentOptions ];
        }) { photoprism = import ./configuration.nix; };

      colmena = {
        meta = {
          nixpkgs = import inputs.nixpkgs { system = "x86_64-linux"; };
          nodeSpecialArgs = builtins.mapAttrs (_: v: v._module.specialArgs)
            self.nixosConfigurations;
          specialArgs.lib = lib;
        };
      } // builtins.mapAttrs (_: v: { imports = v._module.args.modules; })
        self.nixosConfigurations;
    } // flake-utils.lib.eachDefaultSystem (system:
      let pkgs = nixpkgs.legacyPackages.${system};
      in {
        devShell = pkgs.mkShell {
          buildInputs = [ colmena.packages.${system}.colmena ];
        };
      });
}