{
  description = "CCCHH Nix Infrastructure";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05";
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";

    # Add nixos-generators as an input.
    # See here: https://github.com/nix-community/nixos-generators#using-in-a-flake
    nixos-generators = {
      url = "github:nix-community/nixos-generators";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { nixpkgs, nixpkgs-unstable, nixos-generators, ... }: {
    colmena = {
      meta = {
        nixpkgs = nixpkgs.legacyPackages."x86_64-linux";
        nodeNixpkgs = {
          audio = nixpkgs-unstable.legacyPackages."x86_64-linux";
        };
      };

      audio = {
        deployment = {
          targetHost = "audio.z9.ccchh.net";
          targetPort = 22;
          targetUser = "chaos";
        };
        imports = [ 
          ./config/common
          ./config/proxmox-vm
          ./config/hosts/audio
        ];
      };
    };

    packages.x86_64-linux = {
      proxmox = nixos-generators.nixosGenerate {
        system = "x86_64-linux";
        modules = [
          ./config/nixos-generators/proxmox.nix
          ./config/common
          ./config/proxmox-vm
        ];
        format = "proxmox";
      };
    };
  };
}