{
  inputs = {
    nixpkgs = {
      # --- Official
      type = "github";
      owner = "NixOS";
      repo = "nixpkgs";
      ref = "master";
      # --- Fork
      # type = "github";
      # owner = "karaolidis";
      # repo = "nixpkgs";
      # ref = "integration";
      # --- Local
      # url = "git+file:./submodules/nixpkgs";
    };

    home-manager = {
      # --- Official
      # type = "github";
      # owner = "nix-community"
      # repo = "home-manager";
      # --- Fork
      type = "github";
      owner = "karaolidis";
      repo = "home-manager";
      ref = "integration";
      # --- Local
      # url = "git+file:./submodules/home-manager";

      inputs.nixpkgs.follows = "nixpkgs";
    };

    impermanence = {
      # --- Official
      # type = "github";
      # owner = "nix-community"
      # repo = "impermanence";
      # --- Fork
      type = "github";
      owner = "karaolidis";
      repo = "impermanence";
      ref = "integration";
      # --- Local
      # url = "git+file:./submodules/impermanence";
    };

    disko = {
      url = "github:nix-community/disko";
      inputs.nixpkgs.follows = "nixpkgs";
    };

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

    nur = {
      url = "github:nix-community/NUR";
    };

    ags = {
      url = "github:Aylur/ags";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    { self, nixpkgs, ... }@inputs:
    {
      nixosConfigurations = {
        eirene-vm = nixpkgs.lib.nixosSystem {
          specialArgs = {
            inherit inputs;
          };
          system = "x86_64-linux";
          modules = [ ./hosts/eirene/vm ];
        };

        eirene = nixpkgs.lib.nixosSystem {
          specialArgs = {
            inherit inputs;
          };
          system = "x86_64-linux";
          modules = [ ./hosts/eirene/base ];
        };
      };

      formatter.x86_64-linux = nixpkgs.legacyPackages.x86_64-linux.nixfmt-rfc-style;
    };
}