let
  sources = import ./npins;
  pkgs = import sources.nixpkgs { };
  pkgs-master = import sources.nixpkgs-master { };

  pup_lib = import ./lib {
    inherit (pkgs) lib;
    inherit pkgs;
    inherit sources;
  };

  pins = (
    pup_lib.gen_pins sources [
      "helix-nix"
      "nixpkgs"
      "dune"
    ]
  );
  root_path = toString ./.;
in
pkgs.lib.fix (self: rec {

  args = {
    inherit self;
    inherit root_path;
    inherit pins;
    inherit sources;
    inherit pup_lib;
    inherit pkgs;
    inherit pkgs-master;
  };

  hosts = {
    work = pup_lib.gen_host [ ./hosts/work/default.nix ] args;
    sand-archives = pup_lib.gen_host [ ./hosts/sand-archives/default.nix ] args;
    cave = pup_lib.gen_host [ ./hosts/cave/default.nix ] args;
    vulpes = pup_lib.gen_host [ ./hosts/vulpes/default.nix ] args;
  };
})