# yanked from @fufexan
{
  flakePath ? null,
  hostnamePath ? "/etc/hostname",
  registryPath ? /etc/nix/registry.json,
}:
let
  inherit (builtins)
    getFlake
    head
    match
    currentSystem
    readFile
    pathExists
    filter
    fromJSON
    ;

  selfFlake =
    if pathExists registryPath then
      filter (it: it.from.id == "self") (fromJSON (readFile registryPath)).flakes
    else
      [ ];

  flakePath' = toString (
    if flakePath != null then
      flakePath
    else if selfFlake != [ ] then
      (head selfFlake).to.path
    else
      "/etc/nixos"
  );

  flake = if pathExists flakePath' then getFlake flakePath' else { };
  hostname =
    if pathExists hostnamePath then head (match "([a-zA-Z0-9\\-]+)\n" (readFile hostnamePath)) else "";

  nixpkgsFromInputsPath = flake.inputs.nixpkgs.outPath or "";
  nixpkgs =
    flake.pkgs.${currentSystem}.nixpkgs
      or (if nixpkgsFromInputsPath != "" then import nixpkgsFromInputsPath { } else { });

  nixpkgsOutput = removeAttrs (nixpkgs // nixpkgs.lib or { }) [
    "options"
    "config"
  ];
in
{
  inherit flake;
}
// flake
// builtins
// (flake.nixosConfigurations or { })
// flake.nixosConfigurations.${hostname} or { }
// nixpkgsOutput
// {
  getFlake = path: getFlake (toString path);
}