fetchurl: restructure with lib.extendMkDerivation (not formatted)

in

lib.extendMkDerivation {

  constructDrv = stdenvNoCC.mkDerivation;

  excludeDrvArgNames = [

    # Passed via passthru

    "url"

    # Name-related attributes

    # TODO(@ShamrockLee): Pass them.

    "name"

    "pname"

    "version"

    # Hash attributes will be map to the corresponding outputHash*

    "hash"

    "sha1"

    "sha256"

    "sha512"

  ];

  extendDrvArgs =

    finalAttrs:

{

  # URL to fetch.

  url ? "",

      "${lib.head mirrorList}${lib.elemAt mirrorSplit 1}";

in

stdenvNoCC.mkDerivation (

  (

    if (pname != "" && version != "") then

      { inherit pname version; }

      inherit url resolvedUrl;

    }

    // passthru;

  };

  # No ellipsis

  inheritFunctionArgs = false;

}

)