fetchgit: restructure with lib.extendMkDerivation (not formatted)

in

lib.makeOverridable (

  lib.extendMkDerivation {

    constructDrv = stdenvNoCC.mkDerivation;

    excludeDrvArgNames = [

      # Passed via `passthru`

      "tag"

      # Hashes, handled by `lib.fetchers.withNormalizedHash`

      # whose outputs contain outputHash* attributes.

      "hash"

      "sha256"

    ];

    extendDrvArgs =

      finalAttrs:

  lib.fetchers.withNormalizedHash { } (

    # NOTE Please document parameter additions or changes in

    #   ../../../doc/build-helpers/fetchers.chapter.md

      throw

        "Please provide directories/patterns for sparse checkout as a list of strings. Passing a (multi-line) string is not supported any more."

    else

      stdenvNoCC.mkDerivation {

      {

        inherit name;

        builder = ./builder.sh;

        }

        // passthru;

      }

  )

  );

    # No ellipsis.

    inheritFunctionArgs = false;

  }

)