How to build arbitrary kernel from local source tree on NixOS?

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Alright, another try, this time I am almost there. I just decided to grab the exact commit I need from the remote repo.

{
  boot.kernelPackages =
    let
      linux_pkg = { fetchgit, buildLinux, ... } @ args:

        buildLinux (args // rec {
          version = "5.16.9";
          modDirVersion = version;

          src = fetchgit
            {
              url = "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/";
              rev = "91fc147";
              sha256 = "Dz+CpecLcVU/jA00gCnOenDhL8yYzMxM58uCXcTtzj0=";
            };

          kernelPatches = [ ];

          extraMeta.branch = "5.16";
        } // (args.argsOverride or { }));
      linux_5-16-9 = pkgs.callPackage linux_pkg { };
    in
    pkgs.recurseIntoAttrs (pkgs.linuxPackagesFor linux_5-16-9);
}

But now the build itself fails. Which is another problem entirely and I will open a new thread for this one I guess. But getting the right sources works now. Even though fetchgit did not want to fetch my local source tree for whatever reason…