Decycling the toolchain for NUR integration

[SCOTT-HAMILTON]

Hello, I'm very interested in gomod2nix because it greatly simplifies the packaging process of go modules.

I'm using a nur repo to package my personal apps and I therefore wanted to add gomod2nix.buildGoApplication to my libs. Except that gomod2nix uses overlays...

And the reason behind this is (as I understand it) because of the following cyclic dependency: gomod2nix(the binary) depends on buildGoApplication which depends on gomod2nix.

Fortunately, the last dependency link is easy to break: buildGoApplication only depends on gomod2nix for its update script.

So I've used the following structure to add buildGoApplication to my nur libs:
lib/default.nix

{ pkgs }:

with pkgs.lib; let
  builder0 = pkgs.callPackage ./gomod2nix-no-cyclic-deps/builder { };
  gomod2nix0 = pkgs.callPackage ./gomod2nix-no-cyclic-deps { inherit (builder0) buildGoApplication; };
  builder1 = pkgs.callPackage ./gomod2nix/builder { gomod2nix = gomod2nix0; };
in {
  gomod2nix = { inherit (builder1)  buildGoApplication; };
}

gomod2nix is just a clone of this repo, and gomod2nix-no-cyclic-deps is a fork with the following patch:

--- a/builder/default.nix
+++ b/builder/default.nix
@@ -10,7 +10,6 @@
 , buildPackages
 , runtimeShell
 , writeScript
-, gomod2nix
 , rsync
 }:
 let
@@ -405,26 +404,6 @@ let
 
         passthru = {
           inherit go vendorEnv;
-        } // optionalAttrs (hasAttr "goPackagePath" modulesStruct) {
-
-          updateScript =
-            let
-              generatorArgs =
-                if hasAttr "subPackages" modulesStruct
-                then
-                  concatStringsSep " "
-                    (
-                      map (subPackage: modulesStruct.goPackagePath + "/" + subPackage) modulesStruct.subPackages
-                    )
-                else modulesStruct.goPackagePath;
-
-            in
-            writeScript "${pname}-updater" ''
-              #!${runtimeShell}
-              ${optionalString (pwd != null) "cd ${toString pwd}"}
-              exec ${gomod2nix}/bin/gomod2nix generate ${generatorArgs}
-            '';
-
         } // passthru;
 
         inherit meta;

(I just deleted the updatescript).
This works but I wonder how this toolchain could be internalized into the project instead of me having to pull/rebase my patch every time it conflicts with upstream.