wip: bzlmod workspace interop

Author: rickeylev

python/private/python.bzl

@@ -228,7 +228,11 @@ def _python_impl(module_ctx):
         kwargs.update(py.config.kwargs.get(toolchain_info.python_version, {}))
         kwargs.update(py.config.kwargs.get(full_python_version, {}))
         kwargs.update(py.config.default)
-        python_register_toolchains(name = toolchain_info.name, **kwargs)
+        python_register_toolchains(
+            name = toolchain_info.name,
+            _internal_bzlmod_toolchain_call = True,
+            **kwargs
+        )
 
     # Create the pythons_hub repo for the interpreter meta data and the
     # the various toolchains.

python/private/python_register_toolchains.bzl

@@ -75,9 +75,8 @@ def python_register_toolchains(
             version.
         **kwargs: passed to each {obj}`python_repository` call.
     """
-
-    if BZLMOD_ENABLED:
-        # you cannot used native.register_toolchains when using bzlmod.
+    bzlmod_toolchain_call = kwargs.pop("_internal_bzlmod_toolchain_call", False)
+    if bzlmod_toolchain_call:
         register_toolchains = False
 
     base_url = kwargs.pop("base_url", DEFAULT_RELEASE_BASE_URL)
@@ -169,7 +168,7 @@ def python_register_toolchains(
     )
 
     # in bzlmod we write out our own toolchain repos
-    if BZLMOD_ENABLED:
+    if bzlmod_toolchain_call:
         return
 
     toolchains_repo(