Revert "remove dead code"

This reverts commit 9b8e736.

Author: aignas

python/private/pypi/config.bzl.tmpl.bzlmod

@@ -0,0 +1,9 @@
+"""Extra configuration values that are exposed from the hub repository for spoke repositories to access.
+
+NOTE: This is internal `rules_python` API and if you would like to depend on it, please raise an issue
+with your usecase. This may change in between rules_python versions without any notice.
+
+@generated by rules_python pip.parse bzlmod extension.
+"""
+
+target_platforms = %%TARGET_PLATFORMS%%

python/private/pypi/hub_repository.bzl

@@ -45,6 +45,13 @@ def _impl(rctx):
     macro_tmpl = "@@{name}//{{}}:{{}}".format(name = rctx.attr.name)
 
     rctx.file("BUILD.bazel", _BUILD_FILE_CONTENTS)
+    rctx.template(
+        "config.bzl",
+        rctx.attr._config_template,
+        substitutions = {
+            "%%TARGET_PLATFORMS%%": render.list(rctx.attr.target_platforms),
+        },
+    )
     rctx.template("requirements.bzl", rctx.attr._requirements_bzl_template, substitutions = {
         "%%ALL_DATA_REQUIREMENTS%%": render.list([
             macro_tmpl.format(p, "data")
@@ -91,6 +98,9 @@ The wheel map where values are json.encoded strings of the whl_map constructed
 in the pip.parse tag class.
 """,
         ),
+        "_config_template": attr.label(
+            default = ":config.bzl.tmpl.bzlmod",
+        ),
         "_requirements_bzl_template": attr.label(
             default = ":requirements.bzl.tmpl.bzlmod",
         ),