fix(pip): simply extract whl contents to the current directory (#3549)

Before we would try to get the whl path and extract to the sibling
directory. Whilst this is not failing right now, technically this is not
the best behaviour because the whl itself may come from elsewhere. This
PR is simplifying code to see if it helps solve an issue on Windows.

Fixes #3543

Author: aignas

CHANGELOG.md

@@ -83,6 +83,14 @@ END_UNRELEASED_TEMPLATE
   that are associated with the target's `srcs` are present.
   ([#3354](https://github.com/bazel-contrib/rules_python/issues/3354)).
 
+{#v1-8-3}
+## [1.8.3] - 2026-01-27
+
+{#v1-8-3-fixed}
+### Fixed
+* (pipstar) Fix whl extraction on Windows when bazelrc has XX flags.
+  Fixes [#3543](https://github.com/bazel-contrib/rules_python/issues/3543).
+
 {#v1-8-2}
 ## [1.8.2] - 2026-01-24
 

python/private/pypi/whl_extract.bzl

@@ -12,7 +12,7 @@ def whl_extract(rctx, *, whl_path, logger):
         whl_path: the whl path to extract.
         logger: The logger to use
     """
-    install_dir_path = whl_path.dirname.get_child("site-packages")
+    install_dir_path = rctx.path("site-packages")
     repo_utils.extract(
         rctx,
         archive = whl_path,
@@ -30,7 +30,6 @@ def whl_extract(rctx, *, whl_path, logger):
         dist_info_dir.get_child("INSTALLER"),
         "https://github.com/bazel-contrib/rules_python#pipstar",
     )
-    repo_root_dir = whl_path.dirname
 
     # Get the <prefix>.dist_info dir name
     data_dir = dist_info_dir.dirname.get_child(dist_info_dir.basename[:-len(".dist-info")] + ".data")
@@ -54,7 +53,7 @@ def whl_extract(rctx, *, whl_path, logger):
                 # The prefix does not exist in the wheel, we can continue
                 continue
 
-            for (src, dest) in merge_trees(src, repo_root_dir.get_child(dest_prefix)):
+            for (src, dest) in merge_trees(src, rctx.path(dest_prefix)):
                 logger.debug(lambda: "Renaming: {} -> {}".format(src, dest))
                 rctx.rename(src, dest)