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

(cherry picked from commit abe2699)

Author: aignas

CHANGELOG.md

@@ -47,6 +47,14 @@ BEGIN_UNRELEASED_TEMPLATE
 END_UNRELEASED_TEMPLATE
 -->
 
+{#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)