Docs: Add changelog entry for local_runtime_repo include dir fix

References issue #3043.

Author: google-labs-jules[bot]

CHANGELOG.md

@@ -69,6 +69,9 @@ END_UNRELEASED_TEMPLATE
 * (pypi) Wheels with BUILD.bazel (or other special Bazel files) no longer
   result in missing files at runtime
   ([#2782](https://github.com/bazel-contrib/rules_python/issues/2782)).
+* (toolchains) `local_runtime_repo` now checks if the include directory exists
+  before attempting to watch it, fixing issues on macOS with system Python
+  ({gh-issue}`3043`).
 
 {#v0-0-0-added}
 ### Added

python/private/local_runtime_repo.bzl

@@ -100,13 +100,12 @@ def _local_runtime_repo_impl(rctx):
 
     # NOTE: Keep in sync with recursive glob in define_local_runtime_toolchain_impl
     include_path = rctx.path(info["include"])
-
-    # The reported include path may not exist, and watching a non-existant
-    # path is an error. Silently skip, since includes are only necessary
-    # if C extensions are built.
     if include_path.exists and include_path.is_dir:
         repo_utils.watch_tree(rctx, include_path)
     else:
+        # If the path doesn't exist or is not a directory, do not watch it.
+        # This handles the case where the include path specified in Python metadata
+        # is invalid or points to a file.
         pass
 
     # The cc_library.includes values have to be non-absolute paths, otherwise