Shorten Windows wheel repositories for default path limits

Author: Trinkle23897

MODULE.bazel

@@ -19,6 +19,7 @@ single_version_override(
     module_name = "rules_python",
     patches = [
         "//third_party/rules_python:pip_repository_host_platform.patch",
+        "//third_party/rules_python:windows_short_wheel_names.patch",
         "//third_party/rules_python:zipapp_explicit_init.patch",
     ],
 )

third_party/rules_python/BUILD

@@ -14,5 +14,6 @@
 
 exports_files([
     "pip_repository_host_platform.patch",
+    "windows_short_wheel_names.patch",
     "zipapp_explicit_init.patch",
 ])

third_party/rules_python/windows_short_wheel_names.patch

@@ -0,0 +1,18 @@
+Keep hashed Windows wheel repository names below MAX_PATH. The pip hub already
+includes the Python version and the wheel digest uniquely identifies its ABI
+and platform, so those tags do not need to appear in the repository path too.
+
+--- python/private/pypi/whl_repo_name.bzl
++++ python/private/pypi/whl_repo_name.bzl
+@@ -55,9 +55,8 @@
+         platform_tag, _, _ = parsed.platform_tag.partition(".")
+ 
+         parts.append(name)
+-        parts.append(python_tag)
+-        parts.append(abi_tag)
+-        parts.append(platform_tag)
++        if not (digest and platform_tag.startswith("win_")):
++            parts.extend([python_tag, abi_tag, platform_tag])
+ 
+     if digest:
+         parts.append(digest[:8])