Directory with an empty pyproject.toml files is built into an sdist+wheel by setuptools 64

Fixes pypa#3511

Author: 3rdigen

.devcontainer/devcontainer.json

@@ -0,0 +1 @@
+{"image":"mcr.microsoft.com/devcontainers/universal:2"}

.vscode/launch.json

@@ -0,0 +1,5 @@
+{
+    "configurations": 
+
+    ]
+}

_distutils_hack/__init__.py

@@ -1,9 +1,10 @@
 # don't import any costly modules
 import sys
 import os
+from _distutils_hack.clear_distutils import clear_distutils
+from _distutils_hack.is_pypy import is_pypy
 
-
-is_pypy = '__pypy__' in sys.builtin_module_names
+from _distutils_hack.override import enabled
 
 
 def warn_distutils_present():
@@ -25,29 +26,6 @@ def warn_distutils_present():
     )
 
 
-def clear_distutils():
-    if 'distutils' not in sys.modules:
-        return
-    import warnings
-
-    warnings.warn("Setuptools is replacing distutils.")
-    mods = [
-        name
-        for name in sys.modules
-        if name == "distutils" or name.startswith("distutils.")
-    ]
-    for name in mods:
-        del sys.modules[name]
-
-
-def enabled():
-    """
-    Allow selection of distutils by environment variable.
-    """
-    which = os.environ.get('SETUPTOOLS_USE_DISTUTILS', 'local')
-    return which == 'local'
-
-
 def ensure_local_distutils():
     import importlib
 
@@ -220,3 +198,4 @@ def remove_shim():
         sys.meta_path.remove(DISTUTILS_FINDER)
     except ValueError:
         pass
+

_distutils_hack/is_pypy.py

@@ -0,0 +1,4 @@
+from pkg_resources import new_func
+
+
+is_pypy = new_func()