Bypass distutils loader when setuptools module is no longer available…

… on sys.path. Fixes #2980.
pypa · Dec 28, 2021 · 9c9c91c · 9c9c91c
1 parent dcdeedb
commit 9c9c91c
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diff --git a/_distutils_hack/__init__.py b/_distutils_hack/__init__.py
@@ -86,6 +86,13 @@ def spec_for_distutils(self):
         import importlib.abc
         import importlib.util
 
+        # In cases of path manipulation during sitecustomize,
+        # Setuptools might actually not be present even though
+        # the hook has been loaded. Allow the caller to fall
+        # back to stdlib behavior. See #2980.
+        if not importlib.util.find_spec('setuptools'):
+            return
+
         class DistutilsLoader(importlib.abc.Loader):
 
             def create_module(self, spec):

diff --git a/changelog.d/2980.misc.rst b/changelog.d/2980.misc.rst
@@ -0,0 +1 @@
+Bypass distutils loader when setuptools module is no longer available on sys.path.