In install command, use super to call the superclass methods. Avoids …

…race conditions when monkeypatching from _distutils_system_mod occurs late.

Fixes #4136

newsfragments/4136.bugfix.rst

@@ -0,0 +1 @@
+In install command, use super to call the superclass methods. Avoids race conditions when monkeypatching from _distutils_system_mod occurs late.

setuptools/command/install.py

@@ -49,12 +49,12 @@ def initialize_options(self):
             #       and then add a due_date to this warning.
         )
 
-        orig.install.initialize_options(self)
+        super().initialize_options()
         self.old_and_unmanageable = None
         self.single_version_externally_managed = None
 
     def finalize_options(self):
-        orig.install.finalize_options(self)
+        super().finalize_options()
         if self.root:
             self.single_version_externally_managed = True
         elif self.single_version_externally_managed:
@@ -78,11 +78,11 @@ def handle_extra_path(self):
     def run(self):
         # Explicit request for old-style install?  Just do it
         if self.old_and_unmanageable or self.single_version_externally_managed:
-            return orig.install.run(self)
+            return super().run()
 
         if not self._called_from_setup(inspect.currentframe()):
             # Run in backward-compatibility mode to support bdist_* commands.
-            orig.install.run(self)
+            super().run()
         else:
             self.do_egg_install()