Move implementation to monkey.patch.

Author: jaraco

setuptools/_core_metadata.py

@@ -17,6 +17,7 @@
 from . import _normalization, _reqs
 from .extern.packaging.markers import Marker
 from .extern.packaging.requirements import Requirement
+from .extern.packaging.utils import canonicalize_name, canonicalize_version
 from .extern.packaging.version import Version
 from .warnings import SetuptoolsDeprecationWarning
 
@@ -257,3 +258,11 @@ def _write_provides_extra(file, processed_extras, safe, unsafe):
     else:
         processed_extras[safe] = unsafe
         file.write(f"Provides-Extra: {safe}\n")
+
+
+# from pypa/distutils#244; needed only until that logic is always available
+def get_fullname(self):
+    return "{}-{}".format(
+        canonicalize_name(self.get_name()).replace('-', '_'),
+        canonicalize_version(self.get_version()),
+    )

setuptools/dist.py

@@ -7,7 +7,6 @@
 import os
 import re
 import sys
-import contextlib
 from contextlib import suppress
 from glob import iglob
 from pathlib import Path
@@ -27,7 +26,6 @@
 from .extern.ordered_set import OrderedSet
 from .extern.packaging.markers import InvalidMarker, Marker
 from .extern.packaging.specifiers import InvalidSpecifier, SpecifierSet
-from .extern.packaging.utils import canonicalize_name, canonicalize_version
 from .extern.packaging.version import Version
 
 from . import _entry_points
@@ -966,28 +964,7 @@ def run_command(self, command):
         # Postpone defaults until all explicit configuration is considered
         # (setup() args, config files, command line and plugins)
 
-        with self._override_get_fullname():
-            super().run_command(command)
-
-    @contextlib.contextmanager
-    def _override_get_fullname(self):
-        def _get_fullname_canonicalized(self):
-            return "{}-{}".format(
-                canonicalize_name(self.get_name()).replace('-', '_'),
-                canonicalize_version(self.get_version()),
-            )
-
-        class NoValue:
-            pass
-
-        orig_val = getattr(self, 'get_fullname', NoValue)
-        self.get_fullname = _get_fullname_canonicalized.__get__(self)
-
-        try:
-            yield
-        finally:
-            if orig_val is not NoValue:
-                self.get_fullname = orig_val
+        super().run_command(command)
 
 
 class DistDeprecationWarning(SetuptoolsDeprecationWarning):

setuptools/monkey.py

@@ -95,6 +95,7 @@ def _patch_distribution_metadata():
         'write_pkg_file',
         'read_pkg_file',
         'get_metadata_version',
+        'get_fullname',
     ):
         new_val = getattr(_core_metadata, attr)
         setattr(distutils.dist.DistributionMetadata, attr, new_val)