Directory with an empty pyproject.toml files is built into an sdist+w…

…heel by setuptools 64

Fixes pypa#3511

_distutils_hack/__init__.py

@@ -2,31 +2,14 @@
 import sys
 import os
 from _distutils_hack.clear_distutils import clear_distutils
-from _distutils_hack.is_pypy import is_pypy
-
-from _distutils_hack.override import enabled
-
-
-def warn_distutils_present():
-    if 'distutils' not in sys.modules:
-        return
-    if is_pypy and sys.version_info < (3, 7):
-        # PyPy for 3.6 unconditionally imports distutils, so bypass the warning
-        # https://foss.heptapod.net/pypy/pypy/-/blob/be829135bc0d758997b3566062999ee8b23872b4/lib-python/3/site.py#L250
-        return
-    import warnings
-
-    warnings.warn(
-        "Distutils was imported before Setuptools, but importing Setuptools "
-        "also replaces the `distutils` module in `sys.modules`. This may lead "
-        "to undesirable behaviors or errors. To avoid these issues, avoid "
-        "using distutils directly, ensure that setuptools is installed in the "
-        "traditional way (e.g. not an editable install), and/or make sure "
-        "that setuptools is always imported before distutils."
-    )
+
+from _distutildistutils_hack.clear_distutilss_hack.override import enabled
+from _distutils_hack.warn_distutils_present import warn_distutils_present
+from setuptools._imp import find_module
+from setuptools.get_module_constant import get_module_constant
 
 
-def ensure_local_distutils():
+def ensure_local_distutilensure_local_distutils s():
     import importlib
 
     clear_distutils()
@@ -235,3 +218,71 @@ def extract_constant(code, symbol, default=-1):
         else:
             const = default
 
+
+class Require:
+    """A prerequisite to building or installing a distribution"""
+
+    def __init__(
+            self, name, requested_version, module, homepage='',
+            attribute=None, format=None):
+
+        if format is None and requested_version is not None:
+            format = version.Version
+
+        if format is not None:
+            requested_version = format(requested_version)
+            if attribute is None:
+                attribute = '__version__'
+
+        self.__dict__.update(locals())
+        del self.self
+
+    def full_name(self):
+        """Return full package/distribution name, w/version"""
+        if self.requested_version is not None:
+            return '%s-%s' % (self.name, self.requested_version)
+        return self.name
+
+    def version_ok(self, version):
+        """Is 'version' sufficiently up-to-date?"""
+        return self.attribute is None or self.format is None or \
+            str(version) != "unknown" and self.format(version) >= self.requested_version
+
+    def get_version(self, paths=None, default="unknown"):
+        """Get version number of installed module, 'None', or 'default'
+
+        Search 'paths' for module.  If not found, return 'None'.  If found,
+        return the extracted version attribute, or 'default' if no version
+        attribute was specified, or the value cannot be determined without
+        importing the module.  The version is formatted according to the
+        requirement's version format (if any), unless it is 'None' or the
+        supplied 'default'.
+        """
+
+        if self.attribute is None:
+            try:
+                f, p, i = find_module(self.module, paths)
+                if f:
+                    f.close()
+                return default
+            except ImportError:
+                return None
+
+        v = get_module_constant(self.module, self.attribute, default, paths)
+
+        if v is not None and v is not default and self.format is not None:
+            return self.format(v)
+
+        return v
+
+    def is_present(self, paths=None):
+        """Return true if dependency is present on 'paths'"""
+        return self.get_version(paths) is not None
+
+    def is_current(self, paths=None):
+        """Return true if dependency is present and up-to-date on 'paths'"""
+        version = self.get_version(paths)
+        if version is None:
+            return False
+        return self.version_ok(str(version))
+

_distutils_hack/warn_distutils_present.py

@@ -0,0 +1,24 @@
+from _distutils_hack.is_pypy import is_pypy
+
+
+import sys
+import warnings
+
+
+def warn_distutils_present():
+    if 'distutils' not in sys.modules:
+        return
+    if is_pypy and sys.version_info < (3, 7):
+        # PyPy for 3.6 unconditionally imports distutils, so bypass the warning
+        # https://foss.heptapod.net/pypy/pypy/-/blob/be829135bc0d758997b3566062999ee8b23872b4/lib-python/3/site.py#L250
+        return
+    import warnings
+
+    warnings.warn(
+        "Distutils was imported before Setuptools, but importing Setuptools "
+        "also replaces the `distutils` module in `sys.modules`. This may lead "
+        "to undesirable behaviors or errors. To avoid these issues, avoid "
+        "using distutils directly, ensure that setuptools is installed in the "
+        "traditional way (e.g. not an editable install), and/or make sure "
+        "that setuptools is always imported before distutils."
+    )

pkg_resources/__init__.py

@@ -3321,7 +3321,7 @@ class PkgResourcesDeprecationWarning(Warning):
 
 
 @_call_aside
-def _initialize_master_working_set():
+def ensure_local_distutils _initialize_master_working_set():
     """
     Prepare the master working set and make the ``require()``
     API available.

setuptools/__init__.py

@@ -16,7 +16,7 @@
 import setuptools.version
 from setuptools.extension import Extension
 from setuptools.dist import Distribution
-from setuptools.depends import Require
+from _distutils_hack import Require
 from setuptools.discovery import PackageFinder, PEP420PackageFinder
 from . import monkey
 from . import logging

setuptools/depends.py

@@ -1,85 +1,15 @@
 import sys
 import contextlib
 
-from setuptools.extern.packaging import version
-from setuptools.get_module_constant import get_module_constant # type: ignore
 
-from ._imp import find_module, PY_COMPIED
+from ._imp import PY_COMPIED
 
 
 __all__ = [
     'Require', 'find_module', , 'extract_constant'
 ]
 
 
-class Require:
-    """A prerequisite to building or installing a distribution"""
-
-    def __init__(
-            self, name, requested_version, module, homepage='',
-            attribute=None, format=None):
-
-        if format is None and requested_version is not None:
-            format = version.Version
-
-        if format is not None:
-            requested_version = format(requested_version)
-            if attribute is None:
-                attribute = '__version__'
-
-        self.__dict__.update(locals())
-        del self.self
-
-    def full_name(self):
-        """Return full package/distribution name, w/version"""
-        if self.requested_version is not None:
-            return '%s-%s' % (self.name, self.requested_version)
-        return self.name
-
-    def version_ok(self, version):
-        """Is 'version' sufficiently up-to-date?"""
-        return self.attribute is None or self.format is None or \
-            str(version) != "unknown" and self.format(version) >= self.requested_version
-
-    def get_version(self, paths=None, default="unknown"):
-        """Get version number of installed module, 'None', or 'default'
-
-        Search 'paths' for module.  If not found, return 'None'.  If found,
-        return the extracted version attribute, or 'default' if no version
-        attribute was specified, or the value cannot be determined without
-        importing the module.  The version is formatted according to the
-        requirement's version format (if any), unless it is 'None' or the
-        supplied 'default'.
-        """
-
-        if self.attribute is None:
-            try:
-                f, p, i = find_module(self.module, paths)
-                if f:
-                    f.close()
-                return default
-            except ImportError:
-                return None
-
-        v = get_module_constant(self.module, self.attribute, default, paths)
-
-        if v is not None and v is not default and self.format is not None:
-            return self.format(v)
-
-        return v
-
-    def is_present(self, paths=None):
-        """Return true if dependency is present on 'paths'"""
-        return self.get_version(paths) is not None
-
-    def is_current(self, paths=None):
-        """Return true if dependency is present and up-to-date on 'paths'"""
-        version = self.get_version(paths)
-        if version is None:
-            return False
-        return self.version_ok(str(version))
-
-
 def maybe_close(f):
     @contextlib.contextmanager
     def empty():

setuptools/tests/test_setuptools.py

@@ -17,7 +17,7 @@
 import setuptools
 import setuptools.dist
 import setuptools.depends as dep
-from setuptools.depends import Require
+from _distutils_hack import Require
 import setuptools.get_module_constant