Disallow deprecated dash-separated and uppercase options in setup.cfg

newsfragments/4870.removal.rst

@@ -0,0 +1,10 @@
+Setuptools no longer accepts options containing uppercase or dash characters in ``setup.cfg``.
+Please ensure to write the options in ``setup.cfg`` using the :wiki:`lower_snake_case <Snake_case>` convention
+(e.g. ``Name => name``, ``install-requires => install_requires``).
+This is a follow-up on deprecations introduced in
+`v54.1.0 <https://setuptools.pypa.io/en/latest/history.html#v54-1-0>`_ (see #1608) and
+`v54.1.1 <https://setuptools.pypa.io/en/latest/history.html#v54-1-1>`_ (see #2592).
+
+.. note::
+   This change *does not affect configurations in* ``pyproject.toml``
+   (which uses the :wiki:`lower-kebab-case <Letter_case#Kebab_case>` convention following the precedent set in :pep:`517`/:pep:`518`).

setuptools/dist.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import functools
 import io
 import itertools
 import numbers
@@ -27,6 +28,7 @@
 from ._reqs import _StrOrIter
 from .config import pyprojecttoml, setupcfg
 from .discovery import ConfigDiscovery
+from .errors import InvalidConfigError
 from .monkey import get_unpatched
 from .warnings import InformationOnly, SetuptoolsDeprecationWarning
 
@@ -490,8 +492,8 @@ def _parse_config_files(self, filenames=None):  # noqa: C901
                         continue
 
                     val = parser.get(section, opt)
-                    opt = self.warn_dash_deprecation(opt, section)
-                    opt = self.make_option_lowercase(opt, section)
+                    opt = self._enforce_underscore(opt, section)
+                    opt = self._enforce_option_lowercase(opt, section)
                     opt_dict[opt] = (filename, val)
 
             # Make the ConfigParser forget everything (so we retain
@@ -516,64 +518,42 @@ def _parse_config_files(self, filenames=None):  # noqa: C901
             except ValueError as e:
                 raise DistutilsOptionError(e) from e
 
-    def warn_dash_deprecation(self, opt: str, section: str) -> str:
-        if section in (
-            'options.extras_require',
-            'options.data_files',
-        ):
+    def _enforce_underscore(self, opt: str, section: str) -> str:
+        if "-" not in opt or self._skip_setupcfg_normalization(section):
             return opt
 
-        underscore_opt = opt.replace('-', '_')
-        commands = list(
-            itertools.chain(
-                distutils.command.__all__,
-                self._setuptools_commands(),
-            )
+        raise InvalidConfigError(
+            f"Invalid dash-separated key {opt!r} in {section!r} (setup.cfg), "
+            f"please use the underscore name {opt.replace('-', '_')!r} instead."
+            # Warning initially introduced in 3 Mar 2021
         )
-        if (
-            not section.startswith('options')
-            and section != 'metadata'
-            and section not in commands
-        ):
-            return underscore_opt
-
-        if '-' in opt:
-            SetuptoolsDeprecationWarning.emit(
-                "Invalid dash-separated options",
-                f"""
-                Usage of dash-separated {opt!r} will not be supported in future
-                versions. Please use the underscore name {underscore_opt!r} instead.
-                """,
-                see_docs="userguide/declarative_config.html",
-                due_date=(2025, 3, 3),
-                # Warning initially introduced in 3 Mar 2021
-            )
-        return underscore_opt
 
-    def _setuptools_commands(self):
-        try:
-            entry_points = metadata.distribution('setuptools').entry_points
-            return {ep.name for ep in entry_points}  # Avoid newer API for compatibility
-        except metadata.PackageNotFoundError:
-            # during bootstrapping, distribution doesn't exist
-            return []
-
-    def make_option_lowercase(self, opt: str, section: str) -> str:
-        if section != 'metadata' or opt.islower():
+    def _enforce_option_lowercase(self, opt: str, section: str) -> str:
+        if opt.islower() or self._skip_setupcfg_normalization(section):
             return opt
 
-        lowercase_opt = opt.lower()
-        SetuptoolsDeprecationWarning.emit(
-            "Invalid uppercase configuration",
-            f"""
-            Usage of uppercase key {opt!r} in {section!r} will not be supported in
-            future versions. Please use lowercase {lowercase_opt!r} instead.
-            """,
-            see_docs="userguide/declarative_config.html",
-            due_date=(2025, 3, 3),
+        raise InvalidConfigError(
+            f"Invalid uppercase key {opt!r} in {section!r} (setup.cfg), "
+            f"please use lowercase {opt.lower()!r} instead."
             # Warning initially introduced in 6 Mar 2021
         )
-        return lowercase_opt
+
+    def _skip_setupcfg_normalization(self, section: str) -> bool:
+        skip = (
+            'options.extras_require',
+            'options.data_files',
+            'options.entry_points',
+            'options.package_data',
+            'options.exclude_package_data',
+        )
+        return section in skip or not self._is_setuptools_section(section)
+
+    def _is_setuptools_section(self, section: str) -> bool:
+        return (
+            section == "metadata"
+            or section.startswith("options")
+            or section in _setuptools_commands()
+        )
 
     # FIXME: 'Distribution._set_command_options' is too complex (14)
     def _set_command_options(self, command_obj, option_dict=None):  # noqa: C901
@@ -999,6 +979,18 @@ def run_command(self, command) -> None:
         super().run_command(command)
 
 
+@functools.cache
+def _setuptools_commands() -> set[str]:
+    try:
+        # Use older API for importlib.metadata compatibility
+        entry_points = metadata.distribution('setuptools').entry_points
+        eps: Iterable[str] = (ep.name for ep in entry_points)
+    except metadata.PackageNotFoundError:
+        # during bootstrapping, distribution doesn't exist
+        eps = []
+    return {*distutils.command.__all__, *eps}
+
+
 class DistDeprecationWarning(SetuptoolsDeprecationWarning):
     """Class for warning about deprecations in dist in
     setuptools. Not ignored by default, unlike DeprecationWarning."""

setuptools/tests/config/test_setupcfg.py

@@ -1,6 +1,7 @@
 import configparser
 import contextlib
 import inspect
+import re
 from pathlib import Path
 from unittest.mock import Mock, patch
 
@@ -9,6 +10,7 @@
 
 from setuptools.config.setupcfg import ConfigHandler, Target, read_configuration
 from setuptools.dist import Distribution, _Distribution
+from setuptools.errors import InvalidConfigError
 from setuptools.warnings import SetuptoolsDeprecationWarning
 
 from ..textwrap import DALS
@@ -420,36 +422,36 @@ def test_not_utf8(self, tmpdir):
             with get_dist(tmpdir):
                 pass
 
-    @pytest.mark.xfail(reason="#4864")
-    def test_warn_dash_deprecation(self, tmpdir):
-        # warn_dash_deprecation() is a method in setuptools.dist
-        # remove this test and the method when no longer needed
-        fake_env(
-            tmpdir,
-            '[metadata]\n'
-            'author-email = [email protected]\n'
-            'maintainer_email = foo@foo.com\n',
-        )
-        msg = "Usage of dash-separated 'author-email' will not be supported"
-        with pytest.warns(SetuptoolsDeprecationWarning, match=msg):
-            with get_dist(tmpdir) as dist:
-                metadata = dist.metadata
-
-        assert metadata.author_email == '[email protected]'
-        assert metadata.maintainer_email == '[email protected]'
-
-    @pytest.mark.xfail(reason="#4864")
-    def test_make_option_lowercase(self, tmpdir):
-        # remove this test and the method make_option_lowercase() in setuptools.dist
-        # when no longer needed
-        fake_env(tmpdir, '[metadata]\nName = foo\ndescription = Some description\n')
-        msg = "Usage of uppercase key 'Name' in 'metadata' will not be supported"
-        with pytest.warns(SetuptoolsDeprecationWarning, match=msg):
-            with get_dist(tmpdir) as dist:
-                metadata = dist.metadata
-
-        assert metadata.name == 'foo'
-        assert metadata.description == 'Some description'
+    @pytest.mark.parametrize(
+        ("error_msg", "config"),
+        [
+            (
+                "Invalid dash-separated key 'author-email' in 'metadata' (setup.cfg)",
+                DALS(
+                    """
+                    [metadata]
+                    author-email = test@test.com
+                    maintainer_email = [email protected]
+                    """
+                ),
+            ),
+            (
+                "Invalid uppercase key 'Name' in 'metadata' (setup.cfg)",
+                DALS(
+                    """
+                    [metadata]
+                    Name = foo
+                    description = Some description
+                    """
+                ),
+            ),
+        ],
+    )
+    def test_invalid_options_previously_deprecated(self, tmpdir, error_msg, config):
+        # this test and related methods can be removed when no longer needed
+        fake_env(tmpdir, config)
+        with pytest.raises(InvalidConfigError, match=re.escape(error_msg)):
+            get_dist(tmpdir).__enter__()
 
 
 class TestOptions: