From f350a98aaf9f800859f8e83422ff056157beec5d Mon Sep 17 00:00:00 2001
From: Michael Carlstrom <rmc@carlstrom.com>
Date: Thu, 18 Jul 2024 22:58:46 -0400
Subject: [PATCH 01/18] Allow path objects

---
 distutils/command/install_data.py    | 11 +++++++++++
 distutils/tests/test_install_data.py | 26 +++++++++++++++++---------
 2 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/distutils/command/install_data.py b/distutils/command/install_data.py
index 624c0b90..6b7c9aef 100644
--- a/distutils/command/install_data.py
+++ b/distutils/command/install_data.py
@@ -6,6 +6,7 @@
 # contributed by Bastian Kleineidam
 
 import os
+from pathlib import Path
 
 from ..core import Command
 from ..util import change_root, convert_path
@@ -56,6 +57,16 @@ def run(self):
                     )
                 (out, _) = self.copy_file(f, self.install_dir)
                 self.outfiles.append(out)
+            elif isinstance(f, Path):
+                # it's a simple file, so copy it
+                f = convert_path(str(f))
+                if self.warn_dir:
+                    self.warn(
+                        "setup script did not provide a directory for "
+                        f"'{f}' -- installing right in '{self.install_dir}'"
+                    )
+                (out, _) = self.copy_file(f, self.install_dir)
+                self.outfiles.append(out)
             else:
                 # it's a tuple with path to install to and a list of files
                 dir = convert_path(f[0])
diff --git a/distutils/tests/test_install_data.py b/distutils/tests/test_install_data.py
index f34070b1..43fd98ed 100644
--- a/distutils/tests/test_install_data.py
+++ b/distutils/tests/test_install_data.py
@@ -1,6 +1,7 @@
 """Tests for distutils.command.install_data."""
 
 import os
+from pathlib import Path
 from distutils.command.install_data import install_data
 from distutils.tests import support
 
@@ -18,22 +19,27 @@ def test_simple_run(self):
 
         # data_files can contain
         #  - simple files
+        #  - a Path object
         #  - a tuple with a path, and a list of file
         one = os.path.join(pkg_dir, 'one')
         self.write_file(one, 'xxx')
         inst2 = os.path.join(pkg_dir, 'inst2')
         two = os.path.join(pkg_dir, 'two')
         self.write_file(two, 'xxx')
+        three = Path(pkg_dir) / 'three'
+        self.write_file(three, 'xxx')
 
-        cmd.data_files = [one, (inst2, [two])]
-        assert cmd.get_inputs() == [one, (inst2, [two])]
+        cmd.data_files = [one, (inst2, [two]), three]
+        assert cmd.get_inputs() == [one, (inst2, [two]), three]
 
         # let's run the command
         cmd.ensure_finalized()
         cmd.run()
 
         # let's check the result
-        assert len(cmd.get_outputs()) == 2
+        assert len(cmd.get_outputs()) == 3
+        rthree = os.path.split(one)[-1]
+        assert os.path.exists(os.path.join(inst, rthree))
         rtwo = os.path.split(two)[-1]
         assert os.path.exists(os.path.join(inst2, rtwo))
         rone = os.path.split(one)[-1]
@@ -46,21 +52,23 @@ def test_simple_run(self):
         cmd.run()
 
         # let's check the result
-        assert len(cmd.get_outputs()) == 2
+        assert len(cmd.get_outputs()) == 3
+        assert os.path.exists(os.path.join(inst, rthree))
         assert os.path.exists(os.path.join(inst2, rtwo))
         assert os.path.exists(os.path.join(inst, rone))
         cmd.outfiles = []
 
         # now using root and empty dir
         cmd.root = os.path.join(pkg_dir, 'root')
-        inst4 = os.path.join(pkg_dir, 'inst4')
-        three = os.path.join(cmd.install_dir, 'three')
-        self.write_file(three, 'xx')
-        cmd.data_files = [one, (inst2, [two]), ('inst3', [three]), (inst4, [])]
+        inst5 = os.path.join(pkg_dir, 'inst5')
+        four = os.path.join(cmd.install_dir, 'four')
+        self.write_file(four, 'xx')
+        cmd.data_files = [one, (inst2, [two]), ('inst5', [four]), (inst5, [])]
         cmd.ensure_finalized()
         cmd.run()
 
         # let's check the result
-        assert len(cmd.get_outputs()) == 4
+        assert len(cmd.get_outputs()) == 5
+        assert os.path.exists(os.path.join(inst, rthree))
         assert os.path.exists(os.path.join(inst2, rtwo))
         assert os.path.exists(os.path.join(inst, rone))

From 202ff81fb5adcbde9cf990f27a6c9fbdc4ad7602 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 15:17:08 -0400
Subject: [PATCH 02/18] Need to include 'three' in the input.

---
 distutils/tests/test_install_data.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/distutils/tests/test_install_data.py b/distutils/tests/test_install_data.py
index 43fd98ed..e340c758 100644
--- a/distutils/tests/test_install_data.py
+++ b/distutils/tests/test_install_data.py
@@ -63,7 +63,7 @@ def test_simple_run(self):
         inst5 = os.path.join(pkg_dir, 'inst5')
         four = os.path.join(cmd.install_dir, 'four')
         self.write_file(four, 'xx')
-        cmd.data_files = [one, (inst2, [two]), ('inst5', [four]), (inst5, [])]
+        cmd.data_files = [one, (inst2, [two]), three, ('inst5', [four]), (inst5, [])]
         cmd.ensure_finalized()
         cmd.run()
 

From c2d9fba3913a4394c9222199eb8518197df2ff06 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 15:25:43 -0400
Subject: [PATCH 03/18] Consolidate str and Path handling.

---
 distutils/command/install_data.py | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/distutils/command/install_data.py b/distutils/command/install_data.py
index 6b7c9aef..a53786b9 100644
--- a/distutils/command/install_data.py
+++ b/distutils/command/install_data.py
@@ -47,19 +47,9 @@ def finalize_options(self):
     def run(self):
         self.mkpath(self.install_dir)
         for f in self.data_files:
-            if isinstance(f, str):
+            if isinstance(f, (str, Path)):
                 # it's a simple file, so copy it
-                f = convert_path(f)
-                if self.warn_dir:
-                    self.warn(
-                        "setup script did not provide a directory for "
-                        f"'{f}' -- installing right in '{self.install_dir}'"
-                    )
-                (out, _) = self.copy_file(f, self.install_dir)
-                self.outfiles.append(out)
-            elif isinstance(f, Path):
-                # it's a simple file, so copy it
-                f = convert_path(str(f))
+                f = convert_path(os.fspath(f))
                 if self.warn_dir:
                     self.warn(
                         "setup script did not provide a directory for "

From 29281a6441f5c95baf451b8c6a05b5ac9dd95796 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 15:37:03 -0400
Subject: [PATCH 04/18] Expand convert_path to also accept pathlib.Path
 objects.

---
 distutils/command/install_data.py |  2 +-
 distutils/tests/test_util.py      |  5 +++++
 distutils/util.py                 | 10 +++++++++-
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/distutils/command/install_data.py b/distutils/command/install_data.py
index a53786b9..735adf2b 100644
--- a/distutils/command/install_data.py
+++ b/distutils/command/install_data.py
@@ -49,7 +49,7 @@ def run(self):
         for f in self.data_files:
             if isinstance(f, (str, Path)):
                 # it's a simple file, so copy it
-                f = convert_path(os.fspath(f))
+                f = convert_path(f)
                 if self.warn_dir:
                     self.warn(
                         "setup script did not provide a directory for "
diff --git a/distutils/tests/test_util.py b/distutils/tests/test_util.py
index 0de4e1a5..a614a1da 100644
--- a/distutils/tests/test_util.py
+++ b/distutils/tests/test_util.py
@@ -5,6 +5,7 @@
 import email.policy
 import io
 import os
+import pathlib
 import sys
 import sysconfig as stdlib_sysconfig
 import unittest.mock as mock
@@ -72,6 +73,7 @@ def _join(path):
         os.path.join = _join
 
         assert convert_path('/home/to/my/stuff') == '/home/to/my/stuff'
+        assert convert_path(pathlib.Path('/home/to/my/stuff')) == '/home/to/my/stuff'
 
         # win
         os.sep = '\\'
@@ -85,8 +87,11 @@ def _join(*path):
             convert_path('/home/to/my/stuff')
         with pytest.raises(ValueError):
             convert_path('home/to/my/stuff/')
+        with pytest.raises(ValueError):
+            convert_path(pathlib.Path('/home/to/my/stuff'))
 
         assert convert_path('home/to/my/stuff') == 'home\\to\\my\\stuff'
+        assert convert_path(pathlib.Path('home/to/my/stuff')) == 'home\\to\\my\\stuff'
         assert convert_path('.') == os.curdir
 
     def test_change_root(self):
diff --git a/distutils/util.py b/distutils/util.py
index 9db89b09..635d715a 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -7,6 +7,7 @@
 import functools
 import importlib.util
 import os
+import pathlib
 import re
 import string
 import subprocess
@@ -116,7 +117,14 @@ def split_version(s):
     return [int(n) for n in s.split('.')]
 
 
-def convert_path(pathname):
+def convert_path(pathname: str | pathlib.Path) -> str:
+    """
+    Allow for pathlib.Path inputs and then make native.
+    """
+    return make_native(os.fspath(pathname))
+
+
+def make_native(pathname: str) -> str:
     """Return 'pathname' as a name that will work on the native filesystem,
     i.e. split it on '/' and put it back together again using the current
     directory separator.  Needed because filenames in the setup script are

From 2a7122a885ddf34664ed9f6edb88c66a8510ef68 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 15:37:53 -0400
Subject: [PATCH 05/18] Prefer simply 'pathlib' for import.

---
 distutils/command/install_data.py    | 4 ++--
 distutils/tests/test_install_data.py | 9 +++++----
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/distutils/command/install_data.py b/distutils/command/install_data.py
index 735adf2b..cb03d0e5 100644
--- a/distutils/command/install_data.py
+++ b/distutils/command/install_data.py
@@ -6,7 +6,7 @@
 # contributed by Bastian Kleineidam
 
 import os
-from pathlib import Path
+import pathlib
 
 from ..core import Command
 from ..util import change_root, convert_path
@@ -47,7 +47,7 @@ def finalize_options(self):
     def run(self):
         self.mkpath(self.install_dir)
         for f in self.data_files:
-            if isinstance(f, (str, Path)):
+            if isinstance(f, (str, pathlib.Path)):
                 # it's a simple file, so copy it
                 f = convert_path(f)
                 if self.warn_dir:
diff --git a/distutils/tests/test_install_data.py b/distutils/tests/test_install_data.py
index e340c758..4b15a269 100644
--- a/distutils/tests/test_install_data.py
+++ b/distutils/tests/test_install_data.py
@@ -1,12 +1,13 @@
 """Tests for distutils.command.install_data."""
 
 import os
-from pathlib import Path
-from distutils.command.install_data import install_data
-from distutils.tests import support
+import pathlib
 
 import pytest
 
+from distutils.command.install_data import install_data
+from distutils.tests import support
+
 
 @pytest.mark.usefixtures('save_env')
 class TestInstallData(
@@ -26,7 +27,7 @@ def test_simple_run(self):
         inst2 = os.path.join(pkg_dir, 'inst2')
         two = os.path.join(pkg_dir, 'two')
         self.write_file(two, 'xxx')
-        three = Path(pkg_dir) / 'three'
+        three = pathlib.Path(pkg_dir) / 'three'
         self.write_file(three, 'xxx')
 
         cmd.data_files = [one, (inst2, [two]), three]

From 6099343a445935b13136da23a4b92d816dd5ee29 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 15:44:54 -0400
Subject: [PATCH 06/18] Extract a singledispatchmethod _copy for handling the
 copy of each data file.

---
 distutils/command/install_data.py | 69 ++++++++++++++++++-------------
 1 file changed, 40 insertions(+), 29 deletions(-)

diff --git a/distutils/command/install_data.py b/distutils/command/install_data.py
index cb03d0e5..e13b5ca6 100644
--- a/distutils/command/install_data.py
+++ b/distutils/command/install_data.py
@@ -5,13 +5,19 @@
 
 # contributed by Bastian Kleineidam
 
+import functools
 import os
 import pathlib
 
+from typing import Tuple, Iterable
+
 from ..core import Command
 from ..util import change_root, convert_path
 
 
+StrPath = str | pathlib.Path
+
+
 class install_data(Command):
     description = "install data files"
 
@@ -47,36 +53,41 @@ def finalize_options(self):
     def run(self):
         self.mkpath(self.install_dir)
         for f in self.data_files:
-            if isinstance(f, (str, pathlib.Path)):
-                # it's a simple file, so copy it
-                f = convert_path(f)
-                if self.warn_dir:
-                    self.warn(
-                        "setup script did not provide a directory for "
-                        f"'{f}' -- installing right in '{self.install_dir}'"
-                    )
-                (out, _) = self.copy_file(f, self.install_dir)
+            self._copy(f)
+
+    @functools.singledispatchmethod
+    def _copy(self, f: StrPath | Tuple[StrPath, Iterable[StrPath]]):
+        # it's a tuple with path to install to and a list of files
+        dir = convert_path(f[0])
+        if not os.path.isabs(dir):
+            dir = os.path.join(self.install_dir, dir)
+        elif self.root:
+            dir = change_root(self.root, dir)
+        self.mkpath(dir)
+
+        if f[1] == []:
+            # If there are no files listed, the user must be
+            # trying to create an empty directory, so add the
+            # directory to the list of output files.
+            self.outfiles.append(dir)
+        else:
+            # Copy files, adding them to the list of output files.
+            for data in f[1]:
+                data = convert_path(data)
+                (out, _) = self.copy_file(data, dir)
                 self.outfiles.append(out)
-            else:
-                # it's a tuple with path to install to and a list of files
-                dir = convert_path(f[0])
-                if not os.path.isabs(dir):
-                    dir = os.path.join(self.install_dir, dir)
-                elif self.root:
-                    dir = change_root(self.root, dir)
-                self.mkpath(dir)
-
-                if f[1] == []:
-                    # If there are no files listed, the user must be
-                    # trying to create an empty directory, so add the
-                    # directory to the list of output files.
-                    self.outfiles.append(dir)
-                else:
-                    # Copy files, adding them to the list of output files.
-                    for data in f[1]:
-                        data = convert_path(data)
-                        (out, _) = self.copy_file(data, dir)
-                        self.outfiles.append(out)
+
+    @_copy.register
+    def _(self, f: StrPath):
+        # it's a simple file, so copy it
+        f = convert_path(f)
+        if self.warn_dir:
+            self.warn(
+                "setup script did not provide a directory for "
+                f"'{f}' -- installing right in '{self.install_dir}'"
+            )
+        (out, _) = self.copy_file(f, self.install_dir)
+        self.outfiles.append(out)
 
     def get_inputs(self):
         return self.data_files or []

From 3a2d7a62e355db2d1e67af38ba2be03c63099480 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 16:12:53 -0400
Subject: [PATCH 07/18] Use explicit registration for compatibility with older
 Pythons.

Prior to 3.11, singledispatch[method] doesn't know about unions.
---
 distutils/command/install_data.py | 15 +++++++--------
 distutils/util.py                 |  2 ++
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/distutils/command/install_data.py b/distutils/command/install_data.py
index e13b5ca6..bd2932ab 100644
--- a/distutils/command/install_data.py
+++ b/distutils/command/install_data.py
@@ -5,19 +5,17 @@
 
 # contributed by Bastian Kleineidam
 
+from __future__ import annotations
+
 import functools
 import os
-import pathlib
 
-from typing import Tuple, Iterable
+from typing import Iterable
 
 from ..core import Command
 from ..util import change_root, convert_path
 
 
-StrPath = str | pathlib.Path
-
-
 class install_data(Command):
     description = "install data files"
 
@@ -56,7 +54,7 @@ def run(self):
             self._copy(f)
 
     @functools.singledispatchmethod
-    def _copy(self, f: StrPath | Tuple[StrPath, Iterable[StrPath]]):
+    def _copy(self, f: tuple[str | os.PathLike, Iterable[str | os.PathLike]]):
         # it's a tuple with path to install to and a list of files
         dir = convert_path(f[0])
         if not os.path.isabs(dir):
@@ -77,8 +75,9 @@ def _copy(self, f: StrPath | Tuple[StrPath, Iterable[StrPath]]):
                 (out, _) = self.copy_file(data, dir)
                 self.outfiles.append(out)
 
-    @_copy.register
-    def _(self, f: StrPath):
+    @_copy.register(str)
+    @_copy.register(os.PathLike)
+    def _(self, f: str | os.PathLike):
         # it's a simple file, so copy it
         f = convert_path(f)
         if self.warn_dir:
diff --git a/distutils/util.py b/distutils/util.py
index 635d715a..95503e95 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -4,6 +4,8 @@
 one of the other *util.py modules.
 """
 
+from __future__ import annotations
+
 import functools
 import importlib.util
 import os

From a5e3e5f47e333b0c3d04a5f35cf8a3a67a4ffb62 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 16:13:35 -0400
Subject: [PATCH 08/18] Prefer os.PathLike in convert_path

---
 distutils/util.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/distutils/util.py b/distutils/util.py
index 95503e95..7751eb94 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -9,7 +9,6 @@
 import functools
 import importlib.util
 import os
-import pathlib
 import re
 import string
 import subprocess
@@ -119,7 +118,7 @@ def split_version(s):
     return [int(n) for n in s.split('.')]
 
 
-def convert_path(pathname: str | pathlib.Path) -> str:
+def convert_path(pathname: str | os.PathLike) -> str:
     """
     Allow for pathlib.Path inputs and then make native.
     """

From 87f77315d5fb2b00e88db0bd6931a2f94c10cdfd Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 16:39:26 -0400
Subject: [PATCH 09/18] Convert needs to accept None for Setuptools' sake.

---
 distutils/util.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/distutils/util.py b/distutils/util.py
index 7751eb94..68565534 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -16,6 +16,7 @@
 import sysconfig
 import tempfile
 
+from ._functools import pass_none
 from ._log import log
 from ._modified import newer
 from .errors import DistutilsByteCompileError, DistutilsPlatformError
@@ -118,9 +119,16 @@ def split_version(s):
     return [int(n) for n in s.split('.')]
 
 
+@pass_none
 def convert_path(pathname: str | os.PathLike) -> str:
     """
     Allow for pathlib.Path inputs and then make native.
+
+    Also if None is passed, will just pass it through as
+    Setuptools relies on this behavior.
+
+    >>> convert_path(None) is None
+    True
     """
     return make_native(os.fspath(pathname))
 

From 2e6a69e92aa2eb5a85e068d8aa8e92427855a9fc Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 16:50:07 -0400
Subject: [PATCH 10/18] In test_convert_path, utilize posixpath.join and
 ntpath.join for maximum compatibility with other libraries.

---
 distutils/tests/test_util.py | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/distutils/tests/test_util.py b/distutils/tests/test_util.py
index a614a1da..b24f1fb4 100644
--- a/distutils/tests/test_util.py
+++ b/distutils/tests/test_util.py
@@ -4,8 +4,10 @@
 import email.generator
 import email.policy
 import io
+import ntpath
 import os
 import pathlib
+import posixpath
 import sys
 import sysconfig as stdlib_sysconfig
 import unittest.mock as mock
@@ -66,22 +68,14 @@ def test_get_platform(self):
     def test_convert_path(self):
         # linux/mac
         os.sep = '/'
-
-        def _join(path):
-            return '/'.join(path)
-
-        os.path.join = _join
+        os.path.join = posixpath.join
 
         assert convert_path('/home/to/my/stuff') == '/home/to/my/stuff'
         assert convert_path(pathlib.Path('/home/to/my/stuff')) == '/home/to/my/stuff'
 
         # win
         os.sep = '\\'
-
-        def _join(*path):
-            return '\\'.join(path)
-
-        os.path.join = _join
+        os.path.join = ntpath.join
 
         with pytest.raises(ValueError):
             convert_path('/home/to/my/stuff')

From 90cbfbe72f5ed07d1fd589bfb7c1660f66159756 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 17:06:10 -0400
Subject: [PATCH 11/18] Wrap paths in PurePosixPath to ensure that any
 WindowsPaths don't get backslashes.

---
 distutils/util.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/distutils/util.py b/distutils/util.py
index 68565534..f8e4fbb7 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -9,6 +9,7 @@
 import functools
 import importlib.util
 import os
+import pathlib
 import re
 import string
 import subprocess
@@ -130,7 +131,9 @@ def convert_path(pathname: str | os.PathLike) -> str:
     >>> convert_path(None) is None
     True
     """
-    return make_native(os.fspath(pathname))
+    # wrap in PurePosixPath to retain forward slashes on Windows
+    # see https://github.com/pypa/distutils/pull/272#issuecomment-2240100013
+    return make_native(os.fspath(pathlib.PurePosixPath(pathname)))
 
 
 def make_native(pathname: str) -> str:

From e2cbf97dda5929ae835c52921461c09bda521a06 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 19 Jul 2024 17:48:30 -0400
Subject: [PATCH 12/18] convert_path no longer fails if passed a path with a
 trailing slash. Instead, trailing slashes are stripped just as they are with
 pathlib.Path.

Ref https://github.com/pypa/distutils/pull/272#issuecomment-2240252653.
---
 distutils/tests/test_util.py | 2 --
 distutils/util.py            | 2 --
 2 files changed, 4 deletions(-)

diff --git a/distutils/tests/test_util.py b/distutils/tests/test_util.py
index b24f1fb4..c05df03a 100644
--- a/distutils/tests/test_util.py
+++ b/distutils/tests/test_util.py
@@ -79,8 +79,6 @@ def test_convert_path(self):
 
         with pytest.raises(ValueError):
             convert_path('/home/to/my/stuff')
-        with pytest.raises(ValueError):
-            convert_path('home/to/my/stuff/')
         with pytest.raises(ValueError):
             convert_path(pathlib.Path('/home/to/my/stuff'))
 
diff --git a/distutils/util.py b/distutils/util.py
index f8e4fbb7..50ebb1c1 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -151,8 +151,6 @@ def make_native(pathname: str) -> str:
         return pathname
     if pathname[0] == '/':
         raise ValueError(f"path '{pathname}' cannot be absolute")
-    if pathname[-1] == '/':
-        raise ValueError(f"path '{pathname}' cannot end with '/'")
 
     paths = pathname.split('/')
     while '.' in paths:

From 9d6ca5fe777e7bc2ab611814adac989789d7f023 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sat, 20 Jul 2024 14:25:46 -0400
Subject: [PATCH 13/18] convert_path now converts to a platform-native
 path.Path, but then calls `.as_posix()` on it.

This change will have the unintended effect of adding support for backslashes on Windows. Maybe that's fine, or maybe it should be prohibited.
---
 distutils/util.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/distutils/util.py b/distutils/util.py
index 50ebb1c1..3163eb48 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -123,17 +123,17 @@ def split_version(s):
 @pass_none
 def convert_path(pathname: str | os.PathLike) -> str:
     """
-    Allow for pathlib.Path inputs and then make native.
+    Allow for pathlib.Path inputs, coax to posix, and then make native.
 
-    Also if None is passed, will just pass it through as
+    If None is passed, will just pass it through as
     Setuptools relies on this behavior.
 
     >>> convert_path(None) is None
     True
     """
-    # wrap in PurePosixPath to retain forward slashes on Windows
+    # Use .as_posix() to retain forward slashes on Windows
     # see https://github.com/pypa/distutils/pull/272#issuecomment-2240100013
-    return make_native(os.fspath(pathlib.PurePosixPath(pathname)))
+    return make_native(pathlib.Path(pathname).as_posix())
 
 
 def make_native(pathname: str) -> str:

From 4eaa02f2fff8f8e6d4eac5442988dc586fe56004 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sat, 20 Jul 2024 14:45:06 -0400
Subject: [PATCH 14/18] Separate test_convert_path into two tests to avoid
 interactions in monkeypatching os.path.

---
 distutils/tests/test_util.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/distutils/tests/test_util.py b/distutils/tests/test_util.py
index c05df03a..434c9b80 100644
--- a/distutils/tests/test_util.py
+++ b/distutils/tests/test_util.py
@@ -65,15 +65,14 @@ def test_get_platform(self):
             with mock.patch.dict('os.environ', {'VSCMD_ARG_TGT_ARCH': 'arm64'}):
                 assert get_platform() == 'win-arm64'
 
-    def test_convert_path(self):
-        # linux/mac
+    def test_convert_path_unix(self):
         os.sep = '/'
         os.path.join = posixpath.join
 
         assert convert_path('/home/to/my/stuff') == '/home/to/my/stuff'
         assert convert_path(pathlib.Path('/home/to/my/stuff')) == '/home/to/my/stuff'
 
-        # win
+    def test_convert_path_windows(self):
         os.sep = '\\'
         os.path.join = ntpath.join
 

From 5469f24a5978acb5c7397a4b2e2b2ffd78c7c9e6 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sat, 20 Jul 2024 15:16:56 -0400
Subject: [PATCH 15/18] Remove expectation that a ValueError is raised for
 data_files being drive-relative absolute on Windows.

---
 distutils/tests/test_util.py | 5 -----
 distutils/util.py            | 2 --
 2 files changed, 7 deletions(-)

diff --git a/distutils/tests/test_util.py b/distutils/tests/test_util.py
index 434c9b80..16fcfe3e 100644
--- a/distutils/tests/test_util.py
+++ b/distutils/tests/test_util.py
@@ -76,11 +76,6 @@ def test_convert_path_windows(self):
         os.sep = '\\'
         os.path.join = ntpath.join
 
-        with pytest.raises(ValueError):
-            convert_path('/home/to/my/stuff')
-        with pytest.raises(ValueError):
-            convert_path(pathlib.Path('/home/to/my/stuff'))
-
         assert convert_path('home/to/my/stuff') == 'home\\to\\my\\stuff'
         assert convert_path(pathlib.Path('home/to/my/stuff')) == 'home\\to\\my\\stuff'
         assert convert_path('.') == os.curdir
diff --git a/distutils/util.py b/distutils/util.py
index 3163eb48..c7e73011 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -149,8 +149,6 @@ def make_native(pathname: str) -> str:
         return pathname
     if not pathname:
         return pathname
-    if pathname[0] == '/':
-        raise ValueError(f"path '{pathname}' cannot be absolute")
 
     paths = pathname.split('/')
     while '.' in paths:

From 28e7431142f4bc380518f4691076af2bd81222b7 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sat, 20 Jul 2024 15:33:26 -0400
Subject: [PATCH 16/18] Simplify convert_path by simply relying on the logic in
 PurePath.

Test for convert_path no longer runs on all operating systems as it's too difficult (impossible) to monkeypatch PurePath reliably.
---
 distutils/tests/test_util.py | 10 ++--------
 distutils/util.py            | 36 +++++++-----------------------------
 2 files changed, 9 insertions(+), 37 deletions(-)

diff --git a/distutils/tests/test_util.py b/distutils/tests/test_util.py
index 16fcfe3e..25e26e01 100644
--- a/distutils/tests/test_util.py
+++ b/distutils/tests/test_util.py
@@ -4,10 +4,8 @@
 import email.generator
 import email.policy
 import io
-import ntpath
 import os
 import pathlib
-import posixpath
 import sys
 import sysconfig as stdlib_sysconfig
 import unittest.mock as mock
@@ -65,17 +63,13 @@ def test_get_platform(self):
             with mock.patch.dict('os.environ', {'VSCMD_ARG_TGT_ARCH': 'arm64'}):
                 assert get_platform() == 'win-arm64'
 
+    @pytest.mark.skipif('platform.system() == "Windows"')
     def test_convert_path_unix(self):
-        os.sep = '/'
-        os.path.join = posixpath.join
-
         assert convert_path('/home/to/my/stuff') == '/home/to/my/stuff'
         assert convert_path(pathlib.Path('/home/to/my/stuff')) == '/home/to/my/stuff'
 
+    @pytest.mark.skipif('platform.system() != "Windows"')
     def test_convert_path_windows(self):
-        os.sep = '\\'
-        os.path.join = ntpath.join
-
         assert convert_path('home/to/my/stuff') == 'home\\to\\my\\stuff'
         assert convert_path(pathlib.Path('home/to/my/stuff')) == 'home\\to\\my\\stuff'
         assert convert_path('.') == os.curdir
diff --git a/distutils/util.py b/distutils/util.py
index c7e73011..4cc6bd28 100644
--- a/distutils/util.py
+++ b/distutils/util.py
@@ -122,43 +122,21 @@ def split_version(s):
 
 @pass_none
 def convert_path(pathname: str | os.PathLike) -> str:
-    """
-    Allow for pathlib.Path inputs, coax to posix, and then make native.
+    r"""
+    Allow for pathlib.Path inputs, coax to a native path string.
 
     If None is passed, will just pass it through as
     Setuptools relies on this behavior.
 
     >>> convert_path(None) is None
     True
-    """
-    # Use .as_posix() to retain forward slashes on Windows
-    # see https://github.com/pypa/distutils/pull/272#issuecomment-2240100013
-    return make_native(pathlib.Path(pathname).as_posix())
-
-
-def make_native(pathname: str) -> str:
-    """Return 'pathname' as a name that will work on the native filesystem,
-    i.e. split it on '/' and put it back together again using the current
-    directory separator.  Needed because filenames in the setup script are
-    always supplied in Unix style, and have to be converted to the local
-    convention before we can actually use them in the filesystem.  Raises
-    ValueError on non-Unix-ish systems if 'pathname' either starts or
-    ends with a slash.
-    """
-    if os.sep == '/':
-        return pathname
-    if not pathname:
-        return pathname
 
-    paths = pathname.split('/')
-    while '.' in paths:
-        paths.remove('.')
-    if not paths:
-        return os.curdir
-    return os.path.join(*paths)
+    Removes empty paths.
 
-
-# convert_path ()
+    >>> convert_path('foo/./bar').replace('\\', '/')
+    'foo/bar'
+    """
+    return os.fspath(pathlib.PurePath(pathname))
 
 
 def change_root(new_root, pathname):

From 8cada19d07e286558e5193841f66483f631170b3 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sat, 20 Jul 2024 15:43:45 -0400
Subject: [PATCH 17/18] Harmonize convert_path tests across Unix and Windows.

---
 distutils/tests/test_util.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/distutils/tests/test_util.py b/distutils/tests/test_util.py
index 25e26e01..d1254ca1 100644
--- a/distutils/tests/test_util.py
+++ b/distutils/tests/test_util.py
@@ -67,11 +67,12 @@ def test_get_platform(self):
     def test_convert_path_unix(self):
         assert convert_path('/home/to/my/stuff') == '/home/to/my/stuff'
         assert convert_path(pathlib.Path('/home/to/my/stuff')) == '/home/to/my/stuff'
+        assert convert_path('.') == os.curdir
 
     @pytest.mark.skipif('platform.system() != "Windows"')
     def test_convert_path_windows(self):
-        assert convert_path('home/to/my/stuff') == 'home\\to\\my\\stuff'
-        assert convert_path(pathlib.Path('home/to/my/stuff')) == 'home\\to\\my\\stuff'
+        assert convert_path('/home/to/my/stuff') == r'\home\to\my\stuff'
+        assert convert_path(pathlib.Path('/home/to/my/stuff')) == r'\home\to\my\stuff'
         assert convert_path('.') == os.curdir
 
     def test_change_root(self):

From 8f2498a1b072f3206b85f786016b9defbb4b796c Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sat, 20 Jul 2024 15:52:05 -0400
Subject: [PATCH 18/18] Consolidate convert_path tests and just generate the
 expected value in a platform-sensitive way. Should fix failures on mingw.

---
 distutils/tests/test_util.py | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/distutils/tests/test_util.py b/distutils/tests/test_util.py
index d1254ca1..00c9743e 100644
--- a/distutils/tests/test_util.py
+++ b/distutils/tests/test_util.py
@@ -63,16 +63,10 @@ def test_get_platform(self):
             with mock.patch.dict('os.environ', {'VSCMD_ARG_TGT_ARCH': 'arm64'}):
                 assert get_platform() == 'win-arm64'
 
-    @pytest.mark.skipif('platform.system() == "Windows"')
-    def test_convert_path_unix(self):
-        assert convert_path('/home/to/my/stuff') == '/home/to/my/stuff'
-        assert convert_path(pathlib.Path('/home/to/my/stuff')) == '/home/to/my/stuff'
-        assert convert_path('.') == os.curdir
-
-    @pytest.mark.skipif('platform.system() != "Windows"')
-    def test_convert_path_windows(self):
-        assert convert_path('/home/to/my/stuff') == r'\home\to\my\stuff'
-        assert convert_path(pathlib.Path('/home/to/my/stuff')) == r'\home\to\my\stuff'
+    def test_convert_path(self):
+        expected = os.sep.join(('', 'home', 'to', 'my', 'stuff'))
+        assert convert_path('/home/to/my/stuff') == expected
+        assert convert_path(pathlib.Path('/home/to/my/stuff')) == expected
         assert convert_path('.') == os.curdir
 
     def test_change_root(self):