fix(conda): read conda-forge's CFEP-27 Windows layout in the smoke check (#2126)

tests/project/test_conda_windows_leg_2060.py

@@ -18,7 +18,8 @@
   previous ``FOR`` loop wrote ``%A``, a syntax error in a batch file.
 * :class:`TestPortableExecutable` and :class:`TestTheWindowsLayout`:
   :file:`util/conda_vendor.py` reads a ``.pyd``'s PE machine, and ``--smoke``
-  takes a Windows package's ``Lib/site-packages``, whose path names no Python.
+  takes a Windows package's ``Lib/site-packages``, or from Python 3.15 its
+  ``lib/python/site-packages`` (conda-forge's CFEP-27), whose path names no Python.
 
 Nothing here runs on Windows; what a real Conda Update run shows is the rest.
 
@@ -318,14 +319,25 @@ def test_the_python_is_read_from_the_build_string(self) -> None:
         posix = pathlib.Path('root') / 'lib' / 'python3.14' / 'site-packages'
         self.assertEqual(vendor.built_for(posix, {'build': 'py39_0'}), 'python3.14')
 
-    def smoke(self, build: 'str') -> 'tuple[int, str]':
+    def test_the_cfep_27_layout_is_read_from_the_build_string(self) -> None:
+        """conda-forge's Python 3.15 on Windows has ``lib/python/site-packages``, naming no version."""
+        vendor = load('conda_vendor')
+        site = pathlib.Path('root') / 'lib' / 'python' / 'site-packages'
+        self.assertEqual(vendor.built_for(site, {'build': 'py315_0'}), 'python3.15')
+        self.assertEqual(vendor.built_for(site, {'build': 'h1a2b3c4_0'}),
+                         "lib/python/site-packages with build string 'h1a2b3c4_0'")
+        # Only under lib: anything else named python is not the layout.
+        other = pathlib.Path('root') / 'opt' / 'python' / 'site-packages'
+        self.assertEqual(vendor.built_for(other, {'build': 'py315_0'}), 'python')
+
+    def smoke(self, build: 'str', site: 'str' = 'Lib/site-packages') -> 'tuple[int, str]':
         vendor = load('conda_vendor')
         files = dict({'pcapkit/__init__.py': SHIM.encode()}, **DISTRIBUTION)
         files['pcapkit/_extern/native/_speedups.pyd'] = pe(0x8664)
         files['pcapkit/_extern/native-1.0.dist-info/RECORD'] = (
             b'native/__init__.py,,\nnative/_speedups.pyd,,\nnative-1.0.dist-info/METADATA,,\n'
             b'native-1.0.dist-info/RECORD,,\n')
-        members = {f'Lib/site-packages/{name}': data for name, data in files.items()}
+        members = {f'{site}/{name}': data for name, data in files.items()}
         members['info/index.json'] = json.dumps({'name': 'pypcapkit', 'subdir': 'win-64', 'build': build}).encode()
         with tempfile.TemporaryDirectory() as temp:
             package = pathlib.Path(temp) / 'pypcapkit-0-py_0.tar.bz2'
@@ -347,6 +359,11 @@ def test_a_windows_package_for_this_python_passes(self) -> None:
         self.assertEqual(status, 0, log)
         self.assertIn('win-64: 1 native binaries read, none failing', log)
 
+    def test_a_cfep_27_windows_package_for_this_python_passes(self) -> None:
+        status, log = self.smoke(f'py{self.PYTHON.replace(".", "")}h0_0', site='lib/python/site-packages')
+        self.assertEqual(status, 0, log)
+        self.assertIn('win-64: 1 native binaries read, none failing', log)
+
     def test_a_windows_package_for_another_python_fails(self) -> None:
         status, log = self.smoke('py27_0')
         self.assertEqual(status, 1, log)

util/conda_vendor.py

@@ -906,19 +906,26 @@ def runner_platform() -> 'Optional[str]':
                 None)
 
 
+#: The ``site-packages`` of a Windows package, which names no Python: conda-forge's
+#: up to 3.14, and its CFEP-27 one from 3.15 on.
+WINDOWS_SITES = (('Lib', 'site-packages'), ('lib', 'python', 'site-packages'))
+
+
 def built_for(site: 'pathlib.Path', index: 'dict[str, Any]') -> 'str':
     """The ``pythonX.Y`` a package's ``site-packages`` at ``site`` is for, or what it is if not that.
 
     A POSIX package names it in the path, ``lib/pythonX.Y/site-packages``. A
-    Windows one has ``Lib/site-packages`` for every version (#2060), so it is read
+    Windows one does not (#2060): ``Lib/site-packages`` up to 3.14, and from 3.15
+    ``lib/python/site-packages``, conda-forge's CFEP-27 layout. So that is read
     from the ``pyXY`` that starts the build string in ``info/index.json``.
 
     """
-    if site.parent.name != 'Lib':
+    layout = next((parts for parts in WINDOWS_SITES if site.parts[-len(parts):] == parts), None)
+    if layout is None:
         return site.parent.name
     match = re.match(r'py(\d)(\d+)(?![0-9])', str(index.get('build', '')))
     if match is None:
-        return f'Lib/site-packages with build string {index.get("build")!r}'
+        return f'{"/".join(layout)} with build string {index.get("build")!r}'
     return f'python{match.group(1)}.{match.group(2)}'