fix(inspect): ignore non-package top-level dirs in sdist site_paths

pycross/private/tools/inspect_package.py

@@ -425,6 +425,13 @@ def read_file(path: str) -> Optional[str]:
                 declared.add(name)
         return sorted(declared)
 
+    def _has_python(d: str) -> bool:
+        prefix = d + "/"
+        return any(f.startswith(prefix) and _extract_module_name(f.rsplit("/", 1)[1]) for f in all_files)
+
+    # An sdist's top-level dirs are only a guess at what the built wheel installs; a dir with
+    # no Python anywhere below it (.github/, requirements/, licenses/) can't be an import package.
+    top_level_dirs = {d for d in top_level_dirs if d.isidentifier() and _has_python(d)}
     pkgs = _resolve_top_level_paths(all_files, top_level_dirs, read_file)
     for f in root_files:
         name = _extract_module_name(f)

tests/unit/inspect_package_test.py

@@ -258,6 +258,31 @@ def test_sdist_no_init_py(self):
         result = inspect_sdist(sdist_path)
         self.assertEqual(result["site_paths"], [])
 
+    def test_sdist_ignores_non_package_top_level_dirs(self):
+        """Top-level sdist directories without Python modules (.github/, requirements/) are ignored."""
+        sdist_path = self._create_tarball_with_dirs(
+            "packaging-23.2.tar.gz",
+            {
+                "packaging-23.2/.github/workflows/x.yml": "name: ci\n",
+                "packaging-23.2/requirements/base.txt": "pytest\n",
+                "packaging-23.2/packaging/__init__.py": "",
+            },
+        )
+        result = inspect_sdist(sdist_path)
+        self.assertEqual(result["site_paths"], ["packaging"])
+
+    def test_sdist_namespace_keeps_data_files_when_python_present(self):
+        """Data files inside a namespace directory that also contains Python modules are kept."""
+        sdist_path = self._create_tarball_with_dirs(
+            "ns-pkg-1.0.tar.gz",
+            {
+                "ns-pkg-1.0/myns/helper.py": "# module\n",
+                "ns-pkg-1.0/myns/py.typed": "",
+            },
+        )
+        result = inspect_sdist(sdist_path)
+        self.assertEqual(result["site_paths"], ["myns/helper.py", "myns/py.typed"])
+
     def test_sdist_top_level_paths_pth(self):
         sdist_path = self._create_tarball_with_dirs(
             "rerun_sdk-1.0.tar.gz",