Fix the wheel target for case insensitive file systems

backend/src/hatchling/builders/wheel.py

@@ -4,6 +4,7 @@
 import hashlib
 import os
 import stat
+import sys
 import tempfile
 import zipfile
 from io import StringIO
@@ -178,15 +179,19 @@ def set_default_file_selection(self) -> None:
             self.builder.normalize_file_name_component(self.builder.metadata.core.name),
         ):
             if os.path.isfile(os.path.join(self.root, project_name, '__init__.py')):
-                self.__packages.append(project_name)
+                normalized_project_name = self.get_raw_fs_path_name(self.root, project_name)
+                self.__packages.append(normalized_project_name)
                 break
 
             if os.path.isfile(os.path.join(self.root, 'src', project_name, '__init__.py')):
-                self.__packages.append(f'src/{project_name}')
+                normalized_project_name = self.get_raw_fs_path_name(os.path.join(self.root, 'src'), project_name)
+                self.__packages.append(f'src/{normalized_project_name}')
                 break
 
-            if os.path.isfile(os.path.join(self.root, f'{project_name}.py')):
-                self.__only_include.append(f'{project_name}.py')
+            module_file = f'{project_name}.py'
+            if os.path.isfile(os.path.join(self.root, module_file)):
+                normalized_project_name = self.get_raw_fs_path_name(self.root, module_file)
+                self.__only_include.append(module_file)
                 break
 
             from glob import glob
@@ -344,6 +349,24 @@ def macos_max_compat(self) -> bool:
 
         return self.__macos_max_compat
 
+    if sys.platform in {'darwin', 'win32'}:
+
+        @staticmethod
+        def get_raw_fs_path_name(directory: str, name: str) -> str:
+            normalized = name.casefold()
+            entries = os.listdir(directory)
+            for entry in entries:
+                if entry.casefold() == normalized:
+                    return entry
+
+            return name  # no cov
+
+    else:
+
+        @staticmethod
+        def get_raw_fs_path_name(directory: str, name: str) -> str:  # noqa: ARG004
+            return name
+
 
 class WheelBuilder(BuilderInterface):
     """

docs/history/hatchling.md

@@ -21,6 +21,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Fix parsing dependencies for environments when warnings are emitted
 - Properly handle non-zero version epoch for the `standard` version scheme
 - Allow using an empty string for the `sources` option to add a prefix to distribution paths
+- Fix the `wheel` target for case insensitive file systems when the project metadata name does not match the directory name on disk
 
 ## [1.18.0](https://github.com/pypa/hatch/releases/tag/hatchling-v1.18.0) - 2023-06-12 ## {: #hatchling-v1.18.0 }
 

tests/backend/builders/test_wheel.py

@@ -121,7 +121,7 @@ def test_default(self, temp_dir):
         assert builder.config.default_packages() == []
         assert builder.config.default_only_include() == []
 
-    def test_raw_name_not_normalized(self, temp_dir):
+    def test_unnormalized_name_with_unnormalized_directory(self, temp_dir):
         config = {'project': {'name': 'MyApp', 'version': '0.0.1'}}
         builder = WheelBuilder(str(temp_dir), config=config)
 
@@ -131,6 +131,16 @@ def test_raw_name_not_normalized(self, temp_dir):
 
         assert builder.config.default_packages() == ['src/MyApp']
 
+    def test_unnormalized_name_with_normalized_directory(self, temp_dir):
+        config = {'project': {'name': 'MyApp', 'version': '0.0.1'}}
+        builder = WheelBuilder(str(temp_dir), config=config)
+
+        src_root = temp_dir / 'src' / 'myapp' / '__init__.py'
+        src_root.ensure_parent_dir_exists()
+        src_root.touch()
+
+        assert builder.config.default_packages() == ['src/myapp']
+
 
 class TestCoreMetadataConstructor:
     def test_default(self, isolation):