feat: respect metadata_directory (#487)

From [PEP 517]:

> If the build frontend has previously called prepare_metadata_for_build_wheel
> and depends on the wheel resulting from this call to have metadata matching
> this earlier call, then it should provide the path to the created .dist-info
> directory as the metadata_directory argument. If this argument is provided,
> then build_wheel MUST produce a wheel with identical metadata. The directory
> passed in by the build frontend MUST be identical to the directory created by
> prepare_metadata_for_build_wheel, including any unrecognized files it created.

  [PEP 517]: https://peps.python.org/pep-0517/#build-wheel

src/poetry/core/masonry/api.py

@@ -39,20 +39,8 @@ def prepare_metadata_for_build_wheel(
 ) -> str:
     poetry = Factory().create_poetry(Path(".").resolve(), with_groups=False)
     builder = WheelBuilder(poetry)
-
-    dist_info = Path(metadata_directory, builder.dist_info)
-    dist_info.mkdir(parents=True, exist_ok=True)
-
-    if "scripts" in poetry.local_config or "plugins" in poetry.local_config:
-        with (dist_info / "entry_points.txt").open("w", encoding="utf-8") as f:
-            builder._write_entry_points(f)
-
-    with (dist_info / "WHEEL").open("w", encoding="utf-8") as f:
-        builder._write_wheel_file(f)
-
-    with (dist_info / "METADATA").open("w", encoding="utf-8") as f:
-        builder._write_metadata_file(f)
-
+    metadata_path = Path(metadata_directory)
+    dist_info = builder.prepare_metadata(metadata_path)
     return dist_info.name
 
 
@@ -63,8 +51,11 @@ def build_wheel(
 ) -> str:
     """Builds a wheel, places it in wheel_directory"""
     poetry = Factory().create_poetry(Path(".").resolve(), with_groups=False)
+    metadata_path = None if metadata_directory is None else Path(metadata_directory)
 
-    return WheelBuilder.make_in(poetry, Path(wheel_directory))
+    return WheelBuilder.make_in(
+        poetry, Path(wheel_directory), metadata_directory=metadata_path
+    )
 
 
 def build_sdist(

src/poetry/core/masonry/builders/wheel.py

@@ -27,6 +27,7 @@
 from poetry.core.masonry.utils.helpers import distribution_name
 from poetry.core.masonry.utils.helpers import normalize_file_permissions
 from poetry.core.masonry.utils.package_include import PackageInclude
+from poetry.core.utils.helpers import temporary_directory
 
 
 if TYPE_CHECKING:
@@ -53,6 +54,7 @@ def __init__(
         original: Path | None = None,
         executable: Path | None = None,
         editable: bool = False,
+        metadata_directory: Path | None = None,
     ) -> None:
         super().__init__(poetry, executable=executable)
 
@@ -61,6 +63,7 @@ def __init__(
         if original:
             self._original_path = original.parent
         self._editable = editable
+        self._metadata_directory = metadata_directory
 
     @classmethod
     def make_in(
@@ -70,12 +73,14 @@ def make_in(
         original: Path | None = None,
         executable: Path | None = None,
         editable: bool = False,
+        metadata_directory: Path | None = None,
     ) -> str:
         wb = WheelBuilder(
             poetry,
             original=original,
             executable=executable,
             editable=editable,
+            metadata_directory=metadata_directory,
         )
         wb.build(target_dir=directory)
 
@@ -105,19 +110,25 @@ def build(
         with os.fdopen(fd, "w+b") as fd_file, zipfile.ZipFile(
             fd_file, mode="w", compression=zipfile.ZIP_DEFLATED
         ) as zip_file:
-            if not self._editable:
-                if not self._poetry.package.build_should_generate_setup():
-                    self._build(zip_file)
-                    self._copy_module(zip_file)
-                else:
-                    self._copy_module(zip_file)
-                    self._build(zip_file)
-            else:
+            if self._editable:
                 self._build(zip_file)
                 self._add_pth(zip_file)
+            elif self._poetry.package.build_should_generate_setup():
+                self._copy_module(zip_file)
+                self._build(zip_file)
+            else:
+                self._build(zip_file)
+                self._copy_module(zip_file)
 
             self._copy_file_scripts(zip_file)
-            self._write_metadata(zip_file)
+
+            if self._metadata_directory is None:
+                with temporary_directory() as temp_dir:
+                    metadata_directory = self.prepare_metadata(Path(temp_dir))
+                    self._copy_dist_info(zip_file, metadata_directory)
+            else:
+                self._copy_dist_info(zip_file, self._metadata_directory)
+
             self._write_record(zip_file)
 
         wheel_path = target_dir / self.wheel_filename
@@ -225,33 +236,42 @@ def _copy_module(self, wheel: zipfile.ZipFile) -> None:
         for file in sorted(to_add, key=lambda x: x.path):
             self._add_file(wheel, file.path, file.relative_to_source_root())
 
-    def _write_metadata(self, wheel: zipfile.ZipFile) -> None:
+    def prepare_metadata(self, metadata_directory: Path) -> Path:
+        dist_info = metadata_directory / self.dist_info
+        dist_info.mkdir(parents=True, exist_ok=True)
+
         if (
             "scripts" in self._poetry.local_config
             or "plugins" in self._poetry.local_config
         ):
-            with self._write_to_zip(wheel, self.dist_info + "/entry_points.txt") as f:
+            with (dist_info / "entry_points.txt").open(
+                "w", encoding="utf-8", newline="\n"
+            ) as f:
                 self._write_entry_points(f)
 
-        license_files_to_add = []
+        with (dist_info / "WHEEL").open("w", encoding="utf-8", newline="\n") as f:
+            self._write_wheel_file(f)
+
+        with (dist_info / "METADATA").open("w", encoding="utf-8", newline="\n") as f:
+            self._write_metadata_file(f)
+
+        license_files = set()
         for base in ("COPYING", "LICENSE"):
-            license_files_to_add.append(self._path / base)
-            license_files_to_add.extend(self._path.glob(base + ".*"))
+            license_files.add(self._path / base)
+            license_files.update(self._path.glob(base + ".*"))
 
-        license_files_to_add.extend(self._path.joinpath("LICENSES").glob("**/*"))
+        license_files.update(self._path.joinpath("LICENSES").glob("**/*"))
 
-        for path in set(license_files_to_add):
-            if path.is_file():
-                relative_path = f"{self.dist_info}/{path.relative_to(self._path)}"
-                self._add_file(wheel, path, relative_path)
-            else:
-                logger.debug(f"Skipping: {path.as_posix()}")
+        for license_file in license_files:
+            if not license_file.is_file():
+                logger.debug(f"Skipping: {license_file.as_posix()}")
+                continue
 
-        with self._write_to_zip(wheel, self.dist_info + "/WHEEL") as f:
-            self._write_wheel_file(f)
+            dest = dist_info / license_file.relative_to(self._path)
+            os.makedirs(dest.parent, exist_ok=True)
+            shutil.copy(license_file, dest)
 
-        with self._write_to_zip(wheel, self.dist_info + "/METADATA") as f:
-            self._write_metadata_file(f)
+        return dist_info
 
     def _write_record(self, wheel: zipfile.ZipFile) -> None:
         # Write a record of the files in the wheel
@@ -272,6 +292,16 @@ def _write_record(self, wheel: zipfile.ZipFile) -> None:
 
             f.write(record.getvalue())
 
+    def _copy_dist_info(self, wheel: zipfile.ZipFile, source: Path) -> None:
+        dist_info = Path(self.dist_info)
+        for file in source.glob("**/*"):
+            if not file.is_file():
+                continue
+
+            rel_path = file.relative_to(source)
+            target = dist_info / rel_path
+            self._add_file(wheel, file, target)
+
     @property
     def dist_info(self) -> str:
         return self.dist_info_name(self._package.name, self._meta.version)

tests/masonry/builders/test_wheel.py

@@ -180,17 +180,20 @@ def test_dist_info_file_permissions() -> None:
 
     with zipfile.ZipFile(str(whl)) as z:
         assert (
-            z.getinfo("my_package-1.2.3.dist-info/WHEEL").external_attr == 0o644 << 16
+            z.getinfo("my_package-1.2.3.dist-info/WHEEL").external_attr & 0x1FF0000
+            == 0o644 << 16
         )
         assert (
-            z.getinfo("my_package-1.2.3.dist-info/METADATA").external_attr
+            z.getinfo("my_package-1.2.3.dist-info/METADATA").external_attr & 0x1FF0000
             == 0o644 << 16
         )
         assert (
-            z.getinfo("my_package-1.2.3.dist-info/RECORD").external_attr == 0o644 << 16
+            z.getinfo("my_package-1.2.3.dist-info/RECORD").external_attr & 0x1FF0000
+            == 0o644 << 16
         )
         assert (
             z.getinfo("my_package-1.2.3.dist-info/entry_points.txt").external_attr
+            & 0x1FF0000
             == 0o644 << 16
         )
 

tests/masonry/test_api.py

@@ -235,3 +235,22 @@ def test_build_editable_wheel() -> None:
 
             assert "my_package.pth" in namelist
             assert pkg_dir.as_posix() == z.read("my_package.pth").decode().strip()
+
+
+def test_build_wheel_with_metadata_directory() -> None:
+    with temporary_directory() as metadata_tmp_dir, cwd(
+        os.path.join(fixtures, "complete")
+    ):
+        metadata_directory = api.prepare_metadata_for_build_wheel(metadata_tmp_dir)
+
+        with temporary_directory() as wheel_tmp_dir:
+            dist_info_path = Path(metadata_tmp_dir) / metadata_directory
+            filename = api.build_wheel(
+                wheel_tmp_dir, metadata_directory=str(dist_info_path)
+            )
+            validate_wheel_contents(
+                name="my_package",
+                version="1.2.3",
+                path=str(os.path.join(wheel_tmp_dir, filename)),
+                files=["entry_points.txt"],
+            )