Preserve split package metadata in sdists

README.md

@@ -23,8 +23,11 @@ dynamic = ["dependencies"]
 main = [...]
 other = [...]
 
-[tool.hatch.metadata.hooks.multi]
+[tool.hatch.metadata.hooks.hatch-multi]
 primary = "main"
+
+# Required for split sdists to retain their package name when installed.
+[tool.hatch.build.targets.sdist.hooks.hatch-multi]
 ```
 
 ```bash

hatch_multi/__init__.py

@@ -1,5 +1,5 @@
 __version__ = "1.0.0"
 
-from .hooks import hatch_register_metadata_hook
-from .plugin import HatchMultiMetadataHook
+from .hooks import hatch_register_build_hook, hatch_register_metadata_hook
+from .plugin import HatchMultiBuildHook, HatchMultiMetadataHook
 from .structs import *

hatch_multi/hooks.py

@@ -1,6 +1,11 @@
 from hatchling.plugin import hookimpl
 
-from .plugin import HatchMultiMetadataHook
+from .plugin import HatchMultiBuildHook, HatchMultiMetadataHook
+
+
+@hookimpl
+def hatch_register_build_hook() -> type[HatchMultiBuildHook]:
+    return HatchMultiBuildHook
 
 
 @hookimpl

hatch_multi/plugin.py

@@ -1,18 +1,64 @@
 from __future__ import annotations
 
+from json import dumps
 from logging import getLogger
 from os import getenv
+from pathlib import Path
+from tempfile import NamedTemporaryFile
 
+from hatchling.builders.hooks.plugin.interface import BuildHookInterface
 from hatchling.metadata.plugin.interface import MetadataHookInterface
 
 from .structs import HatchMultiConfig
 
-__all__ = ("HatchMultiMetadataHook",)
+__all__ = ("HatchMultiBuildHook", "HatchMultiMetadataHook")
 
 
-class HatchMultiMetadataHook(MetadataHookInterface):
+class HatchMultiBuildHook(BuildHookInterface):
     """The hatch-multi build hook."""
 
+    PLUGIN_NAME = "hatch-multi"
+    _temporary_project_file: Path | None = None
+
+    def initialize(self, version: str, build_data: dict) -> None:
+        if self.target_name != "sdist":
+            return
+
+        configured_name = self.metadata.config["project"]["name"]
+        package_name = self.metadata.core.raw_name
+        if package_name == configured_name:
+            return
+
+        project_file = Path(self.root, "pyproject.toml")
+        lines = project_file.read_text(encoding="utf-8").splitlines(keepends=True)
+        in_project_table = False
+        for index, line in enumerate(lines):
+            stripped_line = line.strip()
+            if stripped_line.startswith("[") and stripped_line.endswith("]"):
+                in_project_table = stripped_line == "[project]"
+            elif in_project_table:
+                key, separator, _value = line.partition("=")
+                if separator and key.strip() == "name":
+                    newline = "\n" if line.endswith("\n") else ""
+                    lines[index] = f"{key}= {dumps(package_name)}{newline}"
+                    break
+
+        with NamedTemporaryFile(mode="w", encoding="utf-8", suffix=".toml", delete=False) as temporary_project_file:
+            temporary_project_file.writelines(lines)
+            self._temporary_project_file = Path(temporary_project_file.name)
+
+        build_data["force_include"].pop(str(project_file), None)
+        build_data["force_include"][str(self._temporary_project_file)] = "pyproject.toml"
+
+    def finalize(self, version: str, build_data: dict, artifact_path: str) -> None:
+        if self._temporary_project_file is not None:
+            self._temporary_project_file.unlink()
+            self._temporary_project_file = None
+
+
+class HatchMultiMetadataHook(MetadataHookInterface):
+    """The hatch-multi metadata hook."""
+
     PLUGIN_NAME = "hatch-multi"
     _logger = getLogger(__name__)
 

hatch_multi/tests/test_project_basic/pyproject.toml

@@ -24,3 +24,5 @@ packages = ["project"]
 
 [tool.hatch.metadata.hooks.hatch-multi]
 primary = "main"
+
+[tool.hatch.build.targets.sdist.hooks.hatch-multi]

hatch_multi/tests/test_project_multiple_primary/pyproject.toml

@@ -24,3 +24,5 @@ packages = ["project"]
 
 [tool.hatch.metadata.hooks.hatch-multi]
 default = ["main", "other"]
+
+[tool.hatch.build.targets.sdist.hooks.hatch-multi]

hatch_multi/tests/test_projects_basic.py

@@ -3,6 +3,7 @@
 from shutil import rmtree
 from subprocess import check_call
 from sys import executable
+from tarfile import TarFile
 from zipfile import ZipFile
 
 
@@ -105,3 +106,48 @@ def test_basic():
 """
     )
     rmtree(f"hatch_multi/tests/{project}/dist")
+
+
+def test_sdist_preserves_extra():
+    project = "test_project_basic"
+    project_root = Path(f"hatch_multi/tests/{project}")
+    rmtree(project_root / "dist", ignore_errors=True)
+
+    check_call(
+        [
+            executable,
+            "-m",
+            "build",
+            "-n",
+            "-s",
+        ],
+        cwd=project_root,
+        env={"HATCH_MULTI_BUILD": "other"},
+    )
+
+    sdist_name = "hatch_cpp_test_project_basic_other-0.1.0.tar.gz"
+    assert listdir(project_root / "dist") == [sdist_name]
+    with TarFile.open(project_root / "dist" / sdist_name, "r:gz") as tar_file:
+        tar_file.extractall(project_root / "dist" / "extracted", filter="data")
+
+    source_root = project_root / "dist" / "extracted" / "hatch_cpp_test_project_basic_other-0.1.0"
+    check_call(
+        [
+            executable,
+            "-m",
+            "build",
+            "-n",
+            "-w",
+        ],
+        cwd=source_root,
+        env={},
+    )
+
+    wheel_name = "hatch_cpp_test_project_basic_other-0.1.0-py3-none-any.whl"
+    assert listdir(source_root / "dist") == [wheel_name]
+    with ZipFile(source_root / "dist" / wheel_name) as zip_file:
+        metadata = zip_file.read("hatch_cpp_test_project_basic_other-0.1.0.dist-info/METADATA").decode()
+
+    assert "Name: hatch-cpp-test-project-basic-other\n" in metadata
+    assert "Requires-Dist: organizeit2\n" in metadata
+    rmtree(project_root / "dist")