Allow custom subpackage names in built wheels

src/poetry/core/json/schemas/poetry-schema.json

@@ -94,6 +94,10 @@
           },
           "format": {
             "$ref": "#/definitions/package-formats"
+          },
+          "to": {
+            "type": "string",
+            "description": "Where the package should be installed in the final distribution."
           }
         }
       }

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

@@ -180,13 +180,23 @@ def find_files_to_add(self, exclude_build: bool = True) -> set[BuildIncludeFile]
                 else:
                     source_root = self._path
 
+                if (
+                    isinstance(include, PackageInclude)
+                    and include.target
+                    and self.format == "wheel"
+                ):
+                    target_dir = include.target
+                else:
+                    target_dir = None
+
                 if file.is_dir():
                     if self.format in formats:
                         for current_file in file.glob("**/*"):
                             include_file = BuildIncludeFile(
                                 path=current_file,
                                 project_root=self._path,
                                 source_root=source_root,
+                                target_dir=target_dir,
                             )
 
                             if not (
@@ -199,7 +209,10 @@ def find_files_to_add(self, exclude_build: bool = True) -> set[BuildIncludeFile]
                     continue
 
                 include_file = BuildIncludeFile(
-                    path=file, project_root=self._path, source_root=source_root
+                    path=file,
+                    project_root=self._path,
+                    source_root=source_root,
+                    target_dir=target_dir,
                 )
 
                 if self.is_excluded(
@@ -220,6 +233,7 @@ def find_files_to_add(self, exclude_build: bool = True) -> set[BuildIncludeFile]
                     path=self._package.build_script,
                     project_root=self._path,
                     source_root=self._path,
+                    target_dir=self._path,
                 )
             )
 
@@ -368,6 +382,7 @@ def __init__(
         path: Path | str,
         project_root: Path | str,
         source_root: Path | str | None = None,
+        target_dir: Path | str | None = None,
     ) -> None:
         """
         :param project_root: the full path of the project's root
@@ -377,6 +392,7 @@ def __init__(
         self.path = Path(path)
         self.project_root = Path(project_root).resolve()
         self.source_root = None if not source_root else Path(source_root).resolve()
+        self.target_dir = None if not target_dir else Path(target_dir)
         if not self.path.is_absolute() and self.source_root:
             self.path = self.source_root / self.path
         else:
@@ -404,3 +420,12 @@ def relative_to_source_root(self) -> Path:
             return self.path.relative_to(self.source_root)
 
         return self.path
+
+    def concatenation_target_dir_relative_to_source_root(self) -> Path:
+        if self.source_root is not None and self.target_dir is not None:
+            return self.target_dir / self.path.relative_to(self.source_root)
+
+        elif self.source_root is not None:
+            return self.path.relative_to(self.source_root)
+
+        return self.path

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

@@ -267,7 +267,11 @@ def _copy_module(self, wheel: zipfile.ZipFile) -> None:
         # Walk the files and compress them,
         # sorting everything so the order is stable.
         for file in sorted(to_add, key=lambda x: x.path):
-            self._add_file(wheel, file.path, file.relative_to_source_root())
+            self._add_file(
+                wheel,
+                file.path,
+                file.concatenation_target_dir_relative_to_source_root(),
+            )
 
     def prepare_metadata(self, metadata_directory: Path) -> Path:
         dist_info = metadata_directory / self.dist_info

src/poetry/core/masonry/utils/module.py

@@ -81,6 +81,7 @@ def __init__(
                     package["include"],
                     formats=formats,
                     source=package.get("from"),
+                    target=package.get("to"),
                 )
             )
 

src/poetry/core/masonry/utils/package_include.py

@@ -16,11 +16,13 @@ def __init__(
         include: str,
         formats: list[str] | None = None,
         source: str | None = None,
+        target: str | None = None,
     ) -> None:
         self._package: str
         self._is_package = False
         self._is_module = False
         self._source = source
+        self._target = target
 
         if source is not None:
             base = base / source
@@ -36,6 +38,10 @@ def package(self) -> str:
     def source(self) -> str | None:
         return self._source
 
+    @property
+    def target(self) -> str | None:
+        return self._target
+
     def is_package(self) -> bool:
         return self._is_package
 

tests/masonry/builders/fixtures/with-include/pyproject.toml

@@ -28,6 +28,7 @@ packages = [
     { include = "tests", format = "sdist" },
     { include = "for_wheel_only", format = ["wheel"] },
     { include = "src_package", from = "src"},
+    { include = "from_to", from = "etc", "to" = "target"},
 ]
 
 include = [

tests/masonry/builders/test_complete.py

@@ -321,6 +321,7 @@ def test_package_with_include(mocker: MockerFixture) -> None:
         assert "with_include-1.2.3/PKG-INFO" in names
         assert "with_include-1.2.3/for_wheel_only/__init__.py" not in names
         assert "with_include-1.2.3/src/src_package/__init__.py" in names
+        assert "with_include-1.2.3/etc/from_to/__init__.py" in names
 
     whl = module_path / "dist" / "with_include-1.2.3-py3-none-any.whl"
 
@@ -340,6 +341,7 @@ def test_package_with_include(mocker: MockerFixture) -> None:
         assert "package_with_include/__init__.py" in names
         assert "tests/__init__.py" not in names
         assert "src_package/__init__.py" in names
+        assert "target/from_to/__init__.py" in names
 
 
 def test_respect_format_for_explicit_included_files() -> None:

tests/test_factory.py

@@ -217,6 +217,7 @@ def test_create_poetry_with_packages_and_includes() -> None:
         {"include": "tests", "format": "sdist"},
         {"include": "for_wheel_only", "format": ["wheel"]},
         {"include": "src_package", "from": "src"},
+        {"include": "from_to", "from": "etc", "to": "target"},
     ]
 
     assert package.include == [