fix sdist build for multiple readme files

Author: wagnerluis1982

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

@@ -328,9 +328,9 @@ def find_files_to_add(self, exclude_build: bool = False) -> set[BuildIncludeFile
         # Include project files
         additional_files.add(Path("pyproject.toml"))
 
-        # add readme if it is specified
+        # add readme files if it is specified
         if "readme" in self._poetry.local_config:
-            additional_files.add(self._poetry.local_config["readme"])
+            additional_files.update(self._poetry.local_config["readme"])
 
         for additional_file in additional_files:
             file = BuildIncludeFile(

src/poetry/core/poetry.py

@@ -25,6 +25,10 @@ def __init__(
         self._package = package
         self._local_config = local_config
 
+        # readme entry must be a sequence: turns to 1-element tuple if not
+        if isinstance(local_config.get("readme"), str):
+            local_config["readme"] = (local_config.get("readme"),)
+
     @property
     def pyproject(self) -> PyProjectTOML:
         return self._pyproject

tests/masonry/builders/test_sdist.py

@@ -191,6 +191,24 @@ def test_find_files_to_add() -> None:
     )
 
 
+def test_find_files_to_add_with_multiple_readme_files() -> None:
+    poetry = Factory().create_poetry(
+        Path(__file__).parent.parent.parent / "fixtures" / "with_readme_files"
+    )
+
+    builder = SdistBuilder(poetry)
+    result = [f.relative_to_source_root() for f in builder.find_files_to_add()]
+
+    assert sorted(result) == sorted(
+        [
+            Path("README-1.rst"),
+            Path("README-2.rst"),
+            Path("my_package/__init__.py"),
+            Path("pyproject.toml"),
+        ]
+    )
+
+
 def test_make_pkg_info_multi_constraints_dependency() -> None:
     poetry = Factory().create_poetry(
         Path(__file__).parent.parent.parent