Merge pull request #122 from kurtmckee/fix-poetry-3545

Always close the wheel tempfile after writing to it

poetry/core/masonry/builders/wheel.py

@@ -78,18 +78,19 @@ def build(self):
         new_mode = normalize_file_permissions(st_mode)
         os.chmod(temp_path, new_mode)
 
-        with zipfile.ZipFile(
-            os.fdopen(fd, "w+b"), mode="w", compression=zipfile.ZIP_DEFLATED
-        ) as zip_file:
-            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)
-
-            self._write_metadata(zip_file)
-            self._write_record(zip_file)
+        with os.fdopen(fd, "w+b") as fd_file:
+            with zipfile.ZipFile(
+                fd_file, mode="w", compression=zipfile.ZIP_DEFLATED
+            ) as zip_file:
+                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)
+
+                self._write_metadata(zip_file)
+                self._write_record(zip_file)
 
         wheel_path = dist_dir / self.wheel_filename
         if wheel_path.exists():

tests/masonry/builders/test_wheel.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import os
 import shutil
 import zipfile
 
@@ -284,3 +285,24 @@ def test_default_src_with_excluded_data(mocker):
         assert "my_package/data/data1.txt" in names
         assert "my_package/data/sub_data/data2.txt" not in names
         assert "my_package/data/sub_data/data3.txt" in names
+
+
+def test_wheel_file_is_closed(monkeypatch):
+    """Confirm that wheel zip files are explicitly closed."""
+
+    # Using a list is a hack for Python 2.7 compatibility.
+    fd_file = [None]
+
+    real_fdopen = os.fdopen
+
+    def capturing_fdopen(*args, **kwargs):
+        fd_file[0] = real_fdopen(*args, **kwargs)
+        return fd_file[0]
+
+    monkeypatch.setattr(os, "fdopen", capturing_fdopen)
+
+    module_path = fixtures_dir / "module1"
+    WheelBuilder.make(Factory().create_poetry(module_path))
+
+    assert fd_file[0] is not None
+    assert fd_file[0].closed