GH-126606: don't write incomplete pyc files (GH-126627)

Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
Co-authored-by: Brett Cannon <brett@python.org>

Lib/test/test_importlib/test_util.py

@@ -6,12 +6,14 @@
 importlib_util = util.import_importlib('importlib.util')
 
 import importlib.util
+from importlib import _bootstrap_external
 import os
 import pathlib
 import re
 import string
 import sys
 from test import support
+from test.support import os_helper
 import textwrap
 import types
 import unittest
@@ -775,5 +777,35 @@ def test_complete_multi_phase_init_module(self):
             self.run_with_own_gil(script)
 
 
+class MiscTests(unittest.TestCase):
+    def test_atomic_write_should_notice_incomplete_writes(self):
+        import _pyio
+
+        oldwrite = os.write
+        seen_write = False
+
+        truncate_at_length = 100
+
+        # Emulate an os.write that only writes partial data.
+        def write(fd, data):
+            nonlocal seen_write
+            seen_write = True
+            return oldwrite(fd, data[:truncate_at_length])
+
+        # Need to patch _io to be _pyio, so that io.FileIO is affected by the
+        # os.write patch.
+        with (support.swap_attr(_bootstrap_external, '_io', _pyio),
+              support.swap_attr(os, 'write', write)):
+            with self.assertRaises(OSError):
+                # Make sure we write something longer than the point where we
+                # truncate.
+                content = b'x' * (truncate_at_length * 2)
+                _bootstrap_external._write_atomic(os_helper.TESTFN, content)
+        assert seen_write
+
+        with self.assertRaises(OSError):
+            os.stat(support.os_helper.TESTFN) # Check that the file did not get written.
+
+
 if __name__ == '__main__':
     unittest.main()