fix the confusing exception and add a unit test

Author: akulakov

Lib/shutil.py

@@ -254,27 +254,35 @@ def copyfile(src, dst, *, follow_symlinks=True):
         os.symlink(os.readlink(src), dst)
     else:
         with open(src, 'rb') as fsrc, open(dst, 'wb') as fdst:
-            # macOS
-            if _HAS_FCOPYFILE:
-                try:
-                    _fastcopy_fcopyfile(fsrc, fdst, posix._COPYFILE_DATA)
-                    return dst
-                except _GiveupOnFastCopy:
-                    pass
-            # Linux
-            elif _USE_CP_SENDFILE:
-                try:
-                    _fastcopy_sendfile(fsrc, fdst)
+            try:
+                # macOS
+                if _HAS_FCOPYFILE:
+                    try:
+                        _fastcopy_fcopyfile(fsrc, fdst, posix._COPYFILE_DATA)
+                        return dst
+                    except _GiveupOnFastCopy:
+                        pass
+                # Linux
+                elif _USE_CP_SENDFILE:
+                    try:
+                        _fastcopy_sendfile(fsrc, fdst)
+                        return dst
+                    except _GiveupOnFastCopy:
+                        pass
+                # Windows, see:
+                # https://github.com/python/cpython/pull/7160#discussion_r195405230
+                elif _WINDOWS and file_size > 0:
+                    _copyfileobj_readinto(fsrc, fdst, min(file_size, COPY_BUFSIZE))
                     return dst
-                except _GiveupOnFastCopy:
-                    pass
-            # Windows, see:
-            # https://github.com/python/cpython/pull/7160#discussion_r195405230
-            elif _WINDOWS and file_size > 0:
-                _copyfileobj_readinto(fsrc, fdst, min(file_size, COPY_BUFSIZE))
-                return dst
-
-            copyfileobj(fsrc, fdst)
+
+                copyfileobj(fsrc, fdst)
+
+            # Issue 43219, raise a less confusing exception
+            except IsADirectoryError as e:
+                if os.path.exists(dst):
+                    raise
+                else:
+                    raise FileNotFoundError(f'Directory does not exist: {dst}') from e
 
     return dst
 

Lib/test/test_shutil.py

@@ -1249,6 +1249,15 @@ def test_copyfile_same_file(self):
         # Make sure file is not corrupted.
         self.assertEqual(read_file(src_file), 'foo')
 
+    @unittest.skipIf(MACOS or _winapi, 'On MACOS and Windows the errors are not confusing (though different)')
+    def test_copyfile_nonexistent_dir(self):
+        # Issue 43219
+        src_dir = self.mkdtemp()
+        src_file = os.path.join(src_dir, 'foo')
+        dst = os.path.join(src_dir, 'does_not_exist/')
+        write_file(src_file, 'foo')
+        self.assertRaises(FileNotFoundError, shutil.copyfile, src_file, dst)
+
 
 class TestArchives(BaseTest, unittest.TestCase):