Fix backward incompatibility introduced in 2.4.16 (#535)

CHANGELOG.md

@@ -8,6 +8,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Unreleased
 
+- Fixes a backward incompatibility where `fs.move.move_file` raises `DestinationExists`
+  ([#535](https://github.com/PyFilesystem/pyfilesystem2/issues/535)).
+
 
 ## [2.4.16] - 2022-05-02
 

fs/move.py

@@ -82,7 +82,12 @@ def move_file(
                         rel_dst = frombase(common, dst_syspath)
                         with _src_fs.lock(), _dst_fs.lock():
                             with OSFS(common) as base:
-                                base.move(rel_src, rel_dst, preserve_time=preserve_time)
+                                base.move(
+                                    rel_src,
+                                    rel_dst,
+                                    overwrite=True,
+                                    preserve_time=preserve_time,
+                                )
                                 return  # optimization worked, exit early
                 except ValueError:
                     # This is raised if we cannot find a common base folder.

tests/test_move.py

@@ -151,6 +151,14 @@ def test_move_file_read_only_mem_dest(self):
                 dst_ro.exists("target.txt"), "file should not have been copied over"
             )
 
+    def test_overwrite(self):
+        with open_fs("temp://") as src, open_fs("temp://") as dst:
+            src.writetext("file.txt", "Content")
+            dst.writetext("target.txt", "Content")
+            fs.move.move_file(src, "file.txt", dst, "target.txt")
+            self.assertFalse(src.exists("file.txt"))
+            self.assertTrue(dst.exists("target.txt"))
+
     @parameterized.expand([(True,), (False,)])
     def test_move_file_cleanup_on_error(self, cleanup):
         with open_fs("mem://") as src, open_fs("mem://") as dst: