Fixed an error were mountfs.makedir attempted to remake a mounted path

fs/mountfs.py

@@ -215,6 +215,11 @@ class MountFS(FS):
         fs, mount_path, delegate_path = self._delegate(path)
         if fs is self or fs is None:
             raise UnsupportedError("make directory", msg="Can only makedir for mounted paths" )
+        if not delegate_path:
+            if allow_recreate:
+                return
+            else:                
+                raise DestinationExistsError(path, msg="Can not create a directory that already exists (try allow_recreate=True): %(path)s")
         return fs.makedir(delegate_path, recursive=recursive, allow_recreate=allow_recreate)
 
     @synchronize

fs/utils.py

@@ -432,6 +432,11 @@ if __name__ == "__main__":
     #browse(m)
 
     from osfs import *
-    f = OSFS('/home/will/projects')
-    print_fs(f)
+    #f = OSFS('/home/will/projects')
+    f=OSFS('/home/will/tests')
+    from fs.memoryfs import MemoryFS
+    mem = MemoryFS()
+    from fs.utils import copydir
+    copydir(f, mem)
+    print_fs(mem)