Fixed issue with using copydir to copy to the root of a memoryfs

fs/base.py

@@ -668,6 +668,7 @@ class FS(object):
             copyfile = self.copy
 
         copyfile = self.copy
+        if dst:
             self.makedir(dst, allow_recreate=overwrite)
         for dirname, filenames in self.walk(src):
 

fs/memoryfs.py

@@ -227,7 +227,7 @@ class MemoryFS(FS):
     @synchronize
     def makedir(self, dirname, recursive=False, allow_recreate=False):
         if not dirname:            
-            raise PathError("", "Path is empty")
+            raise PathError(dirname)
         fullpath = dirname
         dirpath, dirname = pathsplit(dirname)
 

fs/mountfs.py

@@ -126,6 +126,8 @@ class MountFS(FS):
         fs, mount_path, delegate_path = self._delegate(path)
         if fs is self:
             raise UnsupportedError("make directory", msg="Can only makedir for mounted paths" )
+        if not delegate_path:
+            return True
         return fs.makedir(delegate_path, recursive=recursive, allow_recreate=allow_recreate)
 
     @synchronize

fs/path.py

@@ -202,3 +202,7 @@ def isprefix(path1,path2):
             return False
     return True
 
+def forcedir(path):
+    if not path.endswith('/'):
+        return path + '/'
+    return path

fs/utils.py

@@ -245,7 +245,15 @@ def find_duplicates(fs, compare_paths=None, quick=False, signature_chunk_size=16
 
 
 if __name__ == "__main__":
-    from fs.osfs import *
-    fs = OSFS('~/duptest')
-    for files in find_duplicates(fs, quick=False):
-        print files
+    from osfs import *
+    fs = OSFS('~/copytest')
+    
+    from memoryfs import *
+    m = MemoryFS()
+    m.makedir('maps')
+    
+    copydir((fs, 'maps'), (m, 'maps'))
+    
+    from browsewin import browse
+    browse(m)
+