Made opendir throw a ResourceInvalidError if the path is not a dir

git-svn-id: http://pyfilesystem.googlecode.com/svn/trunk@787 67cdc799-7952-0410-af00-57a81ceafa0f

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/base.py b/fs/base.py
index cb10336..fdf06e5 100644
--- a/fs/base.py
+++ b/fs/base.py
@@ -893,6 +893,8 @@ class FS(object):
         from fs.wrapfs.subfs import SubFS
         if not self.exists(path):
             raise ResourceNotFoundError(path)
+        if not self.isdir(path):
+            raise ResourceInvalidError("path should reference a directory")
         return SubFS(self, path)
 
     def walk(self,