From 3bbab24a5b1b7820cd23591f57e5047ee1cc9ea1 Mon Sep 17 00:00:00 2001
From: Aaron Griffith <aargri@gmail.com>
Date: Wed, 14 Mar 2012 00:30:41 -0400
Subject: [PATCH] fixed permission copying, fixes Issue #646

---
 overviewer_core/files.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/overviewer_core/files.py b/overviewer_core/files.py
index 225538b..dc680bb 100644
--- a/overviewer_core/files.py
+++ b/overviewer_core/files.py
@@ -108,8 +108,9 @@ if renameworks:
                             "some cleanup first, but I couldn't remove "
                             "'%s'!", self.tmpname)
             else:
-                # copy permission bits
-                shutil.copymode(self.tmpname, self.destname)
+                # copy permission bits, if needed
+                if os.path.exists(self.destname):
+                    shutil.copymode(self.destname, self.tmpname)
                 # atomic rename into place
                 os.rename(self.tmpname, self.destname)
 else: