fix incorrect error handling in deltatar

Account for the fact that the os library converts return values
to exceptions ... It is not documented whether os.open() can ever
return negative values at all.

diff --git a/deltatar/deltatar.py b/deltatar/deltatar.py
index 03de734..460d274 100644 (file)
--- a/deltatar/deltatar.py
+++ b/deltatar/deltatar.py
@@ -445,8 +445,12 @@ class DeltaTar(object):
         while queue:
             cur_path = queue.pop(0)
 
-            dfd = os.open (cur_path, os.O_DIRECTORY)
-            if dfd == -1: # it might have been removed in the meantime
+            try:
+                dfd = os.open (cur_path, os.O_DIRECTORY)
+            except FileNotFoundError as exn:
+                self.logger.warning ("failed to open entity [%s] as directory; "
+                                     "file system (error: %s); skipping"
+                                     % (cur_path, str (exn)))
                 continue
 
             try: