Restore the temp_store_handler.

storage/basestorage.py

@@ -1,3 +1,6 @@
+import tempfile
+
+
 class Storage(object):
 
   """Storage is organized as follow:
@@ -13,6 +16,18 @@ class Storage(object):
   # Set the IO buffer to 64kB
   buffer_size = 64 * 1024
 
+  @staticmethod
+  def temp_store_handler():
+    tmpf = tempfile.TemporaryFile()
+  
+    def fn(buf):
+      try:
+        tmpf.write(buf)
+      except IOError:
+        pass
+  
+    return tmpf, fn
+
   #FIXME(samalba): Move all path resolver in each module (out of the base)
   def images_list_path(self, namespace, repository):
     return '{0}/{1}/{2}/_images_list'.format(self.repositories,