--- a/pvl/rrd/api.py	Sun Jan 20 15:42:32 2013 +0200
+++ b/pvl/rrd/api.py	Sun Jan 20 18:17:29 2013 +0200
@@ -1,6 +1,7 @@
 import rrdtool
 
 import pvl.invoke
+import tempfile
 
 import logging; log = logging.getLogger('pvl.rrd.api')
 
@@ -58,12 +59,14 @@
             graph_file              - file-like object containing graph image, unless out=False -> stdout
 
         With out=None, the returned graph_file is a tempfile which will be cleaned up by Python once close()'d!
+
+        XXX: tempfile suffix as .png?
     """
 
     if out is None :
         # tempfile
         out_file = tempfile.NamedTemporaryFile(suffix='.png', delete=True) # python2.6
-        out_path = out.name
+        out_path = out_file.name
 
     elif out is False :
         out_file = None
@@ -74,6 +77,8 @@
         out_path = out
         out_file = True # open later
     
+    log.debug("%s", out_path)
+
     # XXX: handle tempfile close?
     width, height, out_lines = cmd(rrdtool.graph, (out_path, ), opts, args)