From f5deafb267918bd3a586dc0a33fd9a050d6e4a03 Mon Sep 17 00:00:00 2001
From: Robert Jordens <rj@m-labs.hk>
Date: Thu, 16 Jun 2016 11:50:09 +0200
Subject: [PATCH] browser: add a debug message for OSError on HDF5 open

---
 artiq/browser/files.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/artiq/browser/files.py b/artiq/browser/files.py
index 77caf6202..6a6407e1f 100644
--- a/artiq/browser/files.py
+++ b/artiq/browser/files.py
@@ -17,7 +17,8 @@ def open_h5(info):
     try:
         return h5py.File(info.filePath(), "r")
     except OSError:  # e.g. file being written (see #470)
-        return
+        logger.debug("OSError when opening HDF5 file %s", info.filePath(),
+                     exc_info=True)
     except:
         logger.warning("unable to read HDF5 file %s", info.filePath(),
                        exc_info=True)