From f983fdc9853b6b238f637c06f3e7f7d979d642a5 Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Fri, 23 Jan 2015 18:59:56 +0800
Subject: [PATCH] file_db: support default data if file not present

---
 artiq/protocols/file_db.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/artiq/protocols/file_db.py b/artiq/protocols/file_db.py
index edf6e7a33..71228985c 100644
--- a/artiq/protocols/file_db.py
+++ b/artiq/protocols/file_db.py
@@ -5,9 +5,16 @@ from artiq.protocols.sync_struct import Notifier
 
 
 class FlatFileDB:
-    def __init__(self, filename):
+    def __init__(self, filename, default_data=None):
         self.filename = filename
-        self.data = Notifier(pyon.load_file(self.filename))
+        try:
+            data = pyon.load_file(self.filename)
+        except FileNotFoundError:
+            if default_data is None:
+                raise
+            else:
+                data = default_data
+        self.data = Notifier(data)
         self.hooks = []
 
     def save(self):