From 510e0e6ee586629a7fae2c9375e648dcd0dcfa4a Mon Sep 17 00:00:00 2001
From: Jan Krcmar <honza801@gmail.com>
Date: Thu, 11 Feb 2016 14:48:41 +0100
Subject: [PATCH] guess_mac checks for existing dhcp_file

---
 instances/views.py | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/instances/views.py b/instances/views.py
index 361c1c2..f69f356 100644
--- a/instances/views.py
+++ b/instances/views.py
@@ -1,3 +1,4 @@
+import os
 import time
 import json
 import socket
@@ -676,14 +677,15 @@ def inst_graph(request, compute_id, vname):
 def guess_mac_address(request, vname):
     dhcp_file = '/srv/webvirtcloud/dhcpd.conf'
     data = { 'vname': vname, 'mac': '52:54:00:' }
-    with open(dhcp_file, 'r') as f:
-        name_found = False
-        for line in f:
-            if "host %s." % vname in line:
-                name_found = True
-            if name_found and "hardware ethernet" in line:
-                data['mac'] = line.split(' ')[-1].strip().strip(';')
-                break
+    if os.path.isfile(dhcp_file):
+        with open(dhcp_file, 'r') as f:
+            name_found = False
+            for line in f:
+                if "host %s." % vname in line:
+                    name_found = True
+                if name_found and "hardware ethernet" in line:
+                    data['mac'] = line.split(' ')[-1].strip().strip(';')
+                    break
     return HttpResponse(json.dumps(data));
 
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