From 09c449104c15f7c4518eff77055d70af08bcc42a Mon Sep 17 00:00:00 2001
From: Mathieu Trudel-Lapierre <mathieu.trudel-lapierre@canonical.com>
Date: Wed, 21 Dec 2016 21:40:15 -0500
Subject: [PATCH] Don't crash if we can't start the nl80211 listener.

---
 probert/network.py | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/probert/network.py b/probert/network.py
index 06a176c..0f2b5c9 100644
--- a/probert/network.py
+++ b/probert/network.py
@@ -334,13 +334,19 @@ def start(self):
         self.rtlistener = _rtnetlink.listener(self)
         self.rtlistener.start()
 
-        self.wlan_listener = _nl80211.listener(self)
-        self.wlan_listener.start()
-
         self._fdmap =  {
             self.rtlistener.fileno(): self.rtlistener.data_ready,
-            self.wlan_listener.fileno(): self.wlan_listener.data_ready,
             }
+
+        try:
+            self.wlan_listener = _nl80211.listener(self)
+            self.wlan_listener.start()
+            self._fdmap.update({
+                self.wlan_listener.fileno(): self.wlan_listener.data_ready,
+                })
+        except RuntimeError:
+            log.debug('could not start wlan_listener')
+
         return list(self._fdmap)
 
     def data_ready(self, fd):