Bug 999071 - Empty ANR file during testing instead of deleting it; r=gbrown

build/mobile/remoteautomation.py

@@ -98,10 +98,12 @@ class RemoteAutomation(Automation):
         return status
 
     def deleteANRs(self):
-        # delete ANR traces.txt file; usually need root permissions
+        # empty ANR traces.txt file; usually need root permissions
+        # we make it empty and writable so we can test the ANR reporter later
         traces = "/data/anr/traces.txt"
         try:
-            self._devicemanager.shellCheckOutput(['rm', traces], root=True)
+            self._devicemanager.shellCheckOutput(['echo', '', '>', traces], root=True)
+            self._devicemanager.shellCheckOutput(['chmod', '666', traces], root=True)
         except DMError:
             print "Error deleting %s" % traces
             pass