daemon: Wait longer for EMANE network interfaces to exist.

When EMANE is still running.

daemon/core/emane/emane.py

@@ -1153,6 +1153,22 @@ class Emane(ConfigurableManager):
         self.session.sdt.updatenodegeo(node.objid, lat, long, alt)
         return True
 
+    def emanerunning(self, node):
+        '''\
+        Return True if an EMANE process associated with the given node
+        is running, False otherwise.
+        '''
+        status = -1
+        cmd = ['pkill', '-0', '-x', 'emane']
+        try:
+            if self.version < self.EMANE092:
+                status = subprocess.call(cmd)
+            else:
+                status = node.cmd(cmd, wait=True)
+        except:
+            pass
+        return status == 0
+
 def emane_version():
     'Return the locally installed EMANE version identifier and string.'
     cmd = ('emane', '--version')

daemon/core/netns/vif.py

@@ -116,7 +116,19 @@ class TunTap(PyCoreNetIf):
         def nodedevexists():
             cmd = (IP_BIN, 'link', 'show', self.name)
             return self.node.cmd(cmd)
-        self.waitfor(nodedevexists)
+        count = 0
+        while True:
+            try:
+                self.waitfor(nodedevexists)
+                break
+            except RuntimeError:
+                # check if this is an EMANE interface; if so, continue
+                # waiting if EMANE is still running
+                if count < 5 and isinstance(self.net, EmaneNode) and \
+                   self.node.session.emane.emanerunning(self.node):
+                    count += 1
+                else:
+                    raise
 
     def install(self):
         ''' Install this TAP into its namespace. This is not done from the