From 43fb4467b7bd0a754b00ce128b25a16996b24647 Mon Sep 17 00:00:00 2001
From: Jarrod Johnson <jjohnson2@lenovo.com>
Date: Fri, 2 Nov 2018 15:56:34 -0400
Subject: [PATCH] Add error if chain goes off into non-existent nodes

Various behaviors break if the administrator declares a chain goes
to nowhere, throw up an error and hopefully see it caught to detect
this misconfiguration.
---
 confluent_server/confluent/discovery/core.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/confluent_server/confluent/discovery/core.py b/confluent_server/confluent/discovery/core.py
index d2e8b96c..cbf625cf 100644
--- a/confluent_server/confluent/discovery/core.py
+++ b/confluent_server/confluent/discovery/core.py
@@ -691,6 +691,10 @@ def get_enclosure_chain_head(nodename, cfg):
         if ne in members:
             raise exc.InvalidArgumentException(
                 'Circular chain that includes ' + nodename)
+        if not cfg.is_node(ne):
+            raise exc.InvalidArgumentException(
+                '{0} is chained to nonexistent node {1} '.format(
+                    nodename, ne))
         nodename = ne
         members.append(nodename)
     return nodename