From c1dcf6dd102a582d3f286e08f4467a9aa13b93f8 Mon Sep 17 00:00:00 2001
From: Cole Dishington <Cole.Dishington@alliedtelesis.co.nz>
Date: Wed, 29 Nov 2023 13:36:11 +1300
Subject: [PATCH] apteryx-saver: Check for apteryx_query() failure whilst
 writing config

Check for apteryx_query() failure whilst writing config. Apteryx_query()
can return NULL if a refresher path included in the query doesn't
respond to apteryxd.
---
 saver.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/saver.c b/saver.c
index 905436b..a262492 100644
--- a/saver.c
+++ b/saver.c
@@ -279,7 +279,14 @@ write_config_process (gpointer arg1)
             apteryx_free_tree (config_nodes);
         config_nodes = apteryx_query (saver_nodes);
     }
-    _write_config ();
+    if (config_nodes)
+    {
+        _write_config ();
+    }
+    else
+    {
+        ERROR("Failed to fetch config to write");
+    }
     pthread_mutex_unlock (&config_lock);
     return G_SOURCE_CONTINUE;
 }