Merge "Select bootstrap node by list index not name"

overcloud.j2.yaml

@@ -231,8 +231,19 @@ resources:
       config: {get_attr: [allNodesConfig, config_id]}
       servers: {get_attr: [{{role.name}}, attributes, nova_server_resource]}
       input_values:
-        bootstrap_nodeid: {get_attr: [{{role.name}}, resource.0.hostname]}
-        bootstrap_nodeid_ip: {get_attr: [{{role.name}}, resource.0.ip_address]}
+        # Note we have to use yaql to look up the first hostname/ip in the
+        # list because heat path based attributes operate on the attribute
+        # inside the ResourceGroup, not the exposed list ref discussion in
+        # https://bugs.launchpad.net/heat/+bug/1640488
+        # The coalesce is needed because $.data is None during heat validation
+        bootstrap_nodeid:
+          yaql:
+            expression: coalesce($.data, []).first(null)
+            data: {get_attr: [{{role.name}}, hostname]}
+        bootstrap_nodeid_ip:
+          yaql:
+            expression: coalesce($.data, []).first(null)
+            data: {get_attr: [{{role.name}}, ip_address]}
 
   {{role.name}}AllNodesValidationDeployment:
     type: OS::Heat::StructuredDeployments