Select bootstrap node by list index not name

Modify the syntax used to access the ResourceGroup attributes so we
always select the first node from the group, e.g even if the node
named "0" in the ResourceGroup nested stack has been removed due to
the removal policy.

Change-Id: I8b1c9538976a1518b220187a0034ad41a738d5a6
Closes-Bug: #1640449

1 files changed, 13 insertions, 2 deletions

diff --git a/overcloud.j2.yaml b/overcloud.j2.yaml
index 47c73f8e..874418f2 100644
--- a/overcloud.j2.yaml
+++ b/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