Add AllNodesExtraMapData parameter

The AllNodesExtraMapData parameter is used to inject additional
hieradata into the all_nodes hierdata file on each node. The injected
data will be deeploy merged with the calculated all_nodes data for the
stack.

The parameter can be taken advantage of for split-controlplane use cases
where the hieradata from the control stack needs to be populated into
the separate compute stacks.

To easily get the hieradata out of the control stack, a new stack output
is added, AllNodesConfig.

Partially Implements: blueprint split-controlplane

Change-Id: I7b865bf82520006eef3ac2f36df34b1f3c34e642

overcloud.j2.yaml

@@ -1043,3 +1043,6 @@ outputs:
   BlacklistedHostnames:
     description: List of blacklisted hostnames
     value: {get_attr: [BlacklistedHostnames, value]}
+  AllNodesConfig:
+    description: The config (hieradata) for all nodes.
+    value: {get_attr: [allNodesConfig, all_nodes_config]}

puppet/all-nodes-config.j2.yaml

@@ -61,6 +61,10 @@ parameters:
   EnableInternalTLS:
     type: boolean
     default: false
+  AllNodesExtraMapData:
+    type: json
+    default: {}
+    description: Map of extra data (hieradata) to set on each node.
 
 {%- for network in networks %}
   {{network.name}}NetName:
@@ -71,15 +75,14 @@ parameters:
 
 resources:
 
-  allNodesConfigImpl:
-    type: OS::Heat::StructuredConfig
+  allNodesConfigValue:
+    type: OS::Heat::Value
     properties:
-      group: hiera
-      config:
-        datafiles:
-          bootstrap_node:
-            bootstrap_nodeid: {get_input: bootstrap_nodeid}
-            bootstrap_nodeid_ip: {get_input: bootstrap_nodeid_ip}
+      value:
+        yaql:
+          expression: $.data.all_nodes_extra_map_data.mergeWith($.data.all_nodes)
+          data:
+            all_nodes_extra_map_data: {get_param: AllNodesExtraMapData}
             all_nodes:
               map_merge:
                 - enabled_services:
@@ -144,6 +147,17 @@ resources:
                   update_identifier: {get_param: UpdateIdentifier}
                   stack_action: {get_param: StackAction}
                   stack_update_type: {get_param: StackUpdateType}
+
+  allNodesConfigImpl:
+    type: OS::Heat::StructuredConfig
+    properties:
+      group: hiera
+      config:
+        datafiles:
+          bootstrap_node:
+            bootstrap_nodeid: {get_input: bootstrap_nodeid}
+            bootstrap_nodeid_ip: {get_input: bootstrap_nodeid_ip}
+          all_nodes: {get_attr: [allNodesConfigValue, value]}
           vip_data:
             map_merge:
               # Dynamically generate per-service VIP data based on enabled_services
@@ -211,3 +225,6 @@ outputs:
     description: The ID of the allNodesConfigImpl resource.
     value:
       {get_resource: allNodesConfigImpl}
+  all_nodes_config:
+    description: The all_nodes hieradata config
+    value: {get_attr: [allNodesConfigValue, value]}

releasenotes/notes/all-nodes-extra-map-data-b8c8829dfa7f1c26.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - AllNodesExtraMapData is a new parameter that can be used to inject
+    additional hieradata into the all_nodes.yaml hieradata file on each node.
+    The injected data will be deeply merged with the new all_nodes hieradata
+    calculated for the stack.