Merge pull request #1546 from AbelNavarro/multiple_or_cluster

crowbar: add validator for n nodes or cluster

Author: AbelNavarro

crowbar_framework/app/models/service_object.rb

@@ -854,6 +854,19 @@ def validate_at_least_n_for_role(proposal, role, n)
     end
   end
 
+  #
+  # Ensure that the proposal contains at least 2 nodes for role or a cluster
+  #
+  def validate_multiple_for_role_or_cluster(proposal, role)
+    elements = proposal["deployment"][@bc_name]["elements"]
+
+    if !elements.key?(role) ||
+        (elements[role].length < 2 &&
+         elements[role].none? { |e| is_cluster? e })
+      validation_error("Need at least 2 #{role} nodes or a cluster.")
+    end
+  end
+
   #
   # Ensure that the proposal contains an odd number of nodes for role
   #