if user specifies a string then we will set the value as string

e.g "10GB" but if user specifies an integer then we will set the
disk free limit to the value that user has set

there is no additional validation done here so if the user passes
a value that is beyond what system resources can accomodate it can
cause issues in production but we dont check the value against
the system resources

tests:

modified the disk_free_limit to both int and string and
confirmed that etc/rabbitmq/rabbitmq.config reflects the value
set.

    {log_levels, [{ connection, info }]},
    {disk_free_limit, 10000000},

or

    {log_levels, [{ connection, info }]},
    {disk_free_limit, "10GB"},

chef 12.7 output

  * template[/etc/rabbitmq/rabbitmq.config] action create
    - update content in file /etc/rabbitmq/rabbitmq.config from 08a317 to 75ef07
    - suppressed sensitive resource

attributes/default.rb

@@ -76,6 +76,7 @@
 
 # resource usage
 default['rabbitmq']['disk_free_limit_relative'] = nil
+default['rabbitmq']['disk_free_limit'] = nil
 default['rabbitmq']['vm_memory_high_watermark'] = nil
 default['rabbitmq']['max_file_descriptors'] = 1024
 default['rabbitmq']['open_file_limit'] = nil

templates/default/rabbitmq.config.erb

@@ -60,6 +60,13 @@
 <% if node['rabbitmq']['disk_free_limit_relative'] -%>
     {disk_free_limit, {mem_relative, <%= node['rabbitmq']['disk_free_limit_relative'] %>}},
 <% end %>
+<% if node['rabbitmq']['disk_free_limit'] %>
+    <% if node['rabbitmq']['disk_free_limit'].is_a? String %>
+    {disk_free_limit, "<%= node['rabbitmq']['disk_free_limit'] %>"},
+    <%elsif node['rabbitmq']['disk_free_limit'].is_a? Integer %>
+    {disk_free_limit, <%= node['rabbitmq']['disk_free_limit'] %>},
+    <% end %>
+<% end %>
 <% if node['rabbitmq']['vm_memory_high_watermark'] -%>
     {vm_memory_high_watermark, <%= node['rabbitmq']['vm_memory_high_watermark'] %>},
 <% end %>