display date of the last configuration change from last version

docs/configuration.md

@@ -23,6 +23,10 @@ You can set the following parameter:
 - `url_prefix`: Defines a URL prefix (default: no prefix)
 - `vhosts`: A list of virtual hosts to listen to. If not specified, it will
   respond to any virtual host.
+- `mtime_from_versions`: `true`/`false`: Enables or disables display
+  last configuration change date on nodes list from last version.
+  Can increase node list display time depend on used `output` realization
+  (default: `false`)
 
 ## Examples
 
@@ -87,4 +91,4 @@ extensions:
     hide_node_vars:
      - enable
      - password
-```
+```

lib/oxidized/web.rb

@@ -63,7 +63,8 @@ def self.parse_new_configuration(configuration)
           uri_prefix: normalize_uri(configuration.url_prefix? ||
                                     DEFAULT_URI_PREFIX),
           vhosts: configuration.vhosts? || [],
-          hide_node_vars: hide_node_vars
+          hide_node_vars: hide_node_vars,
+          mtime_from_versions: configuration.mtime_from_versions? || false
         }
       end
 

lib/oxidized/web/webapp.rb

@@ -47,6 +47,9 @@ class WebApp < Sinatra::Base
             node[:status] = node[:last][:status]
             node[:time]   = node[:last][:end]
           end
+          if settings.configuration[:mtime_from_versions] == true
+            set_mtime_from_versions(node)
+          end
           node
         end
         out :nodes
@@ -61,6 +64,9 @@ class WebApp < Sinatra::Base
             node[:status] = node[:last][:status]
             node[:time]   = node[:last][:end]
           end
+          if settings.configuration[:mtime_from_versions] == true
+            set_mtime_from_versions(node)
+          end
           node
         end
         out :nodes
@@ -351,6 +357,20 @@ def filter_node_vars(serialized_node)
 
         data
       end
+
+      # set node last changed time to last version time
+      # potential can be long operation
+      def set_mtime_from_versions(node)
+        if node[:mtime] == 'unknown' || node[:mtime].nil?
+          group = node[:group] == 'default' ? nil : node[:group]
+          versions = nodes.version(node[:name], group)
+          if versions.is_a?(Array) && !versions.empty? && versions.first[:time]
+            node[:mtime] = versions.first[:time]
+          end
+        end
+        node
+      end
+
     end
   end
 end