storage: add client methods to work with config

service/lib/agama/dbus/clients/storage.rb

@@ -24,6 +24,7 @@
 require "agama/dbus/clients/with_locale"
 require "agama/dbus/clients/with_progress"
 require "agama/dbus/clients/with_issues"
+require "json"
 
 module Agama
   module DBus
@@ -62,6 +63,22 @@ def finish
           dbus_object.Finish
         end
 
+        # Gets the current storage config.
+        #
+        # @return [Hash]
+        def config
+          serialized_config = dbus_object.GetConfig
+          JSON.parse(serialized_config, symbolize_names: true)
+        end
+
+        # Sets the storage config.
+        #
+        # @param config [Hash]
+        def config=(config)
+          serialized_config = JSON.pretty_generate(config)
+          dbus_object.SetConfig(serialized_config)
+        end
+
       private
 
         # @return [::DBus::Object]