Only require config/application.rb when Rails.application not set

MSP-10964

Allows other Rails::Applications to use the commands.

Author: limhoff-r7

lib/metasploit/framework/command/base.rb

@@ -49,8 +49,11 @@ def self.require_environment!
     parsed_options.environment!
     ARGV.replace(parsed_options.positional)
 
-    # @see https://github.com/rails/rails/blob/v3.2.17/railties/lib/rails/commands.rb#L39-L40
-    require Pathname.new(__FILE__).parent.parent.parent.parent.parent.join('config', 'application')
+    # allow other Rails::Applications to use this command
+    if !defined?(Rails) || Rails.application.nil?
+      # @see https://github.com/rails/rails/blob/v3.2.17/railties/lib/rails/commands.rb#L39-L40
+      require Pathname.new(__FILE__).parent.parent.parent.parent.parent.join('config', 'application')
+    end
 
     # have to configure before requiring environment because
     # config/environment.rb calls initialize! and the initializers will use