feature: helper method to check if a default command exists

Signed-off-by: Dominik Richter <dominik@vulcanosec.com>

lib/resources/command.rb

@@ -0,0 +1,11 @@
+# Copyright (c) 2015 Vulcano Security GmbH. All rights reserved.
+module Serverspec::Type
+  class Command < Base
+    # Check if a given command (executable) exists
+    # in the default path
+    def exists?
+      cmd = @name
+      Command.new("type \"#{cmd}\" > /dev/null").exit_status == 0
+    end
+  end
+end

lib/vulcano.rb

@@ -13,6 +13,7 @@ require 'vulcano/rule'
 require 'vulcano/rspec_json_formatter'
 
 require 'resources/audit_policy'
+require 'resources/command'
 require 'resources/file'
 require 'resources/group_policy'
 require 'resources/mysql_conf'