expose backend file path

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

lib/vulcano/plugins/backend_file_common.rb

@@ -6,7 +6,7 @@ class Vulcano::Plugins::Backend
     # backend File
     %w{
       exists? mode owner group link_target content mtime size
-      selinux_label product_version file_version
+      selinux_label product_version file_version path
     }.each do |m|
       define_method m.to_sym do
         fail NotImplementedError, "File must implement the #{m}() method."

lib/vulcano/plugins/backend_linux_file.rb

@@ -4,6 +4,7 @@ require 'shellwords'
 
 class Vulcano::Plugins::Backend
   class LinuxFile < FileCommon
+    attr_reader :path
     def initialize(backend, path)
       @backend = backend
       @path = path