small updates

lib/vos/box/marks.rb

@@ -1,30 +1,27 @@
 module Vos
   class Box
     module Marks
-      def mark key
-        ensure_mark_requrements!
-        file("#{marks_dir}/#{key}").create!
+      def mark key              
+        marks_dir.file(key).create
+        marks_cache.clear
       end
 
       def has_mark? key
-        ensure_mark_requrements!
-        entry["#{marks_dir}/#{key}"].exist?
+        marks_cache.include? key.to_s
       end
 
       def clear_marks
-        bash "rm -r #{marks_dir}"
+        marks_dir.destroy
+        marks_cache.clear
       end
-
+
+      def marks_dir
+        dir "/etc/vos/marks"
+      end
+
       protected
-        def marks_dir
-          home "/.marks"
-        end
-
-        def ensure_mark_requrements!
-          unless @ensure_mark_requrements
-            self.dir(marks_dir).create
-            @ensure_mark_requrements = true
-          end
+        def marks_cache
+          @marks_cache ||= marks_dir.files.collect{|file| file.name}
         end
     end
   end

lib/vos/drivers/ssh.rb

@@ -128,7 +128,6 @@ def hacked_exec!(ssh, command, merge_stdout_and_stderr = false, &block)
           end  
 
           channel.wait      
-
           [stdout_data, stderr_data, exit_code, exit_signal]
         end    
     end

lib/vos/helpers/ubuntu.rb

@@ -5,7 +5,7 @@ def default_env
         {:DEBIAN_FRONTEND => 'noninteractive'}
       end
       def wrap_cmd env_str, cmd
-        %(. #{env_file.path} && #{env_str}#{' && ' unless env_str.empty?}#{cmd})
+        %(source #{env_file.path} && #{env_str}#{' && ' unless env_str.empty?}#{cmd})
       end
 
       def env_file
@@ -36,12 +36,18 @@ def reload_env
 module Vfs
   class File
     def append_to_environment_of box, reload = true
-      raise "#{box} must be an Vos::Box" unless file.is_a? Vos::Box        
+      raise "#{box} must be an Vos::Box" unless box.is_a? Vos::Box        
 
-      copy_to! box.dir('/etc/profile_ext').file(name)
+      remote_file = box.dir('/etc/profile_ext').file(name)
+      copy_to! remote_file
 
-      require_clause = "source #{remote_file.path}"
-      box.env_file.append "\n#{require_clause}\n" unless env_file.content.include? require_clause
+      require_clause = <<-BASH
+
+# #{name}
+source #{remote_file.path}
+      BASH
+
+      box.env_file.append require_clause unless box.env_file.content.include? require_clause
 
       box.reload_env if reload
     end