RestartFileTouched.rb

module God
  module Conditions
    class RestartFileTouched < PollCondition
      attr_accessor :restart_file
      def initialize    
        super                   
      end               

      def process_start_time
        Time.parse(`ps -o lstart  -p #{self.watch.pid} --no-heading`)
      end               

      def restart_file_modification_time
        File.mtime(self.restart_file)
      end               

      def valid?        
        valid = true            
        valid &= complain("Attribute 'restart_file' must be specified", self) if self.restart_file.nil?
        valid
      end                       
                        
      def test
        if process_start_time < restart_file_modification_time
          return true
        else                            
          return false          
        end                             
      end                       
    end                 
  end
end

there is a small unhandled exception in case the restart file doesn't exists, here's what I did:

  def file_modification_time
    (File.exists?(self.file))? File.mtime(self.file) : Time.at(0)
  end

Where do you put the RestartFIleTouched.rb and where do you load it ?

you can put it in your lib path, or where you whant just load it with a simple require '/my_path_to/RestartFileTouched'

The '--no-heading' option doesn't work on Mac OS X.

I had success with "ps -o lstart= -p #{pid}". Note the trailing equals sign (=). This sets a custom header to blank, which causes both Linux and Mac OS X ps to omit the header line.