A custom condition for God that checks for change in a file (usually tmp/restart.txt)

restart_file_touched.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.exists?(self.restart_file) ? File.mtime(self.restart_file) : Time.at(0)
      end               

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

restart_file_touched.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.exists?(self.restart_file) ? File.mtime(self.restart_file) : Time.at(0)
      end               

      def valid?        
        valid = true            
        valid &= complain("Attribute 'restart_file' must be specified", self) if self.restart_file.nil?
        valid
      end

      def test
        process_start_time < restart_file_modification_time
      end                       
    end                 
  end
end