backgrond job processing suing ruby process library uses ahsandar/fury to run shell commands

fork_detach.rb

module ForkDetach

  def chk_download_complete(job_list)
    loop do
      process_output = []
      job_list.each do | job|
        process_output << format_process_output(Fury.run_now("ps ho pid,state -p #{job}"))
      end
      break if wait_process_completion(process_output)
    end
    true
  end

  def wait_process_completion(process_output)
    sleep_time = 30
    puts "#{Time.now}: going to sleep for #{sleep_time}"
    sleep sleep_time
    puts "#{Time.now}: awake going to check again"
    process_output.reject { |e| e.to_s.empty? }.empty?
  end

  def format_process_output(output)
    return output if output.nil?
    ps_output = output.gsub("PID STAT\n",'')
    return (ps_output.nil? ? output.chop.strip : ps_output.chop.strip)
  end

  def fork_detach(folder, file)
    job = fork do
      Fury.run_now("s3cmd --config=<s3_config file> get --force <s3 bucket> <local dir>")
    end
    Process.detach(job)
    job
  end

end