Implement a lockfile in ruby

lockfile.rb

require 'fileutils'

begin
  path_to_lock_file = '/tmp/lock.lock'
  File.new(path_to_lock_file, File::CREAT|File::EXCL) # raise if file already exits
  begin
    system *ARGV
  ensure
    FileUtils.rm path_to_lock_file
  end
rescue Errno::EEXIST
  warn "Job currently running, exiting."
end