ruby file write doesn't work

file_write.rb

require 'tmpdir'
  require 'fileutils'

  _role="test"

  Dir.mktmpdir do |dir|
    git_dir="#{dir}"
    `git clone http://10.23.227.82/control/corpit-env_control.git #{dir}`

    File.open("#{dir}/Puppetfile.temp", "w") do |out_file|
      File.foreach("#{dir}/Puppetfile") do |line|
        out_file.puts line unless (line.include? "profile_#{_role}")
      end
    end

    FileUtils.mv("#{dir}/Puppetfile", "#{dir}/Puppetfile.temp")
    `ls #{dir}`
    `cat #{dir}/Puppetfile.temp`
    end