install_file

# File lib/rubygems/commands/setup_command.rb, line 311
  def install_file(file, dest_dir)
    dest_file = File.join dest_dir, file
    dest_dir = File.dirname dest_file
    unless File.directory? dest_dir
      mkdir_p dest_dir, :mode => 0755
    end

    install file, dest_file, :mode => options[:data_mode] || 0644
  end