# File lib/fog/compute/openstack/models/key_pair.rb, line 37
        def write(path = "#{ENV['HOME']}/.ssh/fog_#{Fog.credential}_#{name}.pem")
          if writable?
            split_private_key = private_key.split(/\n/)
            File.open(path, "w") do |f|
              split_private_key.each { |line| f.puts line }
              f.chmod 0600
            end
            "Key file built: #{path}"
          else
            "Invalid private key"
          end
        end