format and mount an EBS volume in Chef

ebs.rb

    ruby_block "wait for #{device_id}" do
      block do
        count = 1
        loop do
          if File.blockdev?(device_id) or count >= 10
            break
          else
            Chef::Log.info("device #{device_id} not ready - sleeping 10s")
            sleep 10
            count += 1
          end
        end
      end
    end
    # create file system
    execute "mkfs #{device_id}" do
      command "mkfs -t ext4 -m 0.25 #{device_id}"
      # only if it's not mounted already
      not_if "grep -qs #{mount_point} /proc/mounts"
    end
    # mount
    directory mount_point do
        mode "0775"
        owner "cogtree"
        group "cogtree"
        recursive true
        action :create
    end
    mount mount_point do
      device device_id
      fstype 'ext4'
      options 'rw,noatime,nobootwait'
      action [:enable, :mount]
    end