check_bootstrap.rb

require 'chef/knife'

class Chef
  class Knife
    class CheckBootstrap < Knife

      deps do
        require 'chef/knife/bootstrap'
        require 'chef/knife/core/bootstrap_context'
        require 'erubis'
      end

      option :use_sudo,
      :long => "--sudo",
      :description => "Execute the bootstrap via sudo",
      :boolean => true

      option :run_list,
      :short => "-r RUN_LIST",
      :long => "--run-list RUN_LIST",
      :description => "Comma separated list of roles/recipes to apply",
      :proc => lambda { |o| o.split(/[\s,]+/) },
      :default => []

      banner "knife check bootstrap TEMPLATE_NAME"

      def run
        b = Chef::Knife::Bootstrap.new
        b.config = config
        b.config[:distro] = @name_args[0]
        puts b.ssh_command
      end

    end
  end
end