Enhancement to RVC cluster.add_host to extract SSL Thumbprint of ESXi host w/o having to run commmand twice

gistfile1.rb

opts :add_host2 do
  summary "Add a host to a cluster"
  arg :cluster, nil, :lookup => VIM::ClusterComputeResource
  arg :hostnames, nil, :multi => true
  opt :username, "Username", :short => 'u', :default => 'root'
  opt :password, "Password", :short => 'p', :default => ''
  opt :force, "Force, e.g when host is already managed by other VC"
end

def add_host2 cluster, hostnames, opts
  sslThumbprint = nil
  hostnames.each do |hostname|
    while true
      `echo "" | openssl s_client -connect #{hostname}:443 2> /dev/null 1> /tmp/cert`
      sslThumbprint = `openssl x509 -in /tmp/cert -fingerprint -sha1 -noout | awk -F '=' '{print $2}'`.delete!("\n")
      spec = {
        :force => opts[:force],
        :hostName => hostname,
        :userName => opts[:username],
        :password => opts[:password],
        :sslThumbprint => sslThumbprint,
      }
      puts spec
      task = cluster.AddHost_Task :spec => spec,
                                  :asConnected => true
      begin
        one_progress task
        break
      end
    end
  end
end