puppet kernel update ensure latest an reboot

kernelupdate.pp

#snipplet

                
                package { "at" : ensure => installed }
                
                case $virtual {
                    "xenu":
                    {
                        package { "kernel" : 
                            name => "kernel-xen",
                            ensure => latest } 
                    }          
                    "hyperv":
                    {
                        package { "kernel" : 
                            name => "kernel",
                            ensure => latest }
                    }
                
                }
                
#initiate a reboot in one hour!
# check with: atq or atrm!

                exec { "rebootme":
                  path      => ['/usr/bin', '/usr/sbin', '/bin'],
                  command   => '/bin/bash -c \'echo "/sbin/init 6" | /usr/bin/at now + 1 hour\'',
                  #command   => '/bin/bash -c \'echo "/sbin/init 6" | /usr/bin/at 04:00\'',
                  subscribe => [ package["kernel"] ],
                  refreshonly => true,
                }