makes a host a template, migrates to better datastore

#!/usr/bin/env ruby
require 'rubygems'
require 'rbvmomi'
require 'yaml'

VIM = RbVmomi::VIM

abort "Usage: make_template.rb vspherehost datacenter host-config-yaml username password" unless ! ARGV.empty?

vmhost = YAML.load_file(ARGV[2])
ARGV[2] = vmhost['hostname']

@vim = VIM.connect(:host => ARGV[0], :user => ARGV[3], :password => ARGV[4], :insecure => true)
@sc = @vim.serviceContent
@dc = @vim.serviceInstance.find_datacenter(ARGV[1]) or abort "datacenter not found"
vm = @dc.vmFolder.traverse(ARGV[2], VIM::VirtualMachine)
unless vm
  puts "Virtual machine #{ARGV[2]} was not found!"
  exit 1
end

puts "Shutting down #{ARGV[2]}"
begin
  vm.PowerOffVM_Task.wait_for_progress
rescue RbVmomi::Fault
 puts "#{ARGV[2]} is already powered off"
end
sleep 5

bestds = nil
@dc.datastore.each do |ds|
#  if (bestds.nil? || bestds.summary[:freeSpace] < ds.summary[:freeSpace])
#    bestds = ds
#  end
  if ds.name == "devcloud-template-ds"
    bestds = ds
  end
end

puts "Enabling Memory Hot Add"
spec = RbVmomi::VIM::VirtualMachineConfigSpec(:memoryHotAddEnabled => true)
task = vm.ReconfigVM_Task(:spec => spec)
task.wait_for_completion

puts "Confirming MAC is set to Assigned"
nic = vm.config.hardware.device.grep(RbVmomi::VIM::VirtualEthernetCard).find{|n| n.props}
nic[:addressType] = "Assigned"
spec = RbVmomi::VIM.VirtualMachineConfigSpec({ :deviceChange => [{ :operation => :edit, :device => nic }] })
vm.ReconfigVM_Task(:spec => spec).wait_for_completion

puts "Thin provisioning and moving #{ARGV[2]} to datastore with largest space (#{bestds.name})"
task = vm.RelocateVM_Task(spec: VIM.VirtualMachineRelocateSpec(:datastore => bestds, :transform => "sparse"))
task.wait_for_completion

puts "Marking #{ARGV[2]} as template"
begin
  vm.MarkAsTemplate
rescue
  puts "#{ARGV[2]} is already a template"
end