grab kernel version

attribute.rb

default[:kernel][:newinstall] = "default"

kernel.rb

package "kernel-xen"

log("Detected kernel installed: #{node[:kernel][:newinstall]}") { level :debug }
ruby_block "find_installed_kernel_ver" do
  block do
    node.set[:kernel][:newinstall] = %x[cd /boot && ls -t vmlinuz*].split('vmlinuz-')[1].strip
    Chef::Log.debug("#{node[:kernel][:newinstall]}")
  end
end
log("Detected kernel installed: #{node[:kernel][:newinstall]}") { level :debug }

template "/boot/grub/grub.conf" do
  source "grub.conf.erb"
end

template.rb

default=0
timeout=5

title=<%= node[:platform] %> (<%= node[:kernel][:newinstall] %>)
	root (hd0)
	kernel /boot/vmlinuz-<%= node[:kernel][:newinstall] %> ro console=hvc0 root=/dev/xvda1
	initrd /boot/initrd-<%= node[:kernel][:newinstall] %>.img