Create a template within a ruby block

gistfile1.txt

ruby_block "create ssh key" do
  block do 
    k = SSHKey.generate(:type => 'RSA', :bits => 1024, :comment => "Postgres Master")
    node.set[:postgresql][:pubkey] = k.ssh_public_key
    node.save

    # Much of the DSL disappears in ruby blocks.  Here's how to create a template.
    rc = Chef::RunContext.new(node, node.cookbook_collection)
    t = Chef::Resource::Template.new "/var/lib/postgresql/.ssh/id_rsa"
    t.source("id_rsa.erb")
    t.owner("postgres")
    t.group("postgres")
    t.cookbook("postgresql")
    t.mode("0600")
    t.variables(
        :k => k.private_key
      )
    t.action(:create_if_missing)
    t.run_context=(rc)
    t.run_action("create")
  end
  not_if { File.exists?("/var/lib/postgresql/.ssh/id_rsa") }
end