simple example of adding a user and ssh key in chef

gistfile1.rb

username = "foo"
homedir  = "/home/#{username}"

user username do
  action :create
  comment "foo user"
  home homedir
  supports :manage_home => true
end

directory "#{homedir}/.ssh" do
  owner username
  group username
end

 template "#{homedir}/.ssh/id_rsa" do
   source "id_rsa.erb"
   owner username
   group username
   mode 0600
   not_if { File.exists?("#{homedir}/.ssh/id_rsa") }
 end