Chef cookbook get path to zsh and create user

user-recipe.rb

NAME = "parshap"

# Create a resource to create the user (but do not execute)
create_user = user NAME do
  gid NAME
  supports :manage_home => true
  home HOME
  action :nothing
end

# Get path to zsh and execute the create_user resource
ruby_block "#{NAME} create user" do
  block do
    user_resource.shell `which zsh`.chop
    user_resource.run_action(:create)
  end
end