Up-to-date Chef cookbook for ruby
chef-infra, ruby, ruby-on-rails
Solution
I'm not sure whether you'll find one for updating the system version of Ruby, as chef is built on top of Ruby, and would therefore be updating itself whilst running, which I'm not sure is possible.
However, I've definitely seen Chef cookbooks for Ruby version managers such as RBenv and RVM, such as this one for rbenv, and this one for RVM. Is this for a Server or an OSX dev box? if it's for the later, then I've found Smeagol to be a pretty handy shortcut when configuring machines.
Problem
Is there an up-to-date cookbook for ruby? I wasn't able to find one on the opscode cookbook site. i.e ruby 1.9.3 or 1.9.2p280.