opscode/chef — pull request #975 by gswallow (2013-09-04 21:58:16+00:00)
Title: CHEF-4522 (check for chef-client in /usr/local/bin)

Install Ruby 1.9 on Ubuntu 12.04. Check for chef-client in /usr/local/bin, too, and refrain from installing ruby/gems/etc when found

https://tickets.opscode.com/browse/CHEF-4522