A plugin for Chef::Knife which will diff the cookbook versions of two or more environments.
Supply two or more environments to get a diff of their cookbook versions
% knife environment diff development production diffing environment development against production cookbook: hadoop development version: = 0.1.0 production version: = 0.1.8 cookbook: mysql development version: = 0.2.4 production version: = 0.2.5
Copy the knife-env-diff script from lib/chef/knife/env-diff.rb to your ~/.chef/plugins/knife directory.
knife-env-diff is available on rubygems.org - if you have that source in your gemrc, you can simply use:
gem install knife-env-diff