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README.md

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+# knife-env-diff
+
+A plugin for Chef::Knife which will diff the cookbook versions of two or more environments.
+
+## Usage 
+
+Supply two or more environments to get a diff of their cookbook versions
+
+```
+% knife env-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
+```
+
+## Installation
+
+#### Script install
+
+Copy the knife-env-diff script from lib/chef/knife/env-diff.rb to your ~/.chef/plugins/knife directory.
+
+#### Gem install
+
+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

knife-env-diff.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "knife-env-diff/version"
+
+Gem::Specification.new do |s|
+  s.name          = 'knife-env-diff'
+  s.version       = Knife::EnvDiff::VERSION
+  s.date          = '2012-01-02'
+  s.summary       = "A plugin for Chef::Knife which displays the roles that are included recursively within a role and optionally displays all the roles that include it."
+  s.description   = s.summary
+  s.authors       = ["John Goulah"]
+  s.email         = ["jgoulah@gmail.com"]
+  s.homepage      = "https://github.com/jgoulah/knife-env-diff"
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+end

lib/chef/knife/env-diff.rb

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+#
+# Author:: John Goulah (<jgoulah@gmail.com>)
+# Copyright:: Copyright (c) 2011 John Goulah
+#
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##     http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+#
+
+module GoulahKnifePlugins
+  class EnvDiff < Chef::Knife
+
+    banner "knife env-diff [ENVIRONMENTS...]"
+
+    def run
+      if name_args.size < 2
+        ui.error("You need to supply at least two environments")
+        show_usage
+        exit 1
+      end
+
+      firstenv  = name_args.first
+      otherenvs = name_args.slice(1, name_args.length - 1)
+
+      from_env   = {}
+      env = load_environment(firstenv)
+      from_env[firstenv] = env.cookbook_versions
+
+      to_env   = {}
+      otherenvs.each do |env_name|
+        env = load_environment(env_name)
+        to_env[env_name] = env.cookbook_versions
+      end
+
+      ui.msg "diffing environment " + firstenv + " against " + otherenvs.join(', ') + "\n\n"
+
+      from_env.each_value do |from_cookbooks|
+        from_cookbooks.each do |from_cookbook, from_version|
+
+          diff_versions = {}
+
+          to_env.each do |to_env, to_cookbooks|
+            to_version = to_cookbooks[from_cookbook] || "missing"
+            if from_version != to_version
+              diff_versions[to_env] = to_version
+            end
+          end
+
+          unless diff_versions.empty?
+            ui.msg "cookbook: "+ from_cookbook
+            ui.msg " #{firstenv} version: "+ from_version
+            diff_versions.each do |env, version|
+              ui.msg " #{env} version: "+ version
+            end
+            ui.msg "\n"
+          end
+
+        end
+      end
+
+    end
+
+    def load_environment(env)
+      e = Chef::Environment.load(env)
+      return e
+      rescue Net::HTTPServerException => e
+        if e.response.code.to_s == "404"
+          ui.error "The environment #{env} does not exist on the server, aborting."
+          Chef::Log.debug(e)
+          exit 1
+        else
+          raise
+        end
+   end
+
+  end
+end

lib/knife-env-diff/version.rb

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+module Knife
+  module EnvDiff
+    VERSION = "0.0.1"
+  end
+end