A Knife plugin to list environment cookbooks and version constrains.

environment_constraints.rb

#
# Author:: Sander Botman (<sbotman@schubergphilis.com>)
# Copyright:: Copyright (c) 2013 Sander Botman.
# License:: Apache License, Version 2.0
#
# 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.
#

require 'chef/knife'

class Chef
  class Knife
    class EnvironmentConstraints < Knife

      deps do
        require 'chef/environment'
        require 'chef/json_compat'
      end

      banner "knife environment constraints [ ENVIRONMENT ENVIRONMENT ]"

      option :mismatch,
        :short => "-m",
        :long => "--mismatch",
        :description => "Only show cookbooks where versions mismatch",
        :boolean => true

      def run

        environments = []
        unless @name_args.nil? || @name_args.empty?
          @name_args.each { |name| environments << name }
        else
          environments = Chef::Environment.list
        end

        cookbook_hash = {}
        cookbook_col = {}

        object_list = [ ui.color('', :bold) ]

        environments.each do |env,url|
          unless "#{env}" == "_default"
            envdata = Chef::Environment.load(env)
            cookbook_ver = envdata::cookbook_versions
            cookbook_col.merge!(cookbook_ver)
            cookbook_hash["#{env}"] = cookbook_ver
            object_list << ui.color("#{env}", :bold)
          end
        end

        if cookbook_col.nil? || cookbook_col.empty?
          ui.error "Cannot find any environment cookbook constraints"
          exit 1
        end

        columns = object_list.count

        cookbook_col.sort.each do |book,version|

          result = []

          environments.each do |env,url|
            unless cookbook_hash["#{env}"].nil?
              if cookbook_hash["#{env}"].include?("#{book}")
                result << cookbook_hash["#{env}"]["#{book}"]
              end
            end
          end

          unless config[:mismatch] and result.uniq.count == 1

            object_list << ui.color("#{book}", :bold)

            environments.each do |env,url|
              unless cookbook_hash["#{env}"].nil?
                if cookbook_hash["#{env}"].include?("#{book}")
                  tag = cookbook_hash["#{env}"]["#{book}"]

                  version = ui.color(tag)
                  version = ui.color(tag, :yellow) if result.uniq.count != 1
                  version = ui.color('blocked', :red) if tag =~ /^\<.*0.0.0/

                  object_list << version

                else
                  object_list << ui.color("latest", :green)
                end
              end
            end

          end

        end
        puts ui.list(object_list, :uneven_columns_across, columns)
      end

    end
  end
end

....putting some color in the output.....

< 0.0.0 versions that are applied mean that the cookbook is blocked on the environment.
No the output shows blocked in red to quickly notify these blocks.

Cookbook versions that mismatch will be displayed in yellow.

Added the option -m / --mismatch to only display mismatching versions in the output.