Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/homebrew/libraries/homebrew_mixin.rb

@@ -0,0 +1,63 @@
+#
+# Author:: Joshua Timberman (<jtimberman@chef.io>)
+# Author:: Graeme Mathieson (<mathie@woss.name>)
+# Cookbook:: homebrew
+# Libraries:: homebrew_mixin
+#
+# Copyright:: 2011-2016, Chef Software, Inc.
+#
+# 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.
+#
+
+class Chef12HomebrewUser
+  include Chef::Mixin::HomebrewUser
+end
+
+module Homebrew
+  # Homebrew
+  module Mixin
+    def homebrew_owner
+      require 'etc'
+      @homebrew_owner ||= ::Etc.getpwuid(Chef12HomebrewUser.new.find_homebrew_uid).name
+    rescue Chef::Exceptions::CannotDetermineHomebrewOwner
+      @homebrew_owner ||= calculate_owner
+    end
+
+    private
+
+    def calculate_owner
+      owner = homebrew_owner_attr || sudo_user || current_user
+      if owner == 'root'
+        raise Chef::Exceptions::User,
+             "Homebrew owner is 'root' which is not supported. " \
+             "To set an explicit owner, please set node['homebrew']['owner']."
+      end
+      owner
+    end
+
+    def homebrew_owner_attr
+      node['homebrew']['owner']
+    end
+
+    def sudo_user
+      ENV['SUDO_USER']
+    end
+
+    def current_user
+      ENV['USER']
+    end
+  end
+end
+
+Chef::Resource.send(:include, Homebrew::Mixin)
+Chef::Recipe.send(:include, Homebrew::Mixin)

cookbooks/homebrew/libraries/matchers.rb

@@ -0,0 +1,28 @@
+if defined?(ChefSpec)
+  ChefSpec.define_matcher :homebrew_package
+
+  def tap_homebrew_tap(tap)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_tap, :tap, tap)
+  end
+
+  def untap_homebrew_tap(tap)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_tap, :untap, tap)
+  end
+
+  def cask_homebrew_cask(cask)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_cask, :cask, cask)
+  end
+
+  def uncask_homebrew_cask(cask)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_cask, :uncask, cask)
+  end
+
+  def install_homebrew_cask(cask)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_cask, :install, cask)
+  end
+
+  def uninstall_homebrew_cask(cask)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_cask, :uninstall, cask)
+  end
+
+end