Vendor the external cookbooks

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

cookbooks/homebrew/providers/cask.rb

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+#
+# Cookbook:: homebrew
+# Providers:: cask
+#
+# 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.
+#
+
+include ::Homebrew::Mixin
+
+use_inline_resources
+
+def whyrun_supported?
+  true
+end
+
+action :install do
+  execute "installing cask #{new_resource.name}" do
+    command "/usr/local/bin/brew cask install #{new_resource.name} #{new_resource.options}"
+    user homebrew_owner
+    environment lazy { { 'HOME' => ::Dir.home(homebrew_owner), 'USER' => homebrew_owner } }
+    not_if { new_resource.casked? }
+  end
+end
+
+action :uninstall do
+  execute "uninstalling cask #{new_resource.name}" do
+    command "/usr/local/bin/brew cask uninstall #{new_resource.name}"
+    user homebrew_owner
+    environment lazy { { 'HOME' => ::Dir.home(homebrew_owner), 'USER' => homebrew_owner } }
+    only_if { new_resource.casked? }
+  end
+end
+
+alias_method :action_cask, :action_install
+alias_method :action_uncask, :action_uninstall

cookbooks/homebrew/providers/tap.rb

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+#
+# Author:: Joshua Timberman (<jtimberman@chef.io>)
+# Author:: Graeme Mathieson (<mathie@woss.name>)
+# Cookbook:: homebrew
+# Providers:: tap
+#
+# 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.
+#
+
+include ::Homebrew::Mixin
+
+use_inline_resources
+
+def load_current_resource
+  @tap = Chef::Resource::HomebrewTap.new(new_resource.name)
+  tap_dir = @tap.name.gsub('/', '/homebrew-')
+
+  Chef::Log.debug("Checking whether we've already tapped #{new_resource.name}")
+  if ::File.directory?("/usr/local/Library/Taps/#{tap_dir}")
+    @tap.tapped true
+  else
+    @tap.tapped false
+  end
+end
+
+action :tap do
+  unless @tap.tapped
+    execute "tapping #{new_resource.name}" do
+      command "/usr/local/bin/brew tap #{new_resource.name}"
+      environment lazy { { 'HOME' => ::Dir.home(homebrew_owner), 'USER' => homebrew_owner } }
+      not_if "/usr/local/bin/brew tap | grep #{new_resource.name}"
+      user homebrew_owner
+    end
+  end
+end
+
+action :untap do
+  if @tap.tapped
+    execute "untapping #{new_resource.name}" do
+      command "/usr/local/bin/brew untap #{new_resource.name}"
+      environment lazy { { 'HOME' => ::Dir.home(homebrew_owner), 'USER' => homebrew_owner } }
+      only_if "/usr/local/bin/brew tap | grep #{new_resource.name}"
+      user homebrew_owner
+    end
+  end
+end