Vendor the external cookbooks

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

cookbooks/apt/recipes/unattended-upgrades.rb

@@ -0,0 +1,47 @@
+#
+# Cookbook:: apt
+# Recipe:: unattended-upgrades
+#
+# Copyright:: 2014-2017, 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.
+#
+
+# On systems where apt is not installed, the resources in this recipe are not
+# executed. However, they _must_ still be present in the resource collection
+# or other cookbooks which notify these resources will fail on non-apt-enabled
+# systems.
+#
+
+package 'unattended-upgrades' do
+  response_file 'unattended-upgrades.seed.erb'
+  action :install
+end
+
+package 'bsd-mailx' do
+  not_if { node['apt']['unattended_upgrades']['mail'].nil? }
+end
+
+template '/etc/apt/apt.conf.d/20auto-upgrades' do
+  owner 'root'
+  group 'root'
+  mode '0644'
+  source '20auto-upgrades.erb'
+end
+
+template '/etc/apt/apt.conf.d/50unattended-upgrades' do
+  owner 'root'
+  group 'root'
+  mode '0644'
+  source '50unattended-upgrades.erb'
+end