Vendor the external cookbooks

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

cookbooks/apt/recipes/cacher-client.rb

@@ -0,0 +1,52 @@
+#
+# Cookbook:: apt
+# Recipe:: cacher-client
+#
+# Copyright:: 2011-2017, 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.
+#
+
+# remove Acquire::http::Proxy lines from /etc/apt/apt.conf since we use 01proxy
+# these are leftover from preseed installs
+execute 'Remove proxy from /etc/apt/apt.conf' do
+  command "sed --in-place '/^Acquire::http::Proxy/d' /etc/apt/apt.conf"
+  only_if 'grep Acquire::http::Proxy /etc/apt/apt.conf'
+end
+
+if node['apt']['cacher_client']['cacher_server'].empty?
+  Chef::Log.warn("No cache server defined in node['apt']['cacher_client']['cacher_server']. Not setting up caching")
+  f = file '/etc/apt/apt.conf.d/01proxy' do
+    action(node['apt']['compiletime'] ? :nothing : :delete)
+  end
+  f.run_action(:delete) if node['apt']['compiletime']
+else
+  apt_update 'update for notification' do
+    action :nothing
+  end
+
+  t = template '/etc/apt/apt.conf.d/01proxy' do
+    source '01proxy.erb'
+    owner 'root'
+    group 'root'
+    mode '0644'
+    variables(
+      server: node['apt']['cacher_client']['cacher_server']
+    )
+    action(node['apt']['compiletime'] ? :nothing : :create)
+    notifies :update, 'apt_update[update for notification]', :immediately
+  end
+  t.run_action(:create) if node['apt']['compiletime']
+end
+
+include_recipe 'apt::default'