Vendor the external cookbooks

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

cookbooks/nginx/libraries/helpers.rb

@@ -0,0 +1,38 @@
+#
+# Cookbook:: nginx
+# Library:: helpers
+#
+# Author:: Tim Smith (<tsmith@chef.io>)
+#
+# Copyright:: 2016-2017, 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.
+#
+
+# simple helper module for the nginx cookbook
+module NginxRecipeHelpers
+  # pidfile is hard to determine on Debian systems.
+  # Upstream packages and older distro releases use '/var/run/nginx.pid'
+  # systemd based distros and Ubuntu 14.04 use '/run/nginx.pid' for their
+  # packages
+  def pidfile_location
+    if (node['nginx']['repo_source'].nil? || %w(distro passenger).include?(node['nginx']['repo_source'])) &&
+       (node['init_package'] == 'systemd' || node['platform_version'].to_f == 14.04)
+      '/run/nginx.pid'
+    else
+      '/var/run/nginx.pid'
+    end
+  end
+end
+
+Chef::Resource.send(:include, NginxRecipeHelpers)

cookbooks/nginx/libraries/nginx_version.rb

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+class NginxVersion
+  include Comparable
+
+  attr_reader :version
+
+  def initialize(version)
+    @version = version
+  end
+
+  def <=>(other)
+    lhsegments = segments
+    rhsegments = other.segments
+
+    parts = [lhsegments.size, rhsegments.size].max
+
+    (0..(parts - 1)).each do |index|
+      lhs = lhsegments[index] || 0
+      rhs = rhsegments[index] || 0
+
+      next if lhs == rhs
+
+      return lhs <=> rhs
+    end
+
+    0
+  end
+
+  def to_s
+    version
+  end
+
+  protected
+
+  def segments
+    version.split('.').map { |part| Integer(part) }
+  end
+end