Caching for a test-kitchen environment

.kitchen.local.yml

<%
require 'socket'

def local_ip
  @local_ip ||= begin
    # turn off reverse DNS resolution temporarily
    orig, Socket.do_not_reverse_lookup = Socket.do_not_reverse_lookup, true

    UDPSocket.open do |s|
      s.connect '64.233.187.99', 1
      s.addr.last
    end
  ensure
    Socket.do_not_reverse_lookup = orig
  end
end

def local_port ; 8123 ; end
def http_proxy_url ; "http://#{local_ip}:#{local_port}" ; end

def proxy_running?
  socket = TCPSocket.new(local_ip, local_port)
  true
rescue SocketError, Errno::ECONNREFUSED,
  Errno::EHOSTUNREACH, Errno::ENETUNREACH, IOError
  false
rescue Errno::EPERM, Errno::ETIMEDOUT
  false
ensure
  socket && socket.close
end
%>
---
<% if proxy_running? %>
driver:
  http_proxy: <%= http_proxy_url %>
  https_proxy: <%= http_proxy_url %>
  provision_command: "env http_proxy=<%= http_proxy_url %> bash -c 'curl -L http://www.getchef.com/chef/install.sh | bash'"
  vagrantfile_erb: Vagrantfile.erb

provisioner:
  chef_omnibus_url: http://www.getchef.com/chef/install.sh
  solo_rb:
    http_proxy: <%= http_proxy_url %>
    https_proxy: <%= http_proxy_url %>

<% end %>

README.md

Following a little research I summarised in test-kitchen/kitchen-vagrant#90, here are the file that could be added to a repo to get some caching... I will not add the polipo related files that can be found in https://gist.github.com/fnichol/7551540. Since the code is added only when a running polipo is found, this should not affect people who donnot have one running.

Vagrantfile.erb

Vagrant.configure("2") do |c|
  c.vm.box = "<%= config[:box] %>"
  c.vm.box_url = "<%= config[:box_url] %>"

  puts "http_proxy=<%= config[:http_proxy] %>"
  puts "Using the Vagrantfile.erb file."
<% if config[:http_proxy] %>
  if Vagrant.has_plugin?("vagrant-cachier")
    # Configure cached packages to be shared between instances of the same base box.
    # More info on http://fgrehm.viewdocs.io/vagrant-cachier/usage
    c.cache.scope = :box
  end
<% end %>

<% if config[:vm_hostname] %>
  c.vm.hostname = "<%= config[:vm_hostname] %>"
<% end %>
<% if config[:guest] %>
  c.vm.guest = <%= config[:guest] %>
<% end %>
<% if config[:username] %>
  c.ssh.username = "<%= config[:username] %>"
<% end %>
<% if config[:ssh_key] %>
  c.ssh.private_key_path = "<%= config[:ssh_key] %>"
<% end %>

<% Array(config[:network]).each do |opts| %>
  c.vm.network(:<%= opts[0] %>, <%= opts[1..-1].join(", ") %>)
<% end %>

  c.vm.synced_folder ".", "/vagrant", disabled: true
<% config[:synced_folders].each do |source, destination, options| %>
  c.vm.synced_folder "<%= source %>", "<%= destination %>", <%= options %>
<% end %>

  c.vm.provider :<%= config[:provider] %> do |p|
<% config[:customize].each do |key, value| %>
  <% case config[:provider]
       when "virtualbox" %>
    p.customize ["modifyvm", :id, "--<%= key %>", "<%= value %>"]
    <% when "rackspace", "softlayer" %>
    p.<%= key %> = "<%= value%>"
    <% when /^vmware_/ %>
      <% if key == :memory %>
        <% unless config[:customize].include?(:memsize) %>
    p.vmx["memsize"] = "<%= value %>"
      <% end %>
    <% else %>
    p.vmx["<%= key %>"] = "<%= value %>"
    <% end %>
  <% end %>
<% end %>
  end

end