First stab at setting up a lxc container for developing the gem itself

development/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+def local_cache(box_name)
+  cache_dir = File.join(File.expand_path(Vagrant::Environment::DEFAULT_HOME),
+                        'cache',
+                        'apt',
+                        box_name)
+  partial_dir = File.join(cache_dir, 'partial')
+  FileUtils.mkdir_p(partial_dir) unless File.exists? partial_dir
+  cache_dir
+end
+
+Vagrant.require_plugin 'vagrant-lxc'
+
+Vagrant.configure("2") do |config|
+  config.vm.box      = "lxc-quantal64"
+  config.vm.box_url  = 'http://dl.dropbox.com/u/13510779/lxc-quantal64-2013-03-08.box'
+  config.vm.hostname = 'lxc-quantal64'
+
+  config.vm.synced_folder "../", "/vagrant", name: 'vagrant-root'
+
+  cache_dir = local_cache(config.vm.box)
+  config.vm.synced_folder cache_dir,
+                          "/var/cache/apt/archives/",
+                          name: "vagrant-cache"
+
+  config.vm.provider :lxc do |lxc|
+    # Not sure we need this
+    lxc.start_opts << 'lxc.aa_profile=unconfined'
+  end
+
+  config.vm.provision :shell, inline: '
+    if ! [ -f /home/vagrant/.updated ]; then
+      sudo apt-get update &&
+      sudo apt-get install puppet -y &&
+      touch /home/vagrant/.updated
+    fi'
+
+  config.vm.provision :puppet do |puppet|
+    puppet.manifests_path = "."
+    puppet.manifest_file  = "site.pp"
+    # Pass DEBUG=1 to vagrant commands if you want to make some debugging noise
+    puppet.options << [ '--verbose', '--debug' ] if ENV['DEBUG'] == '1'
+  end
+end

development/lxc-configs/lxc-dev-default

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+###############################################################################
+# This file has the same configs as the built in /etc/default/lxc on Ubuntu,
+# we only changed IPs to 10.0.254.* to avoid collision with LXC default 10.0.3.*
+# which is likely to be running from the host machine
+###############################################################################
+
+
+# MIRROR to be used by ubuntu template at container creation:
+# Leaving it undefined is fine
+#MIRROR="http://archive.ubuntu.com/ubuntu"
+# or
+#MIRROR="http://<host-ip-addr>:3142/archive.ubuntu.com/ubuntu"
+
+# LXC_AUTO - whether or not to start containers symlinked under
+# /etc/lxc/auto
+LXC_AUTO="true"
+
+# Leave USE_LXC_BRIDGE as "true" if you want to use lxcbr0 for your
+# containers.  Set to "false" if you'll use virbr0 or another existing
+# bridge, or mavlan to your host's NIC.
+USE_LXC_BRIDGE="true"
+
+# If you change the LXC_BRIDGE to something other than lxcbr1, then
+# you will also need to update your /etc/lxc/lxc.conf as well as the
+# configuration (/var/lib/lxc/<container>/config) for any containers
+# already created using the default config to reflect the new bridge
+# name.
+# If you have the dnsmasq daemon installed, you'll also have to update
+# /etc/dnsmasq.d/lxc and restart the system wide dnsmasq daemon.
+LXC_BRIDGE="lxcbr1"
+LXC_ADDR="10.0.254.1"
+LXC_NETMASK="255.255.255.0"
+LXC_NETWORK="10.0.254.0/24"
+LXC_DHCP_RANGE="10.0.254.2,10.0.254.254"
+LXC_DHCP_MAX="253"
+
+LXC_SHUTDOWN_TIMEOUT=120

development/setup-lxc-dev-box

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+#!/usr/bin/env bash
+
+set -e
+
+# Package ubuntu-cloud
+if ! [ -f ../boxes/output/ubuntu-cloud.box ]; then
+  bundle exec rake boxes:build:ubuntu-cloud
+fi
+
+# Fresh start
+bundle exec vagrant-lxc destroy
+
+# Skip provisioning as we need to apt-get update first
+bundle exec vagrant-lxc up --provider=lxc --no-provision
+
+# Trigger an update from here instead of doing it from puppet as we don't need to
+# apt-get update every time we boot the container. If there is a way to do it
+# from puppet I don't know. If you do, feel free to send a pull request ;)
+bundle exec vagrant-lxc ssh -c '
+sudo sed -i -e "s/archive./br.archive./g" /etc/apt/sources.list &&
+sudo apt-get update'
+bundle exec vagrant-lxc provision
+
+# Reload the container just to ensure it can boot properly after the upgrades
+bundle exec vagrant-lxc reload

development/site.pp

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+Exec { path => [ '/bin/', '/sbin/' , '/usr/bin/', '/usr/sbin/', '/usr/local/bin'] }
+
+# Because I'm lazy ;)
+exec {
+  'echo "alias be=\"bundle exec\"" >> ~/.bashrc':
+    unless => 'grep -q "bundle exec" ~/.bashrc';
+
+  'echo "cd /vagrant" >> ~/.bashrc':
+    unless => 'grep -q "cd /vagrant" ~/.bashrc';
+}
+
+# Overwrite LXC default configs
+exec {
+  'config-lxc':
+     # We need to do this otherwise IPs will collide with the host's lxc dhcp server.
+     # If we install the package prior to setting this configs the container will go crazy.
+     command => 'cp /vagrant/development/lxc-configs/lxc-dev-default /etc/default/lxc',
+     unless  => 'grep -q "10.0.4" /etc/default/lxc'
+}
+
+# Install dependencies
+package {
+  [ 'libffi-dev', 'bsdtar', 'exuberant-ctags', 'ruby1.9.1-dev', 'htop', 'git', 'build-essential' ]:
+    ensure   => 'installed'
+  ;
+
+  'lxc':
+    require => Exec['config-lxc']
+  ;
+
+  'bundler':
+    ensure   => 'installed',
+    provider => 'gem'
+  ;
+}
+
+# Allow gems to be installed on vagrant user home avoiding "sudo"s
+# Tks to http://wiki.railsplayground.com/railsplayground/show/How+to+install+gems+and+non+root+user
+file {
+  '/home/vagrant/gems':
+    ensure => directory,
+    owner  => 'vagrant',
+    group  => 'vagrant'
+  ;
+
+  '/home/vagrant/.gemrc':
+    content => '
+---
+:verbose: true
+gem: --no-ri --no-rdoc
+:update_sources: true
+:sources:
+- http://gems.rubyforge.org
+- http://gems.github.com
+:backtrace: false
+:bulk_threshold: 1000
+:benchmark: false
+gemhome: $HOME/gems
+gempath:
+- /home/vagrant/gems
+- /usr/local/lib/ruby/gems/1.8
+'
+}
+exec {
+  'set-gem-paths':
+    command => 'cat << EOF >> /home/vagrant/.profile
+export GEM_HOME=/home/vagrant/gems
+export GEM_PATH=/home/vagrant/gems:/var/lib/gems/1.9.1
+export PATH=$PATH:/vagrant/gems/bin
+EOF',
+    unless => 'grep -q "GEM_HOME" /home/vagrant/.profile'
+}
+
+# Bundle!
+exec {
+  'su -l vagrant -c "cd /vagrant && bundle install"':
+    # We are checking for guard-rspec here but it could be any gem...
+    unless  => 'gem list guard | grep -q rspec',
+    cwd     => '/vagrant',
+    require => [
+      Exec['set-gem-paths'],
+      File['/home/vagrant/gems', '/home/vagrant/.gemrc'],
+      Package['bundler']
+    ]
+}
+
+# Setup vagrant default ssh key
+file {
+  '/home/vagrant/.ssh':
+    ensure => directory,
+    owner  => 'vagrant',
+    group  => 'vagrant'
+}
+exec {
+  'download-private-key':
+    command => 'wget https://raw.github.com/mitchellh/vagrant/master/keys/vagrant -O /home/vagrant/.ssh/id_rsa',
+    creates => '/home/vagrant/.ssh/id_rsa',
+    require => File['/home/vagrant/.ssh'],
+    user    => 'vagrant'
+  ;
+
+  'wget https://raw.github.com/mitchellh/vagrant/master/keys/vagrant.pub -O /home/vagrant/.ssh/id_rsa.pub':
+    creates => '/home/vagrant/.ssh/id_rsa.pub',
+    require => File['/home/vagrant/.ssh'],
+    user    => 'vagrant'
+  ;
+}
+file {
+  '/home/vagrant/.ssh/id_rsa':
+    ensure  => 'present',
+    mode    => '0600',
+    require => Exec['download-private-key']
+}