Add LXC provider support to kitchen-vagrant

[tknerr]

This PR add support for the vagrant-lxc provider customizations in the Vagrantfile.erb template.

Use it in .kitchen.yml like this (assuming that lxc is the VAGRANT_DEFAULT_PROVIDER):

---
driver:
  name: vagrant

platforms:
- name: ubuntu-12.04
  driver_config:
    box: 'fgrehm/precise64-lxc'
    customize:
      container_name: 'mysql'
      cgroup.memory.limit_in_bytes: '128M'
      cgroup.cpuset.cpus: '0,1'
      backingstore: 'lvm'
      backingstore_options: { vgname: 'schroots', fstype: 'xfs', fssize: '5G' }

It will generate a Vagrantfile like this:

Vagrant.configure("2") do |c|
  c.vm.box = "fgrehm/precise64-lxc"
  c.vm.hostname = "default-ubuntu-1204"
  c.vm.synced_folder ".", "/vagrant", disabled: true
  c.vm.provider :lxc do |p|
    p.container_name = 'mysql'
    p.customize "cgroup.memory.limit_in_bytes", "128M"
    p.customize "cgroup.cpuset.cpus", "0,1"
    p.backingstore = "lvm"
    p.backingstore_option "--vgname", "schroots"
    p.backingstore_option "--fstype", "xfs"
    p.backingstore_option "--fssize", "5G"
  end
end

Considerations:

• if the container name is ":machine" it will be added as :machine in the Vagrantfile (don't know if there is a way to explicitly represent symbols in YAML)
• all the other options should be quite self explanatory given the example above. For a reference of the available configuration options see https://github.com/fgrehm/vagrant-lxc/blob/master/README.md#advanced-configuration

/cc @fgrehm

[tknerr]

Any news on this one? do you need something else for this PR to be merged?

Not sure whether @fgrehm might want to chime in for a review.

I'm using it here on an Ubuntu / LXC box (with KITCHEN_LOCAL_YAML=.kitchen.lxc.yml)and it works fine so far:
https://github.com/tknerr/sample-toplevel-cookbook/blob/master/.kitchen.lxc.yml
https://github.com/tknerr/sample-toplevel-cookbook/blob/master/Gemfile#L17-19

[fgrehm]

I don't have experience with kitchen-vagrant but by the looks of the patch I'd say 😄

[tknerr]

@fnichol @sethvargo any chance this will get merged before the next release?

[fnichol]

@tknerr Sorry this took so long--I rebased this PR and added some specs (now that we can) in 1a43f54. This will ship with the next release. Thanks!!

[tknerr]

@fnichol awesome, thanks! 👍 👍 👍

[fnichol]

@tknerr Thank you!!