README.md

./rocker # will create a container named default from the Dockerfile
./rocker foo # will create a container named foo from the Dockerfile

Dockerfile

FROM ubuntu
RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
RUN apt-get update
RUN apt-get install -y x11vnc xvfb firefox
RUN mkdir /home/ubuntu/.vnc
RUN x11vnc -storepasswd 1234 /home/ubuntu/.vnc/passwd
RUN bash -c 'echo "firefox" >> /home/ubuntu/.bashrc'

rocker

#!/usr/bin/env ruby
require 'lxc'

class Docker2LXC


  attr_reader :ct

  def initialize(name)
    @ct = LXC::Container.new name
  end

  def from(template)
    ct.create(template)
    ct.start
    puts "Successfully created container, starting it, sleeping for 5 seconds till the container get ip"
    sleep 5
  end

  def run(*args)
   env = {'PATH'=>'/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin',
          'USER' => 'root', 'HOME'=>'/root' }
   command = args.join(' ') 
   puts "Executing: '#{command}'"
   ret = ct.attach(wait: true) do
     pid = spawn(env, command, :unsetenv_others=>true)
     Process.wait pid
   end
   puts "Exit code :#{ret}"
  end

  def expose(ct_port, host_port=nil)
    host_port = ct_port if host_port.nil?
    # setup ip tables port forwarding here, using chef or pupper or raw spawn
  end

  def self.build(name)
    d = Docker2LXC.new(name)
    File.readlines('Dockerfile').each do |line|
      code_line = line.sub(/\#.*^/,'').strip
      next if code_line.empty?
      method, *args = code_line.split(/\s+/)
      d.send(method.downcase.to_sym, *args)
    end
  end
end

if $0 == __FILE__
  name = ARGV.empty? ? 'default' : ARGV.first
  Docker2LXC.build(name)
end