docker.rb

require 'mharris_ext'

#CONTAINER_ID=$(docker run -d base /bin/sh -c "while true; do echo hello world; sleep 1; done") && echo $CONTAINER_ID

module Docker
  class Instance
    include FromHash
    fattr(:commands) { [] }
    attr_accessor :container_id

    def run_str
      "docker run -d base /bin/sh -c #{command_str}"
    end
    def full_str
      "CONTAINER_ID=$(#{run_str}) && echo $CONTAINER_ID"
    end
    def command_str
      '"' + commands.join(" && ") + '"'
    end

    def start!
      self.container_id = ec full_str
    end

    def add_apt_install(*args)
      str = args.flatten.join(" ")
      self.commands << "DEBIAN_FRONTEND=noninteractive apt-get install -y -q #{str}"
    end
  end
end

d = Docker::Instance.new
#d.commands << "while true; do echo hello world; sleep 1; done"

d.add_apt_install "ruby1.9.1"
d.commands << "ruby -e 'puts :abc'"
puts d.full_str
d.start!
puts "ID: #{d.container_id}"