vagrant-lxc-ng/lib/vagrant-lxc/container.rb

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# FIXME: Ruby 1.8 users dont have SecureRandom
require 'securerandom'
require "vagrant-lxc/errors"
require "vagrant-lxc/container/cli"
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require "vagrant/util/retryable"
require "vagrant/util/subprocess"
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module Vagrant
module LXC
class Container
# Root folder where containers are stored
CONTAINERS_PATH = '/var/lib/lxc'
# Default LXC configs
LXC_DEFAULTS_PATH = '/etc/default/lxc'
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# Include this so we can use `Subprocess` more easily.
include Vagrant::Util::Retryable
# This is raised if the container can't be found when initializing it with
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# a name.
class NotFound < StandardError; end
attr_reader :name
def initialize(name, cli = CLI.new(name))
@name = name
@cli = cli
@logger = Log4r::Logger.new("vagrant::provider::lxc::container")
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end
def validate!
raise NotFound if @name && ! @cli.list.include?(@name)
end
def base_path
Pathname.new("#{CONTAINERS_PATH}/#{@name}")
end
def rootfs_path
Pathname.new("#{base_path}/rootfs")
end
def create(metadata = {})
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# FIXME: Ruby 1.8 users dont have SecureRandom
@logger.debug('Creating container using lxc-create...')
@name = SecureRandom.hex(6)
public_key = Vagrant.source_root.join('keys', 'vagrant.pub').expand_path.to_s
meta_opts = metadata.fetch('template-opts', {}).merge(
'--auth-key' => public_key,
'--cache' => metadata.fetch('rootfs-cache-path')
)
@cli.name = @name
@cli.create(metadata.fetch('template-name'), meta_opts)
@name
end
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def share_folders(folders, config)
folders.each do |folder|
guestpath = rootfs_path.join(folder[:guestpath].gsub(/^\//, ''))
unless guestpath.directory?
begin
system "sudo mkdir -p #{guestpath.to_s}"
rescue Errno::EACCES
raise Vagrant::Errors::SharedFolderCreateFailed,
:path => guestpath.to_s
end
end
# http://blog.smartlogicsolutions.com/2009/06/04/mount-options-to-improve-ext4-file-system-performance/
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config.start_opts << "lxc.mount.entry=#{folder[:hostpath]} #{guestpath} none bind 0 0"
end
end
def start(config)
@logger.info('Starting container...')
opts = config.start_opts.dup
if ENV['LXC_START_LOG_FILE']
opts.merge!('-o' => ENV['LXC_START_LOG_FILE'], '-l' => 'DEBUG')
end
@cli.transition_to(:running) { |c| c.start(opts) }
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end
def halt
@logger.info('Shutting down container...')
# TODO: issue an lxc-stop if a timeout gets reached
@cli.transition_to(:stopped) { |c| c.shutdown }
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end
def destroy
@cli.destroy
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end
def state
if @name
@cli.state
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end
end
def assigned_ip
unless File.read(base_path.join('config')) =~ /^lxc\.network\.hwaddr\s*=\s*([a-z0-9:]+)\s*$/
raise 'Unknown Container MAC Address'
end
mac_addr = $1
ip = ''
retryable(:on => LXC::Errors::ExecuteError, :tries => 10, :sleep => 3) do
# See: http://programminglinuxblog.blogspot.com.br/2007/11/detecting-ip-address-from-mac-address.html
unless ip = get_container_ip_from_arp(mac_addr)
# Ping subnet and try to get ip again
ping_subnet!
end
end
ip
end
def get_container_ip_from_arp(mac_addr)
r = raw 'arp', '-n'
# If the command was a failure then raise an exception that is nicely
# handled by Vagrant.
if r.exit_code != 0
if @interrupted
@logger.info("Exit code != 0, but interrupted. Ignoring.")
else
raise LXC::Errors::ExecuteError, :command => ['arp', '-n'].inspect
end
end
if r.stdout.gsub("\r\n", "\n").strip =~ /^([0-9.]+).+#{Regexp.escape mac_addr}/
return $1.to_s
end
end
# FIXME: Should output an error friendly message in case fping is not installed
def ping_subnet!
raise LXC::Errors::UnknownLxcConfigFile unless File.exists?(LXC_DEFAULTS_PATH)
raise LXC::Errors::UnknownLxcBridgeAddress unless
File.read(LXC_DEFAULTS_PATH) =~ /^LXC_ADDR\="?([0-9.]+)"?.*$/
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cmd = ['fping', '-c', '1', '-g', '-q', "#{$1}/24"]
raw(*cmd)
raise LXC::Errors::ExecuteError, :command => cmd.inspect
end
# TODO: Review code below this line, it was pretty much a copy and paste from VirtualBox base driver
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def raw(*command, &block)
int_callback = lambda do
@interrupted = true
@logger.info("Interrupted.")
end
# Append in the options for subprocess
command << { :notify => [:stdout, :stderr] }
Vagrant::Util::Busy.busy(int_callback) do
Vagrant::Util::Subprocess.execute(*command, &block)
end
end
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end
end
end