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

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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'
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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.join('config').read.match(/^lxc\.rootfs\s+=\s+(.+)$/)[1])
end
def create(base_name, target_rootfs_path, metadata = {})
@logger.debug('Creating container using lxc-create...')
@name = "#{base_name}-#{SecureRandom.hex(6)}"
public_key = Vagrant.source_root.join('keys', 'vagrant.pub').expand_path.to_s
meta_opts = metadata.fetch('template-opts', {}).merge(
'--auth-key' => public_key,
'--tarball' => metadata.fetch('rootfs-tarball').to_s
)
@cli.name = @name
@cli.create(metadata.fetch('template-name'), target_rootfs_path, meta_opts)
@name
end
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def share_folders(folders, config)
folders.each do |folder|
guestpath = rootfs_path.join(folder[:guestpath].gsub(/^\//, ''))
unless guestpath.directory?
begin
system "sudo mkdir -p #{guestpath.to_s}"
rescue Errno::EACCES
raise Vagrant::Errors::SharedFolderCreateFailed,
:path => guestpath.to_s
end
end
config.start_opts << "lxc.mount.entry=#{folder[:hostpath]} #{guestpath} none bind 0 0"
end
end
def start(config)
@logger.info('Starting container...')
opts = config.start_opts.dup
if ENV['LXC_START_LOG_FILE']
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extra = ['-o', ENV['LXC_START_LOG_FILE'], '-l', 'DEBUG']
end
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@cli.transition_to(:running) { |c| c.start(opts, (extra || nil)) }
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end
def halt
@logger.info('Shutting down container...')
# TODO: issue an lxc-stop if a timeout gets reached
@cli.transition_to(:stopped) { |c| c.shutdown }
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end
def destroy
@cli.destroy
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end
# TODO: This needs to be reviewed and specs needs to be written
def compress_rootfs
# TODO: Our template should not depend on container's arch
arch = base_path.join('config').read.match(/^lxc\.arch\s+=\s+(.+)$/)[1]
rootfs_dirname = File.dirname rootfs_path
basename = rootfs_path.to_s.gsub(/^#{Regexp.escape rootfs_dirname}\//, '')
# TODO: Pass in tmpdir so we can clean up from outside
target_path = "#{Dir.mktmpdir}/rootfs.tar.gz"
Dir.chdir base_path do
@logger.info "Compressing '#{rootfs_path}' rootfs to #{target_path}"
system "sudo rm -f rootfs.tar.gz && sudo bsdtar -s /#{basename}/rootfs-#{arch}/ --numeric-owner -czf #{target_path} #{basename}/* 2>/dev/null"
@logger.info "Changing rootfs tarbal owner"
system "sudo chown #{ENV['USER']}:#{ENV['USER']} #{target_path}"
end
target_path
end
def state
if @name
@cli.state
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end
end
def assigned_ip
ip = ''
retryable(:on => LXC::Errors::ExecuteError, :tries => 10, :sleep => 3) do
unless ip = get_container_ip_from_ifconfig
# retry
raise LXC::Errors::ExecuteError, :command => "lxc-attach"
end
end
ip
end
def get_container_ip_from_ifconfig
output = @cli.attach '/sbin/ifconfig', '-v', 'eth0', namespaces: 'network'
if output =~ /\s+inet addr:([0-9.]+)\s+/
return $1.to_s
end
end
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end
end
end