vagrant-lxc-ng/lib/vagrant-lxc/driver.rb
2014-03-13 00:57:36 -03:00

203 lines
6.2 KiB
Ruby

require "vagrant/util/retryable"
require "vagrant/util/subprocess"
require "vagrant-lxc/errors"
require "vagrant-lxc/driver/cli"
require "etc"
module Vagrant
module LXC
class Driver
# This is raised if the container can't be found when initializing it with
# a name.
class ContainerNotFound < StandardError; end
# Root folder where container configs are stored
CONTAINERS_PATH = '/var/lib/lxc'
attr_reader :container_name,
:customizations
def initialize(container_name, sudo_wrapper, cli = nil)
@container_name = container_name
@sudo_wrapper = sudo_wrapper
@cli = cli || CLI.new(sudo_wrapper, container_name)
@logger = Log4r::Logger.new("vagrant::provider::lxc::driver")
@customizations = []
end
def validate!
raise ContainerNotFound if @container_name && ! @cli.list.include?(@container_name)
end
def all_containers
@cli.list
end
def base_path
Pathname.new("#{CONTAINERS_PATH}/#{@container_name}")
end
def rootfs_path
Pathname.new(config_string.match(/^lxc\.rootfs\s+=\s+(.+)$/)[1])
end
def mac_address
@mac_address ||= config_string.match(/^lxc\.network\.hwaddr\s*+=\s*+(.+)$/)[1]
end
def config_string
@sudo_wrapper.run('cat', base_path.join('config').to_s)
end
def create(name, template_path, config_file, template_options = {})
@cli.name = @container_name = name
import_template(template_path) do |template_name|
@logger.debug "Creating container..."
@cli.create template_name, config_file, template_options
end
end
def share_folders(folders)
folders.each do |folder|
share_folder(folder[:hostpath], folder[:guestpath])
end
end
def share_folder(host_path, guest_path)
guest_path = rootfs_path.join(guest_path.gsub(/^\//, ''))
unless guest_path.directory?
begin
@logger.debug("Guest path doesn't exist, creating: #{guest_path}")
@sudo_wrapper.run('mkdir', '-p', guest_path.to_s)
rescue Errno::EACCES
raise Vagrant::Errors::SharedFolderCreateFailed, :path => guest_path.to_s
end
end
@customizations << ['mount.entry', "#{host_path} #{guest_path} none bind 0 0"]
end
def start(customizations)
@logger.info('Starting container...')
if ENV['LXC_START_LOG_FILE']
extra = ['-o', ENV['LXC_START_LOG_FILE'], '-l', 'DEBUG']
end
prune_customizations
write_customizations(customizations + @customizations)
@cli.start(extra)
end
def forced_halt
@logger.info('Shutting down container...')
# TODO: Remove `lxc-shutdown` usage, graceful halt is enough
@cli.transition_to(:stopped) { |c| c.shutdown }
# REFACTOR: Do not use exception to control the flow
rescue CLI::TargetStateNotReached, CLI::ShutdownNotSupported
@cli.transition_to(:stopped) { |c| c.stop }
end
def destroy
@cli.destroy
end
def attach(*command)
@cli.attach(*command)
end
def version
@version ||= @cli.version
end
# TODO: This needs to be reviewed and specs needs to be written
def compress_rootfs
# TODO: Pass in tmpdir so we can clean up from outside
target_path = "#{Dir.mktmpdir}/rootfs.tar.gz"
@logger.info "Compressing '#{rootfs_path}' rootfs to #{target_path}"
# "vagrant package" will copy the existing lxc-template in the new box file
# To keep this function backwards compatible with existing boxes, the path
# included in the tarball needs to have the same amount of path components (2)
# that will be stripped before extraction, hence the './.'
# TODO: This should be reviewed before 1.0
cmds = [
"cd #{base_path}",
"rm -f rootfs.tar.gz",
"tar --numeric-owner -czf #{target_path} -C #{rootfs_path} './.'"
]
@sudo_wrapper.su_c(cmds.join(' && '))
@logger.info "Changing rootfs tarball owner"
user_details = Etc.getpwnam(Etc.getlogin)
@sudo_wrapper.run('chown', "#{user_details.uid}:#{user_details.gid}", target_path)
target_path
end
def state
if @container_name
@cli.state
end
end
def prune_customizations
# Use sed to just strip out the block of code which was inserted by Vagrant
@logger.debug 'Prunning vagrant-lxc customizations'
@sudo_wrapper.su_c("sed -e '/^# VAGRANT-BEGIN/,/^# VAGRANT-END/ d' -ibak #{base_path.join('config')}")
end
protected
def write_customizations(customizations)
customizations = customizations.map do |key, value|
"lxc.#{key}=#{value}"
end
customizations.unshift '# VAGRANT-BEGIN'
customizations << '# VAGRANT-END'
config_file = base_path.join('config').to_s
customizations.each do |line|
@sudo_wrapper.su_c("echo '#{line}' >> #{config_file}")
end
end
def import_template(path)
template_name = "vagrant-tmp-#{@container_name}"
tmp_template_path = templates_path.join("lxc-#{template_name}").to_s
@logger.info 'Copying LXC template into place'
@sudo_wrapper.run('cp', path, tmp_template_path)
@sudo_wrapper.run('chmod', '+x', tmp_template_path)
yield template_name
ensure
@logger.info 'Removing LXC template'
if tmp_template_path
@sudo_wrapper.run('rm', tmp_template_path)
end
end
TEMPLATES_PATH_LOOKUP = %w(
/usr/share/lxc/templates
/usr/lib/lxc/templates
/usr/lib64/lxc/templates
/usr/local/lib/lxc/templates
)
def templates_path
return @templates_path if @templates_path
path = TEMPLATES_PATH_LOOKUP.find { |candidate| File.directory?(candidate) }
if !path
raise Errors::TemplatesDirMissing.new paths: TEMPLATES_PATH_LOOKUP.inspect
end
@templates_path = Pathname(path)
end
end
end
end