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

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require "vagrant/util/retryable"
require "vagrant/util/subprocess"
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require "vagrant-lxc/errors"
require "vagrant-lxc/driver/cli"
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require "etc"
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module Vagrant
module LXC
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class Driver
# This is raised if the container can't be found when initializing it with
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# a name.
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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)
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@container_name = container_name
@sudo_wrapper = sudo_wrapper
@cli = cli || CLI.new(sudo_wrapper, container_name)
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@logger = Log4r::Logger.new("vagrant::provider::lxc::driver")
@customizations = []
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end
def validate!
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raise ContainerNotFound if @container_name && ! @cli.list.include?(@container_name)
end
def all_containers
@cli.list
end
def base_path
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Pathname.new("#{CONTAINERS_PATH}/#{@container_name}")
end
def rootfs_path
Pathname.new(config_string.match(/^lxc\.rootfs\s+=\s+(.+)$/)[1])
end
def mac_address
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@mac_address ||= config_string.match(/^lxc\.network\.hwaddr\s*+=\s*+(.+)$/)[1]
end
def config_string
@sudo_wrapper.run('cat', base_path.join('config').to_s)
end
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def create(name, backingstore, backingstore_options, template_path, config_file, template_options = {})
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@cli.name = @container_name = name
import_template(template_path) do |template_name|
@logger.debug "Creating container..."
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@cli.create template_name, backingstore, backingstore_options, config_file, template_options
end
end
def share_folders(folders)
folders.each do |f|
share_folder(f[:hostpath], f[:guestpath], f.fetch(:mount_options, 'bind'))
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end
end
def share_folder(host_path, guest_path, mount_options = nil)
guest_path = guest_path.gsub(/^\//, '')
guest_full_path = rootfs_path.join(guest_path)
unless guest_full_path.directory?
begin
@logger.debug("Guest path doesn't exist, creating: #{guest_full_path}")
@sudo_wrapper.run('mkdir', '-p', guest_full_path.to_s)
rescue Errno::EACCES
raise Vagrant::Errors::SharedFolderCreateFailed, :path => guest_path.to_s
end
end
mount_options = Array(mount_options || ['bind'])
@customizations << ['mount.entry', "#{host_path} #{guest_path} none #{mount_options.join(',')} 0 0"]
end
def start(customizations)
@logger.info('Starting container...')
if ENV['LXC_START_LOG_FILE']
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extra = ['-o', ENV['LXC_START_LOG_FILE'], '-l', 'DEBUG']
end
prune_customizations
write_customizations(customizations + @customizations)
@cli.start(extra)
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end
def forced_halt
@logger.info('Shutting down container...')
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# 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 }
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end
def destroy
@cli.destroy
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end
def attach(*command)
@cli.attach(*command)
end
def version
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@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}"
@sudo_wrapper.run('tar', '--numeric-owner', '-cvzf', target_path, '-C',
rootfs_path.parent.to_s, "./#{rootfs_path.basename.to_s}")
@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
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if @container_name
@cli.state
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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'
contents = config_string
config_string.gsub! /^# VAGRANT-BEGIN(.|\s)*# VAGRANT-END/, ''
write_config(contents)
end
protected
def write_customizations(customizations)
customizations = customizations.map do |key, value|
"lxc.#{key}=#{value}"
end
customizations.unshift '# VAGRANT-BEGIN'
customizations << '# VAGRANT-END'
contents = config_string
config_file = base_path.join('config').to_s
customizations.each do |line|
contents << line
contents << "\n"
end
write_config(contents)
end
def write_config(contents)
Tempfile.new('lxc-config').tap do |file|
file.chmod 0644
file.write contents
file.close
@sudo_wrapper.run 'cp', '-f', file.path, base_path.join('config').to_s
@sudo_wrapper.run 'chown', 'root:root', base_path.join('config').to_s
end
end
def import_template(path)
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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
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end
end
end