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, backingstore, backingstore_options, 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, 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')) 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'] 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}" @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 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' contents = config_string contents.gsub! /^# VAGRANT-BEGIN(.|\s)*# VAGRANT-END\n/, '' 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\n" contents = config_string contents << customizations.join("\n") 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) 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