require "log4r" module VagrantPlugins module ProviderVirtualBox module Action class SaneDefaults def initialize(app, env) @logger = Log4r::Logger.new("vagrant::action::vm::sanedefaults") @app = app end def call(env) # Set the env on an instance variable so we can access it in # helpers. @env = env # Use rtcuseutc so that the VM sees UTC time. command = ["modifyvm", env[:machine].id, "--rtcuseutc", "on"] attempt_and_log(command, "Enabling rtcuseutc...") if env[:machine].provider_config.auto_nat_dns_proxy @logger.info("Automatically figuring out whether to enable/disable NAT DNS proxy...") # Enable/disable the NAT DNS proxy as necessary if enable_dns_proxy? command = ["modifyvm", env[:machine].id, "--natdnsproxy1", "on"] attempt_and_log(command, "Enable the NAT DNS proxy on adapter 1...") else command = ["modifyvm", env[:machine].id, "--natdnsproxy1", "off" ] attempt_and_log(command, "Disable the NAT DNS proxy on adapter 1...") command = ["modifyvm", env[:machine].id, "--natdnshostresolver1", "off" ] attempt_and_log(command, "Disable the NAT DNS resolver on adapter 1...") end else @logger.info("NOT trying to automatically manage NAT DNS proxy.") end @app.call(env) end protected # This is just a helper method that executes a single command, logs # the given string to the log, and also includes the exit status in # the log message. # # We assume every command is idempotent and pass along the `retryable` # flag. This is because VBoxManage is janky about running simultaneously # on the same box, and if we up multiple boxes at the same time, a bunch # of modifyvm commands get fired # # @param [Array] command Command to run # @param [String] log Log message to write. def attempt_and_log(command, log) begin @env[:machine].provider.driver.execute_command( command + [retryable: true]) rescue Vagrant::Errors::VBoxManageError => e @logger.info("#{log} (error = #{e.inspect})") end end # This uses some heuristics to determine if the NAT DNS proxy should # be enabled or disabled. See the comments within the function body # itself to see the checks it does. # # @return [Boolean] def enable_dns_proxy? begin contents = File.read("/etc/resolv.conf") if contents =~ /^nameserver 127\.0\.(0|1)\.1$/ # The use of both natdnsproxy and natdnshostresolver break on # Ubuntu 12.04 and 12.10 that uses resolvconf with localhost. When used # VirtualBox will give the client dns server 10.0.2.3, while # not binding to that address itself. Therefore disable this # feature if host uses the resolvconf server 127.0.0.1 or # 127.0.1.1 @logger.info("Disabling DNS proxy since resolv.conf contains 127.0.0.1 or 127.0.1.1") return false end rescue Errno::ENOENT; end return true end end end end end