vagrant/plugins/providers/virtualbox/action/sane_defaults.rb

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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
# Enable the host IO cache on the sata controller. Note that
# if this fails then its not a big deal, so we don't raise any
# errors. The Host IO cache vastly improves disk IO performance
# for VMs.
command = [
"storagectl", env[:machine].id,
"--name", "SATA Controller",
"--hostiocache", "on"
]
attempt_and_log(command, "Enabling the Host I/O cache on the SATA controller...")
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.
#
# @param [Array] command Command to run
# @param [String] log Log message to write.
def attempt_and_log(command, log)
result = @env[:machine].provider.driver.execute_command(command)
@logger.info("#{log} (exit status = #{result.exit_code})")
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