blob: bcc9fc7e25007316cad51f6d35e4b5287f1218ff [file] [log] [blame]
# Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import dbus
import logging
import os
import tempfile
import time
import ConfigParser
from autotest_lib.client.bin import utils
from autotest_lib.client.common_lib import error
def avahi_config(options, src_file='/etc/avahi/avahi-daemon.conf'):
"""Creates a temporary avahi-daemon.conf file with the specified changes.
Avahi daemon uses a text configuration file with sections and values
assigned to options on that section. This function creates a new config
file based on the one provided and a set of changes. The changes are
specified as triples of section, option and value that override the existing
options on the config file. If a value of None is specified for any triplet,
the corresponding option will be removed from the file.
@param options: A list of triplets of the form (section, option, value).
@param src_file: The default config file to use as a base for the changes.
@return: The filename of a temporary file with the new configuration file.
conf = ConfigParser.SafeConfigParser()
for section, option, value in options:
if value is None:
conf.remove_option(section, option)
conf.set(section, option, value)
fd, tempfn = tempfile.mkstemp(prefix='avahi-conf')
# ConfigParser writes the options as "key = value\n" while avahi-daemon only
# accepts them in the form of "key=value\n".
with open(tempfn, 'w') as f:
for section in conf.sections():
f.write('[%s]\n' % section)
for option in conf.options(section):
f.write('%s=%s\n' % (option, conf.get(section, option)))
return tempfn
def avahi_ping():
"""Returns True when the avahi-deamon's DBus interface is ready.
After your launch avahi-daemon, there is a short period of time where the
daemon is running but the DBus interface isn't ready yet. This functions
blocks for a few seconds waiting for a ping response from the DBus API
and returns wether it got a response.
bus = dbus.SystemBus()
ret = bus.call_blocking(
bus_name='org.freedesktop.Avahi', object_path='/',
signature='', args=[], timeout=2.0)
except dbus.exceptions.DBusException:
return False
logging.debug('org.freedesktop.Avahi.GetState() = %r', ret)
def avahi_start(config_file=None):
"""Start avahi-daemon with the provided config file.
This function waits until the avahi-daemon is ready listening on the DBus
interface. If avahi fails to be ready after 10 seconds, an error is raised.
@param config_file: The filename of the avahi-daemon config file or None to
use the default.
env = ''
if not config_file is None:
env = ' AVAHI_DAEMON_CONF="%s"' % config_file
utils.system('start avahi' + env, ignore_status=False)
# Wait until avahi is ready.
deadline = time.time() + 10.
while time.time() < deadline:
if avahi_ping():
raise error.TestError("avahi-daemon isn't ready after 10s running.")
def avahi_stop():
"""Stop the avahi daemon."""
utils.system('stop avahi')
def avahi_start_on_iface(iface):
"""Starts avahi daemon listening only on the provided interface.
@param iface: A string with the interface name.
opts = [('server', 'allow-interfaces', iface),
('server', 'deny-interfaces', None)]
conf = avahi_config(opts)