474b7f259d
to be behind trunk. `tox -e py27` passes full test suite. Now to work on replacing mocker.
117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2013 Craig Tracey
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# Copyright (C) 2013 Hewlett-Packard Development Company, L.P.
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#
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# Author: Craig Tracey <craigtracey@gmail.com>
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# Author: Juerg Haefliger <juerg.haefliger@hp.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Note:
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# This module is intended to manage resolv.conf in environments where
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# early configuration of resolv.conf is necessary for further
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# bootstrapping and/or where configuration management such as puppet or
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# chef own dns configuration. As Debian/Ubuntu will, by default, utilize
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# resovlconf, and similarly RedHat will use sysconfig, this module is
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# likely to be of little use unless those are configured correctly.
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#
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# For RedHat with sysconfig, be sure to set PEERDNS=no for all DHCP
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# enabled NICs. And, in Ubuntu/Debian it is recommended that DNS
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# be configured via the standard /etc/network/interfaces configuration
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# file.
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#
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#
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# Usage Example:
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#
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# #cloud-config
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# manage_resolv_conf: true
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#
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# resolv_conf:
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# nameservers: ['8.8.4.4', '8.8.8.8']
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# searchdomains:
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# - foo.example.com
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# - bar.example.com
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# domain: example.com
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# options:
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# rotate: true
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# timeout: 1
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#
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from cloudinit import log as logging
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from cloudinit.settings import PER_INSTANCE
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from cloudinit import templater
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from cloudinit import util
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LOG = logging.getLogger(__name__)
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frequency = PER_INSTANCE
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distros = ['fedora', 'rhel', 'sles']
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def generate_resolv_conf(template_fn, params, target_fname="/etc/resolv.conf"):
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flags = []
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false_flags = []
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if 'options' in params:
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for key, val in params['options'].items():
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if isinstance(val, bool):
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if val:
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flags.append(key)
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else:
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false_flags.append(key)
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for flag in flags + false_flags:
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del params['options'][flag]
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if not params.get('options'):
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params['options'] = {}
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params['flags'] = flags
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LOG.debug("Writing resolv.conf from template %s" % template_fn)
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templater.render_to_file(template_fn, target_fname, params)
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def handle(name, cfg, cloud, log, _args):
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"""
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Handler for resolv.conf
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@param name: The module name "resolv-conf" from cloud.cfg
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@param cfg: A nested dict containing the entire cloud config contents.
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@param cloud: The L{CloudInit} object in use.
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@param log: Pre-initialized Python logger object to use for logging.
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@param args: Any module arguments from cloud.cfg
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"""
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if "manage_resolv_conf" not in cfg:
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log.debug(("Skipping module named %s,"
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" no 'manage_resolv_conf' key in configuration"), name)
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return
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if not util.get_cfg_option_bool(cfg, "manage_resolv_conf", False):
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log.debug(("Skipping module named %s,"
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" 'manage_resolv_conf' present but set to False"), name)
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return
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if "resolv_conf" not in cfg:
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log.warn("manage_resolv_conf True but no parameters provided!")
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template_fn = cloud.get_template_filename('resolv.conf')
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if not template_fn:
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log.warn("No template found, not rendering /etc/resolv.conf")
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return
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generate_resolv_conf(template_fn=template_fn, params=cfg["resolv_conf"])
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return
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