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# Copyright (C) 2011 Canonical Ltd.
# Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""
Update Hostname
---------------
**Summary:** update hostname and fqdn
This module will update the system hostname and fqdn. If ``preserve_hostname``
is set, then the hostname will not be altered.
.. note::
for instructions on specifying hostname and fqdn, see documentation for
``cc_set_hostname``
**Internal name:** ``cc_update_hostname``
**Module frequency:** per always
**Supported distros:** all
**Config keys**::
preserve_hostname: <true/false>
fqdn: <fqdn>
hostname: <fqdn/hostname>
"""
import os
from cloudinit.settings import PER_ALWAYS
from cloudinit import util
frequency = PER_ALWAYS
def handle(name, cfg, cloud, log, _args):
if util.get_cfg_option_bool(cfg, "preserve_hostname", False):
log.debug(("Configuration option 'preserve_hostname' is set,"
" not updating the hostname in module %s"), name)
return
(hostname, fqdn) = util.get_hostname_fqdn(cfg, cloud)
try:
prev_fn = os.path.join(cloud.get_cpath('data'), "previous-hostname")
log.debug("Updating hostname to %s (%s)", fqdn, hostname)
cloud.distro.update_hostname(hostname, fqdn, prev_fn)
except Exception:
util.logexc(log, "Failed to update the hostname to %s (%s)", fqdn,
hostname)
raise
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