# 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.

"""
Set Hostname
------------
**Summary:** set hostname and fqdn

This module handles setting the system hostname and fqdn. If
``preserve_hostname`` is set, then the hostname will not be altered.

A hostname and fqdn can be provided by specifying a full domain name under the
``fqdn`` key. Alternatively, a hostname can be specified using the ``hostname``
key, and the fqdn of the cloud wil be used. If a fqdn specified with the
``hostname`` key, it will be handled properly, although it is better to use
the ``fqdn`` config key. If both ``fqdn`` and ``hostname`` are set, ``fqdn``
will be used.

**Internal name:** per instance

**Supported distros:** all

**Config keys**::

    preserve_hostname: <true/false>
    fqdn: <fqdn>
    hostname: <fqdn/hostname>
"""

from cloudinit import util


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 setting the hostname in module %s"), name)
        return

    (hostname, fqdn) = util.get_hostname_fqdn(cfg, cloud)
    try:
        log.debug("Setting the hostname to %s (%s)", fqdn, hostname)
        cloud.distro.set_hostname(hostname, fqdn)
    except Exception:
        util.logexc(log, "Failed to set the hostname to %s (%s)", fqdn,
                    hostname)
        raise

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