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# Copyright (C) 2011 Canonical Ltd.
# Copyright (C) 2012 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 Etc Hosts: Update the hosts file (usually ``/etc/hosts``)"""
import logging
from cloudinit import lifecycle, templater, util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema
from cloudinit.settings import PER_ALWAYS
meta: MetaSchema = {
"id": "cc_update_etc_hosts",
"distros": ["all"],
"frequency": PER_ALWAYS,
"activate_by_schema_keys": ["manage_etc_hosts"],
}
LOG = logging.getLogger(__name__)
def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
manage_hosts = util.get_cfg_option_str(cfg, "manage_etc_hosts", False)
hosts_fn = cloud.distro.hosts_fn
if util.translate_bool(manage_hosts, addons=["template"]):
if manage_hosts == "template":
lifecycle.deprecate(
deprecated="Value 'template' for key 'manage_etc_hosts'",
deprecated_version="22.2",
extra_message="Use 'true' instead.",
)
(hostname, fqdn, _) = util.get_hostname_fqdn(cfg, cloud)
if not hostname:
LOG.warning(
"Option 'manage_etc_hosts' was set, but no hostname was found"
)
return
# Render from a template file
tpl_fn_name = cloud.get_template_filename(
"hosts.%s" % (cloud.distro.osfamily)
)
if not tpl_fn_name:
raise RuntimeError(
"No hosts template could be found for distro %s"
% (cloud.distro.osfamily)
)
templater.render_to_file(
tpl_fn_name, hosts_fn, {"hostname": hostname, "fqdn": fqdn}
)
elif manage_hosts == "localhost":
(hostname, fqdn, _) = util.get_hostname_fqdn(cfg, cloud)
if not hostname:
LOG.warning(
"Option 'manage_etc_hosts' was set, but no hostname was found"
)
return
LOG.debug("Managing localhost in %s", hosts_fn)
cloud.distro.update_etc_hosts(hostname, fqdn)
else:
LOG.debug(
"Configuration option 'manage_etc_hosts' is not set,"
" not managing %s in module %s",
hosts_fn,
name,
)
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