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# Copyright (C) 2015 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
"""
Fan
---
**Summary:** configure ubuntu fan networking
This module installs, configures and starts the ubuntu fan network system. For
more information about Ubuntu Fan, see:
``https://wiki.ubuntu.com/FanNetworking``.
If cloud-init sees a ``fan`` entry in cloud-config it will:
- write ``config_path`` with the contents of the ``config`` key
- install the package ``ubuntu-fan`` if it is not installed
- ensure the service is started (or restarted if was previously running)
**Internal name:** ``cc_fan``
**Module frequency:** per instance
**Supported distros:** ubuntu
**Config keys**::
fan:
config: |
# fan 240
10.0.0.0/8 eth0/16 dhcp
10.0.0.0/8 eth1/16 dhcp off
# fan 241
241.0.0.0/8 eth0/16 dhcp
config_path: /etc/network/fan
"""
from cloudinit import log as logging
from cloudinit.settings import PER_INSTANCE
from cloudinit import util
LOG = logging.getLogger(__name__)
frequency = PER_INSTANCE
BUILTIN_CFG = {
'config': None,
'config_path': '/etc/network/fan',
}
def stop_update_start(service, config_file, content, systemd=False):
if systemd:
cmds = {'stop': ['systemctl', 'stop', service],
'start': ['systemctl', 'start', service],
'enable': ['systemctl', 'enable', service]}
else:
cmds = {'stop': ['service', 'stop'],
'start': ['service', 'start']}
def run(cmd, msg):
try:
return util.subp(cmd, capture=True)
except util.ProcessExecutionError as e:
LOG.warning("failed: %s (%s): %s", service, cmd, e)
return False
stop_failed = not run(cmds['stop'], msg='stop %s' % service)
if not content.endswith('\n'):
content += '\n'
util.write_file(config_file, content, omode="w")
ret = run(cmds['start'], msg='start %s' % service)
if ret and stop_failed:
LOG.warning("success: %s started", service)
if 'enable' in cmds:
ret = run(cmds['enable'], msg='enable %s' % service)
return ret
def handle(name, cfg, cloud, log, args):
cfgin = cfg.get('fan')
if not cfgin:
cfgin = {}
mycfg = util.mergemanydict([cfgin, BUILTIN_CFG])
if not mycfg.get('config'):
LOG.debug("%s: no 'fan' config entry. disabling", name)
return
util.write_file(mycfg.get('config_path'), mycfg.get('config'), omode="w")
distro = cloud.distro
if not util.which('fanctl'):
distro.install_packages(['ubuntu-fan'])
stop_update_start(
service='ubuntu-fan', config_file=mycfg.get('config_path'),
content=mycfg.get('config'), systemd=distro.uses_systemd())
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