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# This file is part of cloud-init. See LICENSE file for license information.
import logging
import os
from abc import ABC, abstractmethod
from typing import Iterable, List, Type
from cloudinit import subp
from cloudinit import util
from cloudinit.net.eni import available as eni_available
from cloudinit.net.netplan import available as netplan_available
from cloudinit.net.network_state import NetworkState
from cloudinit.net.sysconfig import NM_CFG_FILE
LOG = logging.getLogger(__name__)
class NetworkActivator(ABC):
@staticmethod
@abstractmethod
def available() -> bool:
raise NotImplementedError()
@staticmethod
@abstractmethod
def bring_up_interface(device_name: str) -> bool:
raise NotImplementedError()
@classmethod
def bring_up_interfaces(cls, device_names: Iterable[str]) -> bool:
all_succeeded = True
for device in device_names:
if not cls.bring_up_interface(device):
all_succeeded = False
return all_succeeded
@classmethod
def bring_up_all_interfaces(cls, network_state: NetworkState) -> bool:
return cls.bring_up_interfaces(
[i['name'] for i in network_state.iter_interfaces()]
)
class IfUpDownActivator(NetworkActivator):
# Note that we're not overriding bring_up_interfaces to pass something
# like ifup --all because it isn't supported everywhere.
# E.g., NetworkManager has a ifupdown plugin that requires the name
# of a specific connection.
@staticmethod
def available(target=None) -> bool:
"""Return true if ifupdown can be used on this system."""
return eni_available(target=target)
@staticmethod
def bring_up_interface(device_name: str) -> bool:
"""Bring up interface using ifup."""
cmd = ['ifup', device_name]
LOG.debug("Attempting to run bring up interface %s using command %s",
device_name, cmd)
try:
(_out, err) = subp.subp(cmd)
if len(err):
LOG.warning("Running %s resulted in stderr output: %s",
cmd, err)
return True
except subp.ProcessExecutionError:
util.logexc(LOG, "Running interface command %s failed", cmd)
return False
class NetworkManagerActivator(NetworkActivator):
@staticmethod
def available(target=None) -> bool:
config_present = os.path.isfile(
subp.target_path(target, path=NM_CFG_FILE)
)
nmcli_present = subp.which('nmcli', target=target)
return config_present and bool(nmcli_present)
@staticmethod
def bring_up_interface(device_name: str) -> bool:
try:
subp.subp(['nmcli', 'connection', 'up', device_name])
except subp.ProcessExecutionError:
util.logexc(LOG, "nmcli failed to bring up {}".format(device_name))
return False
return True
class NetplanActivator(NetworkActivator):
@staticmethod
def available(target=None) -> bool:
return netplan_available(target=target)
@staticmethod
def _apply_netplan():
LOG.debug('Applying current netplan config')
try:
subp.subp(['netplan', 'apply'], capture=True)
except subp.ProcessExecutionError:
util.logexc(LOG, "netplan apply failed")
return False
return True
@staticmethod
def bring_up_interface(device_name: str) -> bool:
LOG.debug("Calling 'netplan apply' rather than "
"bringing up individual interfaces")
return NetplanActivator._apply_netplan()
@staticmethod
def bring_up_interfaces(device_names: Iterable[str]) -> bool:
LOG.debug("Calling 'netplan apply' rather than "
"bringing up individual interfaces")
return NetplanActivator._apply_netplan()
@staticmethod
def bring_up_all_interfaces(network_state: NetworkState) -> bool:
return NetplanActivator._apply_netplan()
# This section is mostly copied and pasted from renderers.py. An abstract
# version to encompass both seems overkill at this point
DEFAULT_PRIORITY = [
IfUpDownActivator,
NetworkManagerActivator,
NetplanActivator,
]
def search_activator(
priority=None, target=None
) -> List[Type[NetworkActivator]]:
if priority is None:
priority = DEFAULT_PRIORITY
unknown = [i for i in priority if i not in DEFAULT_PRIORITY]
if unknown:
raise ValueError(
"Unknown activators provided in priority list: %s" % unknown)
return [activator for activator in priority if activator.available(target)]
def select_activator(priority=None, target=None) -> Type[NetworkActivator]:
found = search_activator(priority, target)
if not found:
if priority is None:
priority = DEFAULT_PRIORITY
tmsg = ""
if target and target != "/":
tmsg = " in target=%s" % target
raise RuntimeError(
"No available network activators found%s. Searched "
"through list: %s" % (tmsg, priority))
return found[0]
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