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apply.py
#!/usr/bin/python3 # # Copyright (C) 2018-2020 Canonical, Ltd. # Author: Mathieu Trudel-Lapierre <mathieu.trudel-lapierre@canonical.com> # Author: Łukasz 'sil2100' Zemczak <lukasz.zemczak@canonical.com> # Author: Lukas 'slyon' Märdian <lukas.maerdian@canonical.com> # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; version 3. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. '''netplan apply command line''' import logging import os import sys import glob import subprocess import shutil import netifaces import time from .. import utils from ...configmanager import ConfigManager, ConfigurationError from ..sriov import apply_sriov_config from ..ovs import OvsDbServerNotRunning, OvsDbServerNotInstalled, apply_ovs_cleanup OVS_CLEANUP_SERVICE = 'netplan-ovs-cleanup.service' IF_NAMESIZE = 16 class NetplanApply(utils.NetplanCommand): def __init__(self): super().__init__(command_id='apply', description='Apply current netplan config to running system', leaf=True) self.sriov_only = False self.only_ovs_cleanup = False self.state = None # to be filled by the '--state' argument def run(self): # pragma: nocover (covered in autopkgtest) self.parser.add_argument('--sriov-only', action='store_true', help='Only apply SR-IOV related configuration and exit') self.parser.add_argument('--only-ovs-cleanup', action='store_true', help='Only clean up old OpenVSwitch interfaces and exit') self.parser.add_argument('--state', help='Directory containing previous YAML configuration') self.func = self.command_apply self.parse_args() self.run_command() def command_apply(self, run_generate=True, sync=False, exit_on_error=True, state_dir=None): # pragma: nocover config_manager = ConfigManager() if state_dir: self.state = state_dir # For certain use-cases, we might want to only apply specific configuration. # If we only need SR-IOV configuration, do that and exit early. if self.sriov_only: NetplanApply.process_sriov_config(config_manager, exit_on_error) return # If we only need OpenVSwitch cleanup, do that and exit early. elif self.only_ovs_cleanup: NetplanApply.process_ovs_cleanup(config_manager, False, False, exit_on_error) return # if we are inside a snap, then call dbus to run netplan apply instead if "SNAP" in os.environ: # TODO: maybe check if we are inside a classic snap and don't do # this if we are in a classic snap? busctl = shutil.which("busctl") if busctl is None: raise RuntimeError("missing busctl utility") # XXX: DO NOT TOUCH or change this API call, it is used by snapd to communicate # using core20 netplan binary/client/CLI on core18 base systems. Any change # must be agreed upon with the snapd team, so we don't break support for # base systems running older netplan versions. # https://github.com/snapcore/snapd/pull/5915 res = subprocess.call([busctl, "call", "--quiet", "--system", "io.netplan.Netplan", # the service "/io/netplan/Netplan", # the object "io.netplan.Netplan", # the interface "Apply", # the method ]) if res != 0: if exit_on_error: sys.exit(res) elif res == 130: raise PermissionError( "failed to communicate with dbus service") else: raise RuntimeError( "failed to communicate with dbus service: error %s" % res) else: return ovs_cleanup_service = '/run/systemd/system/netplan-ovs-cleanup.service' old_files_networkd = bool(glob.glob('/run/systemd/network/*netplan-*')) old_ovs_glob = glob.glob('/run/systemd/system/netplan-ovs-*') # Ignore netplan-ovs-cleanup.service, as it can always be there if ovs_cleanup_service in old_ovs_glob: old_ovs_glob.remove(ovs_cleanup_service) old_files_ovs = bool(old_ovs_glob) old_nm_glob = glob.glob('/run/NetworkManager/system-connections/netplan-*') nm_ifaces = utils.nm_interfaces(old_nm_glob, netifaces.interfaces()) old_files_nm = bool(old_nm_glob) generator_call = [] generate_out = None if 'NETPLAN_PROFILE' in os.environ: generator_call.extend(['valgrind', '--leak-check=full']) generate_out = subprocess.STDOUT generator_call.append(utils.get_generator_path()) if run_generate and subprocess.call(generator_call, stderr=generate_out) != 0: if exit_on_error: sys.exit(os.EX_CONFIG) else: raise ConfigurationError("the configuration could not be generated") devices = netifaces.interfaces() # Re-start service when # 1. We have configuration files for it # 2. Previously we had config files for it but not anymore # Ideally we should compare the content of the *netplan-* files before and # after generation to minimize the number of re-starts, but the conditions # above works too. restart_networkd = bool(glob.glob('/run/systemd/network/*netplan-*')) if not restart_networkd and old_files_networkd: restart_networkd = True restart_ovs_glob = glob.glob('/run/systemd/system/netplan-ovs-*') # Ignore netplan-ovs-cleanup.service, as it can always be there if ovs_cleanup_service in restart_ovs_glob: restart_ovs_glob.remove(ovs_cleanup_service) restart_ovs = bool(restart_ovs_glob) if not restart_ovs and old_files_ovs: # OVS is managed via systemd units restart_networkd = True restart_nm_glob = glob.glob('/run/NetworkManager/system-connections/netplan-*') nm_ifaces.update(utils.nm_interfaces(restart_nm_glob, devices)) restart_nm = bool(restart_nm_glob) if not restart_nm and old_files_nm: restart_nm = True # Running 'systemctl daemon-reload' will re-run the netplan systemd generator, # so let's make sure we only run it iff we're willing to run 'netplan generate' if run_generate: utils.systemctl_daemon_reload() # stop backends if restart_networkd: logging.debug('netplan generated networkd configuration changed, reloading networkd') # Clean up any old netplan related OVS ports/bonds/bridges, if applicable NetplanApply.process_ovs_cleanup(config_manager, old_files_ovs, restart_ovs, exit_on_error) wpa_services = ['netplan-wpa-*.service'] # Historically (up to v0.98) we had netplan-wpa@*.service files, in case of an # upgraded system, we need to make sure to stop those. if utils.systemctl_is_active('netplan-wpa@*.service'): wpa_services.insert(0, 'netplan-wpa@*.service') utils.systemctl('stop', wpa_services, sync=sync) else: logging.debug('no netplan generated networkd configuration exists') loopback_connection = '' if restart_nm: logging.debug('netplan generated NM configuration changed, restarting NM') if utils.nm_running(): if 'lo' in nm_ifaces: loopback_connection = utils.nm_get_connection_for_interface('lo') # restarting NM does not cause new config to be applied, need to shut down devices first for device in devices: if device not in nm_ifaces: continue # do not touch this interface # ignore failures here -- some/many devices might not be managed by NM try: utils.nmcli(['device', 'disconnect', device]) except subprocess.CalledProcessError: pass utils.systemctl_network_manager('stop', sync=sync) else: logging.debug('no netplan generated NM configuration exists') # Refresh devices now; restarting a backend might have made something appear. devices = netifaces.interfaces() # evaluate config for extra steps we need to take (like renaming) # for now, only applies to non-virtual (real) devices. config_manager.parse() changes = NetplanApply.process_link_changes(devices, config_manager) # delete virtual interfaces that have been defined in a previous state # but are not configured anymore in the current YAML if self.state: cm = ConfigManager(self.state) cm.parse() # get previous configuration state prev_links = cm.virtual_interfaces.keys() curr_links = config_manager.virtual_interfaces.keys() NetplanApply.clear_virtual_links(prev_links, curr_links, devices) # if the interface is up, we can still apply some .link file changes # but we cannot apply the interface rename via udev, as it won't touch # the interface name, if it was already renamed once (e.g. during boot), # because of the NamePolicy=keep default: # https://www.freedesktop.org/software/systemd/man/systemd.net-naming-scheme.html devices = netifaces.interfaces() for device in devices: logging.debug('netplan triggering .link rules for %s', device) try: subprocess.check_call(['udevadm', 'test-builtin', 'net_setup_link', '/sys/class/net/' + device], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) subprocess.check_call(['udevadm', 'test', '/sys/class/net/' + device], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) except subprocess.CalledProcessError: logging.debug('Ignoring device without syspath: %s', device) devices_after_udev = netifaces.interfaces() # apply some more changes manually for iface, settings in changes.items(): # rename non-critical network interfaces new_name = settings.get('name') if new_name: if len(new_name) >= IF_NAMESIZE: logging.warning('Interface name {} is too long. {} will not be renamed'.format(new_name, iface)) continue if iface in devices and new_name in devices_after_udev: logging.debug('Interface rename {} -> {} already happened.'.format(iface, new_name)) continue # re-name already happened via 'udevadm test' # bring down the interface, using its current (matched) interface name subprocess.check_call(['ip', 'link', 'set', 'dev', iface, 'down'], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) # rename the interface to the name given via 'set-name' subprocess.check_call(['ip', 'link', 'set', 'dev', iface, 'name', settings.get('name')], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) # Reloading of udev rules happens during 'netplan generate' already # subprocess.check_call(['udevadm', 'control', '--reload-rules']) subprocess.check_call(['udevadm', 'trigger', '--attr-match=subsystem=net']) subprocess.check_call(['udevadm', 'settle']) # apply any SR-IOV related changes, if applicable NetplanApply.process_sriov_config(config_manager, exit_on_error) # (re)set global regulatory domain if os.path.exists('/run/systemd/system/netplan-regdom.service'): utils.systemctl('start', ['netplan-regdom.service']) # (re)start backends if restart_networkd: netplan_wpa = [os.path.basename(f) for f in glob.glob('/run/systemd/system/*.wants/netplan-wpa-*.service')] # exclude the special 'netplan-ovs-cleanup.service' unit netplan_ovs = [os.path.basename(f) for f in glob.glob('/run/systemd/system/*.wants/netplan-ovs-*.service') if not f.endswith('/' + OVS_CLEANUP_SERVICE)] # Run 'systemctl start' command synchronously, to avoid race conditions # with 'oneshot' systemd service units, e.g. netplan-ovs-*.service. try: utils.networkctl_reload() utils.networkctl_reconfigure(utils.networkd_interfaces()) except subprocess.CalledProcessError: # (re-)start systemd-networkd if it is not running, yet logging.warning('Falling back to a hard restart of systemd-networkd.service') utils.systemctl('restart', ['systemd-networkd.service'], sync=True) # 1st: execute OVS cleanup, to avoid races while applying OVS config utils.systemctl('start', [OVS_CLEANUP_SERVICE], sync=True) # 2nd: start all other services utils.systemctl('start', netplan_wpa + netplan_ovs, sync=True) if restart_nm: # Flush all IP addresses of NM managed interfaces, to avoid NM creating # new, non netplan-* connection profiles, using the existing IPs. nm_interfaces = utils.nm_interfaces(restart_nm_glob, devices) for iface in nm_interfaces: utils.ip_addr_flush(iface) # clear NM state, especially the [device].managed=true config, as that might have been # re-set via an udev rule setting "NM_UNMANAGED=1" shutil.rmtree('/run/NetworkManager/devices', ignore_errors=True) utils.systemctl_network_manager('start', sync=sync) # If 'lo' is in the nm_interfaces set we flushed it's IPs (see above) and disconnected it. # NM will not bring it back automatically after restarting and we need to do that manually. # For that, we need NM up and ready to accept commands if 'lo' in nm_interfaces: sync = True if sync: # 'nmcli' could be /usr/bin/nmcli or # /snap/bin/nmcli -> /snap/bin/network-manager.nmcli cmd = ['nmcli', 'general', 'status'] # wait a bit for 'connected (site/local-only)' or # 'connected' to appear in 'nmcli general' STATE for _ in range(10): out = subprocess.run(cmd, capture_output=True, text=True) # Handle nmcli's "not running" return code (8) gracefully, # giving some more time for NetworkManager startup if out.returncode == 8: time.sleep(1) continue if '\nconnected' in str(out.stdout): break time.sleep(0.5) # If "lo" is managed by NM through Netplan, apply will flush its addresses and disconnect it. # NM will not bring it back automatically. # This is a possible scenario with netplan-everywhere. If a user tries to change the 'lo' # connection with nmcli for example, NM will create a persistent nmconnection file and emit a YAML for it. if 'lo' in nm_interfaces and loopback_connection: utils.nm_bring_interface_up(loopback_connection) @staticmethod def is_composite_member(composites, phy): """ Is this physical interface a member of a 'composite' virtual interface? (bond, bridge) """ for composite in composites: for _, settings in composite.items(): if not type(settings) is dict: continue members = settings.get('interfaces', []) for iface in members: if iface == phy: return True return False @staticmethod def clear_virtual_links(prev_links, curr_links, devices=[]): """ Calculate the delta of virtual links. And remove the links that were dropped from the YAML config, if they were not dropped by the backend already. We can make use of the netplan netdef ids, as those equal the interface name for virtual links. """ if not devices: logging.warning('Cannot clear virtual links: no network interfaces provided.') return [] dropped_interfaces = list(set(prev_links) - set(curr_links)) # some interfaces might have been cleaned up already, e.g. by the # NetworkManager backend interfaces_to_clear = list(set(dropped_interfaces).intersection(devices)) for link in interfaces_to_clear: try: cmd = ['ip', 'link', 'delete', 'dev', link] subprocess.check_call(cmd) except subprocess.CalledProcessError: logging.warning('Could not delete interface {}'.format(link)) return dropped_interfaces @staticmethod def process_link_changes(interfaces, config_manager: ConfigManager): # pragma: nocover (covered in autopkgtest) """ Go through the pending changes and pick what needs special handling. Only applies to non-critical interfaces which can be safely updated. """ changes = {} composite_interfaces = [config_manager.bridges, config_manager.bonds] # Find physical interfaces which need a rename # But do not rename virtual interfaces for netdef in config_manager.physical_interfaces.values(): newname = netdef.set_name if not newname: continue # Skip if no new name needs to be set if not netdef._has_match: continue # Skip if no match for current name is given if NetplanApply.is_composite_member(composite_interfaces, netdef.id): logging.debug('Skipping composite member {}'.format(netdef.id)) # do not rename members of virtual devices. MAC addresses # may be the same for all interface members. continue # Find current name of the interface, according to match conditions and globs (name, mac, driver) current_iface_name = utils.find_matching_iface(interfaces, netdef) if not current_iface_name: logging.warning('Cannot find unique matching interface for {}'.format(netdef.id)) continue if current_iface_name == newname: # Skip interface if it already has the correct name logging.debug('Skipping correctly named interface: {}'.format(newname)) continue if netdef.critical: # Skip interfaces defined as critical, as we should not take them down in order to rename logging.warning('Cannot rename {} ({} -> {}) at runtime (needs reboot), due to being critical' .format(netdef.id, current_iface_name, newname)) continue # record the interface rename change changes[current_iface_name] = {'name': newname} logging.debug('Link changes: {}'.format(changes)) return changes @staticmethod def process_sriov_config(config_manager, exit_on_error=True): # pragma: nocover (covered in autopkgtest) try: apply_sriov_config(config_manager) except utils.config_errors as e: logging.error(str(e)) if exit_on_error: sys.exit(1) @staticmethod def process_ovs_cleanup(config_manager, ovs_old, ovs_current, exit_on_error=True): # pragma: nocover (autopkgtest) try: apply_ovs_cleanup(config_manager, ovs_old, ovs_current) except (OSError, RuntimeError) as e: logging.error(str(e)) if exit_on_error: sys.exit(1) except OvsDbServerNotRunning as e: logging.warning('Cannot call Open vSwitch: {}.'.format(e)) except OvsDbServerNotInstalled as e: logging.debug('Cannot call Open vSwitch: %s.', e)
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