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utils.py
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# 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/>. import sys import os import logging import argparse import subprocess import netifaces import fnmatch import re NM_SERVICE_NAME = 'NetworkManager.service' NM_SNAP_SERVICE_NAME = 'snap.network-manager.networkmanager.service' def get_generator_path(): return os.environ.get('NETPLAN_GENERATE_PATH', '/lib/netplan/generate') def is_nm_snap_enabled(): return subprocess.call(['systemctl', '--quiet', 'is-enabled', NM_SNAP_SERVICE_NAME], stderr=subprocess.DEVNULL) == 0 def nmcli(args): # pragma: nocover (covered in autopkgtest) # 'nmcli' could be /usr/bin/nmcli or /snap/bin/nmcli -> /snap/bin/network-manager.nmcli # PATH is defined in cli/core.py subprocess.check_call(['nmcli'] + args, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) def nmcli_out(args: list) -> str: # pragma: nocover (covered in autopkgtest) # 'nmcli' could be /usr/bin/nmcli or /snap/bin/nmcli -> /snap/bin/network-manager.nmcli # PATH is defined in cli/core.py return subprocess.check_output(['nmcli'] + args, universal_newlines=True) def nm_running(): # pragma: nocover (covered in autopkgtest) '''Check if NetworkManager is running''' try: nmcli(['general']) return True except (OSError, subprocess.SubprocessError): return False def nm_interfaces(paths, devices): pat = re.compile('^interface-name=(.*)$') interfaces = set() for path in paths: with open(path, 'r') as f: for line in f: m = pat.match(line) if m: # Expand/match globbing of interface names, to real devices interfaces.update(set(fnmatch.filter(devices, m.group(1)))) break # skip to next file return interfaces def systemctl_network_manager(action, sync=False): # If the network-manager snap is installed use its service # name rather than the one of the deb packaged NetworkManager if is_nm_snap_enabled(): return systemctl(action, [NM_SNAP_SERVICE_NAME], sync) return systemctl(action, [NM_SERVICE_NAME], sync) # pragma: nocover (covered in autopkgtest) def systemctl(action, services, sync=False): if len(services) >= 1: command = ['systemctl', action] if not sync: command.append('--no-block') command.extend(services) subprocess.check_call(command) def networkd_interfaces(): interfaces = set() out = subprocess.check_output(['networkctl', '--no-pager', '--no-legend'], universal_newlines=True) for line in out.splitlines(): s = line.strip().split(' ') if s[0].isnumeric() and s[-1] not in ['unmanaged', 'linger']: interfaces.add(s[0]) return interfaces def networkctl_reload(): subprocess.check_call(['networkctl', 'reload']) def networkctl_reconfigure(interfaces): if len(interfaces) >= 1: subprocess.check_call(['networkctl', 'reconfigure'] + list(interfaces)) def systemctl_is_active(unit_pattern): '''Return True if at least one matching unit is running''' if subprocess.call(['systemctl', '--quiet', 'is-active', unit_pattern]) == 0: return True return False def systemctl_daemon_reload(): '''Reload systemd unit files from disk and re-calculate its dependencies''' subprocess.check_call(['systemctl', 'daemon-reload']) def ip_addr_flush(iface): '''Flush all IP addresses of a given interface via iproute2''' subprocess.check_call(['ip', 'addr', 'flush', iface], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) def get_interface_driver_name(interface, only_down=False): # pragma: nocover (covered in autopkgtest) devdir = os.path.join('/sys/class/net', interface) if only_down: try: with open(os.path.join(devdir, 'operstate')) as f: state = f.read().strip() if state != 'down': logging.debug('device %s operstate is %s, not changing', interface, state) return None except IOError as e: logging.error('Cannot determine operstate of %s: %s', interface, str(e)) return None try: driver = os.path.realpath(os.path.join(devdir, 'device', 'driver')) driver_name = os.path.basename(driver) except IOError as e: logging.debug('Cannot replug %s: cannot read link %s/device: %s', interface, devdir, str(e)) return None return driver_name def get_interface_macaddress(interface): # return an empty list (and string) if no LL data can be found link = netifaces.ifaddresses(interface).get(netifaces.AF_LINK, [{}])[0] return link.get('addr', '') def is_interface_matching_name(interface, match_name): # globs are supported return fnmatch.fnmatchcase(interface, match_name) def is_interface_matching_driver_name(interface, match_driver): driver_globs = match_driver if isinstance(driver_globs, str): driver_globs = [match_driver] driver_name = get_interface_driver_name(interface) # globs are supported return any( fnmatch.fnmatchcase(driver_name, pattern) for pattern in driver_globs ) def is_interface_matching_macaddress(interface, match_mac): macaddress = get_interface_macaddress(interface) # exact, case insensitive match. globs are not supported return match_mac.lower() == macaddress.lower() def find_matching_iface(interfaces, match): assert isinstance(match, dict) # Filter for match.name glob, fallback to '*' name_glob = match.get('name') if match.get('name', False) else '*' matches = fnmatch.filter(interfaces, name_glob) # Filter for match.macaddress (exact match) if len(matches) > 1 and match.get('macaddress'): matches = list(filter(lambda iface: is_interface_matching_macaddress(iface, match.get('macaddress')), matches)) # Filter for match.driver glob if len(matches) > 1 and match.get('driver'): matches = list(filter(lambda iface: is_interface_matching_driver_name(iface, match.get('driver')), matches)) # Return current name of unique matched interface, if available if len(matches) != 1: logging.info(matches) return None return matches[0] class NetplanCommand(argparse.Namespace): def __init__(self, command_id, description, leaf=True, testing=False): self.command_id = command_id self.description = description self.leaf_command = leaf self.testing = testing self._args = None self.debug = False self.commandclass = None self.subcommands = {} self.subcommand = None self.func = None self.parser = argparse.ArgumentParser(prog="%s %s" % (sys.argv[0], command_id), description=description, add_help=True) self.parser.add_argument('--debug', action='store_true', help='Enable debug messages') if not leaf: self.subparsers = self.parser.add_subparsers(title='Available commands', metavar='', dest='subcommand') p_help = self.subparsers.add_parser('help', description='Show this help message', help='Show this help message') p_help.set_defaults(func=self.print_usage) def update(self, args): self._args = args def parse_args(self): ns, self._args = self.parser.parse_known_args(args=self._args, namespace=self) if not self.subcommand and not self.leaf_command: print('You need to specify a command', file=sys.stderr) self.print_usage() def run_command(self): if self.commandclass: self.commandclass.update(self._args) # TODO: (cyphermox) this is actually testable in tests/cli.py; add it. if self.leaf_command and 'help' in self._args: # pragma: nocover (covered in autopkgtest) self.print_usage() self.func() def print_usage(self): self.parser.print_help(file=sys.stderr) sys.exit(os.EX_USAGE) def _add_subparser_from_class(self, name, commandclass): instance = commandclass() self.subcommands[name] = {} self.subcommands[name]['class'] = name self.subcommands[name]['instance'] = instance if instance.testing: if not os.environ.get('ENABLE_TEST_COMMANDS', None): return p = self.subparsers.add_parser(instance.command_id, description=instance.description, help=instance.description, add_help=False) p.set_defaults(func=instance.run, commandclass=instance) self.subcommands[name]['parser'] = p def _import_subcommands(self, submodules): import inspect for name, obj in inspect.getmembers(submodules): if inspect.isclass(obj) and issubclass(obj, NetplanCommand): self._add_subparser_from_class(name, obj)