124 lines
4.0 KiB
Python
124 lines
4.0 KiB
Python
import copy
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import glob
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import fnmatch
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import os
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import logging
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import yaml
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log = logging.getLogger("subiquitycore.netplan")
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class Config:
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"""A NetplanConfig represents the network config for a system.
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Call parse_netplan_config() with each piece of yaml config, and then
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call config_for_device to get the config that matches a particular
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network devices, if any.
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"""
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def __init__(self):
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self.devices = []
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self.config = []
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def parse_netplan_config(self, config):
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try:
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self.config = config = yaml.safe_load(config)
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except yaml.ReaderError as e:
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log.info("could not parse config: %s", e)
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return
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network = config.get('network')
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if network is None:
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log.info("no 'network' key in config")
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return
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version = network.get("version")
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if version != 2:
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log.info("network has no/unexpected version %s", version)
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return
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for ethernet, eth_config in network.get('ethernets', {}).items():
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self.devices.append(_Device(ethernet, eth_config))
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for wifi, wifi_config in network.get('wifis', {}).items():
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self.devices.append(_Device(wifi, wifi_config))
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def config_for_device(self, link):
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allowed_matches = ('macaddress',)
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match_key = 'match'
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for dev in self.devices:
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if dev.matches_link(link):
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config = copy.deepcopy(dev.config)
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if match_key in config:
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match = {k: v for k, v in config[match_key].items()
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if k in allowed_matches}
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if match:
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config[match_key] = match
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else:
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del config[match_key]
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return config
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return {}
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def load_from_root(self, root):
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for path in configs_in_root(root):
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try:
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fp = open(path)
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except OSError:
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log.exception("opening %s failed", path)
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with fp:
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self.parse_netplan_config(fp.read())
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class _Device:
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def __init__(self, name, config):
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match = config.get('match')
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if match is None:
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self.match_name = name
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self.match_mac = None
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self.match_driver = None
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else:
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self.match_name = match.get('name')
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self.match_mac = match.get('macaddress')
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self.match_driver = match.get('driver')
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self.config = config
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log.info("config for %s = %s" % (name, self.config))
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def matches_link(self, link):
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if self.match_name is not None:
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matches_name = fnmatch.fnmatch(link.name, self.match_name)
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else:
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matches_name = True
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if self.match_mac is not None:
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matches_mac = self.match_mac == link.hwaddr
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else:
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matches_mac = True
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if self.match_driver is not None:
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matches_driver = self.match_driver == link.driver
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else:
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matches_driver = True
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return matches_name and matches_mac and matches_driver
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def configs_in_root(root, masked=False):
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"""Return a list of all netplan configs under root.
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The list is ordered in increasing precedence.
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@param masked: if True, include config paths that are masked
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by the same basename in a different directory."""
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if not os.path.isabs(root):
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root = os.path.abspath(root)
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wildcard = "*.yaml"
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dirs = {"lib": "0", "etc": "1", "run": "2"}
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rootlen = len(root)
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paths = []
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for d in dirs:
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paths.extend(glob.glob(os.path.join(root, d, "netplan", wildcard)))
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def mykey(path):
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"""returned key is basename + string-precidence based on dir."""
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bname = os.path.basename(path)
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bdir = path[rootlen + 1]
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bdir = bdir[:bdir.find(os.path.sep)]
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return "%s/%s" % (bname, bdir)
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if not masked:
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paths = {os.path.basename(p): p for p in paths}.values()
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return sorted(paths, key=mykey)
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