/usr/lib/python2.7/dist-packages/curtin/udev.py is in python-curtin 18.1-5-g572ae5d6-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | # This file is part of curtin. See LICENSE file for copyright and license info.
import os
from curtin import util
def compose_udev_equality(key, value):
"""Return a udev comparison clause, like `ACTION=="add"`."""
assert key == key.upper()
return '%s=="%s"' % (key, value)
def compose_udev_attr_equality(attribute, value):
"""Return a udev attribute comparison clause, like `ATTR{type}=="1"`."""
assert attribute == attribute.lower()
return 'ATTR{%s}=="%s"' % (attribute, value)
def compose_udev_setting(key, value):
"""Return a udev assignment clause, like `NAME="eth0"`."""
assert key == key.upper()
return '%s="%s"' % (key, value)
def generate_udev_rule(interface, mac):
"""Return a udev rule to set the name of network interface with `mac`.
The rule ends up as a single line looking something like:
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
ATTR{address}="ff:ee:dd:cc:bb:aa", NAME="eth0"
"""
rule = ', '.join([
compose_udev_equality('SUBSYSTEM', 'net'),
compose_udev_equality('ACTION', 'add'),
compose_udev_equality('DRIVERS', '?*'),
compose_udev_attr_equality('address', mac),
compose_udev_setting('NAME', interface),
])
return '%s\n' % rule
def udevadm_settle(exists=None, timeout=None):
settle_cmd = ["udevadm", "settle"]
if exists:
# skip the settle if the requested path already exists
if os.path.exists(exists):
return
settle_cmd.extend(['--exit-if-exists=%s' % exists])
if timeout:
settle_cmd.extend(['--timeout=%s' % timeout])
util.subp(settle_cmd)
def udevadm_trigger(devices):
if devices is None:
devices = []
util.subp(['udevadm', 'trigger'] + list(devices))
udevadm_settle()
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