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# Copyright (C) 2015 Canonical Ltd.
#
# Author: Ryan Harper <[email protected]>
#
# This file is part of cloud-init. See LICENSE file for license information.
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, driver=None):
"""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"
"""
if not driver:
driver = '?*'
rule = ', '.join([
compose_udev_equality('SUBSYSTEM', 'net'),
compose_udev_equality('ACTION', 'add'),
compose_udev_equality('DRIVERS', driver),
compose_udev_attr_equality('address', mac),
compose_udev_setting('NAME', interface),
])
return '%s\n' % rule
# vi: ts=4 expandtab syntax=python