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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2026-07-12 06:55
__init__.py	41.83 KB	-rw-r--r--	2022-11-23 21:17
activators.py	9.8 KB	-rw-r--r--	2022-11-23 21:17
bsd.py	6.86 KB	-rw-r--r--	2022-11-23 21:17
cmdline.py	9.05 KB	-rw-r--r--	2022-11-23 21:17
dhcp.py	11.61 KB	-rw-r--r--	2022-11-23 21:17
eni.py	21.56 KB	-rw-r--r--	2022-11-23 21:17
ephemeral.py	14.47 KB	-rw-r--r--	2022-11-23 21:17
freebsd.py	2.54 KB	-rw-r--r--	2022-11-23 21:17
netbsd.py	1.43 KB	-rw-r--r--	2022-11-23 21:17
netplan.py	17.35 KB	-rw-r--r--	2022-11-23 21:17
network_manager.py	13.06 KB	-rw-r--r--	2022-11-23 21:17
network_state.py	35.5 KB	-rw-r--r--	2022-11-23 21:17
networkd.py	12.63 KB	-rw-r--r--	2026-06-01 19:13
openbsd.py	2.2 KB	-rw-r--r--	2022-11-23 21:17
renderer.py	2.08 KB	-rw-r--r--	2022-11-23 21:17
renderers.py	1.8 KB	-rw-r--r--	2022-11-23 21:17
sysconfig.py	40.01 KB	-rw-r--r--	2022-11-23 21:17
udev.py	1.42 KB	-rw-r--r--	2022-11-23 21:17

Rename

# Copyright (C) 2015 Canonical Ltd.
#
# Author: Ryan Harper <ryan.harper@canonical.com>
#
# 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