golden hour

/lib/python3.9/site-packages/cloudinit/net

File/Folder	Size	Actions
__init__.py	41.92 KB
__pycache__	-
activators.py	11.72 KB
bsd.py	8.46 KB
cmdline.py	9.13 KB
dhcp.py	35.96 KB
eni.py	20.88 KB
ephemeral.py	21.5 KB
freebsd.py	3.69 KB
netbsd.py	1.41 KB
netops	-
netplan.py	20.69 KB
network_manager.py	24.66 KB
network_state.py	35.6 KB
networkd.py	12.75 KB
openbsd.py	2.48 KB
renderer.py	1.64 KB
renderers.py	1.78 KB
sysconfig.py	44.75 KB
udev.py	1.39 KB

Edit: udev.py

# 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