Generate udev rules for persistent interface names by bus path, not mac address

generate-persistent-net-rules.sh

#!/bin/sh -e

# Copyright (C) 2006 Marco d'Itri <[email protected]>
# Copyright (C) 2007 Kay Sievers <[email protected]>
# Copyright (C) 2018 David R. Bild <[email protected]>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

RULES_FILE='50-custom-persistent-net.rules'

if [ "$1" ]; then
    RULES_FILE=$1
fi

write_header() {
    {
        echo "# This file was automatically generated by the $0"
        echo "# program."
        echo ""
    } > $RULES_FILE
}

write_rule() {
    local subsystem="$SUBSYSTEM"
    local path="${ID_PATH#pci-}"
    local interface="$INTERFACE"
    local subclass_name="$ID_PCI_SUBCLASS_FROM_DATABASE"
    local vendor_id="$ID_VENDOR_ID"
    local vendor_name="$ID_VENDOR_FROM_DATABASE"
    local device_id="$ID_MODEL_ID"
    local device_name="$ID_MODEL_FROM_DATABASE"
    
    {
        echo "# $path $subclass_name: $vendor_name $device_name was $interface"
        echo "SUBSYSTEM==\"$subsystem\", ACTION==\"add\", KERNELS==\"$path\", ATTRS{vendor}==\"$vendor_id\", ATTRS{device}==\"$device_id\", NAME:=\"$interface\""
        echo ""
    } >> $RULES_FILE

}

load_properties()
{
    local device_path=$1
    eval $(udevadm info -p $device_path -q property --export)
}

find_pci_net_devices() {
    find /sys/devices -type d -wholename '/sys/devices/pci*/net' -print
}

write_header

for device in $(find_pci_net_devices); do
    $(load_properties "$device/*" && write_rule)
done