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#!/bin/sh -e
#
# This script is run if the interface (recognized by its MAC address) lacks
# a rule for persistent naming.
#
# If there is already a persistent rule with that interface name then the
# current interface needs to be renamed.
#
# If the interface needs to be renamed, a NAME=value pair will be printed
# on stdout to allow udev to IMPORT it. Then a rule for the MAC address and
# interface name is written.
#
# (C) 2006 Marco d'Itri <md@Linux.IT>
#
# 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 version 2 of the License.
RULES_FILE='/etc/udev/rules.d/70-persistent-net.rules'
. /lib/udev/rule_generator.functions
interface_name_taken() {
local value="$(find_all_rules 'NAME=' $INTERFACE)"
if [ "$value" ]; then
return 0
else
return 1
fi
}
find_next_available() {
raw_find_next_available "$(find_all_rules 'NAME=' "$1")"
}
write_rule() {
local match="$1"
local name="$2"
local comment="$3"
{
if [ "$PRINT_HEADER" ]; then
PRINT_HEADER=
echo "# This file was automatically generated by the $0"
echo "# program, probably run by the persistent-net-generator.rules rules file."
echo "#"
echo "# You can modify it, as long as you keep each rule on a single line."
fi
echo ""
[ "$comment" ] && echo "# $comment"
echo "SUBSYSTEM==\"net\", $match, NAME=\"$name\""
} >> $RULES_FILE
}
# used only if $RULES_FILE is empty, like on installation
if [ "$1" = "all_interfaces" ]; then
if [ -e $RULES_FILE ]; then
printf "$RULES_FILE exists, persistent interface names\nnot saved.\n" >&2
exit 0
fi
if [ ! -e /sys/class/net/ ]; then
echo "/sys/class/net/ is not available, persistent interface names not saved." >&2
exit 0
fi
cd /sys/class/net/ || return 0
for INTERFACE in *; do
case $INTERFACE in
eth*|ath*|wlan*|ra*|sta*) ;;
*) continue ;;
esac
INTERFACE="$INTERFACE" DEVPATH="/class/net/$INTERFACE" \
/lib/udev/write_net_rules || true
done
exit 0
fi
if [ -z "$INTERFACE" ]; then
echo "Missing \$INTERFACE." >&2
exit 1
fi
if [ "$1" ]; then
MAC_ADDR="$1"
else
MAC_ADDR=$(sysread address)
fi
if [ -z "$MAC_ADDR" ]; then
echo "No MAC address for $INTERFACE." >&2
exit 1
fi
if [ "$MAC_ADDR" = "00:00:00:00:00:00" ]; then
echo "NULL MAC address for $INTERFACE." >&2
exit 1
fi
# Prevent concurrent processes from modifying the file at the same time.
lock_rules_file
# Check if the rules file is writeable.
choose_rules_file
# If a rule using the current name already exists then find a new name and
# report it to udev which will rename the interface.
basename=${INTERFACE%%[0-9]*}
if interface_name_taken; then
INTERFACE="$basename$(find_next_available "$basename[0-9]*")"
if [ ! -t 1 ]; then
echo "INTERFACE_NEW=$INTERFACE"
fi
fi
# the DRIVERS key is needed to not match bridges and VLAN sub-interfaces
match="DRIVERS==\"?*\", ATTRS{address}==\"$MAC_ADDR\""
if [ $basename = "ath" -o $basename = "wlan" ]; then
match="$match, ATTRS{type}==\"1\"" # do not match the wifi* interfaces
fi
write_rule "$match" "$INTERFACE" "$COMMENT"
unlock_rules_file
exit 0
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