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142 lines
3.8 KiB
Bash
142 lines
3.8 KiB
Bash
#!/bin/sh -e
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# This script is run to create persistent network device naming rules
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# based on properties of the device.
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# If the interface needs to be renamed, INTERFACE_NEW=<name> will be printed
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# on stdout to allow udev to IMPORT it.
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# variables used to communicate:
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# MATCHADDR MAC address used for the match
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# MATCHID bus_id used for the match
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# MATCHDEVID dev_id used for the match
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# MATCHDRV driver name used for the match
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# MATCHIFTYPE interface type match
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# COMMENT comment to add to the generated rule
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# INTERFACE_NAME requested name supplied by external tool
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# INTERFACE_NEW new interface name returned by rule writer
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# Copyright (C) 2006 Marco d'Itri <md@Linux.IT>
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# Copyright (C) 2007 Kay Sievers <kay.sievers@vrfy.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# debug, if UDEV_LOG=<debug>
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if [ -n "$UDEV_LOG" ]; then
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if [ "$UDEV_LOG" -ge 7 ]; then
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set -x
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fi
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fi
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RULES_FILE='/etc/udev/rules.d/70-persistent-net.rules'
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. /lib/udev/rule_generator.functions
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interface_name_taken() {
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local value="$(find_all_rules 'NAME=' $INTERFACE)"
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if [ "$value" ]; then
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return 0
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else
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return 1
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fi
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}
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find_next_available() {
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raw_find_next_available "$(find_all_rules 'NAME=' "$1")"
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}
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write_rule() {
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local match="$1"
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local name="$2"
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local comment="$3"
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{
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if [ "$PRINT_HEADER" ]; then
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PRINT_HEADER=
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echo "# This file was automatically generated by the $0"
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echo "# program, run by the persistent-net-generator.rules rules file."
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echo "#"
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echo "# You can modify it, as long as you keep each rule on a single"
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echo "# line, and change only the value of the NAME= key."
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fi
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echo ""
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[ "$comment" ] && echo "# $comment"
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echo "SUBSYSTEM==\"net\", ACTION==\"add\"$match, NAME=\"$name\""
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} >> $RULES_FILE
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}
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if [ -z "$INTERFACE" ]; then
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echo "missing \$INTERFACE" >&2
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exit 1
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fi
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# Prevent concurrent processes from modifying the file at the same time.
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lock_rules_file
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# Check if the rules file is writeable.
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choose_rules_file
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# the DRIVERS key is needed to not match bridges and VLAN sub-interfaces
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if [ "$MATCHADDR" ]; then
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match="$match, DRIVERS==\"?*\", ATTR{address}==\"$MATCHADDR\""
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fi
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if [ "$MATCHDRV" ]; then
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match="$match, DRIVERS==\"$MATCHDRV\""
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fi
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if [ "$MATCHDEVID" ]; then
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match="$match, ATTR{dev_id}==\"$MATCHDEVID\""
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fi
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if [ "$MATCHID" ]; then
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match="$match, KERNELS==\"$MATCHID\""
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fi
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if [ "$MATCHIFTYPE" ]; then
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match="$match, ATTR{type}==\"$MATCHIFTYPE\""
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fi
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if [ -z "$match" ]; then
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echo "missing valid match" >&2
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unlock_rules_file
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exit 1
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fi
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basename=${INTERFACE%%[0-9]*}
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match="$match, KERNEL==\"$basename*\""
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if [ "$INTERFACE_NAME" ]; then
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# external tools may request a custom name
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COMMENT="$COMMENT (custom name provided by external tool)"
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if [ "$INTERFACE_NAME" != "$INTERFACE" ]; then
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INTERFACE=$INTERFACE_NAME;
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echo "INTERFACE_NEW=$INTERFACE"
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fi
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else
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# if a rule using the current name already exists, find a new name
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if interface_name_taken; then
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INTERFACE="$basename$(find_next_available "$basename[0-9]*")"
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# prevent INTERFACE from being "eth" instead of "eth0"
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[ "$INTERFACE" = "${INTERFACE%%[ \[\]0-9]*}" ] && INTERFACE=${INTERFACE}0
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echo "INTERFACE_NEW=$INTERFACE"
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fi
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fi
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write_rule "$match" "$INTERFACE" "$COMMENT"
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unlock_rules_file
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exit 0
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