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- #!/bin/sh -e
- #
- # Copyright (C) 2006 Marco d'Itri <md@Linux.IT>
- # Copyright (C) 2007 Kay Sievers <kay.sievers@vrfy.org>
- #
- # 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.
- #
- # This script is run to create persistent network device naming rules
- # based on properties of the device.
- # If the interface needs to be renamed, INTERFACE_NEW=<name> will be printed
- # on stdout to allow udev to IMPORT it.
-
- # variables used to communicate:
- # MATCHADDR MAC address used for the match
- # MATCHID bus_id used for the match
- # MATCHDEVID dev_id used for the match
- # MATCHDRV driver name used for the match
- # MATCHIFTYPE interface type match
- # COMMENT comment to add to the generated rule
- # INTERFACE_NAME requested name supplied by external tool
- # INTERFACE_NEW new interface name returned by rule writer
-
- # debug, if UDEV_LOG=<debug>
- if [ -n "$UDEV_LOG" ]; then
- if [ "$UDEV_LOG" -ge 7 ]; then
- set -x
- fi
- fi
-
- 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 $0"
- echo "# program, run by the persistent-net-generator.rules rules file."
- echo "#"
- echo "# You can modify it, as long as you keep each rule on a single"
- echo "# line, and change only the value of the NAME= key."
- fi
-
- echo ""
- [ "$comment" ] && echo "# $comment"
- echo "SUBSYSTEM==\"net\", ACTION==\"add\"$match, NAME=\"$name\""
- } >> $RULES_FILE
- }
-
- if [ -z "$INTERFACE" ]; then
- echo "missing \$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
-
- # the DRIVERS key is needed to not match bridges and VLAN sub-interfaces
- if [ "$MATCHADDR" ]; then
- match="$match, DRIVERS==\"?*\", ATTR{address}==\"$MATCHADDR\""
- fi
-
- if [ "$MATCHDRV" ]; then
- match="$match, DRIVERS==\"$MATCHDRV\""
- fi
-
- if [ "$MATCHDEVID" ]; then
- match="$match, ATTR{dev_id}==\"$MATCHDEVID\""
- fi
-
- if [ "$MATCHID" ]; then
- match="$match, KERNELS==\"$MATCHID\""
- fi
-
- if [ "$MATCHIFTYPE" ]; then
- match="$match, ATTR{type}==\"$MATCHIFTYPE\""
- fi
-
- if [ -z "$match" ]; then
- echo "missing valid match" >&2
- unlock_rules_file
- exit 1
- fi
-
- basename=${INTERFACE%%[0-9]*}
- match="$match, KERNEL==\"$basename*\""
-
- if [ "$INTERFACE_NAME" ]; then
- # external tools may request a custom name
- COMMENT="$COMMENT (custom name provided by external tool)"
- if [ "$INTERFACE_NAME" != "$INTERFACE" ]; then
- INTERFACE=$INTERFACE_NAME;
- echo "INTERFACE_NEW=$INTERFACE"
- fi
- else
- # if a rule using the current name already exists, find a new name
- if interface_name_taken; then
- INTERFACE="$basename$(find_next_available "$basename[0-9]*")"
- echo "INTERFACE_NEW=$INTERFACE"
- fi
- fi
-
- write_rule "$match" "$INTERFACE" "$COMMENT"
-
- unlock_rules_file
-
- exit 0
-