From dffbbe56d3f9f17da0244f75b352b87bc0e244df Mon Sep 17 00:00:00 2001
From: davidovski <david@davidovski.xyz>
Date: Mon, 14 Mar 2022 00:14:26 +0000
Subject: added udev

---
 udev/write_net_rules | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100755 udev/write_net_rules

(limited to 'udev/write_net_rules')

diff --git a/udev/write_net_rules b/udev/write_net_rules
new file mode 100755
index 0000000..f7c7761
--- /dev/null
+++ b/udev/write_net_rules
@@ -0,0 +1,140 @@
+#!/bin/sh -e
+
+# 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
+
+# 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, 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/>.
+
+# 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=${INTERFACE%%[0-9]*}
+
+if [ "$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]*")"
+                # prevent INTERFACE from being "eth" instead of "eth0"
+                [ "$INTERFACE" = "${INTERFACE%%[ \[\]0-9]*}" ] && INTERFACE=${INTERFACE}0
+                echo "INTERFACE_NEW=$INTERFACE"
+        fi
+fi
+
+write_rule "$match" "$INTERFACE" "$COMMENT"
+
+unlock_rules_file
+
+exit 0
-- 
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