Add some stuff

systems/lctr-a72xx/fs/etc/dhcp/dhclient-exit-hooks.d/hook-dhclient

@@ -0,0 +1,27 @@
+#!/bin/sh
+# This file is part of cloud-init. See LICENSE file for license information.
+
+# This script writes DHCP lease information into the cloud-init run directory
+# It is sourced, not executed.  For more information see dhclient-script(8).
+
+is_azure() {
+    local dmi_path="/sys/class/dmi/id/board_vendor" vendor=""
+    if [ -e "$dmi_path" ] && read vendor < "$dmi_path"; then
+        [ "$vendor" = "Microsoft Corporation" ] && return 0
+    fi
+    return 1
+}
+
+is_enabled() {
+    # only execute hooks if cloud-init is enabled and on azure
+    [ -e /run/cloud-init/enabled ] || return 1
+    is_azure
+}
+
+if is_enabled; then
+   case "$reason" in
+      BOUND) cloud-init dhclient-hook up "$interface";;
+      DOWN|RELEASE|REBOOT|STOP|EXPIRE)
+         cloud-init dhclient-hook down "$interface";;
+   esac
+fi