From 224941480bb5e41ee6b43e3bf0f357568f18d44f Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Sun, 24 Oct 2021 21:20:44 +0200
Subject: vyos-router: dhcpv6: T3885: add alternative UUID source

Not all boards/devices ship the /sys/class/dmi/id/product_uuid file, thus a
fallback is used (e.g. on PCEngines APU4 board) which feeds the device specific
UUID from /sys/class/dmi/id/product_serial
---
 scripts/init/vyos-router | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'scripts')

diff --git a/scripts/init/vyos-router b/scripts/init/vyos-router
index bc0517c..c6d84a6 100755
--- a/scripts/init/vyos-router
+++ b/scripts/init/vyos-router
@@ -231,12 +231,16 @@ gen_duid ()
 {
     DUID_FILE="/var/lib/dhcpv6/dhcp6c_duid"
     UUID_FILE="/sys/class/dmi/id/product_uuid"
-    if [ ! -f ${UUID_FILE} ]; then
+    UUID_FILE_ALT="/sys/class/dmi/id/product_serial"
+    if [ ! -f ${UUID_FILE} ] && [ ! -f ${UUID_FILE_ALT} ]; then
         return 1
     fi
 
     # DUID is based on the BIOS/EFI UUID. We omit additional - characters
     UUID=$(cat ${UUID_FILE} | tr -d -)
+    if [ -z ${UUID} ]; then
+        UUID=$(uuidgen --sha1 --namespace @dns --name $(cat ${UUID_FILE_ALT}) | tr -d -)
+    fi
     # Add DUID type4 (UUID) information
     DUID_TYPE="0004"
 
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