From bae8a20575d1d240b06a38bf0852d4ca747b9e2c Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Thu, 1 Feb 2024 10:16:57 +0100
Subject: [slx-uuid] Move network stuff down to fallback path, more output

---
 modules.d/slx-uuid/hooks/s3-get-system-uuid.sh | 51 ++++++++++++--------------
 1 file changed, 24 insertions(+), 27 deletions(-)

diff --git a/modules.d/slx-uuid/hooks/s3-get-system-uuid.sh b/modules.d/slx-uuid/hooks/s3-get-system-uuid.sh
index e97a0e18..3669ff4e 100755
--- a/modules.d/slx-uuid/hooks/s3-get-system-uuid.sh
+++ b/modules.d/slx-uuid/hooks/s3-get-system-uuid.sh
@@ -3,30 +3,9 @@
 # Slighty changed version of:
 # http://git.openslx.org/openslx-ng/mltk.git/plain/core/modules/system-uuid/data/bin/get-uuid
 
-if [ -e /run/openslx/network.conf ]; then
-	. /run/openslx/network.conf
-else
-	echo "Don't have /run/openslx/network.conf"
-fi
-
-if [ -z "$SLX_PXE_MAC" ]; then
-	echo "Getting MAC from /run/openslx/network.conf failed, using 'ip a'..."
-	for iface in "${SLX_BRIDGE:-br0}" boot0 eth0; do
-		BOOTIF=01-$(ip a | grep -A 1 ": ${iface}" | grep -o 'ether ..:..:..:..:..:..' | cut -d' ' -f2 | sed s/:/-/g)
-		[ "${#BOOTIF}" -eq "20" ] && break
-	done
-	if [ "${#BOOTIF}" -ne "20" ]; then
-		echo "Getting MAC from 'ip a' failed, using bogus value..."
-		BOOTIF="99-88-77-66-55-44-33"
-	fi
-else
-	BOOTIF="01-$( echo "$SLX_PXE_MAC" | tr ':' '-' )"
-fi
-
 UUID=$(dmidecode -q -s system-uuid | grep -v '^#' | head -n 1 | tr 'a-z' 'A-Z')
 if [ "${#UUID}" -ne "36" ]; then
-	echo "Determined UUID (${UUID}) has not expected length of 36, falling back to MAC..."
-	# Maybe use /proc/sys/kernel/random/uuid ?
+	echo "Determined UUID ${UUID} has not expected length of 36, falling back to MAC..."
 	UUID=
 else
 	# Got UUID, check blacklist
@@ -45,21 +24,39 @@ else
 	# Finally make unique
 	sort -u "$TMPLIST" > "$BADLIST"
 	if grep -Fxq "$UUID" "$BADLIST"; then
-		echo "WARNING: UUID is blacklisted as potentially not being unique, using MAC fallback"
+		echo "WARNING: UUID $UUID is blacklisted as potentially not being unique, using MAC fallback"
 		UUID=
 	fi
 	rm -f -- "$TMPLIST" "$BADLIST"
 fi
 
 if [ -z "$UUID" ]; then
-	UUID=$( echo "$BOOTIF" | sed -r 's/[^0-9A-Fa-f]//g' )
-	[ "${#UUID}" -eq 14 ] && UUID="${UUID:2}"
-	if [ "${#UUID}" -eq 12 ]; then
+	# No UUID, or was bogus - derive from bootif MAC address
+	if [ -e /run/openslx/network.conf ]; then
+		. /run/openslx/network.conf
+	else
+		echo "Don't have /run/openslx/network.conf"
+	fi
+
+	if [ "${#SLX_PXE_MAC}" != 17 ]; then
+		echo "Getting MAC from /run/openslx/network.conf failed, looking up in sysfs"
+		for iface in "${SLX_BRIDGE:-br0}" "${SLX_PXE_NETIF:-boot0}" eth0; do
+			SLX_PXE_MAC=$( cat "/sys/class/net/$iface/address" )
+			[ "${#SLX_PXE_MAC}" = "17" ] && break
+		done
+		if [ "${#SLX_PXE_MAC}" != "17" ]; then
+			echo "Getting MAC from sysfs failed, using bogus value..."
+			SLX_PXE_MAC="88:77:66:55:44:33"
+		fi
+	fi
+	UUID="$( echo "$SLX_PXE_MAC" | sed -r 's/[^0-9A-Fa-f]//g' )"
+	if [ "${#UUID}" = 12 ]; then
 		UUID="baad1d00-9491-4716-b98b-$UUID"
 	else
+		echo "Could not derive UUID from MAC (got '$UUID'), using bogus fallback"
 		UUID="baad1d00-9491-4716-b98b-000000000000"
 	fi
 fi
 UUID=$( echo "$UUID" | tr 'a-z' 'A-Z' )
-readonly UUID
+echo "Final UUID is $UUID"
 echo "$UUID" > "/run/system-uuid"
-- 
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