1 files changed, 71 insertions, 0 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
new file mode 100755
index 00000000..e65a3394
--- /dev/null
+++ b/modules.d/slx-uuid/hooks/s3-get-system-uuid.sh
@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+#
+# Slighty changed version of:
+# http://git.openslx.org/openslx-ng/mltk.git/plain/core/modules/system-uuid/data/bin/get-uuid
+
+. /lib/dracut-lib.sh
+
+get_system_uuid() {
+	if [ -e /run/openslx/network.conf ]; then
+		. /run/openslx/network.conf
+	else
+		echo "Don't have /run/openslx/network.conf"
+	fi
+
+	if [ -z "$SLX_PXE_MAC" ]; then
+		warn "Getting MAC from /run/openslx/network.conf failed, using 'ip a'..."
+		for iface in "${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 [ "${#BOOTIF}" -ne "20" ]; then
+			warn "Getting MAC from 'ip a' failed, using bogus value..."
+			BOOTIF="99-88-77-66-55-44-33"
+		fi
+	else
+		BOOTIF="01-$(tr ':' '-' <<< $SLX_PXE_MAC)"
+	fi
+
+	local UUID=$(dmidecode -q -s system-uuid | grep -v '^#' | head -n 1 | tr 'a-z' 'A-Z')
+	if [ "${#UUID}" -ne "36" ]; then
+		warn "Determined UUID (${UUID}) has not expected length of 36, falling back to MAC..."
+		# Maybe use /proc/sys/kernel/random/uuid ?
+		UUID=
+	else
+		# Got UUID, check blacklist
+		local DIR="/etc/bad-uuid.d"
+		local TMPLIST=$(mktemp)
+		local BADLIST=$(mktemp)
+		for file in "$DIR"/*; do
+			[ -f "$file" ] || continue
+			# 11111111-2222-3333-4444-555555555555
+			< "$file" tr 'a-z' 'A-Z' | grep -Eo '[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}'
+		done | tee "$TMPLIST" > "$BADLIST"
+		# Also add flipped version of bad uuids. Found some of them through googling and discovered that sometimes
+		# users report them in a different order. UUIDs use different endianness for the first three blocks than
+		# the remaining two, but some tools seem to ignore that fact.
+		< "$BADLIST" sed -r 's/^(..)(..)(..)(..)\-(..)(..)\-(..)(..)\-([0-9A-F]{4}\-[0-9A-F]{12})$/\4\3\2\1-\6\5-\8\7-\9/' >> "$TMPLIST"
+		# Finally make unique
+		sort -u "$TMPLIST" > "$BADLIST"
+		if grep -Fxq "$UUID" "$BADLIST"; then
+			warn "WARNING: 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
+			UUID="baad1d00-9491-4716-b98b-$UUID"
+		else
+			UUID="baad1d00-9491-4716-b98b-000000000000"
+		fi
+	fi
+	UUID=$( echo "$UUID" | tr 'a-z' 'A-Z' )
+	readonly UUID
+	echo "$UUID" > "/run/system-uuid"
+}
+
+get_system_uuid