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#!/bin/ash
# Slighty changed version of:
# http://git.openslx.org/openslx-ng/mltk.git/plain/core/modules/system-uuid/data/bin/get-uuid
UUID=$(dmidecode -q -s system-uuid | grep -v '^#' | head -n 1 | tr 'a-z' 'A-Z')
if [ "${#UUID}" -ne "36" ]; then
echo "Determined UUID ${UUID} has not expected length of 36, falling back to MAC..."
UUID=
else
# Got UUID, check blacklist
DIR="/etc/bad-uuid.d"
TMPLIST=$(mktemp)
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
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
# 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' )
echo "Final UUID is $UUID"
echo "$UUID" > "/run/system-uuid"
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