/usr/lib/xcp/lib/update-mh-info is in xcp-xapi 1.3.2-5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #! /bin/sh
#
# Copyright (c) Citrix Systems 2008. All rights reserved.
#
[ -z "$1" ] && exit 0
mgmt_mac=$(ip link show $1 | awk '/link.ether/ {print $2}')
[ -z "$mgmt_mac" ] && exit 0
xenstore-write -s /mh/boot-time/management-mac-address $mgmt_mac
xenstore-chmod -s /mh/boot-time/management-mac-address r0
exit 0
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