/usr/share/live/build/hooks/004-remove-dbus-machine-id.chroot is in live-build 3.0~a57-1ubuntu25.
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
set -e
# Remove dbus machine id.
#
# This removes dbus machine id that cache that makes each system unique.
rm -f /var/lib/dbus/machine-id
# truncate, do not remove otherwise systemd is unhappy
printf "" > /etc/machine-id
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