/usr/share/live/build/hooks/0180-remove-systemd-machine-id.chroot is in live-build 3.0.5-1.
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 | #!/bin/sh
set -e
# Remove systemd machine id.
#
# This removes systemd machine id that cache that makes each system unique.
rm -f /etc/machine-id
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