source code: init/goofy.d/device_id_changed/README.md

Chrome OS Factory scripts when Device ID changed.

Script here will be executed when a device ID change is detected, executed by /usr/local/factory/init/goofy.d/device_id.sh.

To add your own service, create a script file with .sh in file name extension and enable execute (+x) permission.

Usually this is done by adding a file in private board overlay, for example src/private-overlays/overlay-coral-private/chromeos-base/factory-board/files/init/goofy.d/device_id_changed/reset_something.sh that the reset_something must be a simple shell script.