How to trigger a command on Linux when disconnected from power

9 months ago

Introduction to a simple alternative to BusKill for triggering actions when a laptop's power is disconnected.
Use case: Protecting an unlocked laptop from theft in public areas by powering off when disconnected from power.
Setup involves creating a udev rule and a script to execute on power disconnection on Linux.
For OpenBSD, the apmd daemon can be used as an alternative.
Steps to create and configure the udev rule and executable script provided.
Testing the setup involves unplugging the laptop to see if it powers off and checking logs for errors.
Script ideas range from locking user sessions to destroying LUKS master keys for security.
Conclusion highlights the usefulness of this method for laptops frequently used in public spaces while connected to power.

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