systemd-gpio
Requirements:
- WiringPi "gpio" utility
- Some GPIO attached buttons
- Distro that uses systemd (eg Raspbian)
Set Up:
- cp gpio-trigger@.service /etc/systemd/system
- mkdir /etc/systemd-gpio
- cp examples/shutdown /etc/systemd-gpio
- systemctl reenable gpio-trigger@shutdown
You may create an environment file with any name in /etc/systemd-gpio and then enable it as gpio-trigger@name-you-used.