user-acpid-rs

non-root companion process for linux acpid ( https://sourceforge.net/projects/acpid2/ )

status

• works!

why

• we want a way to react to ACPI events and act upon an interactive user session
• this means being able to easily access the current dbus/wayland/pipewire/etc sessions
• acpid is great, but it executes hooks as root instead of as the current interactive user
• it's quite (intentionally) fiddly for anyone except that user to access user session sockets, buses, etc
• this tool is intended to be executed as a non-root user in the context of their interactive session

use cases

• in combination with wlr-randr, turn on/off a built-in display based on laptop lid status
• turn on/off a built-in USB webcam based on laptop lid status
• in combination with pw-cli, turn on/off a built-in USB microphone based on laptop lid status

dependencies

• requires your system to be running acpid with the default --socketfile behaviour

roadmap

• read events from /var/run/acpid.socket
• identify lid open and lid close ACPI events
• run ~/.config/user-acpid/button-lid-open when opened
• run ~/.config/user-acpid/button-lid-close when closed
• check lid status on startup
• support alternative paths to acpid's socket file
• handle socket closure and attempt to re-open after a delay
• close and re-open socket after receiving SIGUSER1 signal
• explore direct kernel access (independence from acpid)