I removed my user from the
gpio group, logged out and back in. I can still run e.g.
gpio write 25 1.
I see from this answer how the memory mapping and permissions changed between Jessie and Stretch, but the instructions for leaving the
gpio group did not seem to work. I asked on IRC, and someone told me that WiringPi now uses "set uid" for the permission structure, and I see that mentioned on the WiringPi website here:
The gpio command is designed to be installed as a setuid program and called by a normal user without using the sudo command or logging in as root.
Am I going to have to compile WiringPi from source in order to change this behaviour?
$ lsb_release -a Distributor ID: Raspbian Description: Raspbian GNU/Linux 10 (buster) Release: 10 Codename: buster $ gpio -v gpio version: 2.50 Copyright (c) 2012-2018 Gordon Henderson This is free software with ABSOLUTELY NO WARRANTY. For details type: gpio -warranty Raspberry Pi Details: Type: Pi 3, Revision: 02, Memory: 1024MB, Maker: Unknown05 * Device tree is enabled. *--> Raspberry Pi 3 Model B Rev 1.2 * This Raspberry Pi supports user-level GPIO access.