Hi all!
I can use my RFID reader via Python fine:However, I'm getting the following error when running from a Docker container:
My Docker setup is the following:There's some discussion online about giving users access to SPI (and other GPIO stuff), but they focus on non-root access, and I don't think they apply here as I can actually use SPI fine from host and I'm using the default root user inside Docker. It seems to be a permissions issue as if I open a terminal inside my running container I can see the following:
and
I've tried to change permissions but failed:
I've also tried chown but get the same.
Any ideas? Thanks![:)]( "Smile")
I can use my RFID reader via Python fine:
Code:
import RPi.GPIO as GPIOfrom mfrc522 import SimpleMFRC522reader = SimpleMFRC522()try: id = reader.read()[0] print("The ID for this card is:", id)finally: GPIO.cleanup()Code:
Traceback (most recent call last): File "/usr/src/app/controller.py", line 30, in <module> reader = SimpleMFRC522() File "/usr/local/lib/python3.9/site-packages/mfrc522/SimpleMFRC522.py", line 14, in __init__ self.READER = MFRC522() File "/usr/local/lib/python3.9/site-packages/mfrc522/MFRC522.py", line 130, in __init__ self.spi.open(bus, device)PermissionError: [Errno 13] Permission deniedCode:
FROM python:3.9-alpineWORKDIR /usr/src/appCOPY controller .RUN apk add --update --no-cache gcc libc-dev gcompatRUN pip install --index-url=https://www.piwheels.org/simple --no-cache-dir -r requirements.txtCMD ["python", "controller.py"]Code:
version: '3.8'services: controller: build: . privileged: true volumes: - /lib/modules:/lib/modules - /sys:/sys - /dev:/dev devices: - /dev/spidev0.0 - /dev/spidev0.1Code:
/usr/src/app # ls -all /dev/*spi*crw-rw---- 1 nobody nobody 153, 0 Feb 2 19:24 /dev/spidev0.0crw-rw---- 1 nobody nobody 153, 1 Feb 2 19:24 /dev/spidev0.1Code:
/usr/src/app # whoamirootCode:
/usr/src/app # chmod 660 /dev/spidev0.0chmod: /dev/spidev0.0: Operation not permittedAny ideas? Thanks
Statistics: Posted by pperi — Sun Feb 04, 2024 5:54 pm — Replies 0 — Views 38