i2c passthrough

[reubano]

Description

Can someone confirm if colima supports i2c passthrough? I am trying to read the sensors from a sense hat on an rpi and am getting permission errors. If i2c passthrough isn't supported, can you please add it to the roadmap?

[abiosoft]

What is i2c passthrough and how is it expected to work? Does it work with Docker Desktop?

[reubano]

It lets you read the gpio sensors. I think my issue is related to containers/podman#16558. i2c is in the /dev folder which is owned by nobody:nogroup. I haven't figured out a way to get the docker container to show the proper owners.

rpi

$ ls -la /dev | grep i2c
crw-rw----   1 root    i2c      89,   1 Jul 31 19:58 i2c-1
crw-rw----   1 root    i2c      89,  13 Jul 31 19:58 i2c-13
crw-rw----   1 root    i2c      89,  14 Jul 31 19:58 i2c-14

docker

$ docker exec -it sensehat-b-exporter ls -la /dev | grep i2c
crw-rw----   1 nobody nogroup  89,   1 Aug  1 00:58 i2c-1
crw-rw----   1 nobody nogroup  89,  13 Aug  1 00:58 i2c-13
crw-rw----   1 nobody nogroup  89,  14 Aug  1 00:58 i2c-14

[reubano]

I've gotten it to work building on the pi using a privileged docker container. I'm not sure if there is a way to make it work with rootless containers like colima or podman.