Missing CAN J1939 support and vcan0 in latest docket image. #618

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1. wglambert

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   RequestRequest for image modification or featureRequest for image modification or feature

   on Jun 7, 2021
2. tianon commented on Jun 7, 2021

   

   tianon

   on Jun 7, 2021

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   Can you provide a simple reproducer, perhaps in the form of a single docker run one-liner that imports a module which currently fails but will succeed if we have the appropriate header available during compilation?
4. yosifkit commented on Jun 7, 2021

   

   yosifkit

   on Jun 7, 2021

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   It looks like j1939.h doesn't exist until Debian Bullseye which has not migrated to stable yet, so we don't have a python image based on it.

   https://packages.debian.org/search?suite=buster&searchon=contents&keywords=j1939.h
   https://packages.debian.org/search?suite=bullseye&searchon=contents&keywords=j1939.h

   If python were compiled with this support, would it have issues running for users still on kernels earlier than 5.10?
7. yosifkit commented on Jun 8, 2021

   

   yosifkit

   on Jun 8, 2021

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   Just checked, I was active in raspbian repo 25 days ago, so I don't understand how this header file did not make it into bullseye while raspbian buster already had it.
   raspberrypi/linux#4346

   It is in Bullseye, but Bullseye is not yet fully released so we haven't made an image based upon it. When it is released, we will add an image.

   ---

   For vcan devices, that is likely just missing capabilities (probably --cap-add NET_ADMIN). But I don't know if things like gitlab runners allow a cap-add. So nothing we can do in the image.

   $ docker run -it --rm debian
   Unable to find image 'debian:latest' locally
   latest: Pulling from library/debian
   Digest: sha256:acf7795dc91df17e10effee064bd229580a9c34213b4dba578d64768af5d8c51
   Status: Downloaded newer image for debian:latest
   root@92473bfa43af:/# ip link add type vcan
   RTNETLINK answers: Operation not permitted
   root@92473bfa43af:/# 
9. tianon commented on Aug 20, 2021

   

   tianon

   on Aug 20, 2021

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   Fixed by #633 👍
10. tianon

    closed this as completedon Aug 20, 2021