Static device name for udev discover device

[cbergmann]

hi, I have a working setup where a usb device is discovered by udev and mapped into a pod.

The device name on the node is '/dev/ttyUSB0' and this is also available in the container in the pod.

I am planing on adding another device to the node that will also have a '/dev/ttyUSB*' name. Unfortunately the application (zigbee2mqtt) needs a device path. I am not sure if the desired device will aways be ttyUSB0.

While running zigbee2mqtt directly on the node I had the following udev rule aktive:
SUBSYSTEM=="tty", ATTRS{idVendor}=="1a86", ATTRS{idProduct}=="7523", SYMLINK+="ttyUSB-zigstar", GROUP="dialout", MODE="0660"
This would ensure that there would alway be a device '/dev/ttyUSB-zigstar' to set in the configuration.
Unfortunately '+=' is not allowed in akri udev rules.

I was not able to find another way to add a "stable" alias to the device name in the pod.
Am I missing something?

Thanks
Clemens

[jonatanolofsson]

@gauravgahlot Perhaps you can shed some light here? I too am struggling with finding how to set a static name to the akri mounted CDI - i assume it is possible, because it's such a fundamental thing to know the name of the device with which to interact. I know that $UDEV_DEVNODE_* contains the device, but having it in an environment variable makes no-one with a pre-made helmchart/container happy if it expects e.g. /dev/zwave. Also, with multiple CDIs the environment variables become even more useless..

So the question is

• How can we specify the NAME or SYMLINK of the device in the container?

All the best,
Jonatan