watchfrr prints to the wrong shell

[Hallborg]

Description

I'm running a docker container with FRR installed. For some reason the watchfrr is always writing to the first shell that is connected.

The issue is that the frrinit.sh start | stop | reload does not work when running from any other shell.

Version

The test was performed on 8.4.4, but I have the same behavior on 10.2.1

How to reproduce

deploy a container with frr

docker run -it <img> sh

start a new shell

docker exec -it <container name> sh

Inside the second shell, start the frr service

It does not have to be a shell, using
docker run -it <img> top
will have the same result.

Expected behavior

when connecting to the second shell all output from watchfrr should go to that shell.

Actual behavior

The watchfrr output is printed to the first shell. (on PID 1)

Additional context

I'm aware that this might be a docker/docker config issue and not an FRR issue.

Checklist

• I have searched the open issues for this bug.
• I have not included sensitive information in this report.