env in docker compose

[BenjaminQuandt]

Hi,

i use the setEnv with a docker-compose.yml. Overall it works, but i want to know how the setEnv will be replace the var in the file.
I use a port var in my docker-compose file:

ports:
      - $port

what i change with that:

DockerComposeContainer container = new DockerComposeContainer(file);
container.withEnv("port", "1234:4567");

That works just fine, but i also want to use it in path mappings:

      - ./../../logs1:/mylog

I want to split the logs, so i need to replace the 1 with something else.
How do i do that? how does it notice, that i only swaped a part of it?
Or is it not possible and i have to replace the whole string (./../../logs1:/mylog)?

Thank you,
Benjamin