Kompose not handling docker-compose file generated using `docker config` command

[elishkaflint]

Kompose cannot handle converting a docker-compose file, when variable placeholders have been replaced with values from a .env file (using the docker-compose config command). This is quite a common use-case, which I saw working with the same steps a couple of months ago, but it now fails with the error FATA services.rabbit-mq.ports.0 must be a string or number

original docker-compose.yml with variable placeholders:

rabbit-mq:
    image: rabbitmq:3-management
    hostname: my-rabbit
    ports:
    - "${RABBITMQ_PORT}:${RABBITMQ_PORT}"
    - "15672:15672"

.env file

RABBITMQ_PORT=5672

docker-compose-resolved.yml (output of running docker-compose config > docker-compose-resolved.yml)

  rabbit-mq:
    hostname: my-rabbit
    image: rabbitmq:3-management
    ports:
    - published: 5672
      target: 5672
    - published: 15672
      target: 15672

^^^ note the published and target fields in the ports section

when i run kompose convert -f docker-compose-resolved.yml I get this error:
FATA services.rabbit-mq.ports.0 must be a string or number

[elishkaflint]

If anyone else is encountering this issue, it's fixed by reverting to a release of docker-compose prior to version 1.27.3 (Docker Desktop Community 2.3.0.5). Or you can export the environment variables like this (before running kompose)

export $(grep -v '^#' .env | xargs)