Expose external port of docker disposable container to .env file

export_external_docker_port.sh

#!/bin/bash

API_DOCKER_IMAGE_NAME="<image name>"
API_PORT=<port>  #specify the port exposed in your dockerfile

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
ROOT="$(dirname "${SCRIPT_DIR}")"

if [[ $(docker ps --filter ancestor=${API_DOCKER_IMAGE_NAME} --format "{{.Status}}") ]]; then

  #save name of running disposable for our image for reuse
  RUNNING_DISPOSABLE=$(docker ps --filter ancestor=${API_DOCKER_IMAGE_NAME} --format "{{.Names}}")

  API_URL=$(docker port ${RUNNING_DISPOSABLE} ${API_PORT})

  # output api url to .env file to be used
  if [ -f "${ROOT}/.env" ]; then

    sed -i '' "s/^API_URL=.*/API_URL=$API_URL/g" ${ROOT}/.env

  else
    echo "API_URL=${API_URL}" >> ${ROOT}/.env
  fi

else

  echo "the docker image isnt running, start it and try again"

fi