Script to extract environment variables from a ECS service

ecs-env.sh

#!/bin/sh

print_help() {
  echo "Extract environment variables from an ECS service."
  echo
  echo "Usage: $0 [OPTIONS] SERVICE"
  echo
  echo "Options:"
  echo "    -h, --help      Print usage"
}

ecs_env() {
  aws ecs describe-task-definition \
    --task-definition "$1-taskdef" \
    --region "${AWS_DEFAULT_REGION-eu-west-1}" \
    --query "taskDefinition.containerDefinitions[].environment[].[join('=', [name, value])]" \
    --output text
}

case "$1" in
  "" )
    print_help
    exit 1
    ;;

  -h | --help )
    print_help
    ;;

  * )
    ecs_env "$@"
    ;;
esac

ecs-image.sh

#!/bin/sh

print_help() {
  echo "Extract the Docker image (or images) from an ECS service."
  echo
  echo "Usage: ecs-image [OPTIONS] SERVICE"
  echo
  echo "Options:"
  echo "    -h, --help      Print usage"
}

ecs_image() {
  aws ecs describe-task-definition \
    --task-definition "$1-taskdef" \
    --region "${AWS_DEFAULT_REGION-eu-west-1}" \
    --query "taskDefinition.containerDefinitions[].[image]" \
    --output text
}

case "$1" in
  "" )
    print_help
    exit 1
    ;;

  -h | --help )
    print_help
    ;;

  * )
    ecs_image "$@"
    ;;
esac

ecs-run.sh

#!/bin/bash

print_help() {
  echo "Run a Docker container with the same image and environment"
  echo "variables as the given ECS service."
  echo
  echo "Usage: ecs-run [OPTIONS] SERVICE [COMMAND]"
  echo
  echo "Options:"
  echo "    -h, --help      Print usage"
}

ecs_run() {
  SERVICE="$1"
  shift
  docker run --rm -it --env-file <(ecs-env "${SERVICE}") "$(ecs-image "${SERVICE}")" "$@"
}

case "$1" in
  "" )
    print_help
    exit 1
    ;;

  -h | --help )
    print_help
    ;;

  * )
    ecs_run "$@"
    ;;
esac