LambCI Image bug

file.rb

def func(event:, context:)
  nil[]
end

run-image.sh

docker run --rm -v "$PWD":/var/task:ro,delegated lambci/lambda:ruby2.5 file.func

#START RequestId: 0f54aca5-6eaf-15d0-6ea0-107e6034b792 Version: $LATEST
#Critical exception from handler
#{
#  "errorMessage": "undefined method `[]' for nil:NilClass",
#  "errorType": "Function<NoMethodError>",
#  "stackTrace": [
#    "/var/task/file.rb:2:in `func'"
#  ]
#}

# This container is now stuck. It only gets stuck for some types of errors.

# this is what localstack does then: (cocky_montalcini is the name of the running container)
docker exec -e AWS_LAMBDA_EVENT_BODY="$AWS_LAMBDA_EVENT_BODY" -e HOSTNAME="$HOSTNAME" -e LOCALSTACK_HOSTNAME="$LOCALSTACK_HOSTNAME" -e AWS_LAMBDA_FUNCTION_TIMEOUT="$AWS_LAMBDA_FUNCTION_TIMEOUT" -e AWS_LAMBDA_FUNCTION_NAME="$AWS_LAMBDA_FUNCTION_NAME" -e AWS_LAMBDA_FUNCTION_VERSION="$AWS_LAMBDA_FUNCTION_VERSION" -e AWS_LAMBDA_FUNCTION_INVOKED_ARN="$AWS_LAMBDA_FUNCTION_INVOKED_ARN" -e _LAMBDA_SERVER_PORT="$_LAMBDA_SERVER_PORT" cocky_montalcini /var/rapid/init --bootstrap /var/runtime/bootstrap file.func

# now we get
# 2020/02/06 16:21:10 listen tcp :9001: bind: address already in use