Running zelt in docker

[Olamyy]

Describe the bug
I have a simple docker container where I run zelt. For some reason (the error log is not really clear), I get a NoneType error.

Zelt version
Output of the command zelt --version.
1.2.15

To Reproduce

1. Create a dockerfile

FROM registry.opensource.zalan.do/stups/ubuntu:18.04-15

ENV REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
RUN apt-get update && apt-get install -y jq python3-dev python3-zmq python3-pip && rm -rf /var/lib/apt/lists/*

RUN pip3 install --upgrade locust

RUN pip3 install zelt

COPY examples /tmp/examples

ENTRYPOINT ["zelt" , "from-locustfile", "/tmp/examples/locustfile/locustfile.py", "--manifests", "/tmp/examples/manifests/combined", "-w", "5"]

2. Build and run the docker file : docker build -t zelt-test-docker . && docker run -i -t zelt-test-docker
3. See error

Expected behavior
zelt should start the load test with no error.

Screenshots

[thilp]

Just discussed with Ola and I learned additional things:

• it only happens when running in Docker;
• it happens with both major versions of Locust;
• the locustfile used here is the one shipped as example in this repository.