Issue to install python libraries inside locust container when using the locust docker image version 2.8.1

[teixeira-fernando]

Describe the bug

When I started to use the latest 2.8.1 locust docker image, I had some issues when trying to install other python libraries inside the container, with my own Dockerfile. When I used the version 2.7.3, everything worked fine.

The error that is returned says that there is a permission issue in the installation process:

[2022-02-14T08:04:31.832Z] ERROR: Could not install packages due to an OSError: [Errno 13] Permission denied: '/opt/venv/lib/python3.9/site-packages/dotenv'

Expected behavior

We should be able to install other python libraries inside the locust container using the pip command.

Actual behavior

[2022-02-14T08:04:17.739Z] + docker-compose up --scale worker=4 --force-recreate --exit-code-from=master
[2022-02-14T08:04:18.003Z] /usr/lib/python2.7/site-packages/requests/__init__.py:91: RequestsDependencyWarning: urllib3 (1.25.3) or chardet (2.2.1) doesn't match a supported version!
[2022-02-14T08:04:18.003Z]   RequestsDependencyWarning)
[2022-02-14T08:04:18.952Z] using --exit-code-from implies --abort-on-container-exit
[2022-02-14T08:04:18.952Z] Creating network "loadtest_default" with the default driver
[2022-02-14T08:04:18.952Z] Building worker
[2022-02-14T08:04:19.214Z] Step 1/4 : FROM locustio/locust
[2022-02-14T08:04:20.611Z] latest: Pulling from locustio/locust
[2022-02-14T08:04:30.628Z] Digest: sha256:8a5ee67f76fa08fbf1126be514d2d11a9dd580d2168815edf26e55d0d5014e65
[2022-02-14T08:04:30.628Z] Status: Downloaded newer image for locustio/locust:latest
[2022-02-14T08:04:30.628Z]  ---> 4f8ce510a092
[2022-02-14T08:04:30.628Z] Step 2/4 : RUN pip3 install python-dotenv
[2022-02-14T08:04:30.628Z]  ---> Running in 8cc93894c9be
[2022-02-14T08:04:31.569Z] Collecting python-dotenv
[2022-02-14T08:04:31.569Z]   Downloading python_dotenv-0.19.2-py2.py3-none-any.whl (17 kB)
[2022-02-14T08:04:31.832Z] Installing collected packages: python-dotenv
[2022-02-14T08:04:31.832Z] ERROR: Could not install packages due to an OSError: [Errno 13] Permission denied: '/opt/venv/lib/python3.9/site-packages/dotenv'
[2022-02-14T08:04:31.832Z] Check the permissions.
[2022-02-14T08:04:31.832Z] 
[2022-02-14T08:04:32.094Z] WARNING: You are using pip version 21.2.4; however, version 22.0.3 is available.
[2022-02-14T08:04:32.094Z] You should consider upgrading via the '/opt/venv/bin/python -m pip install --upgrade pip' command.
[2022-02-14T08:04:32.358Z] Service 'worker' failed to build: The command '/bin/sh -c pip3 install python-dotenv' returned a non-zero code: 1

Steps to reproduce

This is my Docker file that I used to reproduce the error:

FROM locustio/locust
RUN pip3 install python-dotenv
RUN pip3 install locust-plugins

If you try to build it, it will take the latest version 2.8.1, and the error described above will happen.

Environment

• OS: Windows 10 Enterprise (OS build 19042.1466)
• Python version: Not applicable
• Locust version: 2.8.1

[teixeira-fernando]

I can see that there were some changes introduced in the locust Dockerfile comparing the versions 2.8.1 and 2.7.3. Maybe we can start the investigation from there: 2.7.3...2.8.1

[cyberw]

Huh. I tested that, but must have messed my test up somehow. I'll release 2.8.2 shortly with this fix...