"cannot import name '_spacecraft' from 'Basilisk.simulation'"

[patrickwalton]

I'm trying to get Basilisk v2.3.0 working on a Docker container running Ubuntu 20.04. I'm running into the following error when trying to import the spacecraft module.

(.venv) careweather@2292b05a4a04:~/basilisk$ python3
Python 3.8.10 (default, Nov 22 2023, 10:22:35) 
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import Basilisk
>>> from Basilisk.simulation import spacecraft
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/careweather/basilisk/dist3/Basilisk/simulation/spacecraft.py", line 18, in <module>
    from . import _spacecraft
ImportError: cannot import name '_spacecraft' from 'Basilisk.simulation' (/home/careweather/basilisk/dist3/Basilisk/simulation/__init__.py)

Here's the Dockerfile for reference:

FROM ubuntu:22.04

# Set environment variable to avoid interactive prompts
ENV DEBIAN_FRONTEND=noninteractive

# Add a new user and group
RUN groupadd -r careweather && useradd -r -m -g careweather careweather

# Create home directory and set permissions
RUN chown -R careweather:careweather /home/careweather

# Install system dependencies
RUN apt-get update && apt-get install -y \
    tzdata \
    git \
    build-essential \
    python3 \
    python3-setuptools \
    python3-dev \
    python3-tk \
    python3-pip \
    swig \
    vim

# Set timezone to UTC
RUN ln -fs /usr/share/zoneinfo/Etc/UTC /etc/localtime && \
    dpkg-reconfigure --frontend noninteractive tzdata

# Capture Python version and install corresponding venv package
RUN PYTHON_VERSION=$(python3 --version 2>&1) && \
    PYTHON_VERSION_NUMBER=$(echo $PYTHON_VERSION | grep -oP '(?<=Python )\d+\.\d+') && \
    apt-get install -y python${PYTHON_VERSION_NUMBER}-venv

# Switch to the new user
USER careweather

# Set the home directory environment variable for the new user
ENV HOME=/home/careweather
WORKDIR $HOME

# Get the Basilisk source
RUN git clone https://github.com/AVSLab/basilisk.git

WORKDIR $HOME/basilisk

# Switch to the latest release to avoid the nightlies
RUN git checkout v2.3.0

# Install in virtual environment
RUN python3 -m venv .venv

# Install Python dependencies
RUN . .venv/bin/activate && pip3 install wheel 'conan<2.0.0' cmake setuptools

# Install Basilisk
RUN . .venv/bin/activate && python3 conanfile.py

# Interactive setup
ENV DEBIAN_FRONTEND=dialog