README.md

1. Install Xquartz and socat

brew install socat    
brew install --cask xquartz  
defaults write org.xquartz.X11 enable_iglx -bool true  
defaults write org.xquartz.X11 nolisten_tcp -bool false

2. Reboot

3. Run script

docker build -t openloco-x11 .   
(in another terminal) socat TCP-LISTEN:6000,reuseaddr,fork UNIX-CLIENT:\"$DISPLAY\"
./run.sh

Dockerfile

FROM ubuntu:18.04
RUN dpkg --add-architecture i386 \
    && apt-get update \
    && apt-get -y upgrade \
    && apt-get install --no-install-recommends -y \
        clang \
        cmake \
        g++-multilib \
        gcc-multilib \
        git \
        libpng-dev:i386 \
        libsdl2-dev:i386 \
        libsdl2-mixer-dev:i386 \
        libyaml-cpp-dev:i386 \
        ninja-build \
        pkg-config:i386 \
    && apt-get clean

RUN apt-get update \
    && apt-get install -y \
        ssh \
        rsync \
        gdb \
    && apt-get clean

VOLUME /opt/locomotion

RUN ( \
    echo 'LogLevel DEBUG2'; \
    echo 'PermitRootLogin yes'; \
    echo 'PasswordAuthentication yes'; \
    echo 'Subsystem sftp /usr/lib/openssh/sftp-server'; \
  ) > /etc/ssh/sshd_config_test_clion \
  && mkdir /run/sshd

RUN useradd -m user \
  && yes password | passwd user

RUN usermod -s /bin/bash user

CMD ["/usr/sbin/sshd", "-D", "-e", "-f", "/etc/ssh/sshd_config_test_clion"]

run.sh

#!/usr/bin/env bash

docker stop clion_remote_env
docker rm clion_remote_env
# docker build -t openloco-x11 .
docker run -d \
    --cap-add sys_ptrace \
    --security-opt seccomp=unconfined \
    -p2233:22 \
    -e DISPLAY=host.docker.internal:0 \
    -v ~/Downloads/gog-loco:/opt/locomotion \
    -v /tmp/.X11-unix:/tmp/.X11-unix \
    --name clion_remote_env openloco-x11
ssh-keygen -f "$HOME/.ssh/known_hosts" -R "[localhost]:2233"