FROM docker.io/library/ubuntu:24.04

ENV container=docker \
    DEBIAN_FRONTEND=noninteractive

COPY ./root /

RUN apt-get update && \
    apt-get install -y --no-install-recommends \
      sudo systemd findutils \
      iproute2 iputils-ping wireguard wireguard-tools \
      openssh-server #&& \
    # apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
    # as the spec says

RUN find /etc/systemd/system /lib/systemd/system \
      -path '*.wants/*' \
      -not -name '*journald*' \
      -not -name '*systemd-tmpfiles*' \
      -not -name '*systemd-user-sessions*' \
      -print0 | xargs -0 rm -vf

RUN systemctl enable \
      wg-quick@wg0.service \
      ssh.socket

RUN useradd -m judge -s /bin/bash

VOLUME ["/sys/fs/cgroup"]
ENTRYPOINT ["/lib/systemd/systemd"]
CMD []