FROM ubuntu:22.04

ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update && apt-get install -y --no-install-recommends \
        squid \
    && rm -rf /var/lib/apt/lists/*

# Give the proxy system user (UID 13) ownership of all Squid paths
RUN mkdir -p /var/spool/squid /var/log/squid \
    && chown -R proxy:proxy /var/spool/squid /var/log/squid /etc/squid

COPY --chown=proxy:proxy proxy/squid.conf /etc/squid/squid.conf

USER proxy

# Initialise cache directories as the proxy user
RUN squid -N -f /etc/squid/squid.conf -z 2>/dev/null || true

EXPOSE 3128

HEALTHCHECK --interval=10s --timeout=5s --retries=3 \
    CMD /bin/bash -c 'echo >/dev/tcp/127.0.0.1/3128'

CMD ["squid", "-N", "-f", "/etc/squid/squid.conf"]