FROM debian:buster-slim

SHELL ["/bin/bash", "-c"]

RUN apt update -yq && \
    DEBIAN_FRONTEND=noninteractive apt install -yq --no-install-recommends \
        build-essential \
        ca-certificates gnupg wget \
        sudo \
        nano vim

# Install gosu (better sudo, basically).
ARG GOSU_VERSION=1.12
RUN DPKG_ARCH="$( dpkg --print-architecture | awk -F- '{ print $NF }' )" && \
    wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$DPKG_ARCH" && \
    wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$DPKG_ARCH.asc" && \
    export GNUPGHOME="$( mktemp -d )" && \
    gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 && \
    gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu && \
    gpgconf --kill all && \
    rm -rf -- "$GNUPGHOME" /usr/local/bin/gosu.asc && \
    chmod +x /usr/local/bin/gosu && \
    gosu nobody true

ARG DEFAULT_UID=999
ARG DEFAULT_GID="$DEFAULT_UID"

ARG JEKYLL_UID
ARG JEKYLL_GID
RUN test -n "$JEKYLL_UID" && test -n "$JEKYLL_GID"
ENV JEKYLL_UID="$JEKYLL_UID"
ENV JEKYLL_GID="$JEKYLL_GID"

RUN if [ "$JEKYLL_UID" = 0 ]; then JEKYLL_UID="$DEFAULT_UID"; fi && \
    if [ "$JEKYLL_GID" = 0 ]; then JEKYLL_GID="$DEFAULT_GID"; fi && \
    addgroup --gid "${JEKYLL_GID:-$DEFAULT_GID}" jekyll && \
    adduser \
        --disabled-password \
        --gecos '' \
        --home /home/jekyll \
        --ingroup jekyll \
        --uid "${JEKYLL_UID:-$DEFAULT_UID}" \
        jekyll && \
    addgroup jekyll sudo && \
    echo -e '%sudo ALL=(ALL) NOPASSWD:ALL\nDefaults env_keep += "HOME"' >> /etc/sudoers

RUN mkdir /utils && chown jekyll /utils
WORKDIR /utils
COPY --chown=jekyll:jekyll ["Makefile", "./"]

ENV PATH="/home/jekyll/.local/bin:$PATH"

RUN gosu jekyll make ruby-install && \
    gosu jekyll make ruby-install/clean && \
    gosu jekyll make ruby && \
    gosu jekyll make chruby && \
    gosu jekyll make chruby/.bashrc && \
    gosu jekyll make chruby/clean && \
    gosu jekyll make bundler

COPY ["docker-entrypoint.sh", "/"]
ENTRYPOINT ["/docker-entrypoint.sh"]