#!/usr/bin/env -S docker build . --tag=jcosmao/cron-git --network=host --file

# docker push jcosmao/cron-git

FROM alpine:latest

ARG UNAME=user
ARG UID=1000
ARG GID=1000

USER root

RUN addgroup --system --gid ${GID} ${UNAME}
RUN adduser --system --disabled-password --home /home/${UNAME} \
    --uid ${UID} --ingroup ${UNAME} ${UNAME}

RUN apk update \
    && apk upgrade \
    && apk --no-cache add dcron libcap

RUN apk fix && \
    apk --no-cache --update add git git-lfs gpg less openssh patch mandoc man-pages bash && \
    git lfs install

RUN chown $UID:$GID /usr/sbin/crond \
    && setcap cap_setgid=ep /usr/sbin/crond

COPY --chown=$UID:$GID entrypoint.sh /home/$UNAME/entrypoint.sh
RUN chmod +x /home/$UNAME/entrypoint.sh

USER $UNAME
RUN mkdir /home/$UNAME/crontabs && touch /home/$UNAME/crontabs/$UNAME
WORKDIR /home/$UNAME

# install a cronjob:
# echo SHELL=/bin/sh > ~/crontabs/user
# echo '* * * * *  my_cron' >> ~/crontabs/user

# crond fail to setgid if run as PID 1
ENTRYPOINT ["./entrypoint.sh"]