FROM ubuntu:20.04

# install and configure munin
ARG DEBIAN_FRONTEND=noninteractive
# hadolint ignore=DL3008
RUN apt-get update -qq \
    && apt-get install -y -qq cron munin nginx apache2 wget libapache2-mod-fcgid libcgi-fast-perl ssmtp mailutils curl tzdata autoconf --no-install-recommends \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/*

RUN (cp /etc/munin/apache24.conf /etc/apache2/sites-available/000-default.conf) \
    && (sed -i 's/^Alias.*/Alias \/ \/var\/cache\/munin\/www\//g' /etc/apache2/sites-available/000-default.conf) \
    && (sed -i 's/Allow from .*/Satisfy Any/g' /etc/apache2/sites-available/000-default.conf) \
    && (sed -i 's/Order allow,deny.*/Allow from all/g' /etc/apache2/sites-available/000-default.conf) \
    && (mkdir -p /var/run/munin) \
    && (chown -R munin:munin /var/run/munin) \
    && (chfn -f 'munin' root) \
    && (/usr/sbin/a2enmod fcgid)

COPY 000-default.conf /etc/apache2/sites-available/000-default.conf
COPY logrotate-munin /etc/logrotate.d/munin
COPY munin.conf /etc/munin/munin.conf
COPY ssmtp.conf /etc/ssmtp/ssmtp.conf
COPY revaliases /etc/ssmtp/revaliases
COPY munin_mail.conf /etc/munin/munin-conf.d/munin_mail.conf
COPY slack_munin.sh /usr/local/bin/notify_slack_munin
RUN chmod +x /usr/local/bin/notify_slack_munin
COPY munin_slack.conf /etc/munin/munin-conf.d/munin_slack.conf

# copy launcher
COPY run.sh /usr/local/bin/run
RUN chmod +x /usr/local/bin/run

# persist
VOLUME /var/lib/munin
VOLUME /var/log/munin
VOLUME /var/cache/munin

EXPOSE 80

# launcher
CMD ["/usr/local/bin/run"]