FROM ubuntu:20.04

# see https://github.com/moby/moby/issues/4032#issuecomment-192327844
ARG DEBIAN_FRONTEND=noninteractive

COPY su-exec.c /su-exec.c

# ARG for quick switch to a given ubuntu mirror
ARG apt_archive="http://archive.ubuntu.com"
RUN sed -i "s|http://archive.ubuntu.com|${apt_archive}|g" /etc/apt/sources.list \
    && groupadd -r clickhouse --gid=101 \
    && useradd -r -g clickhouse --uid=101 --home-dir=/var/lib/clickhouse --shell=/bin/bash clickhouse \
    && apt-get update \
    && apt-get install --yes --no-install-recommends \
        apt-transport-https \
        ca-certificates \
        dirmngr \
        gnupg \
        locales \
        wget \
        tzdata \
    && apt-get install -y --no-install-recommends tcc libc-dev && \
        tcc /su-exec.c -o /bin/su-exec && \
        chown root:root /bin/su-exec && \
        chmod 0755 /bin/su-exec && \
        rm /su-exec.c && \
        apt-get purge -y --auto-remove tcc libc-dev libc-dev-bin libc6-dev linux-libc-dev \
    && apt-get clean

ARG REPO_CHANNEL="stable"
ARG REPOSITORY="deb https://packages.clickhouse.com/deb ${REPO_CHANNEL} main"
ARG VERSION=22.1.1.*
ARG PACKAGES="clickhouse-client clickhouse-server clickhouse-common-static"

# set non-empty deb_location_url url to create a docker image
# from debs created by CI build, for example:
# docker build . --network host --build-arg version="21.4.1.6282" --build-arg deb_location_url="https://clickhouse-builds.s3.yandex.net/21852/069cfbff388b3d478d1a16dc7060b48073f5d522/clickhouse_build_check/clang-11_relwithdebuginfo_none_bundled_unsplitted_disable_False_deb/" -t filimonovq/clickhouse-server:pr21852
ARG deb_location_url=""

# set non-empty single_binary_location_url to create docker image
# from a single binary url (useful for non-standard builds - with sanitizers, for arm64).
# for example (run on aarch64 server):
# docker build . --network host --build-arg single_binary_location_url="https://builds.clickhouse.com/master/aarch64/clickhouse" -t altinity/clickhouse-server:master-testing-arm
# note: clickhouse-odbc-bridge is not supported there.
ARG single_binary_location_url=""

# user/group precreated explicitly with fixed uid/gid on purpose.
# It is especially important for rootless containers: in that case entrypoint
# can't do chown and owners of mounted volumes should be configured externally.
# We do that in advance at the begining of Dockerfile before any packages will be
# installed to prevent picking those uid / gid by some unrelated software.
# The same uid / gid (101) is used both for alpine and ubuntu.

# To drop privileges, we need 'su' command, that simply changes uid and gid.
# In fact, the 'su' command from Linux is not so simple, due to inherent vulnerability in Linux:
# https://ruderich.org/simon/notes/su-sudo-from-root-tty-hijacking
# It has to mitigate this drawback of Linux, and to do this, 'su' command is creating it's own pseudo-terminal
# and forwarding commands. Due to some ridiculous curcumstances, it does not work in Docker (or it does)
# and for these reasons people are using alternatives to the 'su' command in Docker,
# that don't mess with the terminal, don't care about closing the opened files, etc...
# but can only be safe to drop privileges inside Docker.
# The question - what implementation of 'su' command to use.
# It should be a simple script doing about just two syscalls.
# Some people tend to use 'gosu' tool that is written in Go.
# It is not used for several reasons:
# 1. Dependency on some foreign code in yet another programming language - does not sound alright.
# 2. Anselmo D. Adams suggested not to use it due to false positive alarms in some undisclosed security scanners.

ARG TARGETARCH

RUN arch=${TARGETARCH:-amd64} \
    && if [ -n "${deb_location_url}" ]; then \
        echo "installing from custom url with deb packages: ${deb_location_url}" \
        rm -rf /tmp/clickhouse_debs \
        && mkdir -p /tmp/clickhouse_debs \
        && for package in ${PACKAGES}; do \
            { wget --progress=bar:force:noscroll "${deb_location_url}/${package}_${VERSION}_${arch}.deb" -P /tmp/clickhouse_debs || \
                wget --progress=bar:force:noscroll "${deb_location_url}/${package}_${VERSION}_all.deb" -P /tmp/clickhouse_debs ; } \
            || exit 1 \
        ; done \
        && dpkg -i /tmp/clickhouse_debs/*.deb ; \
    elif [ -n "${single_binary_location_url}" ]; then \
        echo "installing from single binary url: ${single_binary_location_url}" \
        && rm -rf /tmp/clickhouse_binary \
        && mkdir -p /tmp/clickhouse_binary \
        && wget --progress=bar:force:noscroll "${single_binary_location_url}" -O /tmp/clickhouse_binary/clickhouse \
        && chmod +x /tmp/clickhouse_binary/clickhouse \
        && /tmp/clickhouse_binary/clickhouse install --user "clickhouse" --group "clickhouse" ; \
    else \
        mkdir -p /etc/apt/sources.list.d \
        && apt-key adv --keyserver keyserver.ubuntu.com --recv 8919F6BD2B48D754 \
        && echo ${REPOSITORY} > /etc/apt/sources.list.d/clickhouse.list \
        && echo "installing from repository: ${REPOSITORY}" \
        && apt-get update \
        && apt-get --yes -o "Dpkg::Options::=--force-confdef" -o "Dpkg::Options::=--force-confold" upgrade \
        && for package in ${PACKAGES}; do \
            apt-get install --allow-unauthenticated --yes --no-install-recommends "${package}=${VERSION}" || exit 1 \
        ; done \
    ; fi \
    && clickhouse-local -q 'SELECT * FROM system.build_options' \
    && rm -rf \
        /var/lib/apt/lists/* \
        /var/cache/debconf \
        /tmp/* \
    && mkdir -p /var/lib/clickhouse /var/log/clickhouse-server /etc/clickhouse-server /etc/clickhouse-client \
    && chmod ugo+Xrw -R /var/lib/clickhouse /var/log/clickhouse-server /etc/clickhouse-server /etc/clickhouse-client

# we need to allow "others" access to clickhouse folder, because docker container
# can be started with arbitrary uid (openshift usecase)

RUN locale-gen en_US.UTF-8
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US:en
ENV LC_ALL en_US.UTF-8
ENV TZ UTC

RUN mkdir /docker-entrypoint-initdb.d

COPY docker_related_config.xml /etc/clickhouse-server/config.d/
COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh

EXPOSE 9000 8123 9009
VOLUME /var/lib/clickhouse

ENV CLICKHOUSE_CONFIG /etc/clickhouse-server/config.xml

ENTRYPOINT ["/entrypoint.sh"]