FROM debian:buster-slim

# add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added

RUN groupadd -r -g 999 redis && useradd -r -g redis -u 999 redis

# grab gosu for easy step-down from root

# https://github.com/tianon/gosu/releases

ENV GOSU_VERSION 1.12

RUN set -eux; \

    savedAptMark="$(apt-mark showmanual)"; \

    apt-get update; \

    apt-get install -y --no-install-recommends ca-certificates dirmngr gnupg wget; \

    rm -rf /var/lib/apt/lists/*; \

    dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \

    wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \

    wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.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; \

    apt-mark auto '.*' > /dev/null; \

    [ -z "$savedAptMark" ] || apt-mark manual $savedAptMark > /dev/null; \

    apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \

    chmod +x /usr/local/bin/gosu; \

    gosu --version; \

    gosu nobody true

ENV REDIS_VERSION 6.0.15

ENV REDIS_DOWNLOAD_URL http://download.redis.io/releases/redis-6.0.15.tar.gz

ENV REDIS_DOWNLOAD_SHA 4bc295264a95bc94423c162a9eee66135a24a51eefe5f53f18fc9bde5c3a9f74

RUN set -eux; \

    \

    savedAptMark="$(apt-mark showmanual)"; \

    apt-get update; \

    apt-get install -y --no-install-recommends \

        ca-certificates \

        wget \

        \

        dpkg-dev \

        gcc \

        libc6-dev \

        libssl-dev \

        make \

    ; \

    rm -rf /var/lib/apt/lists/*; \

    \

    wget -O redis.tar.gz "$REDIS_DOWNLOAD_URL"; \

    echo "$REDIS_DOWNLOAD_SHA *redis.tar.gz" | sha256sum -c -; \

    mkdir -p /usr/src/redis; \

    tar -xzf redis.tar.gz -C /usr/src/redis --strip-components=1; \

    rm redis.tar.gz; \

    \

# disable Redis protected mode [1] as it is unnecessary in context of Docker

# (ports are not automatically exposed when running inside Docker, but rather explicitly by specifying -p / -P)

# [1]: https://github.com/redis/redis/commit/edd4d555df57dc84265fdfb4ef59a4678832f6da

    grep -E '^ *createBoolConfig[(]"protected-mode",.*, *1 *,.*[)],$' /usr/src/redis/src/config.c; \

    sed -ri 's!^( *createBoolConfig[(]"protected-mode",.*, *)1( *,.*[)],)$!\10\2!' /usr/src/redis/src/config.c; \

    grep -E '^ *createBoolConfig[(]"protected-mode",.*, *0 *,.*[)],$' /usr/src/redis/src/config.c; \

# for future reference, we modify this directly in the source instead of just supplying a default configuration flag because apparently "if you specify any argument to redis-server, [it assumes] you are going to specify everything"

# see also https://github.com/docker-library/redis/issues/4#issuecomment-50780840

# (more exactly, this makes sure the default behavior of "save on SIGTERM" stays functional by default)

    \

# https://github.com/jemalloc/jemalloc/issues/467 -- we need to patch the "./configure" for the bundled jemalloc to match how Debian compiles, for compatibility

# (also, we do cross-builds, so we need to embed the appropriate "--build=xxx" values to that "./configure" invocation)

    gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)"; \

    extraJemallocConfigureFlags="--build=$gnuArch"; \

# https://salsa.debian.org/debian/jemalloc/-/blob/c0a88c37a551be7d12e4863435365c9a6a51525f/debian/rules#L8-23

    dpkgArch="$(dpkg --print-architecture)"; \

    case "${dpkgArch##*-}" in \

        amd64 | i386 | x32) extraJemallocConfigureFlags="$extraJemallocConfigureFlags --with-lg-page=12" ;; \

        *) extraJemallocConfigureFlags="$extraJemallocConfigureFlags --with-lg-page=16" ;; \

    esac; \

    extraJemallocConfigureFlags="$extraJemallocConfigureFlags --with-lg-hugepage=21"; \

    grep -F 'cd jemalloc && ./configure ' /usr/src/redis/deps/Makefile; \

    sed -ri 's!cd jemalloc && ./configure !&'"$extraJemallocConfigureFlags"' !' /usr/src/redis/deps/Makefile; \

    grep -F "cd jemalloc && ./configure $extraJemallocConfigureFlags " /usr/src/redis/deps/Makefile; \

    \

    export BUILD_TLS=yes; \

    make -C /usr/src/redis -j "$(nproc)" all; \

    make -C /usr/src/redis install; \

    \

# TODO https://github.com/redis/redis/pull/3494 (deduplicate "redis-server" copies)

    serverMd5="$(md5sum /usr/local/bin/redis-server | cut -d' ' -f1)"; export serverMd5; \

    find /usr/local/bin/redis* -maxdepth 0 \

        -type f -not -name redis-server \

        -exec sh -eux -c ' \

            md5="$(md5sum "$1" | cut -d" " -f1)"; \

            test "$md5" = "$serverMd5"; \

        ' -- '{}' ';' \

        -exec ln -svfT 'redis-server' '{}' ';' \

    ; \

    \

    rm -r /usr/src/redis; \

    \

    apt-mark auto '.*' > /dev/null; \

    [ -z "$savedAptMark" ] || apt-mark manual $savedAptMark > /dev/null; \

    find /usr/local -type f -executable -exec ldd '{}' ';' \

        | awk '/=>/ { print $(NF-1) }' \

        | sort -u \

        | xargs -r dpkg-query --search \

        | cut -d: -f1 \

        | sort -u \

        | xargs -r apt-mark manual \

    ; \

    apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \

    \

    redis-cli --version; \

    redis-server --version

RUN mkdir /data && chown redis:redis /data

VOLUME /data

WORKDIR /data

COPY docker-entrypoint.sh /usr/local/bin/

ENTRYPOINT ["docker-entrypoint.sh"]

EXPOSE 6379

CMD ["redis-server"]