Dockerfile in KDL

Dockerfile.kdl

// This file is a translation of https://gitea.treehouse.systems/treehouse/mastodon/src/branch/main/Dockerfile to KDL

// This needs to be bookworm-slim because the Ruby image is built on bookworm-slim
ARG NODE_IMAGE="node:20.8-bookworm-slim"
ARG RUBY_IMAGE="ghcr.io/moritzheiber/ruby-jemalloc:3.2.2-slim"

// hadolint ignore=DL3006
FROM "${RUBY_IMAGE}" as="ruby"

// build-base
// hadolint ignore=DL3006
FROM "${NODE_IMAGE}" as="build-base"

COPY --link=true --from="ruby" "/opt/ruby" "/opt/ruby"

ENV DEBIAN_FRONTEND="noninteractive" \
    PATH="${PATH}:/opt/ruby/bin"

SHELL "/bin/bash" "-o" "pipefail" "-c"

WORKDIR "/opt/mastodon"

// hadolint ignore=DL3008,DL3009
RUN --mount="type=cache,id=apt,target=/var/cache/apt,sharing=private" \
    // This relies on `RUN` passing the command to the shell in such a way
    // that the shell itself interprets the `\`. You could also skip the `&& \` nonsense altogether and
    // place each command in its own line and expect the interpreter to handle it like a script.
    r#"set -eux && \
    rm -f /etc/apt/apt.conf.d/docker-clean && \
    echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache && \
    apt-get update && \
    apt-get -yq dist-upgrade && \
    apt-get install -y --no-install-recommends \
        build-essential \
        ca-certificates \
        git \
        libgdbm-dev \
        libgmp-dev \
        libicu-dev \
        libidn-dev \
        libjemalloc-dev \
        libpq-dev \
        libreadline8 \
        libssl-dev \
        libyaml-dev \
        python3 \
        shared-mime-info \
        zlib1g-dev"#

COPY --link=true ".yarn/releases/" "/opt/mastodon/.yarn/releases/"
COPY --link=true "Gemfile*" "package.json" "yarn.lock" ".yarnrc.yml" "/opt/mastodon/"

ENV NODE_OPTIONS="--openssl-legacy-provider" \
    YARN_GLOBAL_FOLDER="/opt/yarn" \
    YARN_ENABLE_GLOBAL_CACHE=1

// hadolint ignore=DL3060
RUN --mount="type=cache,id=bundle,target=/opt/bundle/cache,sharing=private" \
    --mount="type=cache,id=yarn,target=/opt/yarn/cache,sharing=private" \
    r#"set -eux && \
    bundle config set cache_path /opt/bundle/cache && \
    bundle config set silence_root_warning 'true' && \
    bundle cache --no-install && \
    bundle config set --local deployment true && \
    bundle install --local -j"$(nproc)" && \
    yarn install --immutable"#

// Precompile assets
// TODO(kouhai): we're currently patching node_modules because of emoji-mart.
// we should integrate our own fork instead.
COPY --link=true "." "/opt/mastodon"

// build
FROM "build-base" as="build"

ENV RAILS_ENV="production" \
    NODE_ENV="production"

ENV NODE_OPTIONS="--openssl-legacy-provider" \
    YARN_GLOBAL_FOLDER="/opt/yarn" \
    YARN_ENABLE_GLOBAL_CACHE=1

ENV OTP_SECRET="precompile_placeholder" \
    SECRET_KEY_BASE="precompile_placeholder" \
    RAKE_NO_YARN_INSTALL_HACK=1

// override this at will
ENV BOOTSNAP_READONLY=1

RUN --mount="type=cache,id=yarn,target=/opt/yarn/cache,sharing=private" \
    --mount="type=cache,id=webpacker,target=/opt/webpacker/cache,sharing=private" \
    r#"set -eux && \
    mkdir -p tmp/cache && \
    ln -sf /opt/webpacker/cache tmp/cache/webpacker && \
    mv ./emoji_data/all.json ./node_modules/emoji-mart/data/all.json && \
    yarn install && \
    bundle exec rails assets:precompile"#

// final image
// hadolint ignore=DL3006
FROM "${NODE_IMAGE}" as="output-base"

ENV DEBIAN_FRONTEND="noninteractive"

// Ignoring these here since we don't want to pin any versions and the Debian image removes apt-get content after use
// hadolint ignore=DL3008,DL3009
RUN --mount="type=cache,id=apt,target=/var/cache/apt,sharing=private" \
    r#"set -eux && \
    rm -f /etc/apt/apt.conf.d/docker-clean && \
    echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache && \
    echo "Etc/UTC" > /etc/localtime && \
    apt-get update && \
    apt-get -y --no-install-recommends install \
        ca-certificates \
        ffmpeg \
        file \
        imagemagick \
        libicu72 \
        libidn12 \
        libjemalloc2 \
        libpq5 \
        libreadline8 \
        libssl3 \
        libyaml-0-2 \
        procps \
        tini \
        tzdata \
        wget \
        whois"#

// final image
FROM "output-base" as="output"

// Use those args to specify your own version flags & suffixes
ARG SOURCE_TAG=""
ARG MASTODON_VERSION_PRERELEASE=""
ARG MASTODON_VERSION_METADATA=""

ARG UID="991"
ARG GID="991"

SHELL "/bin/bash" "-o" "pipefail" "-c"

ENV PATH="${PATH}:/opt/ruby/bin:/opt/mastodon/bin"

// Ignoring these here since we don't want to pin any versions and the Debian image removes apt-get content after use
// hadolint ignore=DL3008,DL3009
RUN r#"groupadd -g "${GID}" mastodon && \
    useradd -l -u "${UID}" -g "${GID}" -m -d /opt/mastodon mastodon && \
    ln -s /opt/mastodon /mastodon"#

// Note: no, cleaning here since Debian does this automatically
// See the file /etc/apt/apt.conf.d/docker-clean within the Docker image's filesystem

COPY --link=true --from="ruby" "/opt/ruby" "/opt/ruby"
COPY --link=true --chown="mastodon:mastodon" --from="build" "/opt/mastodon" "/opt/mastodon"

ENV RAILS_ENV="production" \
    NODE_ENV="production" \
    RAILS_SERVE_STATIC_FILES="true" \
    BIND="0.0.0.0" \
    SOURCE_TAG="${SOURCE_TAG}" \
    MASTODON_VERSION_PRERELEASE="${MASTODON_VERSION_PRERELEASE}" \
    MASTODON_VERSION_METADATA="${MASTODON_VERSION_METADATA}"

// override this at will
ENV BOOTSNAP_READONLY=1

// Set the run user
USER "mastodon"
WORKDIR "/opt/mastodon"

// Set the work dir and the container entry point
ENTRYPOINT "/usr/bin/tini" "--"
EXPOSE 3000 4000