Dockerfile

FROM ubuntu:noble-20241015

# set default input arguments
ARG TARGETPLATFORM
ARG LANGUAGE=en_US
ARG ENCODING=UTF-8
ARG S6_OVERLAY_VERSION=3.2.0.2

# set default shell
SHELL ["/bin/bash", "-o", "pipefail", "-c"]

# set environment variables
ENV HOME=/root \
    TERM=xterm \
    LANG="${LANGUAGE}.${ENCODING}" \
    S6_CMD_WAIT_FOR_SERVICES=1 \
    S6_CMD_WAIT_FOR_SERVICES_MAXTIME=0 \
    S6_BEHAVIOUR_IF_STAGE2_FAILS=2

# set up packages, locale and non-root user
RUN export DEBIAN_FRONTEND=noninteractive && \
    echo '###### Set up packages' && \
    apt-get update && \
    apt-get upgrade -y && \
    apt-get install --no-install-recommends --no-install-suggests -y \
      apt-utils \
      ca-certificates \
      curl \
      locales \
      tzdata \
      xz-utils && \
    echo '###### Set up locale' && \
    localedef \
      -i "${LANGUAGE}" -c -f "${ENCODING}" \
      -A /usr/share/locale/locale.alias \
      "${LANG}" && \
    echo '###### Set up user' && \
    mkdir /config && \
    useradd -U -d /config -s /bin/false primary-user && \
    usermod -a -G users primary-user && \
    echo '###### Set up s6 overlay' && \
    PLATFORM_TRANSFORM='s/^linux\///' && \
    PLATFORM_TRANSFORM="${PLATFORM_TRANSFORM};s/^amd64/x86_64/" && \
    PLATFORM_TRANSFORM="${PLATFORM_TRANSFORM};s/^arm64/aarch64/" && \
    PLATFORM_TRANSFORM="${PLATFORM_TRANSFORM};s/^arm\/v7/armhf/" && \
    PLATFORM_TRANSFORM="${PLATFORM_TRANSFORM};s/^ppc64le/powerpc64le/" && \
    ARCH=$(echo "${TARGETPLATFORM}" | sed "${PLATFORM_TRANSFORM}") && \
    echo "###### Platform mapping s6 overlay: ${TARGETPLATFORM} => ${ARCH}" && \
    URL=https://github.com/just-containers/s6-overlay/releases/download && \
    URL="${URL}/v${S6_OVERLAY_VERSION}" && \
    curl -sSfo /tmp/s6-overlay-noarch.tar.xz \
      -L "${URL}/s6-overlay-noarch.tar.xz" && \
    curl -sSfo /tmp/s6-overlay-arch.tar.xz \
      -L "${URL}/s6-overlay-${ARCH}.tar.xz" && \
    curl -sSfo /tmp/s6-overlay-symlinks-noarch.tar.xz \
      -L "${URL}/s6-overlay-symlinks-noarch.tar.xz" && \
    curl -sSfo /tmp/s6-overlay-symlinks-arch.tar.xz \
      -L "${URL}/s6-overlay-symlinks-arch.tar.xz" && \
    curl -sSfo /tmp/syslogd-overlay-noarch.tar.xz \
      -L "${URL}/syslogd-overlay-noarch.tar.xz" && \
    tar -C / -Jxpf /tmp/s6-overlay-noarch.tar.xz && \
    tar -C / -Jxpf /tmp/s6-overlay-arch.tar.xz && \
    tar -C / -Jxpf /tmp/s6-overlay-symlinks-noarch.tar.xz && \
    tar -C / -Jxpf /tmp/s6-overlay-symlinks-arch.tar.xz && \
    tar -C / -Jxpf /tmp/syslogd-overlay-noarch.tar.xz && \
    echo '###### Clean up' && \
    apt-get autoremove --purge -y ca-certificates curl xz-utils && \
    apt-get autoremove --purge -y && \
    apt-get autoclean && \
    apt-get clean && \
    rm -rf \
      /var/lib/apt/lists/* \
      /var/tmp/* \
      /var/log/* \
      /tmp/*

# add local files
COPY root/ /

# entry (s6 overlays)
ENTRYPOINT ["/init"]

# set up config volume
VOLUME /config

# buildtime related arguments
ARG BUILD_DATETIME
ARG BUILD_REVISION
ARG BUILD_VERSION

# labels
LABEL maintainer=devpow112
LABEL org.opencontainers.image.authors=devpow112
LABEL org.opencontainers.image.title='Docker Ubuntu (Base)'
LABEL org.opencontainers.image.description='Ubuntu docker container for use as base for other containers.'
LABEL org.opencontainers.image.documentation=https://github.com/devpow112/docker-base-ubuntu#readme
LABEL org.opencontainers.image.licenses=MIT
LABEL org.opencontainers.image.source=https://github.com/devpow112/docker-base-ubuntu
LABEL org.opencontainers.image.url=https://github.com/devpow112/docker-base-ubuntu
LABEL org.opencontainers.image.vendor=devpow112
LABEL org.opencontainers.image.created=${BUILD_DATETIME}
LABEL org.opencontainers.image.revision=${BUILD_REVISION}
LABEL org.opencontainers.image.version=${BUILD_VERSION}