FROM docker.io/alpine:3.18.2 ARG BORGBACKUP_PACKAGE_VERSION=1.2.4-r4 ARG OPENSSH_SERVER_PACKAGE_VERSION=9.3_p1-r3 ARG TINI_PACKAGE_VERSION=0.19.0-r1 ARG USER=borg ENV SSHD_HOST_KEYS_DIR=/etc/ssh/host_keys ENV REPO_PATH=/repository RUN apk add --no-cache \ borgbackup="$BORGBACKUP_PACKAGE_VERSION" \ openssh-server="$OPENSSH_SERVER_PACKAGE_VERSION" \ tini=$TINI_PACKAGE_VERSION \ && adduser -S -s /bin/ash "$USER" \ && mkdir "$SSHD_HOST_KEYS_DIR" \ && chown -c "$USER" "$SSHD_HOST_KEYS_DIR" \ && mkdir "$REPO_PATH" \ && chown -c "$USER" "$REPO_PATH" VOLUME $SSHD_HOST_KEYS_DIR VOLUME $REPO_PATH COPY sshd_config /etc/ssh/sshd_config EXPOSE 2200/tcp ENV SSH_CLIENT_PUBLIC_KEYS= ENV SSH_CLIENT_PUBLIC_KEYS_APPEND_ONLY= COPY entrypoint.sh / ENTRYPOINT ["/sbin/tini", "--", "/entrypoint.sh"] USER $USER CMD ["/usr/sbin/sshd", "-D", "-e"] # https://github.com/opencontainers/image-spec/blob/v1.0.1/annotations.md ARG REVISION= LABEL org.opencontainers.image.title="single-user openssh server restricted to borgbackup backend" \ org.opencontainers.image.source="https://github.com/fphammerle/docker-borgbackup-sshd" \ org.opencontainers.image.revision="$REVISION"