FROM alpine:3.12.1

ARG SSH_USER="hub"
ARG UID="1001"

ENV SSH_USER ${SSH_USER}

# secrets:
# - host_ssh_key
# - authorized_keys

USER root
RUN apk update &&\
	apk upgrade &&\
	apk add openssh &&\
	mkdir /var/run/sshd &&\
	mkdir -p /etc/ssh &&\
	ln -s /run/secrets/host_ssh_key /etc/ssh/ssh_host_key &&\
	echo 'root:nonvisibleroot' | chpasswd &&\
	addgroup --gid $UID -S $SSH_USER &&\
	adduser \
		-S -G $SSH_USER \
		--uid $UID \
		--shell /bin/sh \
		--home /home/$SSH_USER \
		$SSH_USER &&\
	echo 'hub:nonvisiblehub' | chpasswd &&\
	mkdir         "/home/$SSH_USER/.ssh" &&\
	chown "$SSH_USER" "/home/$SSH_USER/.ssh"  &&\
	chmod 700         "/home/$SSH_USER/.ssh"

COPY sshd_config /etc/ssh/sshd_config
ADD start.sh /

EXPOSE 22
CMD ["sh", "/start.sh"]