updates and cleanups

Signed-off-by: Jess Frazelle <jess@mesosphere.com>

gitserver/Dockerfile

@@ -0,0 +1,34 @@
+# Run a git server in a container.
+#
+# docker run --rm -it -p 1234:22 \
+# 	-e DEBUG=true \
+# 	-e "PUBKEY=$(cat ~/.ssh/id_ed25519.pub)" \
+# 	--name gitserver \
+# 	jess/gitserver
+FROM alpine:latest
+MAINTAINER Jessica Frazelle <jess@docker.com>
+
+ENV HOME /root
+
+RUN apk update && apk add \
+	git \
+	openssh \
+	&& rm -rf /var/cache/apk/* \
+	&& sed -i "s/#PasswordAuthentication yes/PasswordAuthentication no/" /etc/ssh/sshd_config \
+	&& sed -i "s/#PubkeyAuthentication yes/PubkeyAuthentication yes/" /etc/ssh/sshd_config \
+	&& echo -e "AllowUsers git\n" >> /etc/ssh/sshd_config \
+	&& echo -e "Port 22\n" >> /etc/ssh/sshd_config \
+	&& addgroup git \
+	&& adduser -D -S -s /usr/bin/git-shell -h /home/git -g git git \
+	&& mkdir -p /home/git/.ssh \
+	&& chown -R git:git /home/git \
+	&& passwd -u git
+
+ENV HOME /home/git
+EXPOSE 22
+WORKDIR $HOME
+
+COPY ./start.sh /
+
+ENTRYPOINT ["/start.sh"]
+CMD ["/usr/sbin/sshd", "-D", "-e", "-f", "/etc/ssh/sshd_config"]