update Dockerfile

Dockerfile

@@ -1,43 +1,31 @@
-# tmate-ssh-server, see https://tmate.io/
+FROM alpine:3.9
-#
-# Example usage:
-#
-#     docker run --privileged --rm -i -p 22:22 \
-#     -v /etc/tmate/keys:/daemon-keys \
-#     -v /etc/tmate/authorized_keys:/authorized-keys \
-#     varac/tmate-ssh-server \
-#     /bin/sh -c "/sbin/tmate-ssh-server -k /daemon-keys -a /authorized-keys -b 0.0.0.0 -p 22 -v -v -v -h SERVER_FQDN"
 
-FROM debian:jessie-slim
+RUN apk add --no-cache msgpack-c ncurses-libs libevent libexecinfo libressl zlib
 
-# Locales
+RUN set -ex; \
-RUN mkdir -p /usr/share/locale/locale.alias && ln -s /etc/locale.alias /usr/share/locale/locale.alias
+	apk add --no-cache --virtual .build-deps \
-RUN apt-get update && apt-get install -y locales \
+		git wget cmake make gcc g++ linux-headers zlib-dev libressl-dev \
-    && localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
+		automake autoconf libevent-dev ncurses-dev msgpack-c-dev libexecinfo-dev; \
-ENV LANG en_US.utf8
+	\
+	mkdir -p /src/libssh/build; \
+	cd /src; \
+	wget -O libssh.tar.xz https://www.libssh.org/files/0.8/libssh-0.8.7.tar.xz; \
+	tar -xf libssh.tar.xz -C /src/libssh --strip-components=1; \
+	cd /src/libssh/build; \
+	cmake -DCMAKE_INSTALL_PREFIX:PATH=/usr -DWITH_SFTP=OFF ..; \
+	make -j "$(nproc)"; \
+	make install ;\
+	\
+	mkdir -p /src/; \
+	cd /src/; \
+	git clone https://github.com/tmate-io/tmate-ssh-server.git; \
+	cd tmate-ssh-server; \
+	./autogen.sh; \
+	./configure --prefix=/usr CFLAGS="-D_GNU_SOURCE"; \
+	make -j "$(nproc)"; \
+	make install ;\
+	rm -rf /src; \
+	apk del .build-deps
 
-RUN apt-get install -y git build-essential automake cmake pkg-config libssl-dev zlib1g-dev libevent-dev libncurses5-dev \
+EXPOSE 22
-	&& rm -rf /var/lib/apt/lists/*
+ENTRYPOINT ["tmate-ssh-server"]
-
-RUN mkdir /src && cd /src/ &&\
-        # Latest libssh requires cmake >= 3.3.0 which is not available in jessie.
-	# jessie-backports provides 3.6.2 but this pulls too many dependencies in.
-	git clone -b libssh-0.7.6 git://git.libssh.org/projects/libssh.git &&\
-	git clone https://github.com/msgpack/msgpack-c.git &&\
-	git clone https://github.com/tmate-io/tmate-ssh-server.git
-
-RUN cd /src/libssh &&\
-	mkdir build && cd build && cmake .. && make install
-RUN cd /src/msgpack-c &&\
-	mkdir build && cd build && cmake .. && make install
-
-RUN cd /src/tmate-ssh-server &&\
-	sh autogen.sh && PKG_CONFIG_PATH=/usr/local/lib/pkgconfig ./configure && make
-
-RUN cp /src/tmate-ssh-server/tmate-ssh-server /sbin/
-
-# Clean up
-RUN rm -rf /src
-RUN apt-get --auto-remove purge -y git build-essential automake cmake pkg-config libssl-dev zlib1g-dev libncurses5-dev
-
-ENV LD_LIBRARY_PATH=/usr/local/lib