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#!/bin/sh

# ./create-image openssh 7.3p1 openssl 1.0.2m

set -x

case $1 in
    openssh)
	FAMssh=openssh
	VERssh=$2
	PFX=https://ftp.eu.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-
	SFX=.tar.gz
	TMP=tmp.tar.gz
	;;
    *)
	echo "Unsupported: $1"
	exit
esac

FAMssl=$3
VERssl=$4

VER=${FAMssh}${VERssh}-${FAMssl}${VERssl}

# This way of fetching the tar-file separate from the docker commands makes
# http-proxy handling way easier. The wget command handles the $https_proxy
# variable while the docker command must have /etc/docker/something changed
# and the docker server restarted. That is not possible without root access.

# Make a Dockerfile. This method simplifies env variable handling considerably:
cat - > TempDockerFile <<EOF

    FROM  ssh_compat_suite-${FAMssl}:${VERssl}

    LABEL openssh-version=${VER}

    WORKDIR /buildroot

    COPY ${TMP} .
    RUN  tar xf ${TMP}

    # Build and install

    WORKDIR ${FAMssh}-${VERssh}

    # Probably VERY OpenSSH dependent...:
    RUN ./configure --without-pie \
                    --prefix=/buildroot/ssh \
                    --with-ssl-dir=/buildroot/ssl \
                    --with-pam \
                    LDFLAGS=-Wl,-R/buildroot/ssl/lib
    RUN  make
    RUN  make install
    RUN  echo UsePAM yes >> /buildroot/ssh/etc/sshd_config

    RUN echo Built ${VER}

    # Start the daemon, but keep it in foreground to avoid killing the container
    CMD /buildroot/ssh/sbin/sshd -D -p 1234

EOF

# Fetch the tar file. This could be done in an "ADD ..." in the Dockerfile,
# but then we hit the proxy problem...
wget -O $TMP $PFX$VERssh$SFX

# Build the image:
docker build -t  ssh_compat_suite-ssh:$VER -f ./TempDockerFile .

# Cleaning
rm -fr ./TempDockerFile $TMP