Dockerfile to backport shorewall-5.2.3.4 from Ubuntu 20.04 to Ubuntu 18.04

Dockerfile

FROM ubuntu:18.04

RUN apt-get update && \
        DEBIAN_FRONTEND=noninteractiv apt-get install -y dpkg-dev devscripts

RUN sh -c "echo deb-src http://archive.ubuntu.com/ubuntu/ focal universe >> /etc/apt/sources.list"

RUN apt-get update && apt-get build-dep -y shorewall

WORKDIR /root  

RUN apt-get source shorewall shorewall-core         

## shorewall

# Add the backport note to the package version
RUN cd /root/shorewall-5.2.3.4 && dch --bpo "DataHub backport"

# Build package
RUN cd /root/shorewall-5.2.3.4 && dpkg-buildpackage -rfakeroot -uc -b

## shorewall-core

# Add the backport note to the package version
RUN cd /root/shorewall-core-5.2.3.4 && dch --bpo "DataHub backport"

# Build package
RUN cd /root/shorewall-core-5.2.3.4 && dpkg-buildpackage -rfakeroot -uc -b

run.sh

docker build . --tag shorewall-build

docker run --rm --entrypoint cat shorewall-build /root/shorewall-core_5.2.3.4-1~bpo9+1_all.deb > shorewall-core_5.2.3.4-1~bpo9+1_all.deb
docker run --rm --entrypoint cat shorewall-build /root/shorewall_5.2.3.4-1~bpo9+1_all.deb > shorewall_5.2.3.4-1~bpo9+1_all.deb