This project is only at the proof-of-concept state yet
The goal of this project is to easily generate a Dockerfile from an existing Docker image.
To build the image from source (this step is not mandatory as the image also is on the Docker Hub):
git clone https://github.com/lukapeschke/dockerfile-from-image.git
cd dockerfile-from-image
docker build -t lukapeschke/dfa .
To get a Dockerfile from an existing image:
# linux
docker run --rm -v '/var/run/docker.sock:/var/run/docker.sock' lukapeschke/dfa <IMAGE_ID>
# windows
docker run --rm -v '//var/run/docker.sock:/var/run/docker.sock' lukapeschke/dfa <IMAGE_ID>
$ docker images
REPOSITORY TAG IMAGE ID CREATED
ubuntu latest c73a085dc378 12 days ago
$ docker run --rm -v '/var/run/docker.sock:/var/run/docker.sock' lukapeschke/dfa c73a085dc378
FROM ubuntu:latest
ADD file:cd937b840fff16e04e1f59d56f4424d08544b0bb8ac30d9804d25e28fb15ded3 in /
RUN /bin/sh -c set -xe \
&& echo '#!/bin/sh' > /usr/sbin/policy-rc.d \
&& echo 'exit 101' >> /usr/sbin/policy-rc.d \
&& chmod +x /usr/sbin/policy-rc.d \
&& dpkg-divert --local --rename --add /sbin/initctl \
&& cp -a /usr/sbin/policy-rc.d /sbin/initctl \
&& sed -i 's/^exit.*/exit 0/' /sbin/initctl \
&& echo 'force-unsafe-io' > /etc/dpkg/dpkg.cfg.d/docker-apt-speedup \
&& echo 'DPkg::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' > /etc/apt/apt.conf.d/docker-clean \
&& echo 'APT::Update::Post-Invoke { "rm -f /var/cache/apt/archives/*.deb /var/cache/apt/archives/partial/*.deb /var/cache/apt/*.bin || true"; };' >> /etc/apt/apt.conf.d/docker-clean \
&& echo 'Dir::Cache::pkgcache ""; Dir::Cache::srcpkgcache "";' >> /etc/apt/apt.conf.d/docker-clean \
&& echo 'Acquire::Languages "none";' > /etc/apt/apt.conf.d/docker-no-languages \
&& echo 'Acquire::GzipIndexes "true"; Acquire::CompressionTypes::Order:: "gz";' > /etc/apt/apt.conf.d/docker-gzip-indexes \
&& echo 'Apt::AutoRemove::SuggestsImportant "false";' > /etc/apt/apt.conf.d/docker-autoremove-suggests
RUN /bin/sh -c rm -rf /var/lib/apt/lists/*
RUN /bin/sh -c sed -i 's/^#\s*\(deb.*universe\)$/\1/g' /etc/apt/sources.list
RUN /bin/sh -c mkdir -p /run/systemd \
&& echo 'docker' > /run/systemd/container
CMD ["/bin/bash"]