Move custom images out of contrib

images/ubuntu-slim/Dockerfile

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+FROM scratch
+
+ADD rootfs.tar /
+
+CMD ["/bin/bash"]

images/ubuntu-slim/Dockerfile.build

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+FROM ubuntu:16.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+COPY excludes /etc/dpkg/dpkg.cfg.d/excludes
+
+RUN apt-get update \
+    && apt-get dist-upgrade -y
+
+COPY runlevel /sbin/runlevel
+
+# hold required packages to avoid breaking the installation of packages
+RUN apt-mark hold apt gnupg adduser passwd libsemanage1
+
+# dpkg --get-selections | grep -v deinstall
+RUN echo "Yes, do as I say!" | apt-get purge \
+    libcap2-bin \
+    libkmod2 \
+    libsmartcols1 \
+    libudev1 \
+    tzdata
+
+# cleanup
+RUN apt-get autoremove -y && \
+    apt-get clean -y && \
+    tar -czf /usr/share/copyrights.tar.gz /usr/share/common-licenses /usr/share/doc/*/copyright && \
+    rm -rf \
+        /usr/share/doc \
+        /usr/share/man \
+        /usr/share/info \
+        /usr/share/locale \
+        /var/lib/apt/lists/* \
+        /var/log/* \
+        /var/cache/debconf/* \
+        /usr/share/common-licenses* \
+        ~/.bashrc \
+        /etc/systemd \
+        /lib/lsb \
+        /lib/udev \
+        /usr/lib/x86_64-linux-gnu/gconv/IBM* \
+        /usr/lib/x86_64-linux-gnu/gconv/EBC* && \
+    mkdir -p /usr/share/man/man1 /usr/share/man/man2 \
+        /usr/share/man/man3 /usr/share/man/man4 \
+        /usr/share/man/man5 /usr/share/man/man6 \
+        /usr/share/man/man7 /usr/share/man/man8

images/ubuntu-slim/Makefile

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+all: push
+
+TAG ?= 0.6
+PREFIX ?= gcr.io/google_containers/ubuntu-slim
+BUILD_IMAGE ?= ubuntu-build
+TAR_FILE ?= rootfs.tar
+
+container: clean
+	docker build --pull -t $(BUILD_IMAGE) -f Dockerfile.build .
+	docker create --name $(BUILD_IMAGE) $(BUILD_IMAGE)
+	docker export $(BUILD_IMAGE) > $(TAR_FILE)
+	docker build --pull -t $(PREFIX):$(TAG) .
+
+push: container
+	docker push $(PREFIX):$(TAG)
+
+clean:
+	docker rmi -f $(PREFIX):$(TAG) || true
+	docker rmi -f $(BUILD_IMAGE)   || true
+	docker rm  -f $(BUILD_IMAGE)   || true
+	rm -f $(TAR_FILE)

images/ubuntu-slim/README.md

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+
+Small Ubuntu 16.04 docker image
+
+The size of this image is ~56MB (less than half than `ubuntu:16.04).
+This is possible by the removal of packages that are not required in a container:
+- dmsetup
+- e2fsprogs
+- init
+- initscripts
+- libcap2-bin
+- libcryptsetup4
+- libdevmapper1.02.1
+- libkmod2
+- libsmartcols1
+- libudev1
+- mount
+- procps
+- systemd
+- systemd-sysv
+- tzdata
+- udev
+- util-linux

images/ubuntu-slim/excludes

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+path-exclude /usr/share/doc/*
+path-include /usr/share/doc/*/copyright
+path-exclude /usr/share/man/*
+path-exclude /usr/share/groff/*
+path-exclude /usr/share/info/*
+path-exclude /usr/share/locale/*
+path-include /usr/share/locale/en_US*
+path-include /usr/share/locale/locale.alias
+path-exclude /usr/share/i18n/locales/*
+path-include /usr/share/i18n/locales/en_US*

images/ubuntu-slim/runlevel

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+#!/bin/sh
+
+exit 0