Initial BusyBox-upstream-based tarmaker

Dockerfile

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+FROM scratch
+ADD busybox.tar /bin
+CMD ["sh"]

builder/Dockerfile

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+FROM debian:jessie
+
+RUN apt-get update && apt-get install -y \
+		bzip2 \
+		curl \
+		gcc \
+		make \
+	&& rm -rf /var/lib/apt/lists/*
+
+RUN gpg --keyserver pool.sks-keyservers.net --recv-keys C9E9416F76E610DBD09D040F47B70C55ACC9965B
+
+WORKDIR /usr/src/busybox
+
+ENV BUSYBOX_VERSION 1.23.1
+
+RUN set -x \
+	&& curl -sSL "http://busybox.net/downloads/busybox-${BUSYBOX_VERSION}.tar.bz2" -o busybox.tar.bz2 \
+	&& curl -sSL "http://busybox.net/downloads/busybox-${BUSYBOX_VERSION}.tar.bz2.sign" -o busybox.tar.bz2.sign \
+	&& gpg --verify busybox.tar.bz2.sign \
+	&& tar -xf busybox.tar.bz2 --strip-components 1 \
+	&& rm busybox.tar.bz2*
+
+RUN set -x \
+	&& make defconfig \
+	&& echo 'CONFIG_STATIC=y' >> .config
+
+RUN set -x \
+	&& make -j$(nproc) \
+	&& mkdir -p rootfs-bin \
+	&& ln busybox rootfs-bin/ \
+	&& rootfs-bin/busybox --install rootfs-bin
+
+CMD ["./busybox"]

make.sh

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+#!/bin/bash
+set -e
+
+cd "$(readlink -f "$(dirname "$BASH_SOURCE")")"
+
+set -x
+docker build -t busybox:builder builder
+docker run --rm busybox:builder tar cC rootfs-bin . > busybox.tar
+docker build -t busybox .