small Alpine Linux install with Docker as next step toward replacing boot2docker

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

alpine/Dockerfile

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+FROM alpine:edge
+
+MAINTAINER Justin Cormack <justin.cormack@unikernel.com>
+
+COPY repositories /etc/apk/repositories
+COPY motd hostname /etc/
+
+RUN apk update && apk upgrade && apk add e2fsprogs docker
+RUN apk add cpio
+CMD ["/bin/sh"]

alpine/Makefile

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+all:	initrd.img
+
+initrd.img: Dockerfile hostname repositories motd
+	rm -f initrd.img
+	docker build -t moby:test .
+	docker run -i -v $(PWD):/export moby:test /export/mkinitrd.sh
+
+clean:
+	rm -f initrd.img

alpine/hostname

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+docker

alpine/mkinitrd.sh

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+#!/bin/sh
+
+find / -xdev | cpio -H newc -o > /export/initrd.img

alpine/motd

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+                        ##         .
+                  ## ## ##        ==
+               ## ## ## ## ##    ===
+           /"""""""""""""""""\___/ ===
+      ~~~ {~~ ~~~~ ~~~ ~~~~ ~~~ ~ /  ===- ~~~
+           \______ o           __/
+             \    \         __/
+              \____\_______/

alpine/repositories

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+http://dl-4.alpinelinux.org/alpine/edge/main
+http://dl-4.alpinelinux.org/alpine/edge/community
+http://dl-4.alpinelinux.org/alpine/edge/testing