Refactor the dockerfile for Pixiecore.

The way docker hub and quay.io work, you can't easily pass a custom
context to a Dockerfile. So, effectively, if you want multiple dockerfiles
per repository, you need to re-check out the whole repository by hand,
without help from the environment.

This sucks a little bit because it doesn't guarantee that the build happens
at the trigger revision ID, but for my purposes of "just have a recent build up",
it's sufficient.

Makefile

@@ -1,8 +1,11 @@
-.PHONY: none pixiecore-docker
+.PHONY: none pixiecore pixiecore-git
 
 none:
 	@echo "Use glide and the go tool for development"
 	@echo "This makefile is just a shortcut for building docker containers."
 
-pixiecore-docker:
-	sudo docker build --rm -t danderson/pixiecore -f cmd/pixiecore/Dockerfile .
+pixiecore:
+	sudo docker build --rm -t danderson/pixiecore -f dockerfiles/pixiecore/Dockerfile .
+
+pixiecore-git:
+	sudo docker build --rm -t danderson/pixiecore dockerfiles/pixiecore

cmd/pixiecore/Dockerfile

@@ -1,21 +0,0 @@
-FROM alpine:edge
-MAINTAINER David Anderson <dave@natulte.net>
-
-COPY . /tmp/go/src/go.universe.tf/netboot
-RUN \
-  export GOPATH=/tmp/go &&\
-  echo "http://dl-4.alpinelinux.org/alpine/edge/community" >>/etc/apk/repositories &&\
-  apk -U add ca-certificates git go gcc musl-dev &&\
-  apk upgrade &&\
-  cd /tmp/go/src/go.universe.tf/netboot &&\
-  ls -l &&\
-  go get -v . &&\
-  cd cmd/pixiecore &&\
-  go build . &&\
-  cp pixiecore /pixiecore &&\
-  cd / &&\
-  rm -rf /tmp/go &&\
-  apk del git go gcc musl-dev &&\
-  rm -rf /var/cache/apk/*
-
-ENTRYPOINT ["/pixiecore"]

dockerfiles/pixiecore/Dockerfile

@@ -0,0 +1,7 @@
+FROM alpine:edge
+MAINTAINER David Anderson <dave@natulte.net>
+
+COPY . /tmp/stuff
+RUN cd /tmp/stuff; [ -f build.sh ] && ./build.sh || ./dockerfiles/pixiecore/build.sh
+
+ENTRYPOINT ["/pixiecore"]

dockerfiles/pixiecore/build.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+set -x
+set -e
+
+mkdir -p /tmp/go/src/go.universe.tf
+if [ -d /tmp/stuff/.git ]; then
+    echo "Building from local dev copy"
+    mkdir -p /tmp/go/src/go.universe.tf
+    cp -R /tmp/stuff /tmp/go/src/go.universe.tf/netboot
+else
+    echo "Building from git checkout"
+fi
+
+export GOPATH=/tmp/go
+echo "http://dl-4.alpinelinux.org/alpine/edge/community" >>/etc/apk/repositories
+apk -U add ca-certificates git go gcc musl-dev
+apk upgrade
+go get -v github.com/Masterminds/glide
+go get -v -d go.universe.tf/netboot/cmd/pixiecore
+cd /tmp/go/src/go.universe.tf/netboot
+/tmp/go/bin/glide install
+cd cmd/pixiecore
+go build .
+cp ./pixiecore /pixiecore
+cd /
+apk del git go gcc musl-dev
+rm -rf /tmp/go /tmp/stuff /root/.glide /usr/lib/go /var/cache/apk/*