Move maintainer info to release stage, switch to LABEL instruction

This utilizes Docker multi-stage builds to produce a minimal Docker
image. Requires Docker 17.05.0.

Dockerfile

@@ -1,29 +1,27 @@
-FROM golang:1.8.0
+FROM golang:1.8.1 as builder
-
-MAINTAINER Pilosa Corp. <dev@pilosa.com>
 
 ARG ldflags=''
+ARG GLIDE="https://github.com/Masterminds/glide/releases/download/v0.12.3/glide-v0.12.3-linux-amd64.tar.gz"
+ARG GLIDE_HASH="d6d3816c70fba716466e7381a9c06cb31565a3b87acb5bad9dd3beb0a9f9b0f8"
+
+COPY . /go/src/github.com/pilosa/pilosa
+
+RUN wget ${GLIDE} -O /go/glide.tar.gz -q \
+    && tar xf /go/glide.tar.gz \
+    && mv /go/linux-amd64/glide /go/bin \
+    && [ "$(sha256sum /go/bin/glide | cut -d' ' -f1)" = "$GLIDE_HASH" ] \
+    && cd /go/src/github.com/pilosa/pilosa \
+    && make vendor \
+    && CGO_ENABLED=0 go install -a -ldflags "$ldflags" github.com/pilosa/pilosa/cmd/pilosa
+
+FROM scratch
+
+LABEL maintainer "dev@pilosa.com"
+
+COPY --from=builder /go/bin/pilosa /pilosa
 
 EXPOSE 10101
 VOLUME /data
 
-RUN echo 'data-dir = "/data"' > /config
+ENTRYPOINT ["/pilosa"]
-
+CMD ["server", "--data-dir", "/data"]
-RUN git clone --depth 1 https://github.com/Masterminds/glide.git /go/src/github.com/Masterminds/glide \
-    && cd /go/src/github.com/Masterminds/glide \
-    && git fetch --tags --depth 1 \
-    && git checkout tags/v0.12.3 -b build \
-    && make build \
-    && mv ./glide /go/bin \
-    && cd / \
-    && rm -r /go/src/github.com/Masterminds/glide
-
-COPY . /go/src/github.com/pilosa/pilosa
-
-RUN cd /go/src/github.com/pilosa/pilosa \
-    && make vendor \
-    && CGO_ENABLED=0 go install -a -ldflags "$ldflags" github.com/pilosa/pilosa/cmd/pilosa \
-    && rm -rf /go/src /go/pkg
-
-ENTRYPOINT ["/go/bin/pilosa"]
-CMD ["server", "--config", "/config"]

Makefile

@@ -62,5 +62,6 @@ endif
 
 docker:
 	docker build -t "pilosa:$(VERSION)" \
-		--build-arg ldflags="-X main.Version=$(VERSION) -X main.BuildTime=$(BUILD_TIME)" .
+		--build-arg ldflags="-X github.com/pilosa/pilosa/cmd.Version=$(VERSION) \
+		-X github.com/pilosa/pilosa/cmd.BuildTime=$(BUILD_TIME)" .
 	@echo "Created image: pilosa:$(VERSION)"