FROM golang:1.12-alpine as builder
LABEL maintainer "Jessie Frazelle <jess@linux.com>"

ENV PATH /go/bin:/usr/local/go/bin:$PATH
ENV GOPATH /go

RUN apk --no-cache add \
	bash \
	ca-certificates \
	git \
	make

ENV COREDNS_VERSION v1.6.2

RUN git clone --depth 1 --branch ${COREDNS_VERSION} https://github.com/coredns/coredns /go/src/github.com/coredns/coredns

WORKDIR /go/src/github.com/coredns/coredns

RUN make all \
	&& mv coredns /usr/bin/coredns

FROM alpine:latest

COPY --from=builder /usr/bin/coredns /usr/bin/coredns
COPY --from=builder /etc/ssl/certs/ /etc/ssl/certs

ENTRYPOINT [ "coredns", "-log" ]