FROM xena/alpine

RUN apk add --no-cache ca-certificates

ENV GOLANG_VERSION 1.7.4
ENV GOLANG_SRC_URL https://golang.org/dl/go$GOLANG_VERSION.src.tar.gz
ENV GOLANG_SRC_SHA256 4c189111e9ba651a2bb3ee868aa881fab36b2f2da3409e80885ca758a6b614cc

# https://golang.org/issue/14851
COPY no-pic.patch /

RUN set -ex \
	&& apk add --no-cache --virtual go-build-deps \
		bash \
		gcc \
		musl-dev \
		openssl \
		go \
	\
	&& export GOROOT_BOOTSTRAP="$(go env GOROOT)" \
	\
	&& wget -q "$GOLANG_SRC_URL" -O golang.tar.gz \
	&& echo "$GOLANG_SRC_SHA256  golang.tar.gz" | sha256sum -c - \
	&& tar -C /usr/local -xzf golang.tar.gz \
	&& rm golang.tar.gz \
	&& cd /usr/local/go/src \
	&& patch -p2 -i /no-pic.patch \
	&& ./make.bash \
	\
	&& rm -rf /*.patch \
	&& apk del go-build-deps

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

RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && chmod -R 777 "$GOPATH"
WORKDIR $GOPATH

COPY go-wrapper /usr/local/bin/