Dockerfile

FROM golang:1.7-alpine

RUN apk add --no-cache ca-certificates file openssl

ENV RUNC_VERSION v0.1.0

RUN mkdir -p /go/src/github.com/opencontainers \
	&& wget -O- "https://github.com/opencontainers/runc/archive/${RUNC_VERSION}.tar.gz" \
		| tar -xzC /go/src/github.com/opencontainers \
	&& mv "/go/src/github.com/opencontainers/runc-${RUNC_VERSION#v}" /go/src/github.com/opencontainers/runc

ENV GOPATH $GOPATH:/go/src/github.com/opencontainers/runc/Godeps/_workspace

# disable CGO for ALL THE THINGS (to help ensure no libc)
ENV CGO_ENABLED 0

ENV BUILD_FLAGS="-v -ldflags '-d -s -w'"

COPY *.go /go/src/github.com/tianon/gosu/
WORKDIR /go/src/github.com/tianon/gosu

# gosu-$(dpkg --print-architecture)
RUN set -x \
	&& eval "GOARCH=amd64 go build $BUILD_FLAGS -o /go/bin/gosu-amd64" \
	&& file /go/bin/gosu-amd64 \
	&& { /go/bin/gosu-amd64 || true; } \
	&& /go/bin/gosu-amd64 nobody id \
	&& /go/bin/gosu-amd64 nobody ls -l /proc/self/fd
RUN set -x \
	&& eval "GOARCH=386 go build $BUILD_FLAGS -o /go/bin/gosu-i386" \
	&& file /go/bin/gosu-i386 \
	&& /go/bin/gosu-i386 nobody id \
	&& /go/bin/gosu-i386 nobody ls -l /proc/self/fd
RUN set -x \
	&& eval "GOARCH=arm GOARM=5 go build $BUILD_FLAGS -o /go/bin/gosu-armel" \
	&& file /go/bin/gosu-armel
RUN set -x \
	&& eval "GOARCH=arm GOARM=6 go build $BUILD_FLAGS -o /go/bin/gosu-armhf" \
	&& file /go/bin/gosu-armhf
# boo Raspberry Pi, making life hard
#RUN set -x \
#	&& eval "GOARCH=arm GOARM=7 go build $BUILD_FLAGS -o /go/bin/gosu-armhf" \
#	&& file /go/bin/gosu-armhf
RUN set -x \
	&& eval "GOARCH=arm64 go build $BUILD_FLAGS -o /go/bin/gosu-arm64" \
	&& file /go/bin/gosu-arm64
RUN set -x \
	&& eval "GOARCH=ppc64 go build $BUILD_FLAGS -o /go/bin/gosu-ppc64" \
	&& file /go/bin/gosu-ppc64
RUN set -x \
	&& eval "GOARCH=ppc64le go build $BUILD_FLAGS -o /go/bin/gosu-ppc64el" \
	&& file /go/bin/gosu-ppc64el
RUN set -x \
	&& eval "GOARCH=s390x go build $BUILD_FLAGS -o /go/bin/gosu-s390x" \
	&& file /go/bin/gosu-s390x

RUN file /go/bin/gosu-*