ARG BUILDPLATFORM=linux/amd64
ARG BUILD_STAGE=single-arch

# Precompile key slow-to-build dependencies
FROM --platform=$BUILDPLATFORM golang:1.14.2-alpine as go-deps
WORKDIR /linkerd-build
COPY go.mod go.sum ./
COPY bin/install-deps bin/
RUN go mod download
RUN ./bin/install-deps

## compile binaries
FROM go-deps as golang-single-arch
WORKDIR /linkerd-build
COPY cli cli
COPY charts charts
COPY jaeger jaeger

COPY controller/k8s controller/k8s
COPY controller/api controller/api
COPY controller/gen controller/gen
COPY pkg pkg
RUN mkdir -p /out

# Generate static templates
# TODO: `go generate` does not honor -mod=readonly
RUN go generate -mod=readonly ./pkg/charts/static
RUN go generate -mod=readonly ./jaeger/static

# Cache builds without version info
RUN CGO_ENABLED=0 GOOS=darwin go build -o /out/linkerd-darwin -tags prod -mod=readonly -ldflags "-s -w" ./cli
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /out/linkerd-linux-amd64 -tags prod -mod=readonly -ldflags "-s -w" ./cli
RUN CGO_ENABLED=0 GOOS=windows go build -o /out/linkerd-windows -tags prod -mod=readonly -ldflags "-s -w" ./cli

ARG LINKERD_VERSION
ENV GO_LDFLAGS="-s -w -X github.com/linkerd/linkerd2/pkg/version.Version=${LINKERD_VERSION}"
RUN CGO_ENABLED=0 GOOS=darwin go build -o /out/linkerd-darwin -tags prod -mod=readonly -ldflags "${GO_LDFLAGS}" ./cli
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /out/linkerd-linux-amd64 -tags prod -mod=readonly -ldflags "${GO_LDFLAGS}" ./cli
RUN CGO_ENABLED=0 GOOS=windows go build -o /out/linkerd-windows -tags prod -mod=readonly -ldflags "${GO_LDFLAGS}" ./cli

FROM golang-single-arch as golang-multi-arch
RUN ./bin/install-deps arm64
RUN ./bin/install-deps arm
RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o /out/linkerd-linux-arm64 -tags prod -mod=readonly -ldflags "-s -w" ./cli
RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -o /out/linkerd-linux-arm -tags prod -mod=readonly -ldflags "-s -w" ./cli
ARG LINKERD_VERSION
ENV GO_LDFLAGS="-s -w -X github.com/linkerd/linkerd2/pkg/version.Version=${LINKERD_VERSION}"
RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o /out/linkerd-linux-arm64 -tags prod -mod=readonly -ldflags "${GO_LDFLAGS}" ./cli
RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -o /out/linkerd-linux-arm -tags prod -mod=readonly -ldflags "${GO_LDFLAGS}" ./cli

FROM golang-${BUILD_STAGE} as golang

## export without sources & dependencies
FROM scratch
COPY LICENSE /linkerd/LICENSE
COPY --from=golang /out /out
# `ENTRYPOINT` prevents `docker build` from otherwise failing with "Error
# response from daemon: No command specified."
ENTRYPOINT ["/out/linkerd-linux-amd64"]