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Dockerfile
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ARG BUILDPLATFORM=linux/amd64
# Precompile key slow-to-build dependencies
FROM --platform=$BUILDPLATFORM golang:1.18-alpine as go-deps
WORKDIR /linkerd-build
COPY go.mod go.sum ./
COPY bin/install-deps bin/
RUN go mod download
ARG TARGETARCH
RUN ./bin/install-deps $TARGETARCH
## compile tap
FROM go-deps as golang
WORKDIR /linkerd-build
COPY pkg pkg
# TODO: remove after https://github.com/linkerd/linkerd2/issues/5661
COPY controller controller
# TODO: remove when BuildResource is refactored
# https://github.com/linkerd/linkerd2/issues/5589
COPY viz/metrics-api/gen/viz viz/metrics-api/gen/viz
COPY viz/tap viz/tap
COPY viz/pkg viz/pkg
ARG TARGETARCH
RUN CGO_ENABLED=0 GOOS=linux GOARCH=$TARGETARCH go build -o /out/tap -tags prod -mod=readonly -ldflags "-s -w" ./viz/tap/cmd
## package runtime
FROM scratch
COPY LICENSE /linkerd/LICENSE
COPY --from=golang /out/tap /tap
ENTRYPOINT ["/tap"]