FROM scratch as base
ENV VERSION=1.29.3
ENV SRC_HASH=401d29af71cb962eb328cefd5166695587f195f9bd960edd1ede630f7e98bf7a
ENV SRC_FILE=v${VERSION}.tar.gz
ENV SRC_SITE=https://github.com/kubernetes/kubernetes/archive/refs/tags/${SRC_FILE}
ENV GOPATH=/cache/go
ENV GOCACHE=/cache/
ENV GOWORK=off
ENV GOPROXY=https://proxy.golang.org,direct
ENV GOSUMDB=sum.golang.org
ENV CGO_ENABLED=0
ENV GOHOSTOS=linux
ENV GOHOSTARCH=amd64

FROM base as fetch
COPY --from=stagex/busybox . /
COPY --from=stagex/go . /
COPY --from=stagex/ca-certificates . /
ADD --checksum=sha256:${SRC_HASH} ${SRC_SITE} .
RUN tar -xvf ${SRC_FILE}
WORKDIR kubernetes-${VERSION}
RUN GOPATH="/kubernetes-${VERSION}" go mod download

FROM fetch as build
RUN --network=none go build -trimpath -v k8s.io/kubernetes/cmd/kubectl

from build as install
RUN <<-EOF
    mkdir -p /rootfs/usr/bin/
    cp kubectl /rootfs/usr/bin/
    find /rootfs -exec touch -hcd "@0" "{}" +
EOF

FROM stagex/filesystem as package
COPY --from=install /rootfs/./ /