FROM scratch as base
ENV VERSION=3.3.1
ENV SRC_HASH=04e7b957e764ba7d32ae182d0b290e75c8785c18ab922ae6ac7087de103fd8de
ENV SRC_FILE=v${VERSION}.tar.gz
ENV SRC_SITE=https://github.com/kubernetes-sigs/kustomize/archive/refs/tags/${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
ENV GO11MODULE=on

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 ${SRC_FILE}
WORKDIR kustomize-${VERSION}/kustomize
RUN go get ./...

FROM fetch as build
RUN --network=none go build -v -trimpath

from build as install
RUN <<-EOF
    set -eu
    mkdir -p /rootfs/usr/bin/
    cp kustomize /rootfs/usr/bin/
EOF

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