FROM ocirep/busybox:latest as busybox
FROM ocirep/bash:latest as bash
FROM ocirep/gcc:latest as gcc
FROM ocirep/binutils:latest as binutils
FROM ocirep/musl:latest as musl

FROM busybox as stage1
COPY --from=bash . /bin/
COPY --from=gcc . /
COPY --from=binutils . /
COPY --from=musl . /
ENV GO_SITE=https://dl.google.com/go
ENV GO_VERSION=1.4-bootstrap-20171003
ENV GO_HASH=f4ff5b5eb3a3cae1c993723f3eab519c5bae18866b5e5f96fe1102f0cb5c3e52
ENV GOOS=linux
ENV CGO_ENABLED=0
ENV GOROOT_FINAL=/home/user/go-stage1
ENV GOROOT=${GOROOT_FINAL}
ENV GOBIN=${GOROOT_FINAL}/bin
ENV DEST=${GOROOT_FINAL}
RUN wget ${GO_SITE}/go${GO_VERSION}.tar.gz
RUN echo "${GO_HASH} go${GO_VERSION}.tar.gz" | sha256sum -c
RUN tar -xzf go${GO_VERSION}.tar.gz
WORKDIR go
RUN set -eux; \
    cd src; \
    bash make.bash; \
    cd ..; \
    mkdir -p ${DEST}; \
    cp -R bin lib pkg src ${DEST}

FROM busybox as stage2
COPY --from=stage1 /home/user/go-stage1 go-stage1
COPY --from=musl . /
COPY --from=bash . /bin/
ENV GO_VERSION=1.19.11
ENV GO_HASH=e25c9ab72d811142b7f41ff6da5165fec2d1be5feec3ef2c66bc0bdecb431489
ENV GO_SITE=https://storage.googleapis.com/golang
ENV GOOS=linux
ENV GO11MODULE=off
ENV CGO_ENABLED=0
ENV GOROOT_BOOTSTRAP=/home/user/go-stage1
ENV GOROOT_FINAL=/home/user/go-stage2
ENV GOROOT=${GOROOT_FINAL}
ENV GOBIN=${GOROOT_FINAL}/bin
ENV DEST=${GOROOT_FINAL}
RUN wget ${GO_SITE}/go${GO_VERSION}.src.tar.gz
RUN echo "${GO_HASH} go${GO_VERSION}.src.tar.gz" | sha256sum -c
RUN tar -xvzf go${GO_VERSION}.src.tar.gz
WORKDIR go
RUN set -eux; \
    cd src; \
    bash make.bash; \
    cd ..; \
    mkdir -p ${DEST}; \
    cp -R bin lib pkg src ${DEST}

FROM busybox as stage3
COPY --from=stage2 /home/user/go-stage2 go-stage2
COPY --from=bash . /bin/
ENV GO_VERSION=1.21.4
ENV GO_HASH=47b26a83d2b65a3c1c1bcace273b69bee49a7a7b5168a7604ded3d26a37bd787
ENV GO_SITE=https://storage.googleapis.com/golang
ENV GOOS=linux
ENV GOPROXY=off
ENV GOTOOLCHAIN=local
ENV GOFLAGS=-mod=vendor
ENV GO11MODULE=on
ENV CGO_ENABLED=0
ENV GOROOT_BOOTSTRAP=/home/user/go-stage2
ENV GOROOT_FINAL="/lib/go"
ENV GOROOT=/home/user/go-stage2
ENV GOBIN=${GOROOT_FINAL}/bin
ENV DEST=/home/user/go-stage3
RUN wget ${GO_SITE}/go${GO_VERSION}.src.tar.gz
RUN echo "${GO_HASH} go${GO_VERSION}.src.tar.gz" | sha256sum -c
RUN tar -xvzf go${GO_VERSION}.src.tar.gz
WORKDIR go
RUN set -eux; \
    cd src; \
    bash make.bash; \
    cd ..; \
    mkdir -p ${DEST}; \
    cp -R bin lib pkg src ${DEST}

FROM scratch
COPY --from=stage3 /home/user/go-stage3 /
USER 100:100
ENTRYPOINT ["/bin/go"]
CMD ["version"]