FROM scratch as base
ENV VERSION=1.21.4
ENV SRC_HASH=47b26a83d2b65a3c1c1bcace273b69bee49a7a7b5168a7604ded3d26a37bd787
ENV SRC_FILE=go${VERSION}.src.tar.gz
ENV SRC_SITE=https://storage.googleapis.com/golang/${SRC_FILE}
ENV VERSION_BOOTSTRAP_2=1.19.11
ENV SRC_HASH_BOOTSTRAP_2=e25c9ab72d811142b7f41ff6da5165fec2d1be5feec3ef2c66bc0bdecb431489
ENV SRC_FILE_BOOTSTRAP_2=go${VERSION_BOOTSTRAP_2}.src.tar.gz
ENV SRC_SITE_BOOTSTRAP_2=https://storage.googleapis.com/golang/${SRC_FILE_BOOTSTRAP_2}
ENV VERSION_BOOTSTRAP_1=1.4-bootstrap-20171003
ENV SRC_HASH_BOOTSTRAP_1=f4ff5b5eb3a3cae1c993723f3eab519c5bae18866b5e5f96fe1102f0cb5c3e52
ENV SRC_FILE_BOOTSTRAP_1=go${VERSION_BOOTSTRAP_1}.tar.gz
ENV SRC_SITE_BOOTSTRAP_1=https://dl.google.com/go/${SRC_FILE_BOOTSTRAP_1}

FROM base as fetch
ADD --checksum=sha256:${SRC_HASH_BOOTSTRAP_1} ${SRC_SITE_BOOTSTRAP_1} .
ADD --checksum=sha256:${SRC_HASH_BOOTSTRAP_2} ${SRC_SITE_BOOTSTRAP_2} .
ADD --checksum=sha256:${SRC_HASH} ${SRC_SITE} .

FROM fetch as build
COPY --from=stagex/busybox . /
COPY --from=stagex/gcc . /
COPY --from=stagex/bash . /
COPY --from=stagex/musl . /
COPY --from=stagex/binutils . /
RUN <<-EOF
	set -eux
	tar -xzf go${VERSION_BOOTSTRAP_1}.tar.gz
	mv go go-bootstrap-1-src
	tar -xzf go${VERSION_BOOTSTRAP_2}.src.tar.gz
	mv go go-bootstrap-2-src
	tar -xzf go${VERSION}.src.tar.gz; \
	mv go go-src
EOF
WORKDIR go-bootstrap-1-src
ENV GOOS=linux
ENV CGO_ENABLED=0
ENV GOROOT_FINAL=/go-bootstrap-1
ENV GOROOT=${GOROOT_FINAL}
ENV DEST=${GOROOT_FINAL}
ENV GOBIN=${GOROOT_FINAL}/bin
RUN --network=none <<-EOF
	set -eux
	cd src
	bash make.bash
	cd ..
	mkdir -p ${DEST}
	cp -R bin lib pkg src ${DEST}
EOF
WORKDIR ../go-bootstrap-2-src
ENV GO11MODULE=off
ENV GOROOT_BOOTSTRAP=/go-bootstrap-1
ENV GOROOT_FINAL=/go-bootstrap-2
ENV GOROOT=${GOROOT_FINAL}
ENV DEST=${GOROOT_FINAL}
ENV GOBIN=${GOROOT_FINAL}/bin
RUN --network=none <<-EOF
	set -eux
	cd src
	bash make.bash
	cd ..
	mkdir -p ${DEST}
	cp -R bin lib pkg src ${DEST}
EOF
WORKDIR ../go-src
ENV GOPROXY=off
ENV GOTOOLCHAIN=local
ENV GOFLAGS=-mod=vendor
ENV GO11MODULE=on
ENV GOROOT_BOOTSTRAP=/go-bootstrap-2
ENV GOROOT_FINAL="/lib/go"
ENV GOBIN=${GOROOT_FINAL}/bin
ENV GOROOT=/go-bootstrap-2
RUN --network=none <<-EOF
	set -eux
	cd src
	bash make.bash
EOF

FROM build as install
RUN <<-EOF
	set -eux
	mkdir -p /rootfs
	cp -R bin lib pkg src /rootfs
EOF
RUN find /rootfs -exec touch -hcd "@0" "{}" +

FROM base as test
COPY --from=install /rootfs/. /
COPY <<-EOF test.go
	package main
	import "fmt"
	func main() { fmt.Println("Success") }
EOF
RUN <<-EOF
	set -eux
	go build test.go
	./test | grep "Success"
EOF

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