FROM linuxkit/alpine:86cd4f51b49fb9a078b50201d892a3c7973d48ec AS mirror

RUN mkdir -p /out/etc/apk && cp -r /etc/apk/* /out/etc/apk/
RUN apk add --no-cache --initdb -p /out \
    alpine-baselayout \
    busybox \
    e2fsprogs \
    e2fsprogs-extra \
    btrfs-progs \
    xfsprogs \
    xfsprogs-extra \
    musl \
    sfdisk \
    util-linux \
    && true
RUN rm -rf /out/etc/apk /out/lib/apk /out/var/cache

FROM linuxkit/alpine:86cd4f51b49fb9a078b50201d892a3c7973d48ec AS build

RUN apk add --no-cache go musl-dev
ENV GOPATH=/go PATH=$PATH:/go/bin

COPY extend.go /go/src/extend/
RUN go-compile.sh /go/src/extend

FROM scratch
ENTRYPOINT []
CMD []
WORKDIR /
COPY --from=mirror /out/ /
COPY --from=build /go/bin/extend usr/bin/extend
CMD ["/usr/bin/extend"]