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# This Dockerfile creates a gentoo stage3 container image. By default it 
# creates a stage3-amd64 image. It utilizes a multi-stage build and requires 
# docker-17.05.0 or later. It fetches a daily snapshot from the official 
# sources and verifies its checksum as well as its gpg signature.

# As gpg keyservers sometimes are unreliable, we use multiple gpg server pools
# to fetch the signing key.

ARG BOOTSTRAP
FROM ${BOOTSTRAP:-alpine:3.6} as builder

WORKDIR /gentoo

ARG ARCH=amd64
ARG MICROARCH=amd64
ARG SUFFIX
ARG DIST="http://distfiles.gentoo.org/releases/${ARCH}/autobuilds/"
ARG SIGNING_KEY="0xBB572E0E2D182910"

RUN echo "Building Gentoo Container image for ${ARCH} ${SUFFIX} fetching from ${DIST}" \
 && apk --no-cache add gnupg tar wget \
 && STAGE3PATH="$(wget -q -O- "${DIST}/latest-stage3-${MICROARCH}${SUFFIX}.txt" | tail -n 1 | cut -f 1 -d ' ')" \
 && STAGE3="$(basename ${STAGE3PATH})" \
 && wget -q -c "${DIST}/${STAGE3PATH}" "${DIST}/${STAGE3PATH}.CONTENTS" "${DIST}/${STAGE3PATH}.DIGESTS.asc" \
 && gpg --keyserver hkps.pool.sks-keyservers.net --recv-keys ${SIGNING_KEY} \
 || gpg --keyserver keys.gnupg.net --recv-keys ${SIGNING_KEY} \
 || gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys ${SIGNING_KEY} \
 && gpg --verify "${STAGE3}.DIGESTS.asc" \
 && awk '/# SHA512 HASH/{getline; print}' ${STAGE3}.DIGESTS.asc | sha512sum -c \
 && tar xjpf "${STAGE3}" --xattrs --numeric-owner \
 && sed -i -e 's/#rc_sys=""/rc_sys="docker"/g' etc/rc.conf \
 && echo 'UTC' > etc/timezone \
 && rm ${STAGE3}.DIGESTS.asc ${STAGE3}.CONTENTS ${STAGE3}

FROM scratch

WORKDIR /
COPY --from=builder /gentoo/ /
CMD ["/bin/bash"]