Repo init.

Dockerfile

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+# name the portage image
+FROM gentoo/portage:latest as portage
+
+# image is based on stage3-amd64
+FROM gentoo/stage3-amd64:latest as stage3
+
+# copy the entire portage volume in
+COPY --from=portage /usr/portage /usr/portage
+
+ARG MAKEOPTS
+ARG EMERGE_OPTS=-qv
+
+# Install needed packages
+RUN MAKEOPTS=$MAKEOPTS emerge $EMERGE_OPTS dev-util/catalyst
+
+COPY stage3-preclean-chroot.sh /usr/share/catalyst/targets/stage3/stage3-preclean-chroot.sh
+COPY stage4-chroot.sh /usr/share/catalyst/targets/stage4/stage4-chroot.sh
+
+VOLUME /var/lib/catalyst
+VOLUME /var/cache/portage/distfiles
+VOLUME /var/cache/portage/packages
+
+COPY entrypoint.sh entrypoint.sh
+CMD /entrypoint.sh

entrypoint.sh

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+#!/bin/bash
+
+die() {
+    echo $* >&2
+    exit 1
+}
+
+export SHELL=/bin/bash
+export PYTHON=python
+
+# Download latest portage snapshot
+wget -O /var/lib/catalyst/store/snapshots/portage-latest.tar.bz2 \
+    https://gentoo.osuosl.org/releases/snapshots/current/portage-latest.tar.bz2
+
+# Update stage3 snapshot
+catalyst -c /var/lib/catalyst/catalyst.conf \
+    -f /var/lib/catalyst/stage3.spec -a
+
+# Update custom packages
+catalyst -c /var/lib/catalyst/catalyst.conf \
+    -f /var/lib/catalyst/build.spec
+
+# Copy distfiles to web directory
+rsync -avug /var/lib/catalyst/store/packages/default/stage3-amd64/ \
+    /var/cache/portage/packages/

stage3-preclean-chroot.sh

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+#!/bin/bash
+
+export RUN_DEFAULT_FUNCS="no"
+
+source /tmp/chroot-functions.sh
+
+perl-cleaner --reallyall
+
+update_env_settings
+show_debug
+
+cleanup_stages
+
+if [ -n "${clst_DISTCC}" ]
+then
+        portageq has_version / sys-devel/distcc
+        if [ $? == 0 ]; then
+                run_merge -C sys-devel/distcc || exit 1
+        fi
+fi
+
+if [ -n "${clst_ICECREAM}" ]
+then
+        run_merge -C sys-devel/icecream || exit 1
+fi

stage4-chroot.sh

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+#!/bin/bash
+
+source /tmp/chroot-functions.sh
+
+export SHELL=/bin/bash
+export PYTHON=python
+
+## START BUILD
+setup_pkgmgr
+
+echo "Bringing system up to date using profile specific use flags"
+run_merge -u @system
+
+echo "Emerging packages using stage4 use flags"
+
+run_merge "${clst_packages}"
+