Change image for catalyst.

Dockerfile

@@ -1,24 +1,51 @@
-# name the portage image
-FROM gentoo/portage:latest as portage
+FROM python:3.7-alpine as base
 
-# image is based on stage3-amd64
-FROM gentoo/stage3-amd64:latest as stage3
+ARG CATALYST_VERSION
 
-# copy the entire portage volume in
-COPY --from=portage /usr/portage /usr/portage
+RUN git clone https://anongit.gentoo.org/git/proj/catalyst.git catalyst
 
-ARG MAKEOPTS
-ARG EMERGE_OPTS=-qv
+RUN pip install snakeoil
 
-# Install needed packages
-RUN MAKEOPTS=$MAKEOPTS emerge $EMERGE_OPTS dev-util/catalyst
+WORKDIR 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
+RUN python -m setup install
 
+FROM python:3.7-alpine
+
+
+# Copy snakeoil files
+COPY --from=base /usr/lib/python3.7/site-packages/snakeoil \
+                 /usr/lib/python3.7/site-packages/
+
+
+# Copy Catalyst library files
+COPY --from=base /usr/lib/python3.7/site-packages/catalyst \
+                 /usr/lib/python3.7/site-packages/
+
+# Copy Catalyst shared files
+COPY --from=base /usr/share/catalyst /usr/share/
+
+# Copy Catalyst configuration files
+COPY --from=base /etc/catalyst /etc/
+
+# Copy Catalyst binary
+COPY --from=base /usr/bin/catalyst /usr/bin/
+
+# Override Stage3 preclean to add perl-cleaner invocation
+COPY stage3-preclean-chroot.sh \
+    /usr/share/catalyst/targets/stage3/stage3-preclean-chroot.sh
+
+# Volume for catalyst generated files
 VOLUME /var/lib/catalyst
+
+# Volume for downloaded distfiles
 VOLUME /var/cache/portage/distfiles
+
+# Volume for generated packages
 VOLUME /var/cache/portage/packages
 
+# The entrypoint…
 COPY entrypoint.sh entrypoint.sh
+
+# ... to be called
 CMD /entrypoint.sh