Multistage build.

Dockerfile

@@ -1,26 +1,47 @@
-FROM python:3.6-alpine
+FROM python:3.6-alpine as base
 
 RUN apk add --no-cache --virtual .build-deps \
         git make gcc musl-dev asciidoc \
     \
     # Install deps
     && pip install snakeoil \
-    && pip install git+https://github.com/dol-sen/pyDeComp \
     \
     # Clone catalyst repository
     && git clone https://anongit.gentoo.org/git/proj/catalyst.git catalyst \
     \
     # Build and install catalyst
-    && cd catalyst \
+    && cd /catalyst \
     && make \
     && python -m setup install \
     \
+    # Get shash
+    cd / \
+    && wget ftp://mcrypt.hellug.gr/pub/mcrypt/shash/shash-0.2.6.tar.gz \
+    && tar xvzf shash-0.2.6.tar.gz \
+    && cd shash-0.2.6 && make && make install \
+    \
     # Cleanup
-    && cd .. \
+    && cd / \
     && rm -Rf catalyst \
     && apk del .build-deps
 
-RUN apk add coreutils rhash
+FROM python:3.6-alpin as base
+
+RUN apk add coreutils
+
+COPY --from=base /usr/local/lib/python3.6/site-packages/snakeoil \
+                 /usr/local/lib/python3.6/site-packages/
+
+RUN pip install git+https://github.com/dol-sen/pyDeComp
+
+COPY --from=base /usr/local/bin/shash /usr/local/bin/shash
+
+COPY --from=base /usr/local/lib/python3.6/site-packages/catalyst \
+                 /usr/local/lib/python3.6/site-packages/
+
+COPY --from=base /usr/share/catalyst /usr/share
+
+COPY --from=base /etc/catalyst /etc/
 
 # Override Stage3 preclean to add perl-cleaner invocation
 COPY stage3-preclean-chroot.sh \