share pycache

Dockerfile

@@ -5,50 +5,6 @@ FROM ${DEPS_IMAGE} AS deps
 
 ## ---
 
-FROM deps AS pycache
-SHELL [ "/bin/sh", "-ec" ]
-
-COPY /scripts/*  /usr/local/sbin/
-
-ENV PYTHONDONTWRITEBYTECODE=''
-
-## Python cache preseed
-
-RUN libpython="${PYTHON_SITE_PACKAGES%/*}" ; \
-    find "${libpython}/" -mindepth 1 -maxdepth 1 -printf '%P\0' \
-    | sed -zEn \
-      -e '/^(collections|importlib|json|re)$/p' \
-    | sort -zV \
-    | env -C "${libpython}" xargs -0r \
-      python3 -m compileall -q -j 2 ; \
-    find "${PYTHON_SITE_PACKAGES}/" -mindepth 1 -maxdepth 1 -printf '%P\0' \
-    | sed -zE \
-      -e '/\.(dist-info|pth|txt)$/d' \
-      -e '/^(pip|pkg_resources|setuptools|wheel)$/d' \
-    | sort -zV \
-    | env -C "${PYTHON_SITE_PACKAGES}" xargs -0r \
-      python3 -m compileall -q -j 2
-
-## Python cache warmup
-RUN export PYTHONPROFILEIMPORTTIME=1 ; \
-    patronictl --help ; \
-    patroni --help ; \
-    ydiff --help ; \
-    cdiff --help
-
-## Python cache adjustments
-RUN d="@$(date '+%s')" ; \
-    find /usr/local/lib/ -name '*.pyc' -exec touch -m -d "$d" {} + ; \
-    find /usr/local/lib/ -name __pycache__ -exec touch -m -d "$d" {} +
-
-WORKDIR /pycache
-RUN find /usr/local/ -type f -name '*.py[co]' -printf '%P\0' \
-    | sort -zV \
-    | tar -C /usr/local --null -T - -cf - \
-    | tar -xf -
-
-## ---
-
 FROM deps AS postgresql
 SHELL [ "/bin/sh", "-ec" ]
 
@@ -153,9 +109,6 @@ SHELL [ "/bin/sh", "-ec" ]
 
 COPY /Dockerfile  /usr/local/share/
 
-## RFC: Python cache
-COPY --from=pycache  /pycache/  /usr/local/
-
 COPY /ep.sh             /usr/local/sbin/
 COPY /postgres-shim.sh  /usr/local/sbin/
 ## quirk

Dockerfile.deps

@@ -68,7 +68,7 @@ RUN find "${PYTHON_SITE_PACKAGES}/" -mindepth 1 -maxdepth 1 -printf '%P\0' \
 
 ## ---
 
-FROM base AS deps
+FROM base AS deps-intermediate
 SHELL [ "/bin/sh", "-ec" ]
 
 COPY /Dockerfile.deps  /usr/local/share/
@@ -108,3 +108,52 @@ ENV LANG=en_US.UTF8
 
 RUN find /usr/local/sbin/ ! -type d -ls -delete ; \
     jdupes -1LSpr /usr/
+
+## ---
+
+FROM deps-intermediate AS pycache
+SHELL [ "/bin/sh", "-ec" ]
+
+COPY /scripts/*  /usr/local/sbin/
+
+ENV PYTHONDONTWRITEBYTECODE=''
+
+## Python cache preseed
+
+RUN libpython="${PYTHON_SITE_PACKAGES%/*}" ; \
+    find "${libpython}/" -mindepth 1 -maxdepth 1 -printf '%P\0' \
+    | sed -zEn \
+      -e '/^(collections|importlib|json|re)$/p' \
+    | sort -zV \
+    | env -C "${libpython}" xargs -0r \
+      python3 -m compileall -q -j 2 ; \
+    find "${PYTHON_SITE_PACKAGES}/" -mindepth 1 -maxdepth 1 -printf '%P\0' \
+    | sed -zE \
+      -e '/\.(dist-info|pth|txt)$/d' \
+      -e '/^(pip|pkg_resources|setuptools|wheel)$/d' \
+    | sort -zV \
+    | env -C "${PYTHON_SITE_PACKAGES}" xargs -0r \
+      python3 -m compileall -q -j 2
+
+## Python cache warmup
+RUN export PYTHONPROFILEIMPORTTIME=1 ; \
+    patronictl --help ; \
+    patroni --help ; \
+    ydiff --help ; \
+    cdiff --help
+
+## Python cache adjustments
+RUN d="@$(date '+%s')" ; \
+    find /usr/local/lib/ -name '*.pyc' -exec touch -m -d "$d" {} + ; \
+    find /usr/local/lib/ -name __pycache__ -exec touch -m -d "$d" {} +
+
+WORKDIR /pycache
+RUN find /usr/local/ -type f -name '*.py[co]' -printf '%P\0' \
+    | sort -zV \
+    | tar -C /usr/local --null -T - -cf - \
+    | tar -xf -
+  
+FROM deps-intermediate AS deps
+
+## RFC: Python cache
+COPY --from=pycache  /pycache/  /usr/local/