[!13] Make sure that the python directories are in the user space

Merge branch 'feature/user-space-python-directories' into 'master'

See merge request [spack/dune-spack!13]

  [spack/dune-spack!13]: Nonespack/dune-spack/merge_requests/13

Dockerfile

@@ -11,8 +11,8 @@ RUN export DEBIAN_FRONTEND=noninteractive; \
   ca-certificates \
   git             \
   procps          \
-  python          \
-  python-dev      \
+  python3          \
+  python3-dev      \
   && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 ARG version=master

packages/dune/package.py

@@ -21,6 +21,7 @@
 # ----------------------------------------------------------------------------
 
 import os
+from pathlib import Path
 from spack import *
 
 
@@ -223,12 +224,12 @@ class Dune(CMakePackage):
         # Additionally, we need to set the workspace for the Python bindings to something
         # that is unique to this build of the dune module (it defaults to ~/.cache)
         if '+python' in self.spec:
-            env.set('DUNE_PY_DIR', self.prefix)
+            env.set('DUNE_PY_DIR', join_path(Path.home(), '.cache', 'dune-py', self.spec.dag_hash()))
 
         # For those modules that typically work with the Dune Virtualenv,
         # we export the location of the virtualenv as an environment variable.
         if '+testtools' in self.spec:
-            env.set('DUNE_PYTHON_VIRTUALENV_PATH', join_path(self.prefix, 'dune-python-env'))
+            env.set('DUNE_PYTHON_VIRTUALENV_PATH', join_path(Path.home(), '.cache', 'dune-python-env', self.spec.dag_hash()))
 
     def cmake_args(self):
         """Populate cmake arguments."""