shell variables are more robust

they will also work if Fortran and python code are installed in
different locations.

env/DAMASK.sh

@@ -87,10 +87,12 @@ if [ ! -z "$PS1" ]; then
 fi
 
 export OMP_NUM_THREADS
+export MSC_ROOT
+export MSC_VERSION
+export DAMASK_ROOT
 export PYTHONPATH=$DAMASK_ROOT/python:$PYTHONPATH
 
 for var in BASE STAT SOLVER BRANCH; do
   unset "${var}"
 done
 unset "ENV_ROOT"
-unset "DAMASK_ROOT"

env/DAMASK.zsh

@@ -81,10 +81,12 @@ if [ ! -z "$PS1" ]; then
 fi
 
 export OMP_NUM_THREADS
+export MSC_ROOT
+export MSC_VERSION
+export DAMASK_ROOT
 export PYTHONPATH=$DAMASK_ROOT/python:$PYTHONPATH
 
 for var in SOLVER BRANCH; do
   unset "${var}"
 done
 unset "ENV_ROOT"
-unset "DAMASK_ROOT"

installation/mods_MarcMentat/apply_DAMASK_modifications.py

@@ -11,7 +11,7 @@ msc_version = float(damask.environment.options['MSC_VERSION'])
 if int(msc_version) == msc_version:
     msc_version = int(msc_version)
 msc_root     = Path(damask.environment.options['MSC_ROOT'])
-damask_root  = damask.environment.root_dir
+damask_root  = damask.environment.options['DAMASK_ROOT']
 
 parser = argparse.ArgumentParser(
      description='Apply DAMASK modification to MSC.Marc/Mentat',

python/damask/_environment.py

@@ -26,13 +26,7 @@ class Environment:
     @property
     def options(self):
         options = {}
-        for item in ['MSC_ROOT', 'MSC_VERSION']:
+        for item in ['DAMASK_ROOT', 'MSC_ROOT', 'MSC_VERSION']:
             options[item] = os.environ[item] if item in os.environ else None
 
         return options
-
-
-    @property
-    def root_dir(self):
-        """Return DAMASK root path."""
-        return Path(__file__).parents[2]

python/damask/_test.py

@@ -180,7 +180,7 @@ class Test:
 
   def fileInRoot(self,dir,file):
     """Path to a file in the root directory of DAMASK."""
-    return str(damask.environment.root_dir/dir/file)
+    return str(damask.environment.options['DAMASK_ROOT']/dir/file)
 
 
   def fileInReference(self,file):

python/damask/solver/_marc.py

@@ -54,7 +54,7 @@ class Marc:
                    optimization = '',
                   ):
 
-        usersub = environment.root_dir/'src/DAMASK_marc'
+        usersub = environment.options['DAMASK_ROOT']/'src/DAMASK_marc'
         usersub = usersub.parent/(usersub.name + ('.f90' if compile else '.marc'))
         if not usersub.is_file():
             raise FileNotFoundError(f'subroutine ({"source" if compile else "binary"}) "{usersub}" not found')