Change ubuntu_install_script.sh to add the path without clobbering existing path. Also move this definition to /etc/profile.d/.

Author: mvousden

bin/ubuntu_install_script.sh

@@ -1,7 +1,24 @@
+echo "Super user authentication required to add packages (you will be \
+prompted for confirmation)."
 sudo bash install-ubuntu-packages.sh
 bash install-fftw.sh
 bash install-sundials-2.5.sh
 sudo pip install cython --upgrade
-cd ..
+pushd .. > /dev/null
 make
-echo "export PYTHONPATH=$(dirname $PWD):$PYTHONPATH" >> $HOME/.bashrc
+
+# Adds Fidimag environment variables to profile.d, if they're not already
+# there.
+FIDIMAG_PROFILE_PATH=/etc/profile.d/fidimag.sh
+if [ ! -e "$FIDIMAG_PROFILE_PATH" ]; then
+    echo "Super user authentication required to add paths."
+    sudo mkdir --parents "$(dirname $FIDIMAG_PROFILE_PATH)"
+    sudo bash -c "echo \"export PYTHONPATH=$PWD/:\\\$PYTHONPATH\"\
+> $FIDIMAG_PROFILE_PATH"
+    sudo bash -c "echo \"export LD_LIBRARY_PATH=$PWD/local/lib:\
+\\\$LD_LIBRARY_PATH\" >> $FIDIMAG_PROFILE_PATH"
+    sudo chmod 0644 "$FIDIMAG_PROFILE_PATH"
+    echo "Path written to $FIDIMAG_PROFILE_PATH."
+else
+    echo "Path added previously. Skipping."
+fi