[provisioning] Do not restart shell unless necessary or requested

provision.sh

@@ -24,6 +24,10 @@ while [[ $# -gt 0 ]]; do
             INSTALL=($RECIPES)
             shift
             ;;
+        -r|--restart)
+            RESTART_SHELL=1
+            shift
+            ;;
         *)
             INSTALL+=("$1")
             shift
@@ -68,5 +72,8 @@ for recipe in "${INSTALL[@]}"; do
     _recipe $recipe
 done
 
-echo "Finished, restarting shell."
+echo "Finished"
+if [ -n "$RESTART_SHELL" ]; then
+    echo "Restarting shell."
     exec $SHELL
+fi

recipes/zsh

@@ -29,9 +29,11 @@ esac
 if [ "$__shell" != "$__zsh_bin" ]; then
     echo "Install $__zsh_bin as default shell (currently $__shell)"
     sudo chsh -s $__zsh_bin ${USER}
-fi
     export SHELL=$__zsh_bin
+    RESTART_SHELL=1
+fi
 
 if ! [ -f ${HOME}/.zshrc ]; then
     _run "Install .zshrc" ln -s ${HOME}/dotfiles/.zshrc ${HOME}/.zshrc
+    RESTART_SHELL=1
 fi