I think fetching the environment and setting these variables should be done before we do anything else, and the decisions should be echoed as early as possible if we can. Something as simple as
```echo Trove sync folder: $TROVE_VM_OPT_STACK_SOURCE
echo Synced on box as $TROVE_VM_SYNC_FOLDER_LOCATION```
if we can do that in the Vagrantfile.