better bootstrap.sh

playbook-template/bootstrap.sh

@@ -39,7 +39,7 @@ ansible-galaxy install -r requirements.galaxy.yml
 ansible-playbook -i inventory.yaml playbook.yml
 
 # to stay in our comfy virtualenv
-if [[ -n "$SHELL" ]]
+if [[ -z "$SHELL" ]]
 then
   SHELL="bash"
 fi