adding further debug info

hello-world/drun.sh

 . ~/env/bin/activate
 
+id
+ls -l
+
 python hello_world.py

hello-world/hello_world.py

 import os
 
+print("Trying to write 'Hello, world!' into products/hello.txt")
+
 try:
     with open("products/hello.txt", "w") as fd:
         fd.write("Hello, world!")
@@ -17,4 +19,6 @@ except PermissionError:
 except FileNotFoundError:
     raise
 
+print("Done!")
+