root:
             product   file:plan.py
             product   step:./plan.py

file:plan.py
               state = CONFIRMED
             creator   root:
                sink   step:./plan.py

step:./plan.py
               state = SUCCEEDED
                need = PLAN
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   root:
              source   file:plan.py
             product   step:rm .sjdksjdfkjasdfkdjsak

step:rm .sjdksjdfkjasdfkdjsak
               state = FAILED
                need = DEFAULT
             creator   step:./plan.py
             product   file:oops.txt
                sink   file:oops.txt

file:oops.txt
               state = PLANNED
             creator   step:rm .sjdksjdfkjasdfkdjsak
              source   step:rm .sjdksjdfkjasdfkdjsak
