root:
             creates   file:./
             creates   file:plan.py
             creates   step:runpy ./plan.py

file:./
               state = STATIC
          created by   root:
            supplies   (file:sub/)
            supplies   file:plan.py
            supplies   step:mkdir sub/blub/pup/
            supplies   step:runpy ./plan.py

file:plan.py
               state = STATIC
          created by   root:
            consumes   file:./
            supplies   step:runpy ./plan.py

step:runpy ./plan.py
               state = SUCCEEDED
             env_var = STEPUP_PATH_FILTER [amended]
          created by   root:
            consumes   file:./
            consumes   file:plan.py
             creates   step:mkdir sub/blub/pup/

step:mkdir sub/blub/pup/
               state = PENDING
          created by   step:runpy ./plan.py
            consumes   (file:sub/blub/)
            consumes   file:./
             creates   file:sub/blub/pup/
            supplies   file:sub/blub/pup/

(file:sub/blub/)
               state = AWAITED
            consumes   (file:sub/)
            supplies   file:sub/blub/pup/
            supplies   step:mkdir sub/blub/pup/

(file:sub/)
               state = AWAITED
            consumes   file:./
            supplies   (file:sub/blub/)

file:sub/blub/pup/
               state = AWAITED
          created by   step:mkdir sub/blub/pup/
            consumes   (file:sub/blub/)
            consumes   step:mkdir sub/blub/pup/
