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

file:./
               state = STATIC
          created by   root:
            supplies   (file:pong.txt)
            supplies   file:ping.txt
            supplies   file:plan.py
            supplies   file:work.py
            supplies   file:work.txt
            supplies   step:runpy ./plan.py
            supplies   step:runpy ./work.py
            supplies   step:runsh echo ping > ping.txt

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   file:work.py
             creates   step:runpy ./work.py
             creates   step:runsh echo ping > ping.txt

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

step:runpy ./work.py
               state = PENDING
             env_var = STEPUP_PATH_FILTER [amended]
          created by   step:runpy ./plan.py
            consumes   (file:pong.txt) [amended]
            consumes   file:./
            consumes   file:ping.txt [amended]
            consumes   file:work.py
             creates   file:work.txt
            supplies   file:work.txt

file:work.txt
               state = AWAITED
          created by   step:runpy ./work.py
            consumes   file:./
            consumes   step:runpy ./work.py

step:runsh echo ping > ping.txt
               state = SUCCEEDED
          created by   step:runpy ./plan.py
            consumes   file:./
             creates   file:ping.txt
            supplies   file:ping.txt

file:ping.txt
               state = BUILT
          created by   step:runsh echo ping > ping.txt
            consumes   file:./
            consumes   step:runsh echo ping > ping.txt
            supplies   step:runpy ./work.py

(file:pong.txt)
               state = AWAITED
            consumes   file:./
            supplies   step:runpy ./work.py
