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

file:./
               state = STATIC
          created by   root:
            supplies   file:bar.txt
            supplies   file:foo.txt
            supplies   file:plan.py
            supplies   step:copy foo.txt bar.txt
            supplies   step:runpy ./plan.py
            supplies   step:runsh echo hello > foo.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   step:copy foo.txt bar.txt
             creates   step:runsh echo hello > foo.txt

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

file:foo.txt
               state = BUILT
          created by   step:runsh echo hello > foo.txt
            consumes   file:./
            consumes   step:runsh echo hello > foo.txt
            supplies   step:copy foo.txt bar.txt

step:copy foo.txt bar.txt
               state = SUCCEEDED
          created by   step:runpy ./plan.py
            consumes   file:./
            consumes   file:foo.txt
             creates   file:bar.txt
            supplies   file:bar.txt

file:bar.txt
               state = BUILT
          created by   step:copy foo.txt bar.txt
            consumes   file:./
            consumes   step:copy foo.txt bar.txt
