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

file:./
               state = STATIC
          created by   root:
            supplies   file:../
            supplies   file:plan.py
            supplies   step:mkdir ../public/
            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   file:../../common/
             creates   file:../../common/script.py
             creates   step:mkdir ../public/
             creates   step:runpy ./script.py  # wd=../../common/

file:../../common/
               state = STATIC
          created by   step:runpy ./plan.py
            consumes   file:../../
            supplies   file:../../common/script.py
            supplies   step:runpy ./script.py  # wd=../../common/

file:../../
               state = STATIC
          created by   root:
            consumes   file:../
            supplies   file:../../common/

file:../
               state = STATIC
          created by   root:
            consumes   file:./
            supplies   file:../../
            supplies   file:../public/
            supplies   step:mkdir ../public/

file:../../common/script.py
               state = STATIC
          created by   step:runpy ./plan.py
            consumes   file:../../common/

step:mkdir ../public/
               state = SUCCEEDED
          created by   step:runpy ./plan.py
            consumes   file:../
            consumes   file:./
             creates   file:../public/
            supplies   file:../public/

file:../public/
               state = BUILT
          created by   step:mkdir ../public/
            consumes   file:../
            consumes   step:mkdir ../public/
            supplies   file:../public/foo.txt
            supplies   step:runpy ./script.py  # wd=../../common/

step:runpy ./script.py  # wd=../../common/
               state = SUCCEEDED
             env_var = STEPUP_PATH_FILTER [amended]
          created by   step:runpy ./plan.py
            consumes   file:../../common/
            consumes   file:../public/ [amended]
             creates   file:../public/foo.txt
            supplies   file:../public/foo.txt [amended]

file:../public/foo.txt
               state = BUILT
          created by   step:runpy ./script.py  # wd=../../common/
            consumes   file:../public/
            consumes   step:runpy ./script.py  # wd=../../common/
