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   file:config.json
             product   file:use_config.py
             product   step:./use_config.py
             product   step:cp -p report.txt copy.txt

file:config.json
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./use_config.py

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

step:./use_config.py
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:config.json
              source   file:use_config.py
             product   file:output.txt
             product   step:echo All is fine. > other.log
             product   step:echo log written to other.log. > report.txt
                sink   file:output.txt

file:output.txt
               state = BUILT
             creator   step:./use_config.py
              source   step:./use_config.py

step:cp -p report.txt copy.txt
               state = SUCCEEDED
                need = DEFAULT
             creator   step:./plan.py
              source   file:report.txt
             product   file:copy.txt
                sink   file:copy.txt

file:report.txt
               state = BUILT
             creator   step:echo log written to other.log. > report.txt
              source   step:echo log written to other.log. > report.txt
                sink   step:cp -p report.txt copy.txt

file:copy.txt
               state = BUILT
             creator   step:cp -p report.txt copy.txt
              source   step:cp -p report.txt copy.txt

step:echo All is fine. > other.log
               state = SUCCEEDED
                need = DEFAULT
             creator   step:./use_config.py
             product   file:other.log
                sink   file:other.log

file:other.log
               state = BUILT
             creator   step:echo All is fine. > other.log
              source   step:echo All is fine. > other.log

step:echo log written to other.log. > report.txt
               state = SUCCEEDED
                need = DEFAULT
             creator   step:./use_config.py
             product   file:report.txt
                sink   file:report.txt
