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.txt
             product   file:script.py
             product   step:./script.py plan

file:config.txt
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./script.py plan

file:script.py
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./script.py plan
                sink   step:./script.py run bar
                sink   step:./script.py run foo

step:./script.py plan
               state = SUCCEEDED
                need = PLAN
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:config.txt
              source   file:script.py
             product   step:./script.py run bar
             product   step:./script.py run foo

step:./script.py run foo
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./script.py plan
              source   file:script.py
             product   file:out_foo.txt
                sink   file:out_foo.txt

file:out_foo.txt
               state = BUILT
             creator   step:./script.py run foo
              source   step:./script.py run foo

step:./script.py run bar
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./script.py plan
              source   file:script.py
             product   file:out_bar.txt
                sink   file:out_bar.txt

file:out_bar.txt
               state = BUILT
             creator   step:./script.py run bar
              source   step:./script.py run bar
