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:driver.py
             product   file:wait_for.py
             product   step:./driver.py
             product   step:./wait_for.py go1.txt gate1.txt
             product   step:./wait_for.py go2.txt gate2.txt

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

file:wait_for.py
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./wait_for.py go1.txt gate1.txt
                sink   step:./wait_for.py go2.txt gate2.txt
                sink   step:./wait_for.py trigger_driver.txt trigger_work.txt

step:./driver.py
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:driver.py
              source   file:gate1.txt [dynamic]
              source   file:gate2.txt [dynamic]
             product   step:./wait_for.py trigger_driver.txt trigger_work.txt

step:./wait_for.py go1.txt gate1.txt
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:wait_for.py
             product   file:gate1.txt
                sink   file:gate1.txt

file:gate1.txt
               state = BUILT
             creator   step:./wait_for.py go1.txt gate1.txt
              source   step:./wait_for.py go1.txt gate1.txt
                sink   step:./driver.py

step:./wait_for.py go2.txt gate2.txt
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:wait_for.py
             product   file:gate2.txt
                sink   file:gate2.txt

file:gate2.txt
               state = BUILT
             creator   step:./wait_for.py go2.txt gate2.txt
              source   step:./wait_for.py go2.txt gate2.txt
                sink   step:./driver.py

step:./wait_for.py trigger_driver.txt trigger_work.txt
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./driver.py
              source   file:wait_for.py
