root:
             version = v1
             creates   file:./
             creates   file:plan.py
             creates   step:./plan.py

file:plan.py
                path = plan.py
               state = STATIC
          created by   root:
            consumes   file:./
            supplies   step:./plan.py

file:./
                path = ./
               state = STATIC
          created by   root:
            supplies   file:input.txt
            supplies   file:output.txt
            supplies   file:plan.py
            supplies   step:./plan.py
            supplies   step:cp input.txt wrong.txt
            supplies   step:touch input.txt

step:./plan.py
             workdir = ./
             command = ./plan.py
               state = SUCCEEDED
          created by   root:
            consumes   file:./
            consumes   file:plan.py
             creates   step:cp input.txt wrong.txt
             creates   step:touch input.txt

step:touch input.txt
             workdir = ./
             command = touch input.txt
               state = SUCCEEDED
          created by   step:./plan.py
            consumes   file:./
             creates   file:input.txt
            supplies   file:input.txt

file:input.txt
                path = input.txt
               state = BUILT
          created by   step:touch input.txt
            consumes   file:./
            consumes   step:touch input.txt
            supplies   step:cp input.txt wrong.txt

step:cp input.txt wrong.txt
             workdir = ./
             command = cp input.txt wrong.txt
               state = FAILED
          created by   step:./plan.py
            consumes   file:./
            consumes   file:input.txt
             creates   file:output.txt
            supplies   file:output.txt

file:output.txt
                path = output.txt
               state = PENDING
          created by   step:cp input.txt wrong.txt
            consumes   file:./
            consumes   step:cp input.txt wrong.txt
