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:plan.py
            supplies   file:sub/
            supplies   step:./plan.py

step:./plan.py
             workdir = ./
             command = ./plan.py
               state = SUCCEEDED
   env_var (amended) = ROOT
                     = SUB
          created by   root:
            consumes   file:./
            consumes   file:plan.py
             creates   file:sub/
             creates   file:sub/plan.py
             creates   step:./plan.py  # wd=sub/

file:sub/
                path = sub/
               state = STATIC
          created by   step:./plan.py
            consumes   file:./
            supplies   file:sub/plan.py
            supplies   step:./plan.py  # wd=sub/

file:sub/plan.py
                path = sub/plan.py
               state = STATIC
          created by   step:./plan.py
            consumes   file:sub/
            supplies   step:./plan.py  # wd=sub/

step:./plan.py  # wd=sub/
             workdir = sub/
             command = ./plan.py
               state = SUCCEEDED
   env_var (amended) = DELAYED
                     = HERE
                     = ROOT
          created by   step:./plan.py
            consumes   file:sub/
            consumes   file:sub/plan.py
