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:message.txt
            supplies   file:plan.py
            supplies   file:sub/
            supplies   step:./plan.py
            supplies   step:cp -aT sub/message.txt message.txt

step:./plan.py
             workdir = ./
             command = ./plan.py
               state = SUCCEEDED
          created by   root:
            consumes   file:./
            consumes   file:plan.py
             creates   dg:'sub/**'
             creates   step:cp -aT sub/message.txt message.txt

dg:'sub/**'
          created by   step:./plan.py
             creates   file:sub/
             creates   file:sub/message.txt

file:sub/
                path = sub/
               state = MISSING
          created by   dg:'sub/**'
            consumes   file:./
            supplies   file:sub/message.txt

file:sub/message.txt
                path = sub/message.txt
               state = MISSING
          created by   dg:'sub/**'
            consumes   file:sub/
            supplies   step:cp -aT sub/message.txt message.txt

step:cp -aT sub/message.txt message.txt
             workdir = ./
             command = cp -aT sub/message.txt message.txt
               state = PENDING
          created by   step:./plan.py
            consumes   file:./
            consumes   file:sub/message.txt
             creates   file:message.txt
            supplies   file:message.txt

file:message.txt
                path = message.txt
               state = PENDING
          created by   step:cp -aT sub/message.txt message.txt
            consumes   file:./
            consumes   step:cp -aT sub/message.txt message.txt
