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Pants

Hi, I'm trying to create a subSystem and when I try `MySubsystem.global_instance()` I get the error `No such options scope: my_subsystem_scope`. Looking at the existing subsystems like ivy or coursier I don't find how you register/declare your subsystem to pants …

Hi! I think it’s a class level variable:

```

class JarDependencyManagement(Subsystem):
  """Used to keep track of pinning of external artifact versions.

  See the original design doc for this here:

  <https://docs.google.com/document/d/1AM_0e1Az_NHtR150Zsuyaa6u7InzBQGLq8MrUT57Od8/edit>
  """

  options_scope = 'jar-dependency-management'

```

thank you ! actually I found out my problem.
I needed to add

```
 @classmethod
    def subsystem_dependencies(self):
        return super(MyTask, self).subsystem_dependencies() + (MySubsystem,)
```
in the task using the subsystem