mozilla-services/circus — pull request #567 by apmorton (2013-10-14 14:28:58+00:00)
Title: environment substitutions and copy_env

After the bug fix in #564, it is impossible to substitute variables from the environment circus is run in without using `copy_env=True`

How should the following be handled?

```
[watcher:w1]
cmd = $(circus.env.executable)
```

Should watcher sections be able to substitute from the global environment without `copy_env=True`, since all other sections can always do this.