This log command does not do what you expect.
```
[strobos] deps/chef_authn: git log --pretty=format:%H%n -n1 .                                                       (git)-[7d230f8...]-
f9998113e11ea773ed7f5ad17a980b54c274be36
[strobos] deps/chef_authn: git rev-parse HEAD                                                                       (git)-[7d230f8...]-
7d230f811038936957d2bb88c27a8a21f96006a4
```

Without the `.` I get the same result. Was there a reason to avoid `rev-parse HEAD`?