Couple things:
- Looks like the name changed from `cpplint.py` to `cpplint`. This is I just fixed with a symlink
- Looks like the `arc diff` invocation process bails out if the linter exits with a non-0 status
```
Linting...
Exception
Some linters failed:
- CommandException: Command failed with error #1!
COMMAND
'cpplint' '/home/seth/p3/jit.h'
STDOUT
(empty)
STDERR
/home/seth/p3/jit.h:10: Do not indent within a namespace [runtime/indentation_namespace] [4]
...
(Run with `--trace` for a full exception trace.)
```
If I manually set the exit status to 0, it seems like it decides that there are no linter errors:
```
Linting...
LINT OKAY No lint problems.
Running unit tests...
No unit test engine is configured for this project.
SKIP STAGING Unable to determine repository for this change.
Created a new Differential revision:
```