### What needs to get done In `application.py` (as well as `errors.py` and `services/remotebuild.py`) there are hardcoded constants that refer to `sysexits.h`. These constants are already defined in the python standard library under `os`: https://docs.python.org/3/library/os.html#os.EX_OK More pedantic, less important: `PartsError` and `ProviderError` both exit 1 - whether these are changed to something more distinctive or not, these should be defined publically, so the values can be used in unit tests. `CraftError` exits an overrideable value that it defines internally as defaulting to 1, this can also be exposed for tests. ### Why it needs to get done Using predefined values is better practice than using magic numbers with explanatory comments.