Showing FI compatibility with a project in the `far-reach-but-low-coverage` API

[DonggeLiu]

The API returns an empty list of functions when a project failed to build with FI, for example:

# https://introspector.oss-fuzz.com/api/far-reach-but-low-coverage?project=arrow
{"functions":[],"result":"success"}

However, it's hard to tell the why list is empty: Is it because 'the project is not compatible with FI yet' or 'all far-reach functions in the project have high coverage'?

Would it be a good idea to add an extra field (in this API and others) specifying the project's FI-compatibility to help distinguish these two cases?
Thanks!

[DavidKorczynski]

Is it because 'the project is not compatible with FI yet' or 'all far-reach functions in the project have high coverage'?

I think the majority of the cases it will be because there is no introspector data. I added checks that gives more refined error messages as to why there are no functions in #1407 These checks only show error messages, but I will add another message that will signal if "the fuzzing is doing so well that there are no new targets".

[DonggeLiu]

Thanks, David!