Blacklist files to pull

I’m snapping a project that generates .ipc files at runtime for development purposes.
Snapcraft doesn’t seem to handle them and gives this:
[Errno 5] Input/output error: '/root/project/gui/runner.ipc'
It’s not a big deal since I can just delete them and rerun snapcraft, but I’m lazy and wondered if there is a nifty way to tell snapcraft not to pull any .ipc files (or really anything in the gui/ directory), kind of like the stage and prime part keywords. I did see the override-pull option, but I didn’t see an environment variable to the pre-pulled source is.