Julia it may be easier to just do it yourself.[return]
Easy technically. Hard culturally. Michael Smith brought up the issue of intermittent failures. When you get those, whether that's because the project itself is broken or because the CI build is broken, people will start checking in bad code. There are environments where people don't do that -- for the better part of a decade, I worked at a company where people would track down basically any test failure ever, even (or especially) if the failure was something that disappeared with no explanation. How do you convince people to care that much? That's hard.
How do you convince people to use a system like bors, where you don't have to care to avoid breaking the build? That's much easier, though still harder than the technical problems involved in building bors.[return]