[jrockway]

The source control system is not the piece of the equation that matters to most people. The build system is the important part. That's what prevents you from rebuilding the repository when you only change one Kubernetes config file, or what causes 100 docker images to be built because you changed a file in libc.

I think the tooling around this is fairly limited right now. I feel that most people are hoping docker caches stuff intelligently, which it doesn't. People should probably be using Bazel, but language support is hit-or-miss and it's very complicated. (It's aggravated by the fact that every language now considers itself responsible for building its own code. go "just works", which is great, but it's hard to translate that local caching to something that can be spread among multiple build workers. Bazel attempts to make all that work, but it basically has to start from scratch, which is unfortunate. It also means that you can't just start using some crazy new language unless you want to now support it in the build system. We all hate Makefiles, but the whole "foo.c becomes foo.o" model was much more straightforward than what languages do today.)