A bit of tangent, but I'm building an app on top of git, a thin business logic on top of very specific type of repositories.

I'd like to reuse an existing api, for example Kallithea or Gitlab layer/api that interacts with git, does anyone have opinions which one would be easier to reuse?

I fail to find documentation from Gitlab on how services are organised, if they have a git api as a separate process and how to run just that.

Now I'm discovering Kallithea, I'll have a look to it, but really appreciate if someone has done this before and has some pointers where to start.