Re: [GSOC PATCH v6 0/3] environment: remove sparse-checkout related global variables

> ... I wonder if instead we could change git_default_config() to expect
> a repository pointer as the callback data and use that to initialize
> things. That would mean that we would not need to move code out of
> git_default_config() to remove global variables and we would retain
> the "last one wins" behavior when two or more config keys such are
> "merge.log" and "merge.summary" set the same variable. It would be
> fairly invasive though as we'd need to pass the repository pointer
> down through all the other callbacks that end up calling
> git_default_config().