Re: [PATCH v2 1/4] setup: expose enumerated repo info

> We enumerate several different items as part of struct
> repository_format, but then actually set up those values using the
> global variables we've initialized from them.  Instead, let's pass a
> pointer to the structure down to the code where we enumerate these
> values, so we can later on use those values directly to perform setup.
>
> This technique makes it easier for us to determine additional items
> about the repository format (such as the hash algorithm) and then use
> them for setup later on, without needing to add additional global
> variables.  We can't avoid using the existing global variables since
> they're intricately intertwined with how things work at the moment, but
> this improves things for the future.