Re: [PATCH v3 4/5] builtin/hash-object: fix uninitialized hash function

[Junio C Hamano <gitster@pobox.com>]

Patrick Steinhardt <ps@pks.im> writes:

> I'd prefer the latter -- always use SHA-1. As you say, it's easier to
> understand and doesn't create implicit mechanisms that we'll have to
> maintain going forward. Also, users didn't have a desire yet to pick a
> different algorithm than SHA-1, which probably also comes from the fact
> that SHA-256 repositories are still scarce.
> ...
> Eventually, we should then add a new option `--object-hash=` to
> git-hash-object(1) and other commands that may run outside of a Git
> repository to let the user pick their desired hash.

If we were planning to allow using something other than SHA-1 in the
future, then I do not think I agree with your argument.  We can use
the same GIT_DEFAULT_HASH mechanism to specify what hash to use without
later adding an extra option just fine.