Re: [PATCH 2/2] version --build-options: report commit, too, if possible

Hi,

Johannes Schindelin wrote:

In particular when local tags are used (or tags that are pushed to some
fork) to build Git, it is very hard to figure out from which particular
revision a particular Git executable was built.

Hm, can you say more about how this comes up in practice?  I wonder if
we should always augment the version string with the commit hash.
E.g. I am running

	git version 2.15.1.424.g9478a66081

now, which already includes the commit hash because it disambiguates
the .424 thing, but depending on the motivation, maybe we would also
want

	git version 2.15.1.0.g9b185bef0c15

for people running v2.15.1 (or at least when such a tag is not a well
known, published tag).

We need to be careful, though, to report when the current commit cannot be
determined, e.g. when building from a tarball without any associated Git
repository.

This means that on Debian, it would always print

	built from commit: (unknown)

Maybe I shouldn't care, but I wonder if there's a way to improve on
that. E.g. should there be a makefile knob to allow Debian to specify
what to put there?

Thanks,
Jonathan