Hi Michael,
On Fri, Dec 16, 2016 at 04:10:36PM +0100, Michael Biebl wrote:
> Package: git-buildpackage
> Version: 0.8.8
> Severity: normal
>
> Hi,
>
> today I ran "gbp pq export" in our Debian systemd git repository.
> This generated quite a bit of churn, in the form of
>
> -index f2d8bf5..7f2d731 100644
> +index f2d8bf57f..7f2d73199 100644
That's bad.
>
>
> This seems to be a result of using git 2.11.0 [1]:
>
> The default abbreviation length, which has historically been 7, now
> scales as the repository grows, using the approximate number of
> objects in the repository and a bit of math around the birthday
> paradox. The logic suggests to use 12 hexdigits for the Linux
> kernel, and 9 to 10 for Git itself.
>
> I wonder, whether gbp pq should setup a default core.abbrev=12 i.e.
> something which is reasonably large and constant.
That would be a problem for people that use the same repo for upstream
work. It would be best to have gbp pq set the options on the command
line of the invoked git commands but --abbrev=7 doesn't do that while
git config core.abbrev 7
in the repo works. I'll have to take a closer look.
Cheers,
-- Guido
