From: Linus Torvalds <torvalds@linux-foundation.org>
To: Junio C Hamano <gitster@pobox.com>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Changing the default for "core.abbrev"?
Date: Sun, 25 Sep 2016 18:39:35 -0700 [thread overview]
Message-ID: <CA+55aFy0_pwtFOYS1Tmnxipw9ZkRNCQHmoYyegO00pjMiZQfbg@mail.gmail.com> (raw)
The default value for commit abbreviation (environment.c: 19) is seven:
int minimum_abbrev = 4, default_abbrev = 7;
which back in the dark early days of git was fairly reasonable.
It's probably still a perfectly fine default for lots of projects,
since 7 hex digits is a few hundred million unique values, and you
won't really start to get very many collisions in that until you get
closer to a million objects.
The kernel, these days, is at roughly 5 million objects, and while the
seven hex digits are still often enough for uniqueness (and git will
always add digits *until* it is unique), it's long been at the point
where I tell people to do
git config --global core.abbrev 12
because even though git will extend the seven hex digits until the
object name is unique, that only reflects the *current* situation in
the repository. With 5 million objects and a very healthy growth rate,
a 7-8 hex digit number that is unique today is not necessarily unique
a month or two from now, and then it gets annoying when a commit
message has a short git ID that is no longer unique when you go back
and try to figure out what went wrong in that commit.
I can just keep reminding kernel maintainers and developers to update
their git config, but maybe it would be a good idea to just admit that
the defaults picked in 2005 weren't necessarily the best ones
possible, and those could be bumped up a bit?
I think I mentioned this some time ago, and it's not a huge deal, but
I thought I'd just mention it again because it came up again today for
me..
Thanks,
Linus
next reply other threads:[~2016-09-26 1:39 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-26 1:39 Linus Torvalds [this message]
2016-09-26 3:46 ` Changing the default for "core.abbrev"? Junio C Hamano
2016-09-26 4:34 ` Jeff King
2016-09-26 4:45 ` Junio C Hamano
2016-09-26 11:57 ` [PATCH 0/10] helping people resolve ambiguous sha1s Jeff King
2016-09-26 11:59 ` [PATCH 01/10] get_sha1: detect buggy calls with multiple disambiguators Jeff King
2016-09-26 16:37 ` Junio C Hamano
2016-09-26 17:21 ` Jeff King
2016-09-26 17:50 ` Junio C Hamano
2016-09-26 11:59 ` [PATCH 02/10] get_sha1: avoid repeating ourselves via ONLY_TO_DIE Jeff King
2016-09-26 11:59 ` [PATCH 03/10] get_sha1: propagate flags to child functions Jeff King
2016-09-26 11:59 ` [PATCH 04/10] get_short_sha1: peel tags when looking for treeish Jeff King
2016-09-26 12:11 ` Jeff King
2016-09-26 16:55 ` Junio C Hamano
2016-09-26 17:23 ` Jeff King
2016-09-26 12:00 ` [PATCH 05/10] get_short_sha1: refactor init of disambiguation code Jeff King
2016-09-26 12:00 ` [PATCH 06/10] get_short_sha1: NUL-terminate hex prefix Jeff King
2016-09-26 17:10 ` Junio C Hamano
2016-09-26 17:25 ` Jeff King
2016-09-26 17:36 ` Junio C Hamano
2016-09-26 12:00 ` [PATCH 07/10] get_short_sha1: mark ambiguity error for translation Jeff King
2016-09-26 12:00 ` [PATCH 08/10] sha1_array: let callbacks interrupt iteration Jeff King
2016-09-26 12:00 ` [PATCH 09/10] for_each_abbrev: drop duplicate objects Jeff King
2016-09-26 12:00 ` [PATCH 10/10] get_short_sha1: list ambiguous objects on error Jeff King
2016-09-26 16:36 ` Linus Torvalds
2016-09-27 5:42 ` Jacob Keller
2016-09-27 12:38 ` Jeff King
2016-09-29 13:01 ` Kyle J. McKay
2016-09-29 13:24 ` Jeff King
2016-09-29 14:36 ` Kyle J. McKay
2016-09-29 14:55 ` Jeff King
2016-09-26 17:30 ` Junio C Hamano
2016-09-26 17:34 ` Jeff King
2016-09-26 17:39 ` Junio C Hamano
2016-09-29 11:46 ` Kyle J. McKay
2016-09-29 13:03 ` Jeff King
2016-09-29 17:19 ` Junio C Hamano
2016-09-30 5:51 ` Jacob Keller
2019-02-04 16:12 ` [RFC/PATCH] core.abbrev doc: document and test the abbreviation length Ævar Arnfjörð Bjarmason
2019-02-04 19:13 ` Junio C Hamano
2019-02-04 20:04 ` Junio C Hamano
2019-02-04 21:36 ` Ævar Arnfjörð Bjarmason
2019-02-04 23:32 ` Jeff King
2019-02-04 23:50 ` Ævar Arnfjörð Bjarmason
2019-02-06 18:29 ` Jeff King
2019-02-06 18:36 ` Ævar Arnfjörð Bjarmason
2016-09-26 6:33 ` Changing the default for "core.abbrev"? Matthieu Moy
2016-09-26 12:09 ` Jeff King
2016-09-29 13:01 ` Kyle J. McKay
2016-09-26 7:13 ` Christian Couder
2016-09-28 23:30 ` [PATCH 0/4] raising core.abbrev default to 12 hexdigits Junio C Hamano
2016-09-28 23:30 ` [PATCH 1/4] config: allow customizing /etc/gitconfig location Junio C Hamano
2016-09-29 9:53 ` Jakub Narębski
2016-09-29 17:20 ` Junio C Hamano
2016-09-29 17:45 ` Matthieu Moy
2016-09-28 23:30 ` [PATCH 2/4] t13xx: do not assume system config is empty Junio C Hamano
2016-09-29 9:01 ` Jeff King
2016-09-29 18:13 ` Junio C Hamano
2016-09-29 18:26 ` Jeff King
2016-09-29 18:57 ` Junio C Hamano
2016-09-29 19:18 ` Jeff King
2016-09-29 19:57 ` Junio C Hamano
2016-09-29 19:06 ` Junio C Hamano
2016-09-29 19:26 ` Jeff King
2016-09-29 21:03 ` Junio C Hamano
2016-09-29 21:08 ` Jeff King
2016-09-28 23:30 ` [PATCH 3/4] worktree: honor configuration variables Junio C Hamano
2016-09-28 23:30 ` [PATCH 4/4] core.abbrev: raise the default abbreviation to 12 hexdigits Junio C Hamano
2016-09-29 2:44 ` SZEDER Gábor
2016-09-29 5:27 ` Lukas Fleischer
2016-09-29 9:22 ` Jeff King
2016-09-29 9:15 ` Jeff King
2016-09-29 10:03 ` Matthieu Moy
2016-09-29 12:52 ` SZEDER Gábor
2016-09-29 5:58 ` Johannes Sixt
2016-09-29 18:05 ` Junio C Hamano
2016-09-29 18:37 ` Linus Torvalds
2016-09-29 18:55 ` Linus Torvalds
2016-09-29 19:06 ` Linus Torvalds
2016-09-29 19:42 ` Junio C Hamano
2016-09-30 0:56 ` Mike Hommey
2016-09-30 1:01 ` Linus Torvalds
2016-09-30 19:41 ` Ævar Arnfjörð Bjarmason
2016-09-29 19:16 ` Jeff King
2016-09-29 19:40 ` Linus Torvalds
2016-09-29 19:45 ` Junio C Hamano
2016-09-29 21:53 ` Linus Torvalds
2016-09-29 23:13 ` Junio C Hamano
2016-09-29 23:20 ` Junio C Hamano
2016-09-30 0:20 ` Linus Torvalds
2016-09-30 0:28 ` Linus Torvalds
2016-09-30 0:57 ` Linus Torvalds
2016-09-30 1:18 ` Linus Torvalds
2016-09-30 3:54 ` Junio C Hamano
2016-09-30 4:10 ` Junio C Hamano
2016-09-30 4:18 ` Linus Torvalds
2016-09-30 4:29 ` Linus Torvalds
2016-09-30 4:27 ` Junio C Hamano
2016-09-30 4:35 ` Junio C Hamano
2016-09-30 18:40 ` Junio C Hamano
2016-09-30 18:51 ` Linus Torvalds
2016-09-30 19:00 ` Junio C Hamano
2016-09-30 4:11 ` Linus Torvalds
2016-09-30 8:06 ` Jeff King
2016-09-30 17:54 ` Linus Torvalds
2016-09-30 18:05 ` Jeff King
2016-09-30 18:21 ` Linus Torvalds
2016-09-30 20:01 ` Junio C Hamano
2016-09-30 17:56 ` Junio C Hamano
2016-09-30 7:47 ` Jeff King
2016-09-29 9:25 ` Jeff King
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