From dce96489162b05ae3463741f7f0365ff56f0de36 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Thu, 28 Oct 2010 11:28:04 -0700 Subject: Make the default abbrev length configurable The default of 7 comes from fairly early in git development, when seven hex digits was a lot (it covers about 250+ million hash values). Back then I thought that 65k revisions was a lot (it was what we were about to hit in BK), and each revision tends to be about 5-10 new objects or so, so a million objects was a big number. These days, the kernel isn't even the largest git project, and even the kernel has about 220k revisions (_much_ bigger than the BK tree ever was) and we are approaching two million objects. At that point, seven hex digits is still unique for a lot of them, but when we're talking about just two orders of magnitude difference between number of objects and the hash size, there _will_ be collisions in truncated hash values. It's no longer even close to unrealistic - it happens all the time. We should both increase the default abbrev that was unrealistically small, _and_ add a way for people to set their own default per-project in the git config file. This is the first step to first make it configurable; the default of 7 is not raised yet. Signed-off-by: Junio C Hamano --- environment.c | 1 + 1 file changed, 1 insertion(+) (limited to 'environment.c') diff --git a/environment.c b/environment.c index 9564475f4..f2d90a807 100644 --- a/environment.c +++ b/environment.c @@ -15,6 +15,7 @@ int user_ident_explicitly_given; int trust_executable_bit = 1; int trust_ctime = 1; int has_symlinks = 1; +int minimum_abbrev = 4, default_abbrev = 7; int ignore_case; int assume_unchanged; int prefer_symlink_refs; -- cgit v1.2.1