From dce96489162b05ae3463741f7f0365ff56f0de36 Mon Sep 17 00:00:00 2001 From: Linus Torvalds <torvalds@linux-foundation.org> 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 <gitster@pobox.com> --- builtin/describe.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'builtin') diff --git a/builtin/describe.c b/builtin/describe.c index 342129fdb..95915960d 100644 --- a/builtin/describe.c +++ b/builtin/describe.c @@ -21,7 +21,7 @@ static int debug; /* Display lots of verbose info */ static int all; /* Any valid ref can be used */ static int tags; /* Allow lightweight tags */ static int longformat; -static int abbrev = DEFAULT_ABBREV; +static int abbrev = -1; /* unspecified */ static int max_candidates = 10; static struct hash_table names; static int have_util; @@ -420,7 +420,11 @@ int cmd_describe(int argc, const char **argv, const char *prefix) OPT_END(), }; + git_config(git_default_config, NULL); argc = parse_options(argc, argv, prefix, options, describe_usage, 0); + if (abbrev < 0) + abbrev = DEFAULT_ABBREV; + if (max_candidates < 0) max_candidates = 0; else if (max_candidates > MAX_TAGS) -- cgit v1.2.1