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>
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Junio C Hamano

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@ -21,7 +21,7 @@ static int debug; /* Display lots of verbose info */
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static int all; /* Any valid ref can be used */
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static int tags; /* Allow lightweight tags */
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static int longformat;
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static int abbrev = DEFAULT_ABBREV;
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static int abbrev = -1; /* unspecified */
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static int max_candidates = 10;
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static struct hash_table names;
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static int have_util;
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@ -420,7 +420,11 @@ int cmd_describe(int argc, const char **argv, const char *prefix)
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OPT_END(),
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, options, describe_usage, 0);
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if (abbrev < 0)
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abbrev = DEFAULT_ABBREV;
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if (max_candidates < 0)
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max_candidates = 0;
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else if (max_candidates > MAX_TAGS)
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