Why does git-describe prefix the commit ID with the letter 'g'? -

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typical output of git-describe looks like

some-tag-32-gf31f980

where some-tag tag name, 32 means described commit 32 commits after commit tag, , gf31f980 means commit id uniquely abbreviated f31f980.

my question g in gf31f980. why there? first thought inserted disambiguate parsing of output of git-describe. can't think of case in helps have it. example, 32 component might omitted, , there no way know output above describes commit 32 commits after tag some-tag, rather commit at tag some-tag-32. g doesn't this.

a regex match extract commit id can search /-g([0-9a-f]+)$/. there no easy way simplify this; can't /-g(.*)$/ example because might erroneously match g in tag name. without g still /-([0-9a-f]+)$/, g isn't helping there. non-regex parsing processes behave similarly.

the g generated explicitly; relevant source code (around line 240 of builtin/describe.c) is:

static void show_suffix(int depth, const unsigned char *sha1) {         printf("-%d-g%s", depth, find_unique_abbrev(sha1, abbrev)); }

it's hard search information this, because relevant term, g, stopword.

what's g for?

jesse luehrs pointed out on twitter question answered in git-describe man page:

the "g" prefix stands "git" , used allow describing version of software depending on scm software managed with.


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