git/GIT-VERSION-GEN
Ramsay Jones a7659747c2 GIT-VERSION-GEN: do not force abbreviation length used by 'describe'
The default version name for a Git binary is computed by running
"git describe" on the commit the binary is made out of, basing on a
tag whose name matches "v[0-9]*", e.g. v2.11.0-rc2-2-g7f1dc9.

In the very early days, with 9b88fcef7d ("Makefile: use git-describe
to mark the git version.", 2005-12-27), we used "--abbrev=4" to get
absolute minimum number of abbreviated commit object name.  This was
later changed to match the default minimum of 7 with bf505158d0
("Git 1.7.10.1", 2012-05-01).

These days, the "default minimum" scales automatically depending on
the size of the repository, and there is no point in specifying a
particular abbreviation length; all we wanted since Git 1.7.10.1
days was to get "something reasonable we would use by default".

Just drop "--abbrev=<number>" from the invocation of "git describe"
and let the command pick what it thinks is appropriate, taking the
end user's configuration and the repository contents into account.

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-06 10:08:31 -08:00

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#!/bin/sh
GVF=GIT-VERSION-FILE
DEF_VER=v2.11.GIT
LF='
'
# First see if there is a version file (included in release tarballs),
# then try git-describe, then default.
if test -f version
then
VN=$(cat version) || VN="$DEF_VER"
elif test -d ${GIT_DIR:-.git} -o -f .git &&
VN=$(git describe --match "v[0-9]*" HEAD 2>/dev/null) &&
case "$VN" in
*$LF*) (exit 1) ;;
v[0-9]*)
git update-index -q --refresh
test -z "$(git diff-index --name-only HEAD --)" ||
VN="$VN-dirty" ;;
esac
then
VN=$(echo "$VN" | sed -e 's/-/./g');
else
VN="$DEF_VER"
fi
VN=$(expr "$VN" : v*'\(.*\)')
if test -r $GVF
then
VC=$(sed -e 's/^GIT_VERSION = //' <$GVF)
else
VC=unset
fi
test "$VN" = "$VC" || {
echo >&2 "GIT_VERSION = $VN"
echo "GIT_VERSION = $VN" >$GVF
}