Sandbox::https://github.com/cloudbyside/git/blob/master/GIT-VERSION-GEN

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#!/bin/sh

GVF=GIT-VERSION-FILE

DEF_VER=v2.12.2

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"

VN=$(expr "$VN" : v*'$.*$')

if test -r $GVF

then

VC=$(sed -e 's/^GIT_VERSION = //' <$GVF)

else

VC=unset

test "$VN" = "$VC" || {

echo >&2 "GIT_VERSION = $VN"

echo "GIT_VERSION = $VN" >$GVF

}