git-commit-vandalism/GIT-VERSION-GEN

#!/bin/sh

GVF=GIT-VERSION-FILE

VN=$(git-describe --abbrev=4 HEAD 2>/dev/null) || VN=v1.0.GIT
VN=$(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
}