GIT-VERSION-GEN

#!/bin/sh

GVF=GIT-VERSION-FILE
GVH=GIT-VERSION.h
DEF_VER=v1.0.0.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" ;;
    #VN="$VN-$(git describe --tags --always)" ;;
    #VN="$VN-$(git rev-parse HEAD)" ;;
 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
 echo >&2 "#define GIT_VERSION \"$VN\""
 echo "#define GIT_VERSION \"$VN\"" >$GVH
}