original_kernel/fs/btrfs/version.sh

#!/bin/bash
#
# determine-version -- report a useful version for releases
#
# Copyright 2008, Aron Griffis <agriffis@n01se.net>
# Copyright 2008, Oracle
# Released under the GNU GPLv2
 
v="v0.16"

which git &> /dev/null
if [ $? == 0 ]; then
    git branch >& /dev/null
    if [ $? == 0 ]; then
	    if head=`git rev-parse --verify HEAD 2>/dev/null`; then
		if tag=`git describe --tags 2>/dev/null`; then
		    v="$tag"
		fi

		# Are there uncommitted changes?
		git update-index --refresh --unmerged > /dev/null
		if git diff-index --name-only HEAD | \
		    grep -v "^scripts/package" \
		    | read dummy; then
		    v="$v"-dirty
		fi
	    fi
    fi
fi
 
echo "#ifndef __BUILD_VERSION" > .build-version.h
echo "#define __BUILD_VERSION" >> .build-version.h
echo "#define BTRFS_BUILD_VERSION \"Btrfs $v\"" >> .build-version.h
echo "#endif" >> .build-version.h

diff -q version.h .build-version.h >& /dev/null

if [ $? == 0 ]; then
    rm .build-version.h
    exit 0
fi

mv .build-version.h version.h