#!/bin/sh## This scripts adds local version information from the version# control systems git, mercurial (hg) and subversion (svn).## If something goes wrong, send a mail the kernel build mailinglist# (see MAINTAINERS) and CC Nico Schottelius# <nico-linuxsetlocalversion -at- schottelius.org>.## usage() {	echo "Usage: $0 [srctree]" >&2	exit 1} cd "${1:-.}" || usage # Check for git and a git repo.if head=`git rev-parse --verify --short HEAD 2>/dev/null`; then 	# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore it,	# because this version is defined in the top level Makefile.	if [ -z "`git describe --exact-match 2>/dev/null`" ]; then 		# If we are past a tagged commit (like "v2.6.30-rc5-302-g72357d5"),		# we pretty print it.		if atag="`git describe 2>/dev/null`"; then			echo "$atag" | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}' 		# If we don't have a tag at all we print -g{commitish}.		else			printf '%s%s' -g $head		fi	fi 	# Is this git on svn?	if git config --get svn-remote.svn.url >/dev/null; then	        printf -- '-svn%s' "`git svn find-rev $head`"	fi 	# Update index only on r/w media	[ -w . ] && git update-index --refresh --unmerged > /dev/null 	# Check for uncommitted changes	if git diff-index --name-only HEAD | grep -v "^scripts/package" \	    | read dummy; then		printf '%s' -dirty	fi 	# All done with git	exitfi # Check for mercurial and a mercurial repo.if hgid=`hg id 2>/dev/null`; then	tag=`printf '%s' "$hgid" | cut -d' ' -f2` 	# Do we have an untagged version?	if [ -z "$tag" -o "$tag" = tip ]; then		id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`		printf '%s%s' -hg "$id"	fi 	# Are there uncommitted changes?	# These are represented by + after the changeset id.	case "$hgid" in		*+|*+\ *) printf '%s' -dirty ;;	esac 	# All done with mercurial	exitfi # Check for svn and a svn repo.if rev=`svn info 2>/dev/null | grep '^Last Changed Rev'`; then	rev=`echo $rev | awk '{print $NF}'`	printf -- '-svn%s' "$rev" 	# All done with svn	exitfi