#!/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 [--save-scmversion] [srctree]" >&2	exit 1} scm_only=falsesrctree=.if test "$1" = "--save-scmversion"; then	scm_only=true	shiftfiif test $# -gt 0; then	srctree=$1	shiftfiif test $# -gt 0 -o ! -d "$srctree"; then	usagefi scm_version(){	local short	short=false 	cd "$srctree"	if test -e .scmversion; then		cat .scmversion		return	fi	if test "$1" = "--short"; then		short=true	fi 	# Check for git and a git repo.	if test -z "$(git rev-parse --show-cdup 2>/dev/null)" &&	   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 only the short version is requested, don't bother			# running further git commands			if $short; then				echo "+"				return			fi			# If we are past a tagged commit (like			# "v2.6.30-rc5-302-g72357d5"), we pretty print it.			if atag="`git describe 2>/dev/null`"; then				echo "$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 $head`"		fi 		# Check for uncommitted changes		if git diff-index --name-only HEAD | grep -qv "^scripts/package"; then			printf '%s' -dirty		fi 		# All done with git		return	fi 	# Check for mercurial and a mercurial repo.	if test -d .hg && hgid=`hg id 2>/dev/null`; then		# Do we have an tagged version?  If so, latesttagdistance == 1		if [ "`hg log -r . --template '{latesttagdistance}'`" == "1" ]; then			id=`hg log -r . --template '{latesttag}'`			printf '%s%s' -hg "$id"		else			tag=`printf '%s' "$hgid" | cut -d' ' -f2`			if [ -z "$tag" -o "$tag" = tip ]; then				id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`				printf '%s%s' -hg "$id"			fi		fi 		# Are there uncommitted changes?		# These are represented by + after the changeset id.		case "$hgid" in			*+|*+\ *) printf '%s' -dirty ;;		esac 		# All done with mercurial		return	fi 	# Check for svn and a svn repo.	if rev=`LANG= LC_ALL= LC_MESSAGES=C svn info 2>/dev/null | grep '^Last Changed Rev'`; then		rev=`echo $rev | awk '{print $NF}'`		printf -- '-svn%s' "$rev" 		# All done with svn		return	fi} collect_files(){	local file res 	for file; do		case "$file" in		*\~*)			continue			;;		esac		if test -e "$file"; then			res="$res$(cat "$file")"		fi	done	echo "$res"} if $scm_only; then	if test ! -e .scmversion; then		res=$(scm_version)		echo "$res" >.scmversion	fi	exitfi if test -e include/config/auto.conf; then	. include/config/auto.confelse	echo "Error: kernelrelease not valid - run 'make prepare' to update it"	exit 1fi # localversion* files in the build and source directoryres="$(collect_files localversion*)"if test ! "$srctree" -ef .; then	res="$res$(collect_files "$srctree"/localversion*)"fi # CONFIG_LOCALVERSION and LOCALVERSION (if set)res="${res}${CONFIG_LOCALVERSION}${LOCALVERSION}" # scm version string if not at a tagged commitif test "$CONFIG_LOCALVERSION_AUTO" = "y"; then	# full scm version string	res="$res$(scm_version)"else	# append a plus sign if the repository is not in a clean	# annotated or signed tagged state (as git describe only	# looks at signed or annotated tags - git tag -a/-s) and	# LOCALVERSION= is not specified	if test "${LOCALVERSION+set}" != "set"; then		scm=$(scm_version --short)		res="$res${scm:++}"	fifi echo "$res"