#!/bin/sh# SPDX-License-Identifier: GPL-2.0## 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=$(git rev-parse --verify HEAD 2>/dev/null); then 		# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore		# it, because this version is defined in the top level Makefile.		if [ -z "$(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", $(NF-1))}'			fi 			# Add -g and exactly 12 hex chars.			printf '%s%s' -g "$(echo $head | cut -c1-12)"		fi 		# Check for uncommitted changes.		# This script must avoid any write attempt to the source tree,		# which might be read-only.		# You cannot use 'git describe --dirty' because it tries to		# create .git/index.lock .		# First, with git-status, but --no-optional-locks is only		# supported in git >= 2.14, so fall back to git-diff-index if		# it fails. Note that git-diff-index does not refresh the		# index, so it may give misleading results. See		# git-update-index(1), git-diff-index(1), and git-status(1).		if {			git --no-optional-locks status -uno --porcelain 2>/dev/null ||			git diff-index --name-only HEAD		} | read dummy; then			printf '%s' -dirty		fi	fi} collect_files(){	local file res= 	for file; do		case "$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 "$res" >.scmversion	fi	exitfi if test -e include/config/auto.conf; then	. include/config/auto.confelse	echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2	exit 1fi # localversion* files in the build and source directoryres="$(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)"elif [ "${LOCALVERSION+set}" != "set" ]; then	# If the variable LOCALVERSION is not set, append a plus	# sign if the repository is not in a clean annotated or	# signed tagged state (as git describe only looks at signed	# or annotated tags - git tag -a/-s).	#	# If the variable LOCALVERSION is set (including being set	# to an empty string), we don't want to append a plus sign.	scm=$(scm_version --short)	res="$res${scm:++}"fi echo "$res"