#!/bin/sh# SPDX-License-Identifier: GPL-2.0## This scripts adds local version information from the version# control system git.## If something goes wrong, send a mail the kernel build mailinglist# (see MAINTAINERS) and CC Nico Schottelius# <nico-linuxsetlocalversion -at- schottelius.org>.## set -e usage() {	echo "Usage: $0 [--no-local] [srctree]" >&2	exit 1} no_local=falseif test "$1" = "--no-local"; then	no_local=true	shiftfi srctree=.if test $# -gt 0; then	srctree=$1	shiftfiif test $# -gt 0 -o ! -d "$srctree"; then	usagefi try_tag() {	tag="$1" 	# Is $tag an annotated tag?	if [ "$(git cat-file -t "$tag" 2> /dev/null)" != tag ]; then		 return	fi 	# Is it an ancestor of HEAD, and if so, how many commits are in $tag..HEAD?	# shellcheck disable=SC2046 # word splitting is the point here	set -- $(git rev-list --count --left-right "$tag"...HEAD 2> /dev/null) 	# $1 is 0 if and only if $tag is an ancestor of HEAD. Use	# string comparison, because $1 is empty if the 'git rev-list'	# command somehow failed.	if [ "$1" != 0 ]; then		return	fi 	# $2 is the number of commits in the range $tag..HEAD, possibly 0.	count="$2"} scm_version(){	local short=false	local no_dirty=false	local tag 	while [ $# -gt 0 ];	do		case "$1" in		--short)			short=true;;		--no-dirty)			no_dirty=true;;		esac		shift	done 	cd "$srctree" 	if test -n "$(git rev-parse --show-cdup 2>/dev/null)"; then		return	fi 	if ! head=$(git rev-parse --verify HEAD 2>/dev/null); then		return	fi 	# mainline kernel:  6.2.0-rc5  ->  v6.2-rc5	# stable kernel:    6.1.7      ->  v6.1.7	version_tag=v$(echo "${KERNELVERSION}" | sed -E 's/^([0-9]+\.[0-9]+)\.0(.*)$/\1\2/') 	# try_tag initializes count if the tag is usable.	count= 	# If a localversion* file exists, and the corresponding	# annotated tag exists and is an ancestor of HEAD, use	# it. This is the case in linux-next.	if [ -n "${file_localversion#-}" ] ; then		try_tag "${file_localversion#-}"	fi 	# Otherwise, if a localversion* file exists, and the tag	# obtained by appending it to the tag derived from	# KERNELVERSION exists and is an ancestor of HEAD, use	# it. This is e.g. the case in linux-rt.	if [ -z "${count}" ] && [ -n "${file_localversion}" ]; then		try_tag "${version_tag}${file_localversion}"	fi 	# Otherwise, default to the annotated tag derived from KERNELVERSION.	if [ -z "${count}" ]; then		try_tag "${version_tag}"	fi 	# If we are at the tagged commit, we ignore it because the	# version is well-defined. If none of the attempted tags exist	# or were usable, $count is still empty.	if [ -z "${count}" ] || [ "${count}" -gt 0 ]; then 		# If only the short version is requested, don't bother		# running further git commands		if $short; then			echo "+"			return		fi 		# If we are past the tagged commit, we pretty print it.		# (like 6.1.0-14595-g292a089d78d3)		if [ -n "${count}" ]; then			printf "%s%05d" "-" "${count}"		fi 		# Add -g and exactly 12 hex chars.		printf '%s%.12s' -g "$head"	fi 	if ${no_dirty}; then		return	fi 	# Check for uncommitted changes.	# This script must avoid any write attempt to the source tree, which	# might be read-only.	# You cannot use 'git describe --dirty' because it tries to create	# .git/index.lock .	# First, with git-status, but --no-optional-locks is only supported in	# git >= 2.14, so fall back to git-diff-index if it fails. Note that	# git-diff-index does not refresh the index, so it may give misleading	# results.	# See git-update-index(1), git-diff-index(1), and git-status(1).	if {		git --no-optional-locks status -uno --porcelain 2>/dev/null ||		git diff-index --name-only HEAD	} | read dummy; then		printf '%s' -dirty	fi} collect_files(){	local file res= 	for file; do		case "$file" in		*\~*)			continue			;;		esac		if test -e "$file"; then			res="$res$(cat "$file")"		fi	done	echo "$res"} if [ -z "${KERNELVERSION}" ]; then	echo "KERNELVERSION is not set" >&2	exit 1fi # localversion* files in the build and source directoryfile_localversion="$(collect_files localversion*)"if test ! "$srctree" -ef .; then	file_localversion="${file_localversion}$(collect_files "$srctree"/localversion*)"fi if ${no_local}; then	echo "${KERNELVERSION}$(scm_version --no-dirty)"	exit 0fi if ! test -e include/config/auto.conf; then	echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2	exit 1fi # version string from CONFIG_LOCALVERSIONconfig_localversion=$(sed -n 's/^CONFIG_LOCALVERSION=\(.*\)$/\1/p' include/config/auto.conf) # scm version string if not at the kernel version tag or at the file_localversionif grep -q "^CONFIG_LOCALVERSION_AUTO=y$" include/config/auto.conf; then	# full scm version string	scm_version="$(scm_version)"elif [ "${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_version="$(scm_version --short)"fi echo "${KERNELVERSION}${file_localversion}${config_localversion}${LOCALVERSION}${scm_version}"