setlocalversion

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
#
# This scripts adds local version information from git.
#
# 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
}

srctree=.
if test $# -gt 0; then
	srctree=$1
	shift
fi
if test $# -gt 0 -o ! -d "$srctree"; then
	usage
fi

scm_version()
{
	local short
	short=false

	cd "$srctree"
	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
		exact_match=$(git describe --exact-match 2>/dev/null)

		# If we are at a tagged commit (like "v2.6.30-rc6"), we print
		# it directly in the "else" branch.
		if [ -z "$exact_match" ]; then

			# If only the short version is requested, don't bother
			# running further git commands
			if $short; then
				echo "+"
				return
			fi
			# If we are past a tagged commit (like
			# "v2.6.30-rc5-302-g72357d5"), we pretty print it.
			#
			# Ensure the abbreviated sha1 has exactly 12
			# hex characters, to make the output
			# independent of git version, local
			# core.abbrev settings and/or total number of
			# objects in the current repository - passing
			# --abbrev=12 ensures a minimum of 12, and the
			# awk substr() then picks the 'g' and first 12
			# hex chars.
			if atag="$(git describe --abbrev=12 2>/dev/null)"; then
				echo "$atag" | awk -F- '{printf("%s-%05d-%s", $1, $(NF-1),substr($(NF),0,13))}'

			# If we don't have a tag at all we print -g{commitish},
			# again using exactly 12 hex chars.
			else
				head="$(echo $head | cut -c1-12)"
				printf '%s%s' -g $head
			fi
		else
			printf '%s' $exact_match
		fi

		# Check for uncommitted changes.
		# 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
		} | grep -qvE '^(.. )?scripts/package'; then
			printf '%s' -dirty
		fi

		# All done with git
		return
	else
		cat VERSION
	fi
}

scm_version