#!/bin/sh -
#
# SPDX-License-Identifier: BSD-3-Clause
#
# Copyright (c) 1984, 1986, 1990, 1993
#	The Regents of the University of California.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the University nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#	@(#)newvers.sh	8.1 (Berkeley) 4/20/94
# $FreeBSD$

# Command line options:
#
#     -r               Reproducible build.  Do not embed directory names, user
#                      names, time stamps or other dynamic information into
#                      the output file.  This is intended to allow two builds
#                      done at different times and even by different people on
#                      different hosts to produce identical output.
#
#     -R               Reproducible build if the tree represents an unmodified
#                      checkout from a version control system.  Metadata is
#                      included if the tree is modified.

TYPE="FreeBSD"
REVISION="13.0"
BRANCH=${BRANCH_OVERRIDE:-CURRENT}
RELEASE="${REVISION}-${BRANCH}"
VERSION="${TYPE} ${RELEASE}"

#
# findvcs dir
#	Looks up directory dir at world root and up the filesystem
#
findvcs()
{
	local savedir

	savedir=$(pwd)
	cd ${SYSDIR}/..
	while [ $(pwd) != "/" ]; do
		if [ -e "./$1" ]; then
			VCSTOP=$(pwd)
			VCSDIR=${VCSTOP}"/$1"
			cd ${savedir}
			return 0
		fi
		cd ..
	done
	cd ${savedir}
	return 1
}

git_tree_modified()
{
	# git diff-index lists both files that are known to have changes as
	# well as those with metadata that does not match what is recorded in
	# git's internal state.  The latter case is indicated by an all-zero
	# destination file hash.

	local fifo

	fifo=$(mktemp -u)
	mkfifo -m 600 $fifo || exit 1
	$git_cmd --work-tree=${VCSTOP} diff-index HEAD > $fifo &
	while read smode dmode ssha dsha status file; do
		if ! expr $dsha : '^00*$' >/dev/null; then
			rm $fifo
			return 0
		fi
		if ! $git_cmd --work-tree=${VCSTOP} diff --quiet -- "${file}"; then
			rm $fifo
			return 0
		fi
	done < $fifo
	# No files with content differences.
	rm $fifo
	return 1
}


if [ -z "${SYSDIR}" ]; then
    SYSDIR=$(dirname $0)/..
fi

RELDATE=$(awk '/__FreeBSD_version.*propagated to newvers/ {print $3}' \
	      ${PARAMFILE:-${SYSDIR}/sys/param.h})

if [ -r "${SYSDIR}/../COPYRIGHT" ]; then
	year=$(sed -Ee '/^Copyright .* The FreeBSD Project/!d;s/^.*1992-([0-9]*) .*$/\1/g' ${SYSDIR}/../COPYRIGHT)
else
	year=$(date +%Y)
fi
# look for copyright template
b=share/examples/etc/bsd-style-copyright
for bsd_copyright in ../$b ../../$b ../../../$b /usr/src/$b /usr/$b
do
	if [ -r "$bsd_copyright" ]; then
		COPYRIGHT=`sed \
		    -e "s/\[year\]/1992-$year/" \
		    -e 's/\[your name here\]\.* /The FreeBSD Project./' \
		    -e 's/\[your name\]\.*/The FreeBSD Project./' \
		    -e '/\[id for your version control system, if any\]/d' \
		    $bsd_copyright` 
		break
	fi
done

# no copyright found, use a dummy
if [ -z "$COPYRIGHT" ]; then
	COPYRIGHT="/*-
 * Copyright (c) 1992-$year The FreeBSD Project.
 *
 */"
fi

# add newline
COPYRIGHT="$COPYRIGHT
"

# VARS_ONLY means no files should be generated, this is just being
# included.
[ -n "$VARS_ONLY" ] && return 0

LC_ALL=C; export LC_ALL
if [ ! -r version ]
then
	echo 0 > version
fi

touch version
v=`cat version`
u=${USER:-root}
d=`pwd`
h=${HOSTNAME:-`hostname`}
if [ -n "$SOURCE_DATE_EPOCH" ]; then
	if ! t=`date -r $SOURCE_DATE_EPOCH 2>/dev/null`; then
		echo "Invalid SOURCE_DATE_EPOCH" >&2
		exit 1
	fi
else
	t=`date`
fi
i=`${MAKE:-make} -V KERN_IDENT`
compiler_v=$($(${MAKE:-make} -V CC) -v 2>&1 | grep -w 'version')

for dir in /usr/bin /usr/local/bin; do
	if [ ! -z "${svnversion}" ] ; then
		break
	fi
	if [ -x "${dir}/svnversion" ] && [ -z ${svnversion} ] ; then
		# Run svnversion from ${dir} on this script; if return code
		# is not zero, the checkout might not be compatible with the
		# svnversion being used.
		${dir}/svnversion $(realpath ${0}) >/dev/null 2>&1
		if [ $? -eq 0 ]; then
			svnversion=${dir}/svnversion
			break
		fi
	fi
done

if [ -z "${svnversion}" ] && [ -x /usr/bin/svnliteversion ] ; then
	/usr/bin/svnliteversion $(realpath ${0}) >/dev/null 2>&1
	if [ $? -eq 0 ]; then
		svnversion=/usr/bin/svnliteversion
	else
		svnversion=
	fi
fi

if findvcs .git; then
	for dir in /usr/bin /usr/local/bin; do
		if [ -x "${dir}/git" ] ; then
			git_cmd="${dir}/git -c help.autocorrect=0 --git-dir=${VCSDIR}"
			break
		fi
	done
fi

if findvcs .hg; then
	for dir in /usr/bin /usr/local/bin; do
		if [ -x "${dir}/hg" ] ; then
			hg_cmd="${dir}/hg -R ${VCSDIR}"
			break
		fi
	done
fi

if [ -n "$svnversion" ] ; then
	svn=`cd ${SYSDIR} && $svnversion 2>/dev/null`
	case "$svn" in
	[0-9]*[MSP]|*:*)
		svn=" r${svn}"
		modified=true
		;;
	[0-9]*)
		svn=" r${svn}"
		;;
	*)
		unset svn
		;;
	esac
fi

if [ -n "$git_cmd" ] ; then
	git=`$git_cmd rev-parse --verify --short HEAD 2>/dev/null`
	gitsvn=`$git_cmd svn find-rev $git 2>/dev/null`
	if [ -n "$gitsvn" ] ; then
		svn=" r${gitsvn}"
		git="=${git}"
	else
#		Log searches are limited to 10k commits to speed up failures.
#		We assume that if a tree is more than 10k commits out-of-sync
#		with FreeBSD, it has forked the the OS and the SVN rev no
#		longer matters.
		gitsvn=`$git_cmd log -n 10000 |
		    grep '^    git-svn-id:' | head -1 | \
		    sed -n 's/^.*@\([0-9][0-9]*\).*$/\1/p'`
		if [ -z "$gitsvn" ] ; then
			gitsvn=`$git_cmd log -n 10000 --format='format:%N' | \
			     grep '^svn ' | head -1 | \
			     sed -n 's/^.*revision=\([0-9][0-9]*\).*$/\1/p'`
		fi
		if [ -n "$gitsvn" ] ; then
			svn=" r${gitsvn}"
			git="+${git}"
		else
			git=" ${git}"
		fi
	fi
	git_b=`$git_cmd rev-parse --abbrev-ref HEAD`
	if [ -n "$git_b" ] ; then
		git="${git}(${git_b})"
	fi
	if git_tree_modified; then
		git="${git}-dirty"
		modified=true
	fi
fi

if [ -n "$hg_cmd" ] ; then
	hg=`$hg_cmd id 2>/dev/null`
	hgsvn=`$hg_cmd svn info 2>/dev/null | \
		awk -F': ' '/Revision/ { print $2 }'`
	if [ -n "$hgsvn" ] ; then
		svn=" r${hgsvn}"
	fi
	if [ -n "$hg" ] ; then
		hg=" ${hg}"
	fi
fi

include_metadata=true
while getopts rR opt; do
	case "$opt" in
	r)
		include_metadata=
		;;
	R)
		if [ -z "${modified}" ]; then
			include_metadata=
		fi
	esac
done
shift $((OPTIND - 1))

if [ -z "${include_metadata}" ]; then
	VERINFO="${VERSION}${svn}${git}${hg} ${i}"
	VERSTR="${VERINFO}\\n"
else
	VERINFO="${VERSION} #${v}${svn}${git}${hg}: ${t}"
	VERSTR="${VERINFO}\\n    ${u}@${h}:${d}\\n"
fi

vers_content_new=$(cat << EOF
$COPYRIGHT
#define SCCSSTR "@(#)${VERINFO}"
#define VERSTR "${VERSTR}"
#define RELSTR "${RELEASE}"

char sccs[sizeof(SCCSSTR) > 128 ? sizeof(SCCSSTR) : 128] = SCCSSTR;
char version[sizeof(VERSTR) > 256 ? sizeof(VERSTR) : 256] = VERSTR;
char compiler_version[] = "${compiler_v}";
char ostype[] = "${TYPE}";
char osrelease[sizeof(RELSTR) > 32 ? sizeof(RELSTR) : 32] = RELSTR;
int osreldate = ${RELDATE};
char kern_ident[] = "${i}";
EOF
)
vers_content_old=$(cat vers.c 2>/dev/null || true)
if [ "$vers_content_new" != "$vers_content_old" ]; then
	echo "$vers_content_new" > vers.c
fi

echo $((v + 1)) > version