#!/bin/sh
# This file is part of the coreboot project.
#
# Copyright (C) 2010 coresystems GmbH
# Copyright (C) 2016 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
#
# DESCR: Check that files in have valid license headers
# $1 is an optional command line parameter containing directories to check

# regex list of files and directories to exclude from the search
HEADER_EXCLUDED="\
^src/vendorcode/|\
^util/kconfig/|\
^util/romcc/tests|\
^util/romcc/results|\
Kconfig|\
\<COPYING\>|\
\<LICENSE\>|\
\<README\>|\
Changelog|\
TODO|\
EXAMPLE|\
\.txt$|\
\.jpg$|\
\.cksum$|\
\.bin$|\
\.hex$|\
\.patch$|\
_shipped$|\
/microcode-[^/]*.h$|\
/sdram-.*\.inc$|\
Makefile\.inc|\
\.fmd|\
\.cb|\
\.cfg$|\
\.spd|\
config|\
cmos\.layout|\
cmos\.default\
"

#space separated list of directories to test
if [ "$1" = "" ]; then
	HEADER_DIRS="src util"
else
	HEADER_DIRS="$1"
fi

LC_ALL=C export LC_ALL

#get initial list from git, removing HEADER_EXCLUDED files.
#make a copy to check for the old style header later.
headerlist=$(git ls-files $HEADER_DIRS | egrep -v "($HEADER_EXCLUDED)")

#update headerlist by removing files that match the license string
check_for_license() {
	if [ -n "$headerlist" ] && [ -z "$2" ]; then
		headerlist="$(grep -iL "$1" $headerlist 2>/dev/null)"
	elif [ -n "$headerlist" ]; then
		p1list="$(grep -il "$1" $headerlist 2>/dev/null)"
		p2list="$(grep -il "$2" $headerlist 2>/dev/null)"

		# Make list of files that were in both previous lists
		pbothlist="$(echo $p1list $p2list | tr ' ' "\n" | \
			sort | uniq -d)"

		# Remove all files that were in both of the previous lists
		# Note that this is unstable if we ever get any filenames
		# with spaces.
		headerlist="$(echo $headerlist $pbothlist | tr ' ' "\n" | \
			sort | uniq -u)"
	fi
}

#search the files for license headers
check_for_license "under the terms of the GNU General Public License" \
		"WITHOUT ANY WARRANTY"
check_for_license 'IS PROVIDED .*"AS IS"'
check_for_license 'IS DISTRIBUTED .*"AS IS"'
check_for_license "IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE"
check_for_license '"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES'
check_for_license 'assumes any liability or responsibility for the use'
check_for_license 'THE AUTHORS DISCLAIM.*ALL WARRANTIES WITH REGARD TO THIS SOFTWARE'
check_for_license 'No license required'

for file in $headerlist; do
	# Verify the file exists, and has content that requires a header
	# This assumes that a file that has 4 lines or fewer is not notable
	# enough to require a license.
	if [ -f "$file" ] && [ "$(wc -l < "$file")" -gt 4 ]; then
		echo "$file has no recognized license header."
	fi
done