1#!/bin/bash
2#
3# Usage: configinit.sh config-spec-file [ build output dir ]
4#
5# Create a .config file from the spec file.  Run from the kernel source tree.
6# Exits with 0 if all went well, with 1 if all went well but the config
7# did not match, and some other number for other failures.
8#
9# The first argument is the .config specification file, which contains
10# desired settings, for example, "CONFIG_NO_HZ=y".  For best results,
11# this should be a full pathname.
12#
13# The second argument is a optional path to a build output directory,
14# for example, "O=/tmp/foo".  If this argument is omitted, the .config
15# file will be generated directly in the current directory.
16#
17# This program is free software; you can redistribute it and/or modify
18# it under the terms of the GNU General Public License as published by
19# the Free Software Foundation; either version 2 of the License, or
20# (at your option) any later version.
21#
22# This program is distributed in the hope that it will be useful,
23# but WITHOUT ANY WARRANTY; without even the implied warranty of
24# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25# GNU General Public License for more details.
26#
27# You should have received a copy of the GNU General Public License
28# along with this program; if not, you can access it online at
29# http://www.gnu.org/licenses/gpl-2.0.html.
30#
31# Copyright (C) IBM Corporation, 2013
32#
33# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
34
35T=${TMPDIR-/tmp}/configinit.sh.$$
36trap 'rm -rf $T' 0
37mkdir $T
38
39# Capture config spec file.
40
41c=$1
42buildloc=$2
43builddir=
44if test -n $buildloc
45then
46	if echo $buildloc | grep -q '^O='
47	then
48		builddir=`echo $buildloc | sed -e 's/^O=//'`
49		if test ! -d $builddir
50		then
51			mkdir $builddir
52		fi
53	else
54		echo Bad build directory: \"$buildloc\"
55		exit 2
56	fi
57fi
58
59sed -e 's/^\(CONFIG[0-9A-Z_]*\)=.*$/grep -v "^# \1" |/' < $c > $T/u.sh
60sed -e 's/^\(CONFIG[0-9A-Z_]*=\).*$/grep -v \1 |/' < $c >> $T/u.sh
61grep '^grep' < $T/u.sh > $T/upd.sh
62echo "cat - $c" >> $T/upd.sh
63make mrproper
64make $buildloc distclean > $builddir/Make.distclean 2>&1
65make $buildloc $TORTURE_DEFCONFIG > $builddir/Make.defconfig.out 2>&1
66mv $builddir/.config $builddir/.config.sav
67sh $T/upd.sh < $builddir/.config.sav > $builddir/.config
68cp $builddir/.config $builddir/.config.new
69yes '' | make $buildloc oldconfig > $builddir/Make.oldconfig.out 2> $builddir/Make.oldconfig.err
70
71# verify new config matches specification.
72configcheck.sh $builddir/.config $c
73
74exit 0
75