1#!/bin/sh
2#
3# sh 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
17echo configinit.sh $*
18
19T=/tmp/configinit.sh.$$
20trap 'rm -rf $T' 0
21mkdir $T
22
23# Capture config spec file.
24
25c=$1
26buildloc=$2
27builddir=
28if test -n $buildloc
29then
30	if echo $buildloc | grep -q '^O='
31	then
32		builddir=`echo $buildloc | sed -e 's/^O=//'`
33		if test ! -d $builddir
34		then
35			mkdir $builddir
36		fi
37	else
38		echo Bad build directory: \"$builddir\"
39		exit 2
40	fi
41fi
42
43sed -e 's/^\(CONFIG[0-9A-Z_]*\)=.*$/grep -v "^# \1" |/' < $c > $T/u.sh
44sed -e 's/^\(CONFIG[0-9A-Z_]*=\).*$/grep -v \1 |/' < $c >> $T/u.sh
45grep '^grep' < $T/u.sh > $T/upd.sh
46echo "cat - $c" >> $T/upd.sh
47make mrproper
48make $buildloc distclean > $builddir/Make.distclean 2>&1
49make $buildloc defconfig > $builddir/Make.defconfig.out 2>&1
50mv $builddir/.config $builddir/.config.sav
51sh $T/upd.sh < $builddir/.config.sav > $builddir/.config
52cp $builddir/.config $builddir/.config.new
53yes '' | make $buildloc oldconfig > $builddir/Make.modconfig.out 2>&1
54
55# verify new config matches specification.
56
57sed -e 's/"//g' < $c > $T/c
58sed -e 's/"//g' < $builddir/.config > $T/.config
59sed -e 's/\(.*\)=n/# \1 is not set/' -e 's/^#CHECK#//' < $c |
60awk	'
61	{
62		print "if grep -q \"" $0 "\" < '"$T/.config"'";
63		print "then";
64		print "\t:";
65		print "else";
66		if ($1 == "#") {
67			print "\tif grep -q \"" $2 "\" < '"$T/.config"'";
68			print "\tthen";
69			print "\t\techo \":" $2 ": improperly set\"";
70			print "\telse";
71			print "\t\t:";
72			print "\tfi";
73		} else {
74			print "\techo \":" $0 ": improperly set\"";
75		}
76		print "fi";
77	}' | sh > $T/diagnostics
78if test -s $T/diagnostics
79then
80	cat $T/diagnostics
81	exit 1
82fi
83exit 0
84