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