683 lines
16 KiB
Perl
Executable File
683 lines
16 KiB
Perl
Executable File
#!/usr/bin/env perl
|
|
#
|
|
# Copyright 2005-2009 - Steven Rostedt
|
|
# Licensed under the terms of the GNU GPL License version 2
|
|
#
|
|
# It's simple enough to figure out how this works.
|
|
# If not, then you can ask me at stripconfig@goodmis.org
|
|
#
|
|
# What it does?
|
|
#
|
|
# If you have installed a Linux kernel from a distribution
|
|
# that turns on way too many modules than you need, and
|
|
# you only want the modules you use, then this program
|
|
# is perfect for you.
|
|
#
|
|
# It gives you the ability to turn off all the modules that are
|
|
# not loaded on your system.
|
|
#
|
|
# Howto:
|
|
#
|
|
# 1. Boot up the kernel that you want to stream line the config on.
|
|
# 2. Change directory to the directory holding the source of the
|
|
# kernel that you just booted.
|
|
# 3. Copy the configuraton file to this directory as .config
|
|
# 4. Have all your devices that you need modules for connected and
|
|
# operational (make sure that their corresponding modules are loaded)
|
|
# 5. Run this script redirecting the output to some other file
|
|
# like config_strip.
|
|
# 6. Back up your old config (if you want too).
|
|
# 7. copy the config_strip file to .config
|
|
# 8. Run "make oldconfig"
|
|
#
|
|
# Now your kernel is ready to be built with only the modules that
|
|
# are loaded.
|
|
#
|
|
# Here's what I did with my Debian distribution.
|
|
#
|
|
# cd /usr/src/linux-2.6.10
|
|
# cp /boot/config-2.6.10-1-686-smp .config
|
|
# ~/bin/streamline_config > config_strip
|
|
# mv .config config_sav
|
|
# mv config_strip .config
|
|
# make oldconfig
|
|
#
|
|
use warnings;
|
|
use strict;
|
|
use Getopt::Long;
|
|
|
|
# set the environment variable LOCALMODCONFIG_DEBUG to get
|
|
# debug output.
|
|
my $debugprint = 0;
|
|
$debugprint = 1 if (defined($ENV{LOCALMODCONFIG_DEBUG}));
|
|
|
|
sub dprint {
|
|
return if (!$debugprint);
|
|
print STDERR @_;
|
|
}
|
|
|
|
my $config = ".config";
|
|
|
|
my $uname = `uname -r`;
|
|
chomp $uname;
|
|
|
|
my @searchconfigs = (
|
|
{
|
|
"file" => ".config",
|
|
"exec" => "cat",
|
|
},
|
|
{
|
|
"file" => "/proc/config.gz",
|
|
"exec" => "zcat",
|
|
},
|
|
{
|
|
"file" => "/boot/config-$uname",
|
|
"exec" => "cat",
|
|
},
|
|
{
|
|
"file" => "/boot/vmlinuz-$uname",
|
|
"exec" => "scripts/extract-ikconfig",
|
|
"test" => "scripts/extract-ikconfig",
|
|
},
|
|
{
|
|
"file" => "vmlinux",
|
|
"exec" => "scripts/extract-ikconfig",
|
|
"test" => "scripts/extract-ikconfig",
|
|
},
|
|
{
|
|
"file" => "/lib/modules/$uname/kernel/kernel/configs.ko",
|
|
"exec" => "scripts/extract-ikconfig",
|
|
"test" => "scripts/extract-ikconfig",
|
|
},
|
|
{
|
|
"file" => "kernel/configs.ko",
|
|
"exec" => "scripts/extract-ikconfig",
|
|
"test" => "scripts/extract-ikconfig",
|
|
},
|
|
{
|
|
"file" => "kernel/configs.o",
|
|
"exec" => "scripts/extract-ikconfig",
|
|
"test" => "scripts/extract-ikconfig",
|
|
},
|
|
);
|
|
|
|
sub read_config {
|
|
foreach my $conf (@searchconfigs) {
|
|
my $file = $conf->{"file"};
|
|
|
|
next if ( ! -f "$file");
|
|
|
|
if (defined($conf->{"test"})) {
|
|
`$conf->{"test"} $conf->{"file"} 2>/dev/null`;
|
|
next if ($?);
|
|
}
|
|
|
|
my $exec = $conf->{"exec"};
|
|
|
|
print STDERR "using config: '$file'\n";
|
|
|
|
open(my $infile, '-|', "$exec $file") || die "Failed to run $exec $file";
|
|
my @x = <$infile>;
|
|
close $infile;
|
|
return @x;
|
|
}
|
|
die "No config file found";
|
|
}
|
|
|
|
my @config_file = read_config;
|
|
|
|
# Parse options
|
|
my $localmodconfig = 0;
|
|
my $localyesconfig = 0;
|
|
|
|
GetOptions("localmodconfig" => \$localmodconfig,
|
|
"localyesconfig" => \$localyesconfig);
|
|
|
|
# Get the build source and top level Kconfig file (passed in)
|
|
my $ksource = ($ARGV[0] ? $ARGV[0] : '.');
|
|
my $kconfig = $ARGV[1];
|
|
my $lsmod_file = $ENV{'LSMOD'};
|
|
|
|
my @makefiles = `find $ksource -name Makefile -or -name Kbuild 2>/dev/null`;
|
|
chomp @makefiles;
|
|
|
|
my %depends;
|
|
my %selects;
|
|
my %prompts;
|
|
my %objects;
|
|
my $var;
|
|
my $iflevel = 0;
|
|
my @ifdeps;
|
|
|
|
# prevent recursion
|
|
my %read_kconfigs;
|
|
|
|
sub read_kconfig {
|
|
my ($kconfig) = @_;
|
|
|
|
my $state = "NONE";
|
|
my $config;
|
|
|
|
my $cont = 0;
|
|
my $line;
|
|
|
|
my $source = "$ksource/$kconfig";
|
|
my $last_source = "";
|
|
|
|
# Check for any environment variables used
|
|
while ($source =~ /\$(\w+)/ && $last_source ne $source) {
|
|
my $env = $1;
|
|
$last_source = $source;
|
|
$source =~ s/\$$env/$ENV{$env}/;
|
|
}
|
|
|
|
open(my $kinfile, '<', $source) || die "Can't open $kconfig";
|
|
while (<$kinfile>) {
|
|
chomp;
|
|
|
|
# Make sure that lines ending with \ continue
|
|
if ($cont) {
|
|
$_ = $line . " " . $_;
|
|
}
|
|
|
|
if (s/\\$//) {
|
|
$cont = 1;
|
|
$line = $_;
|
|
next;
|
|
}
|
|
|
|
$cont = 0;
|
|
|
|
# collect any Kconfig sources
|
|
if (/^source\s+"?([^"]+)/) {
|
|
my $kconfig = $1;
|
|
# prevent reading twice.
|
|
if (!defined($read_kconfigs{$kconfig})) {
|
|
$read_kconfigs{$kconfig} = 1;
|
|
read_kconfig($kconfig);
|
|
}
|
|
next;
|
|
}
|
|
|
|
# configs found
|
|
if (/^\s*(menu)?config\s+(\S+)\s*$/) {
|
|
$state = "NEW";
|
|
$config = $2;
|
|
|
|
# Add depends for 'if' nesting
|
|
for (my $i = 0; $i < $iflevel; $i++) {
|
|
if ($i) {
|
|
$depends{$config} .= " " . $ifdeps[$i];
|
|
} else {
|
|
$depends{$config} = $ifdeps[$i];
|
|
}
|
|
$state = "DEP";
|
|
}
|
|
|
|
# collect the depends for the config
|
|
} elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) {
|
|
$state = "DEP";
|
|
$depends{$config} = $1;
|
|
} elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) {
|
|
$depends{$config} .= " " . $1;
|
|
} elsif ($state eq "DEP" && /^\s*def(_(bool|tristate)|ault)\s+(\S.*)$/) {
|
|
my $dep = $3;
|
|
if ($dep !~ /^\s*(y|m|n)\s*$/) {
|
|
$dep =~ s/.*\sif\s+//;
|
|
$depends{$config} .= " " . $dep;
|
|
dprint "Added default depends $dep to $config\n";
|
|
}
|
|
|
|
# Get the configs that select this config
|
|
} elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) {
|
|
my $conf = $1;
|
|
if (defined($selects{$conf})) {
|
|
$selects{$conf} .= " " . $config;
|
|
} else {
|
|
$selects{$conf} = $config;
|
|
}
|
|
|
|
# configs without prompts must be selected
|
|
} elsif ($state ne "NONE" && /^\s*(tristate\s+\S|prompt\b)/) {
|
|
# note if the config has a prompt
|
|
$prompts{$config} = 1;
|
|
|
|
# Check for if statements
|
|
} elsif (/^if\s+(.*\S)\s*$/) {
|
|
my $deps = $1;
|
|
# remove beginning and ending non text
|
|
$deps =~ s/^[^a-zA-Z0-9_]*//;
|
|
$deps =~ s/[^a-zA-Z0-9_]*$//;
|
|
|
|
my @deps = split /[^a-zA-Z0-9_]+/, $deps;
|
|
|
|
$ifdeps[$iflevel++] = join ':', @deps;
|
|
|
|
} elsif (/^endif/) {
|
|
|
|
$iflevel-- if ($iflevel);
|
|
|
|
# stop on "help" and keywords that end a menu entry
|
|
} elsif (/^\s*(---)?help(---)?\s*$/ || /^(comment|choice|menu)\b/) {
|
|
$state = "NONE";
|
|
}
|
|
}
|
|
close($kinfile);
|
|
}
|
|
|
|
if ($kconfig) {
|
|
read_kconfig($kconfig);
|
|
}
|
|
|
|
# Makefiles can use variables to define their dependencies
|
|
sub convert_vars {
|
|
my ($line, %vars) = @_;
|
|
|
|
my $process = "";
|
|
|
|
while ($line =~ s/^(.*?)(\$\((.*?)\))//) {
|
|
my $start = $1;
|
|
my $variable = $2;
|
|
my $var = $3;
|
|
|
|
if (defined($vars{$var})) {
|
|
$process .= $start . $vars{$var};
|
|
} else {
|
|
$process .= $start . $variable;
|
|
}
|
|
}
|
|
|
|
$process .= $line;
|
|
|
|
return $process;
|
|
}
|
|
|
|
# Read all Makefiles to map the configs to the objects
|
|
foreach my $makefile (@makefiles) {
|
|
|
|
my $line = "";
|
|
my %make_vars;
|
|
|
|
open(my $infile, '<', $makefile) || die "Can't open $makefile";
|
|
while (<$infile>) {
|
|
# if this line ends with a backslash, continue
|
|
chomp;
|
|
if (/^(.*)\\$/) {
|
|
$line .= $1;
|
|
next;
|
|
}
|
|
|
|
$line .= $_;
|
|
$_ = $line;
|
|
$line = "";
|
|
|
|
my $objs;
|
|
|
|
# Convert variables in a line (could define configs)
|
|
$_ = convert_vars($_, %make_vars);
|
|
|
|
# collect objects after obj-$(CONFIG_FOO_BAR)
|
|
if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) {
|
|
$var = $1;
|
|
$objs = $2;
|
|
|
|
# check if variables are set
|
|
} elsif (/^\s*(\S+)\s*[:]?=\s*(.*\S)/) {
|
|
$make_vars{$1} = $2;
|
|
}
|
|
if (defined($objs)) {
|
|
foreach my $obj (split /\s+/,$objs) {
|
|
$obj =~ s/-/_/g;
|
|
if ($obj =~ /(.*)\.o$/) {
|
|
# Objects may be enabled by more than one config.
|
|
# Store configs in an array.
|
|
my @arr;
|
|
|
|
if (defined($objects{$1})) {
|
|
@arr = @{$objects{$1}};
|
|
}
|
|
|
|
$arr[$#arr+1] = $var;
|
|
|
|
# The objects have a hash mapping to a reference
|
|
# of an array of configs.
|
|
$objects{$1} = \@arr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
close($infile);
|
|
}
|
|
|
|
my %modules;
|
|
my $linfile;
|
|
|
|
if (defined($lsmod_file)) {
|
|
if ( ! -f $lsmod_file) {
|
|
if ( -f $ENV{'objtree'}."/".$lsmod_file) {
|
|
$lsmod_file = $ENV{'objtree'}."/".$lsmod_file;
|
|
} else {
|
|
die "$lsmod_file not found";
|
|
}
|
|
}
|
|
|
|
my $otype = ( -x $lsmod_file) ? '-|' : '<';
|
|
open($linfile, $otype, $lsmod_file);
|
|
|
|
} else {
|
|
|
|
# see what modules are loaded on this system
|
|
my $lsmod;
|
|
|
|
foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) {
|
|
if ( -x "$dir/lsmod" ) {
|
|
$lsmod = "$dir/lsmod";
|
|
last;
|
|
}
|
|
}
|
|
if (!defined($lsmod)) {
|
|
# try just the path
|
|
$lsmod = "lsmod";
|
|
}
|
|
|
|
open($linfile, '-|', $lsmod) || die "Can not call lsmod with $lsmod";
|
|
}
|
|
|
|
while (<$linfile>) {
|
|
next if (/^Module/); # Skip the first line.
|
|
if (/^(\S+)/) {
|
|
$modules{$1} = 1;
|
|
}
|
|
}
|
|
close ($linfile);
|
|
|
|
# add to the configs hash all configs that are needed to enable
|
|
# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o
|
|
# where we know we need bar.o so we add FOO to the list.
|
|
my %configs;
|
|
foreach my $module (keys(%modules)) {
|
|
if (defined($objects{$module})) {
|
|
my @arr = @{$objects{$module}};
|
|
foreach my $conf (@arr) {
|
|
$configs{$conf} = $module;
|
|
dprint "$conf added by direct ($module)\n";
|
|
if ($debugprint) {
|
|
my $c=$conf;
|
|
$c =~ s/^CONFIG_//;
|
|
if (defined($depends{$c})) {
|
|
dprint " deps = $depends{$c}\n";
|
|
} else {
|
|
dprint " no deps\n";
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
# Most likely, someone has a custom (binary?) module loaded.
|
|
print STDERR "$module config not found!!\n";
|
|
}
|
|
}
|
|
|
|
# Read the current config, and see what is enabled. We want to
|
|
# ignore configs that we would not enable anyway.
|
|
|
|
my %orig_configs;
|
|
my $valid = "A-Za-z_0-9";
|
|
|
|
foreach my $line (@config_file) {
|
|
$_ = $line;
|
|
|
|
if (/(CONFIG_[$valid]*)=(m|y)/) {
|
|
$orig_configs{$1} = $2;
|
|
}
|
|
}
|
|
|
|
my $repeat = 1;
|
|
|
|
my $depconfig;
|
|
|
|
#
|
|
# Note, we do not care about operands (like: &&, ||, !) we want to add any
|
|
# config that is in the depend list of another config. This script does
|
|
# not enable configs that are not already enabled. If we come across a
|
|
# config A that depends on !B, we can still add B to the list of depends
|
|
# to keep on. If A was on in the original config, B would not have been
|
|
# and B would not be turned on by this script.
|
|
#
|
|
sub parse_config_depends
|
|
{
|
|
my ($p) = @_;
|
|
|
|
while ($p =~ /[$valid]/) {
|
|
|
|
if ($p =~ /^[^$valid]*([$valid]+)/) {
|
|
my $conf = "CONFIG_" . $1;
|
|
|
|
$p =~ s/^[^$valid]*[$valid]+//;
|
|
|
|
# We only need to process if the depend config is a module
|
|
if (!defined($orig_configs{$conf}) || $orig_configs{$conf} eq "y") {
|
|
next;
|
|
}
|
|
|
|
if (!defined($configs{$conf})) {
|
|
# We must make sure that this config has its
|
|
# dependencies met.
|
|
$repeat = 1; # do again
|
|
dprint "$conf selected by depend $depconfig\n";
|
|
$configs{$conf} = 1;
|
|
}
|
|
} else {
|
|
die "this should never happen";
|
|
}
|
|
}
|
|
}
|
|
|
|
# Select is treated a bit differently than depends. We call this
|
|
# when a config has no prompt and requires another config to be
|
|
# selected. We use to just select all configs that selected this
|
|
# config, but found that that can balloon into enabling hundreds
|
|
# of configs that we do not care about.
|
|
#
|
|
# The idea is we look at all the configs that select it. If one
|
|
# is already in our list of configs to enable, then there's nothing
|
|
# else to do. If there isn't, we pick the first config that was
|
|
# enabled in the orignal config and use that.
|
|
sub parse_config_selects
|
|
{
|
|
my ($config, $p) = @_;
|
|
|
|
my $next_config;
|
|
|
|
while ($p =~ /[$valid]/) {
|
|
|
|
if ($p =~ /^[^$valid]*([$valid]+)/) {
|
|
my $conf = "CONFIG_" . $1;
|
|
|
|
$p =~ s/^[^$valid]*[$valid]+//;
|
|
|
|
# Make sure that this config exists in the current .config file
|
|
if (!defined($orig_configs{$conf})) {
|
|
dprint "$conf not set for $config select\n";
|
|
next;
|
|
}
|
|
|
|
# Check if something other than a module selects this config
|
|
if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") {
|
|
dprint "$conf (non module) selects config, we are good\n";
|
|
# we are good with this
|
|
return;
|
|
}
|
|
if (defined($configs{$conf})) {
|
|
dprint "$conf selects $config so we are good\n";
|
|
# A set config selects this config, we are good
|
|
return;
|
|
}
|
|
# Set this config to be selected
|
|
if (!defined($next_config)) {
|
|
$next_config = $conf;
|
|
}
|
|
} else {
|
|
die "this should never happen";
|
|
}
|
|
}
|
|
|
|
# If no possible config selected this, then something happened.
|
|
if (!defined($next_config)) {
|
|
print STDERR "WARNING: $config is required, but nothing in the\n";
|
|
print STDERR " current config selects it.\n";
|
|
return;
|
|
}
|
|
|
|
# If we are here, then we found no config that is set and
|
|
# selects this config. Repeat.
|
|
$repeat = 1;
|
|
# Make this config need to be selected
|
|
$configs{$next_config} = 1;
|
|
dprint "$next_config selected by select $config\n";
|
|
}
|
|
|
|
my %process_selects;
|
|
|
|
# loop through all configs, select their dependencies.
|
|
sub loop_depend {
|
|
$repeat = 1;
|
|
|
|
while ($repeat) {
|
|
$repeat = 0;
|
|
|
|
forloop:
|
|
foreach my $config (keys %configs) {
|
|
|
|
# If this config is not a module, we do not need to process it
|
|
if (defined($orig_configs{$config}) && $orig_configs{$config} ne "m") {
|
|
next forloop;
|
|
}
|
|
|
|
$config =~ s/^CONFIG_//;
|
|
$depconfig = $config;
|
|
|
|
if (defined($depends{$config})) {
|
|
# This config has dependencies. Make sure they are also included
|
|
parse_config_depends $depends{$config};
|
|
}
|
|
|
|
# If the config has no prompt, then we need to check if a config
|
|
# that is enabled selected it. Or if we need to enable one.
|
|
if (!defined($prompts{$config}) && defined($selects{$config})) {
|
|
$process_selects{$config} = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
sub loop_select {
|
|
|
|
foreach my $config (keys %process_selects) {
|
|
$config =~ s/^CONFIG_//;
|
|
|
|
dprint "Process select $config\n";
|
|
|
|
# config has no prompt and must be selected.
|
|
parse_config_selects $config, $selects{$config};
|
|
}
|
|
}
|
|
|
|
while ($repeat) {
|
|
# Get the first set of configs and their dependencies.
|
|
loop_depend;
|
|
|
|
$repeat = 0;
|
|
|
|
# Now we need to see if we have to check selects;
|
|
loop_select;
|
|
}
|
|
|
|
my %setconfigs;
|
|
|
|
# Finally, read the .config file and turn off any module enabled that
|
|
# we could not find a reason to keep enabled.
|
|
foreach my $line (@config_file) {
|
|
$_ = $line;
|
|
|
|
if (/CONFIG_IKCONFIG/) {
|
|
if (/# CONFIG_IKCONFIG is not set/) {
|
|
# enable IKCONFIG at least as a module
|
|
print "CONFIG_IKCONFIG=m\n";
|
|
# don't ask about PROC
|
|
print "# CONFIG_IKCONFIG_PROC is not set\n";
|
|
} else {
|
|
print;
|
|
}
|
|
next;
|
|
}
|
|
|
|
if (/CONFIG_MODULE_SIG_KEY="(.+)"/) {
|
|
my $orig_cert = $1;
|
|
my $default_cert = "certs/signing_key.pem";
|
|
|
|
# Check that the logic in this script still matches the one in Kconfig
|
|
if (!defined($depends{"MODULE_SIG_KEY"}) ||
|
|
$depends{"MODULE_SIG_KEY"} !~ /"\Q$default_cert\E"/) {
|
|
print STDERR "WARNING: MODULE_SIG_KEY assertion failure, ",
|
|
"update needed to ", __FILE__, " line ", __LINE__, "\n";
|
|
print;
|
|
} elsif ($orig_cert ne $default_cert && ! -f $orig_cert) {
|
|
print STDERR "Module signature verification enabled but ",
|
|
"module signing key \"$orig_cert\" not found. Resetting ",
|
|
"signing key to default value.\n";
|
|
print "CONFIG_MODULE_SIG_KEY=\"$default_cert\"\n";
|
|
} else {
|
|
print;
|
|
}
|
|
next;
|
|
}
|
|
|
|
if (/CONFIG_SYSTEM_TRUSTED_KEYS="(.+)"/) {
|
|
my $orig_keys = $1;
|
|
|
|
if (! -f $orig_keys) {
|
|
print STDERR "System keyring enabled but keys \"$orig_keys\" ",
|
|
"not found. Resetting keys to default value.\n";
|
|
print "CONFIG_SYSTEM_TRUSTED_KEYS=\"\"\n";
|
|
} else {
|
|
print;
|
|
}
|
|
next;
|
|
}
|
|
|
|
if (/^(CONFIG.*)=(m|y)/) {
|
|
if (defined($configs{$1})) {
|
|
if ($localyesconfig) {
|
|
$setconfigs{$1} = 'y';
|
|
print "$1=y\n";
|
|
next;
|
|
} else {
|
|
$setconfigs{$1} = $2;
|
|
}
|
|
} elsif ($2 eq "m") {
|
|
print "# $1 is not set\n";
|
|
next;
|
|
}
|
|
}
|
|
print;
|
|
}
|
|
|
|
# Integrity check, make sure all modules that we want enabled do
|
|
# indeed have their configs set.
|
|
loop:
|
|
foreach my $module (keys(%modules)) {
|
|
if (defined($objects{$module})) {
|
|
my @arr = @{$objects{$module}};
|
|
foreach my $conf (@arr) {
|
|
if (defined($setconfigs{$conf})) {
|
|
next loop;
|
|
}
|
|
}
|
|
print STDERR "module $module did not have configs";
|
|
foreach my $conf (@arr) {
|
|
print STDERR " " , $conf;
|
|
}
|
|
print STDERR "\n";
|
|
}
|
|
}
|