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706 lines
16 KiB
706 lines
16 KiB
#!/usr/bin/env perl |
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# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Copyright 2005-2009 - Steven Rostedt |
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# |
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# It's simple enough to figure out how this works. |
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# If not, then you can ask me at [email protected] |
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# |
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# What it does? |
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# |
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# If you have installed a Linux kernel from a distribution |
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# that turns on way too many modules than you need, and |
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# you only want the modules you use, then this program |
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# is perfect for you. |
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# |
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# It gives you the ability to turn off all the modules that are |
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# not loaded on your system. |
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# |
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# Howto: |
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# |
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# 1. Boot up the kernel that you want to stream line the config on. |
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# 2. Change directory to the directory holding the source of the |
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# kernel that you just booted. |
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# 3. Copy the configuration file to this directory as .config |
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# 4. Have all your devices that you need modules for connected and |
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# operational (make sure that their corresponding modules are loaded) |
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# 5. Run this script redirecting the output to some other file |
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# like config_strip. |
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# 6. Back up your old config (if you want too). |
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# 7. copy the config_strip file to .config |
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# 8. Run "make oldconfig" |
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# |
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# Now your kernel is ready to be built with only the modules that |
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# are loaded. |
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# |
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# Here's what I did with my Debian distribution. |
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# |
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# cd /usr/src/linux-2.6.10 |
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# cp /boot/config-2.6.10-1-686-smp .config |
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# ~/bin/streamline_config > config_strip |
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# mv .config config_sav |
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# mv config_strip .config |
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# make oldconfig |
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# |
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use warnings; |
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use strict; |
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use Getopt::Long; |
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# set the environment variable LOCALMODCONFIG_DEBUG to get |
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# debug output. |
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my $debugprint = 0; |
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$debugprint = 1 if (defined($ENV{LOCALMODCONFIG_DEBUG})); |
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sub dprint { |
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return if (!$debugprint); |
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print STDERR @_; |
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} |
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my $uname = `uname -r`; |
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chomp $uname; |
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my @searchconfigs = ( |
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{ |
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"file" => ".config", |
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"exec" => "cat", |
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}, |
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{ |
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"file" => "/proc/config.gz", |
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"exec" => "zcat", |
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}, |
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{ |
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"file" => "/boot/config-$uname", |
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"exec" => "cat", |
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}, |
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{ |
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"file" => "/boot/vmlinuz-$uname", |
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"exec" => "scripts/extract-ikconfig", |
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"test" => "scripts/extract-ikconfig", |
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}, |
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{ |
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"file" => "vmlinux", |
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"exec" => "scripts/extract-ikconfig", |
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"test" => "scripts/extract-ikconfig", |
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}, |
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{ |
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"file" => "/lib/modules/$uname/kernel/kernel/configs.ko", |
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"exec" => "scripts/extract-ikconfig", |
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"test" => "scripts/extract-ikconfig", |
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}, |
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{ |
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"file" => "kernel/configs.ko", |
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"exec" => "scripts/extract-ikconfig", |
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"test" => "scripts/extract-ikconfig", |
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}, |
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{ |
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"file" => "kernel/configs.o", |
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"exec" => "scripts/extract-ikconfig", |
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"test" => "scripts/extract-ikconfig", |
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}, |
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); |
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sub read_config { |
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foreach my $conf (@searchconfigs) { |
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my $file = $conf->{"file"}; |
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next if ( ! -f "$file"); |
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if (defined($conf->{"test"})) { |
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`$conf->{"test"} $conf->{"file"} 2>/dev/null`; |
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next if ($?); |
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} |
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my $exec = $conf->{"exec"}; |
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print STDERR "using config: '$file'\n"; |
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open(my $infile, '-|', "$exec $file") || die "Failed to run $exec $file"; |
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my @x = <$infile>; |
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close $infile; |
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return @x; |
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} |
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die "No config file found"; |
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} |
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my @config_file = read_config; |
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# Parse options |
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my $localmodconfig = 0; |
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my $localyesconfig = 0; |
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GetOptions("localmodconfig" => \$localmodconfig, |
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"localyesconfig" => \$localyesconfig); |
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# Get the build source and top level Kconfig file (passed in) |
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my $ksource = ($ARGV[0] ? $ARGV[0] : '.'); |
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my $kconfig = $ARGV[1]; |
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my $lsmod_file = $ENV{'LSMOD'}; |
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my @makefiles = `find $ksource -name Makefile -or -name Kbuild 2>/dev/null`; |
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chomp @makefiles; |
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my %depends; |
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my %selects; |
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my %prompts; |
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my %objects; |
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my %config2kfile; |
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my $var; |
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my $iflevel = 0; |
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my @ifdeps; |
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# prevent recursion |
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my %read_kconfigs; |
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sub read_kconfig { |
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my ($kconfig) = @_; |
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my $state = "NONE"; |
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my $config; |
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my $cont = 0; |
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my $line; |
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my $source = "$ksource/$kconfig"; |
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my $last_source = ""; |
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# Check for any environment variables used |
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while ($source =~ /\$\((\w+)\)/ && $last_source ne $source) { |
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my $env = $1; |
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$last_source = $source; |
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$source =~ s/\$\($env\)/$ENV{$env}/; |
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} |
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open(my $kinfile, '<', $source) || die "Can't open $kconfig"; |
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while (<$kinfile>) { |
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chomp; |
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# Make sure that lines ending with \ continue |
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if ($cont) { |
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$_ = $line . " " . $_; |
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} |
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if (s/\\$//) { |
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$cont = 1; |
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$line = $_; |
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next; |
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} |
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$cont = 0; |
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# collect any Kconfig sources |
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if (/^source\s+"?([^"]+)/) { |
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my $kconfig = $1; |
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# prevent reading twice. |
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if (!defined($read_kconfigs{$kconfig})) { |
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$read_kconfigs{$kconfig} = 1; |
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read_kconfig($kconfig); |
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} |
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next; |
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} |
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# configs found |
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if (/^\s*(menu)?config\s+(\S+)\s*$/) { |
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$state = "NEW"; |
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$config = $2; |
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$config2kfile{"CONFIG_$config"} = $kconfig; |
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# Add depends for 'if' nesting |
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for (my $i = 0; $i < $iflevel; $i++) { |
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if ($i) { |
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$depends{$config} .= " " . $ifdeps[$i]; |
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} else { |
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$depends{$config} = $ifdeps[$i]; |
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} |
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$state = "DEP"; |
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} |
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# collect the depends for the config |
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} elsif ($state eq "NEW" && /^\s*depends\s+on\s+(.*)$/) { |
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$state = "DEP"; |
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$depends{$config} = $1; |
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} elsif ($state eq "DEP" && /^\s*depends\s+on\s+(.*)$/) { |
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$depends{$config} .= " " . $1; |
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} elsif ($state eq "DEP" && /^\s*def(_(bool|tristate)|ault)\s+(\S.*)$/) { |
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my $dep = $3; |
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if ($dep !~ /^\s*(y|m|n)\s*$/) { |
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$dep =~ s/.*\sif\s+//; |
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$depends{$config} .= " " . $dep; |
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dprint "Added default depends $dep to $config\n"; |
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} |
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# Get the configs that select this config |
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} elsif ($state ne "NONE" && /^\s*select\s+(\S+)/) { |
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my $conf = $1; |
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if (defined($selects{$conf})) { |
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$selects{$conf} .= " " . $config; |
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} else { |
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$selects{$conf} = $config; |
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} |
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# configs without prompts must be selected |
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} elsif ($state ne "NONE" && /^\s*(tristate\s+\S|prompt\b)/) { |
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# note if the config has a prompt |
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$prompts{$config} = 1; |
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# Check for if statements |
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} elsif (/^if\s+(.*\S)\s*$/) { |
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my $deps = $1; |
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# remove beginning and ending non text |
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$deps =~ s/^[^a-zA-Z0-9_]*//; |
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$deps =~ s/[^a-zA-Z0-9_]*$//; |
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my @deps = split /[^a-zA-Z0-9_]+/, $deps; |
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$ifdeps[$iflevel++] = join ':', @deps; |
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} elsif (/^endif/) { |
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$iflevel-- if ($iflevel); |
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# stop on "help" and keywords that end a menu entry |
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} elsif (/^\s*(---)?help(---)?\s*$/ || /^(comment|choice|menu)\b/) { |
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$state = "NONE"; |
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} |
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} |
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close($kinfile); |
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} |
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if ($kconfig) { |
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read_kconfig($kconfig); |
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} |
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# Makefiles can use variables to define their dependencies |
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sub convert_vars { |
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my ($line, %vars) = @_; |
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my $process = ""; |
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while ($line =~ s/^(.*?)(\$\((.*?)\))//) { |
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my $start = $1; |
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my $variable = $2; |
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my $var = $3; |
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if (defined($vars{$var})) { |
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$process .= $start . $vars{$var}; |
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} else { |
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$process .= $start . $variable; |
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} |
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} |
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$process .= $line; |
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return $process; |
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} |
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# Read all Makefiles to map the configs to the objects |
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foreach my $makefile (@makefiles) { |
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my $line = ""; |
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my %make_vars; |
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open(my $infile, '<', $makefile) || die "Can't open $makefile"; |
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while (<$infile>) { |
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# if this line ends with a backslash, continue |
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chomp; |
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if (/^(.*)\\$/) { |
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$line .= $1; |
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next; |
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} |
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$line .= $_; |
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$_ = $line; |
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$line = ""; |
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my $objs; |
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# Convert variables in a line (could define configs) |
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$_ = convert_vars($_, %make_vars); |
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# collect objects after obj-$(CONFIG_FOO_BAR) |
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if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) { |
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$var = $1; |
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$objs = $2; |
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# check if variables are set |
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} elsif (/^\s*(\S+)\s*[:]?=\s*(.*\S)/) { |
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$make_vars{$1} = $2; |
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} |
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if (defined($objs)) { |
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foreach my $obj (split /\s+/,$objs) { |
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$obj =~ s/-/_/g; |
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if ($obj =~ /(.*)\.o$/) { |
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# Objects may be enabled by more than one config. |
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# Store configs in an array. |
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my @arr; |
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if (defined($objects{$1})) { |
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@arr = @{$objects{$1}}; |
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} |
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$arr[$#arr+1] = $var; |
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# The objects have a hash mapping to a reference |
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# of an array of configs. |
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$objects{$1} = \@arr; |
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} |
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} |
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} |
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} |
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close($infile); |
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} |
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my %modules; |
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my $linfile; |
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if (defined($lsmod_file)) { |
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if ( ! -f $lsmod_file) { |
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if ( -f $ENV{'objtree'}."/".$lsmod_file) { |
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$lsmod_file = $ENV{'objtree'}."/".$lsmod_file; |
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} else { |
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die "$lsmod_file not found"; |
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} |
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} |
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my $otype = ( -x $lsmod_file) ? '-|' : '<'; |
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open($linfile, $otype, $lsmod_file); |
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} else { |
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# see what modules are loaded on this system |
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my $lsmod; |
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foreach my $dir ( ("/sbin", "/bin", "/usr/sbin", "/usr/bin") ) { |
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if ( -x "$dir/lsmod" ) { |
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$lsmod = "$dir/lsmod"; |
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last; |
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} |
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} |
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if (!defined($lsmod)) { |
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# try just the path |
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$lsmod = "lsmod"; |
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} |
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open($linfile, '-|', $lsmod) || die "Can not call lsmod with $lsmod"; |
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} |
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while (<$linfile>) { |
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next if (/^Module/); # Skip the first line. |
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if (/^(\S+)/) { |
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$modules{$1} = 1; |
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} |
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} |
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close ($linfile); |
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# add to the configs hash all configs that are needed to enable |
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# a loaded module. This is a direct obj-${CONFIG_FOO} += bar.o |
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# where we know we need bar.o so we add FOO to the list. |
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my %configs; |
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foreach my $module (keys(%modules)) { |
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if (defined($objects{$module})) { |
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my @arr = @{$objects{$module}}; |
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foreach my $conf (@arr) { |
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$configs{$conf} = $module; |
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dprint "$conf added by direct ($module)\n"; |
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if ($debugprint) { |
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my $c=$conf; |
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$c =~ s/^CONFIG_//; |
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if (defined($depends{$c})) { |
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dprint " deps = $depends{$c}\n"; |
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} else { |
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dprint " no deps\n"; |
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} |
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} |
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} |
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} else { |
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# Most likely, someone has a custom (binary?) module loaded. |
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print STDERR "$module config not found!!\n"; |
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} |
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} |
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# Read the current config, and see what is enabled. We want to |
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# ignore configs that we would not enable anyway. |
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my %orig_configs; |
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my $valid = "A-Za-z_0-9"; |
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foreach my $line (@config_file) { |
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$_ = $line; |
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if (/(CONFIG_[$valid]*)=(m|y)/) { |
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$orig_configs{$1} = $2; |
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} |
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} |
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my $repeat = 1; |
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my $depconfig; |
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# |
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# Note, we do not care about operands (like: &&, ||, !) we want to add any |
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# config that is in the depend list of another config. This script does |
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# not enable configs that are not already enabled. If we come across a |
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# config A that depends on !B, we can still add B to the list of depends |
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# to keep on. If A was on in the original config, B would not have been |
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# and B would not be turned on by this script. |
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# |
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sub parse_config_depends |
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{ |
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my ($p) = @_; |
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while ($p =~ /[$valid]/) { |
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if ($p =~ /^[^$valid]*([$valid]+)/) { |
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my $conf = "CONFIG_" . $1; |
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$p =~ s/^[^$valid]*[$valid]+//; |
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# We only need to process if the depend config is a module |
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if (!defined($orig_configs{$conf}) || $orig_configs{$conf} eq "y") { |
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next; |
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} |
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if (!defined($configs{$conf})) { |
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# We must make sure that this config has its |
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# dependencies met. |
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$repeat = 1; # do again |
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dprint "$conf selected by depend $depconfig\n"; |
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$configs{$conf} = 1; |
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} |
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} else { |
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die "this should never happen"; |
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} |
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} |
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} |
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# Select is treated a bit differently than depends. We call this |
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# when a config has no prompt and requires another config to be |
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# selected. We use to just select all configs that selected this |
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# config, but found that that can balloon into enabling hundreds |
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# of configs that we do not care about. |
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# |
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# The idea is we look at all the configs that select it. If one |
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# is already in our list of configs to enable, then there's nothing |
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# else to do. If there isn't, we pick the first config that was |
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# enabled in the original config and use that. |
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sub parse_config_selects |
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{ |
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my ($config, $p) = @_; |
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my $next_config; |
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while ($p =~ /[$valid]/) { |
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if ($p =~ /^[^$valid]*([$valid]+)/) { |
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my $conf = "CONFIG_" . $1; |
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$p =~ s/^[^$valid]*[$valid]+//; |
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# Make sure that this config exists in the current .config file |
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if (!defined($orig_configs{$conf})) { |
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dprint "$conf not set for $config select\n"; |
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next; |
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} |
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# Check if something other than a module selects this config |
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if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") { |
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dprint "$conf (non module) selects config, we are good\n"; |
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# we are good with this |
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return; |
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} |
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if (defined($configs{$conf})) { |
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dprint "$conf selects $config so we are good\n"; |
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# A set config selects this config, we are good |
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return; |
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} |
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# Set this config to be selected |
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if (!defined($next_config)) { |
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$next_config = $conf; |
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} |
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} else { |
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die "this should never happen"; |
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} |
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} |
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# If no possible config selected this, then something happened. |
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if (!defined($next_config)) { |
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print STDERR "WARNING: $config is required, but nothing in the\n"; |
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print STDERR " current config selects it.\n"; |
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return; |
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} |
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# If we are here, then we found no config that is set and |
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# selects this config. Repeat. |
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$repeat = 1; |
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# Make this config need to be selected |
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$configs{$next_config} = 1; |
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dprint "$next_config selected by select $config\n"; |
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} |
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my %process_selects; |
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# loop through all configs, select their dependencies. |
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sub loop_depend { |
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$repeat = 1; |
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while ($repeat) { |
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$repeat = 0; |
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forloop: |
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foreach my $config (keys %configs) { |
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# If this config is not a module, we do not need to process it |
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if (defined($orig_configs{$config}) && $orig_configs{$config} ne "m") { |
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next forloop; |
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} |
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$config =~ s/^CONFIG_//; |
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$depconfig = $config; |
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if (defined($depends{$config})) { |
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# This config has dependencies. Make sure they are also included |
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parse_config_depends $depends{$config}; |
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} |
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# If the config has no prompt, then we need to check if a config |
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# that is enabled selected it. Or if we need to enable one. |
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if (!defined($prompts{$config}) && defined($selects{$config})) { |
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$process_selects{$config} = 1; |
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} |
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} |
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} |
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} |
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sub loop_select { |
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foreach my $config (keys %process_selects) { |
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$config =~ s/^CONFIG_//; |
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dprint "Process select $config\n"; |
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# config has no prompt and must be selected. |
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parse_config_selects $config, $selects{$config}; |
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} |
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} |
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while ($repeat) { |
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# Get the first set of configs and their dependencies. |
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loop_depend; |
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$repeat = 0; |
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# Now we need to see if we have to check selects; |
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loop_select; |
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} |
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my %setconfigs; |
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my @preserved_kconfigs; |
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if (defined($ENV{'LMC_KEEP'})) { |
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@preserved_kconfigs = split(/:/,$ENV{LMC_KEEP}); |
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} |
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sub in_preserved_kconfigs { |
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my $kconfig = $config2kfile{$_[0]}; |
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if (!defined($kconfig)) { |
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return 0; |
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} |
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foreach my $excl (@preserved_kconfigs) { |
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if($kconfig =~ /^$excl/) { |
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return 1; |
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} |
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} |
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return 0; |
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} |
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# Finally, read the .config file and turn off any module enabled that |
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# we could not find a reason to keep enabled. |
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foreach my $line (@config_file) { |
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$_ = $line; |
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|
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if (/CONFIG_IKCONFIG/) { |
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if (/# CONFIG_IKCONFIG is not set/) { |
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# 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 (in_preserved_kconfigs($1)) { |
|
dprint "Preserve config $1"; |
|
print; |
|
next; |
|
} |
|
if (defined($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"; |
|
} |
|
} |
|
|
|
# vim: softtabstop=4
|
|
|