| #!/usr/bin/perl -w |
| # |
| # 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 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/) { |
| # 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"; |
| } |
| } |