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184d735707
This will be used to filter out some autogenerated config values from the kernel config files Signed-off-by: Felix Fietkau <nbd@nbd.name>
190 lines
3.8 KiB
Perl
Executable File
190 lines
3.8 KiB
Perl
Executable File
#!/usr/bin/env perl
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#
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# Copyright (C) 2006 Felix Fietkau <nbd@nbd.name>
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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use warnings;
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use strict;
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my @arg;
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my $PREFIX = "CONFIG_";
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sub set_config($$$$) {
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my $config = shift;
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my $idx = shift;
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my $newval = shift;
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my $mod_plus = shift;
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if (!defined($config->{$idx}) or !$mod_plus or
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$config->{$idx} eq '#undef' or $newval eq 'y') {
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$config->{$idx} = $newval;
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}
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}
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sub load_config($$) {
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my $file = shift;
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my $mod_plus = shift;
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my %config;
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open FILE, "$file" or die "can't open file '$file'";
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while (<FILE>) {
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chomp;
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/^$PREFIX(.+?)=(.+)/ and do {
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set_config(\%config, $1, $2, $mod_plus);
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next;
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};
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/^# $PREFIX(.+?) is not set/ and do {
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set_config(\%config, $1, "#undef", $mod_plus);
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next;
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};
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/^#/ and next;
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/^(.+)$/ and warn "WARNING: can't parse line: $1\n";
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}
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return \%config;
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}
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sub config_and($$) {
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my $cfg1 = shift;
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my $cfg2 = shift;
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my %config;
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foreach my $config (keys %$cfg1) {
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my $val1 = $cfg1->{$config};
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my $val2 = $cfg2->{$config};
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$val2 and ($val1 eq $val2) and do {
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$config{$config} = $val1;
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};
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}
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return \%config;
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}
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sub config_add($$$) {
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my $cfg1 = shift;
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my $cfg2 = shift;
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my $mod_plus = shift;
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my %config;
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for ($cfg1, $cfg2) {
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my %cfg = %$_;
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foreach my $config (keys %cfg) {
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if ($mod_plus and $config{$config}) {
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next if $config{$config} eq "y";
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next if $cfg{$config} eq '#undef';
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}
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$config{$config} = $cfg{$config};
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}
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}
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return \%config;
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}
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sub config_diff($$$) {
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my $cfg1 = shift;
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my $cfg2 = shift;
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my $new_only = shift;
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my %config;
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foreach my $config (keys %$cfg2) {
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if (!defined($cfg1->{$config}) or $cfg1->{$config} ne $cfg2->{$config}) {
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next if $new_only and !defined($cfg1->{$config}) and $cfg2->{$config} eq '#undef';
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$config{$config} = $cfg2->{$config};
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}
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}
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return \%config
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}
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sub config_sub($$) {
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my $cfg1 = shift;
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my $cfg2 = shift;
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my %config = %{$cfg1};
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my @keys = map {
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my $expr = $_;
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$expr =~ /[?.*]/ ?
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map {
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/^$expr$/ ? $_ : ()
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} keys %config : $expr;
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} keys %$cfg2;
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foreach my $config (@keys) {
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delete $config{$config};
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}
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return \%config;
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}
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sub print_cfgline($$) {
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my $name = shift;
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my $val = shift;
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if ($val eq '#undef' or $val eq 'n') {
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print "# $PREFIX$name is not set\n";
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} else {
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print "$PREFIX$name=$val\n";
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}
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}
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sub dump_config($) {
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my $cfg = shift;
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die "argument error in dump_config" unless ($cfg);
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my %config = %$cfg;
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foreach my $config (sort keys %config) {
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print_cfgline($config, $config{$config});
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}
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}
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sub parse_expr {
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my $pos = shift;
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my $mod_plus = shift;
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my $arg = $arg[$$pos++];
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die "Parse error" if (!$arg);
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if ($arg eq '&') {
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my $arg1 = parse_expr($pos);
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my $arg2 = parse_expr($pos);
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return config_and($arg1, $arg2);
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} elsif ($arg =~ /^\+/) {
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my $arg1 = parse_expr($pos);
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my $arg2 = parse_expr($pos);
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return config_add($arg1, $arg2, 0);
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} elsif ($arg =~ /^m\+/) {
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my $arg1 = parse_expr($pos);
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my $arg2 = parse_expr($pos, 1);
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return config_add($arg1, $arg2, 1);
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} elsif ($arg eq '>') {
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my $arg1 = parse_expr($pos);
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my $arg2 = parse_expr($pos);
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return config_diff($arg1, $arg2, 0);
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} elsif ($arg eq '>+') {
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my $arg1 = parse_expr($pos);
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my $arg2 = parse_expr($pos);
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return config_diff($arg1, $arg2, 1);
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} elsif ($arg eq '-') {
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my $arg1 = parse_expr($pos);
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my $arg2 = parse_expr($pos);
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return config_sub($arg1, $arg2);
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} else {
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return load_config($arg, $mod_plus);
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}
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}
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while (@ARGV > 0 and $ARGV[0] =~ /^-\w+$/) {
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my $cmd = shift @ARGV;
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if ($cmd =~ /^-n$/) {
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$PREFIX = "";
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} elsif ($cmd =~ /^-p$/) {
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$PREFIX = shift @ARGV;
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} else {
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die "Invalid option: $cmd\n";
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}
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}
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@arg = @ARGV;
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my $pos = 0;
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dump_config(parse_expr(\$pos));
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die "Parse error" if ($arg[$pos]);
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