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 #!/usr/bin/perl -w
 # SPDX-License-Identifier: GPL-2.0-only
 #
 # Copyright 2015 - Steven Rostedt, Red Hat Inc.
 # Copyright 2017 - Steven Rostedt, VMware, Inc.
 #
 
 # usage:
 #  config-bisect.pl [options] good-config bad-config [good|bad]
 #
 
 # Compares a good config to a bad config, then takes half of the diffs
 # and produces a config that is somewhere between the good config and
 # the bad config. That is, the resulting config will start with the
 # good config and will try to make half of the differences of between
 # the good and bad configs match the bad config. It tries because of
 # dependencies between the two configs it may not be able to change
 # exactly half of the configs that are different between the two config
 # files.
 
 # Here's a normal way to use it:
 #
 #  $ cd /path/to/linux/kernel
 #  $ config-bisect.pl /path/to/good/config /path/to/bad/config
 
 # This will now pull in good config (blowing away .config in that directory
 # so do not make that be one of the good or bad configs), and then
 # build the config with "make oldconfig" to make sure it matches the
 # current kernel. It will then store the configs in that result for
 # the good config. It does the same for the bad config as well.
 # The algorithm will run, merging half of the differences between
 # the two configs and building them with "make oldconfig" to make sure
 # the result changes (dependencies may reset changes the tool had made).
 # It then copies the result of its good config to /path/to/good/config.tmp
 # and the bad config to /path/to/bad/config.tmp (just appends ".tmp" to the
 # files passed in). And the ".config" that you should test will be in
 # directory
 
 # After the first run, determine if the result is good or bad then
 # run the same command appending the result
 
 # For good results:
 #  $ config-bisect.pl /path/to/good/config /path/to/bad/config good
 
 # For bad results:
 #  $ config-bisect.pl /path/to/good/config /path/to/bad/config bad
 
 # Do not change the good-config or bad-config, config-bisect.pl will
 # copy the good-config to a temp file with the same name as good-config
 # but with a ".tmp" after it. It will do the same with the bad-config.
 
 # If "good" or "bad" is not stated at the end, it will copy the good and
 # bad configs to the .tmp versions. If a .tmp version already exists, it will
 # warn before writing over them (-r will not warn, and just write over them).
 # If the last config is labeled "good", then it will copy it to the good .tmp
 # version. If the last config is labeled "bad", it will copy it to the bad
 # .tmp version. It will continue this until it can not merge the two any more
 # without the result being equal to either the good or bad .tmp configs.
 
 my $start = 0;
 my $val = "";
 
 my $pwd = `pwd`;
 chomp $pwd;
 my $tree = $pwd;
 my $build;
 
 my $output_config;
 my $reset_bisect;
 
 sub usage {
     print << "EOF"
 
 usage: config-bisect.pl [-l linux-tree][-b build-dir] good-config bad-config [good|bad]
   -l [optional] define location of linux-tree (default is current directory)
   -b [optional] define location to build (O=build-dir) (default is linux-tree)
   good-config the config that is considered good
   bad-config the config that does not work
   "good" add this if the last run produced a good config
   "bad" add this if the last run produced a bad config
   If "good" or "bad" is not specified, then it is the start of a new bisect
 
   Note, each run will create copy of good and bad configs with ".tmp" appended.
 
 EOF
 ;
 
     exit(-1);
 }
 
 sub doprint {
     print @_;
 }
 
 sub dodie {
     doprint "CRITICAL FAILURE... ", @_, "\n";
 
     die @_, "\n";
 }
 
 sub expand_path {
     my ($file) = @_;
 
     if ($file =~ m,^/,) {
     return $file;
     }
     return "$pwd/$file";
 }
 
 sub read_prompt {
     my ($cancel, $prompt) = @_;
 
     my $ans;
 
     for (;;) {
     if ($cancel) {
         print "$prompt [y/n/C] ";
     } else {
         print "$prompt [y/N] ";
     }
     $ans = <STDIN>;
     chomp $ans;
     if ($ans =~ /^\s*$/) {
         if ($cancel) {
         $ans = "c";
         } else {
         $ans = "n";
         }
     }
     last if ($ans =~ /^y$/i || $ans =~ /^n$/i);
     if ($cancel) {
         last if ($ans =~ /^c$/i);
         print "Please answer either 'y', 'n' or 'c'.\n";
     } else {
         print "Please answer either 'y' or 'n'.\n";
     }
     }
     if ($ans =~ /^c/i) {
     exit;
     }
     if ($ans !~ /^y$/i) {
     return 0;
     }
     return 1;
 }
 
 sub read_yn {
     my ($prompt) = @_;
 
     return read_prompt 0, $prompt;
 }
 
 sub read_ync {
     my ($prompt) = @_;
 
     return read_prompt 1, $prompt;
 }
 
 sub run_command {
     my ($command, $redirect) = @_;
     my $start_time;
     my $end_time;
     my $dord = 0;
     my $pid;
 
     $start_time = time;
 
     doprint("$command ... ");
 
     $pid = open(CMD, "$command 2>&1 |") or
     dodie "unable to exec $command";
 
     if (defined($redirect)) {
     open (RD, ">$redirect") or
         dodie "failed to write to redirect $redirect";
     $dord = 1;
     }
 
     while (<CMD>) {
     print RD  if ($dord);
     }
 
     waitpid($pid, 0);
     my $failed = $?;
 
     close(CMD);
     close(RD)  if ($dord);
 
     $end_time = time;
     my $delta = $end_time - $start_time;
 
     if ($delta == 1) {
     doprint "[1 second] ";
     } else {
     doprint "[$delta seconds] ";
     }
 
     if ($failed) {
     doprint "FAILED!\n";
     } else {
     doprint "SUCCESS\n";
     }
 
     return !$failed;
 }
 
 ###### CONFIG BISECT ######
 
 # config_ignore holds the configs that were set (or unset) for
 # a good config and we will ignore these configs for the rest
 # of a config bisect. These configs stay as they were.
 my %config_ignore;
 
 # config_set holds what all configs were set as.
 my %config_set;
 
 # config_off holds the set of configs that the bad config had disabled.
 # We need to record them and set them in the .config when running
 # olddefconfig, because olddefconfig keeps the defaults.
 my %config_off;
 
 # config_off_tmp holds a set of configs to turn off for now
 my @config_off_tmp;
 
 # config_list is the set of configs that are being tested
 my %config_list;
 my %null_config;
 
 my %dependency;
 
 my $make;
 
 sub make_oldconfig {
 
     if (!run_command "$make olddefconfig") {
     # Perhaps olddefconfig doesn't exist in this version of the kernel
     # try oldnoconfig
     doprint "olddefconfig failed, trying make oldnoconfig\n";
     if (!run_command "$make oldnoconfig") {
         doprint "oldnoconfig failed, trying yes '' | make oldconfig\n";
         # try a yes '' | oldconfig
         run_command "yes '' | $make oldconfig" or
         dodie "failed make config oldconfig";
     }
     }
 }
 
 sub assign_configs {
     my ($hash, $config) = @_;
 
     doprint "Reading configs from $config\n";
 
     open (IN, $config)
     or dodie "Failed to read $config";
 
     while (<IN>) {
     chomp;
     if (/^((CONFIG\S*)=.*)/) {
         ${$hash}{$2} = $1;
     } elsif (/^(# (CONFIG\S*) is not set)/) {
         ${$hash}{$2} = $1;
     }
     }
 
     close(IN);
 }
 
 sub process_config_ignore {
     my ($config) = @_;
 
     assign_configs \%config_ignore, $config;
 }
 
 sub get_dependencies {
     my ($config) = @_;
 
     my $arr = $dependency{$config};
     if (!defined($arr)) {
     return ();
     }
 
     my @deps = @{$arr};
 
     foreach my $dep (@{$arr}) {
     print "ADD DEP $dep\n";
     @deps = (@deps, get_dependencies $dep);
     }
 
     return @deps;
 }
 
 sub save_config {
     my ($pc, $file) = @_;
 
     my %configs = %{$pc};
 
     doprint "Saving configs into $file\n";
 
     open(OUT, ">$file") or dodie "Can not write to $file";
 
     foreach my $config (keys %configs) {
     print OUT "$configs{$config}\n";
     }
     close(OUT);
 }
 
 sub create_config {
     my ($name, $pc) = @_;
 
     doprint "Creating old config from $name configs\n";
 
     save_config $pc, $output_config;
 
     make_oldconfig;
 }
 
 # compare two config hashes, and return configs with different vals.
 # It returns B's config values, but you can use A to see what A was.
 sub diff_config_vals {
     my ($pa, $pb) = @_;
 
     # crappy Perl way to pass in hashes.
     my %a = %{$pa};
     my %b = %{$pb};
 
     my %ret;
 
     foreach my $item (keys %a) {
     if (defined($b{$item}) && $b{$item} ne $a{$item}) {
         $ret{$item} = $b{$item};
     }
     }
 
     return %ret;
 }
 
 # compare two config hashes and return the configs in B but not A
 sub diff_configs {
     my ($pa, $pb) = @_;
 
     my %ret;
 
     # crappy Perl way to pass in hashes.
     my %a = %{$pa};
     my %b = %{$pb};
 
     foreach my $item (keys %b) {
     if (!defined($a{$item})) {
         $ret{$item} = $b{$item};
     }
     }
 
     return %ret;
 }
 
 # return if two configs are equal or not
 # 0 is equal +1 b has something a does not
 # +1 if a and b have a different item.
 # -1 if a has something b does not
 sub compare_configs {
     my ($pa, $pb) = @_;
 
     my %ret;
 
     # crappy Perl way to pass in hashes.
     my %a = %{$pa};
     my %b = %{$pb};
 
     foreach my $item (keys %b) {
     if (!defined($a{$item})) {
         return 1;
     }
     if ($a{$item} ne $b{$item}) {
         return 1;
     }
     }
 
     foreach my $item (keys %a) {
     if (!defined($b{$item})) {
         return -1;
     }
     }
 
     return 0;
 }
 
 sub process_failed {
     my ($config) = @_;
 
     doprint "\n\n***************************************\n";
     doprint "Found bad config: $config\n";
     doprint "***************************************\n\n";
 }
 
 sub process_new_config {
     my ($tc, $nc, $gc, $bc) = @_;
 
     my %tmp_config = %{$tc};
     my %good_configs = %{$gc};
     my %bad_configs = %{$bc};
 
     my %new_configs;
 
     my $runtest = 1;
     my $ret;
 
     create_config "tmp_configs", \%tmp_config;
     assign_configs \%new_configs, $output_config;
 
     $ret = compare_configs \%new_configs, \%bad_configs;
     if (!$ret) {
     doprint "New config equals bad config, try next test\n";
     $runtest = 0;
     }
 
     if ($runtest) {
     $ret = compare_configs \%new_configs, \%good_configs;
     if (!$ret) {
         doprint "New config equals good config, try next test\n";
         $runtest = 0;
     }
     }
 
     %{$nc} = %new_configs;
 
     return $runtest;
 }
 
 sub convert_config {
     my ($config) = @_;
 
     if ($config =~ /^# (.*) is not set/) {
     $config = "$1=n";
     }
 
     $config =~ s/^CONFIG_//;
     return $config;
 }
 
 sub print_config {
     my ($sym, $config) = @_;
 
     $config = convert_config $config;
     doprint "$sym$config\n";
 }
 
 sub print_config_compare {
     my ($good_config, $bad_config) = @_;
 
     $good_config = convert_config $good_config;
     $bad_config = convert_config $bad_config;
 
     my $good_value = $good_config;
     my $bad_value = $bad_config;
     $good_value =~ s/(.*)=//;
     my $config = $1;
 
     $bad_value =~ s/.*=//;
 
     doprint " $config $good_value -> $bad_value\n";
 }
 
 # Pass in:
 # $phalf: half of the configs names you want to add
 # $oconfigs: The orginial configs to start with
 # $sconfigs: The source to update $oconfigs with (from $phalf)
 # $which: The name of which half that is updating (top / bottom)
 # $type: The name of the source type (good / bad)
 sub make_half {
     my ($phalf, $oconfigs, $sconfigs, $which, $type) = @_;
 
     my @half = @{$phalf};
     my %orig_configs = %{$oconfigs};
     my %source_configs = %{$sconfigs};
 
     my %tmp_config = %orig_configs;
 
     doprint "Settings bisect with $which half of $type configs:\n";
     foreach my $item (@half) {
     doprint "Updating $item to $source_configs{$item}\n";
     $tmp_config{$item} = $source_configs{$item};
     }
 
     return %tmp_config;
 }
 
 sub run_config_bisect {
     my ($pgood, $pbad) = @_;
 
     my %good_configs = %{$pgood};
     my %bad_configs = %{$pbad};
 
     my %diff_configs = diff_config_vals \%good_configs, \%bad_configs;
     my %b_configs = diff_configs \%good_configs, \%bad_configs;
     my %g_configs = diff_configs \%bad_configs, \%good_configs;
 
     # diff_arr is what is in both good and bad but are different (y->n)
     my @diff_arr = keys %diff_configs;
     my $len_diff = $#diff_arr + 1;
 
     # b_arr is what is in bad but not in good (has depends)
     my @b_arr = keys %b_configs;
     my $len_b = $#b_arr + 1;
 
     # g_arr is what is in good but not in bad
     my @g_arr = keys %g_configs;
     my $len_g = $#g_arr + 1;
 
     my $runtest = 0;
     my %new_configs;
     my $ret;
 
     # Look at the configs that are different between good and bad.
     # This does not include those that depend on other configs
     #  (configs depending on other configs that are not set would
     #   not show up even as a "# CONFIG_FOO is not set"
 
 
     doprint "# of configs to check:             $len_diff\n";
     doprint "# of configs showing only in good: $len_g\n";
     doprint "# of configs showing only in bad:  $len_b\n";
 
     if ($len_diff > 0) {
     # Now test for different values
 
     doprint "Configs left to check:\n";
     doprint "  Good Config\t\t\tBad Config\n";
     doprint "  -----------\t\t\t----------\n";
     foreach my $item (@diff_arr) {
         doprint "  $good_configs{$item}\t$bad_configs{$item}\n";
     }
 
     my $half = int($#diff_arr / 2);
     my @tophalf = @diff_arr[0 .. $half];
 
     doprint "Set tmp config to be good config with some bad config values\n";
 
     my %tmp_config = make_half \@tophalf, \%good_configs,
         \%bad_configs, "top", "bad";
 
     $runtest = process_new_config \%tmp_config, \%new_configs,
                 \%good_configs, \%bad_configs;
 
     if (!$runtest) {
         doprint "Set tmp config to be bad config with some good config values\n";
 
         my %tmp_config = make_half \@tophalf, \%bad_configs,
         \%good_configs, "top", "good";
 
         $runtest = process_new_config \%tmp_config, \%new_configs,
         \%good_configs, \%bad_configs;
     }
     }
 
     if (!$runtest && $len_diff > 0) {
     # do the same thing, but this time with bottom half
 
     my $half = int($#diff_arr / 2);
     my @bottomhalf = @diff_arr[$half+1 .. $#diff_arr];
 
     doprint "Set tmp config to be good config with some bad config values\n";
 
     my %tmp_config = make_half \@bottomhalf, \%good_configs,
         \%bad_configs, "bottom", "bad";
 
     $runtest = process_new_config \%tmp_config, \%new_configs,
                 \%good_configs, \%bad_configs;
 
     if (!$runtest) {
         doprint "Set tmp config to be bad config with some good config values\n";
 
         my %tmp_config = make_half \@bottomhalf, \%bad_configs,
         \%good_configs, "bottom", "good";
 
         $runtest = process_new_config \%tmp_config, \%new_configs,
         \%good_configs, \%bad_configs;
     }
     }
 
     if ($runtest) {
     make_oldconfig;
     doprint "READY TO TEST .config IN $build\n";
     return 0;
     }
 
     doprint "\n%%%%%%%% FAILED TO FIND SINGLE BAD CONFIG %%%%%%%%\n";
     doprint "Hmm, can't make any more changes without making good == bad?\n";
     doprint "Difference between good (+) and bad (-)\n";
 
     foreach my $item (keys %bad_configs) {
     if (!defined($good_configs{$item})) {
         print_config "-", $bad_configs{$item};
     }
     }
 
     foreach my $item (keys %good_configs) {
     next if (!defined($bad_configs{$item}));
     if ($good_configs{$item} ne $bad_configs{$item}) {
         print_config_compare $good_configs{$item}, $bad_configs{$item};
     }
     }
 
     foreach my $item (keys %good_configs) {
     if (!defined($bad_configs{$item})) {
         print_config "+", $good_configs{$item};
     }
     }
     return -1;
 }
 
 sub config_bisect {
     my ($good_config, $bad_config) = @_;
     my $ret;
 
     my %good_configs;
     my %bad_configs;
     my %tmp_configs;
 
     doprint "Run good configs through make oldconfig\n";
     assign_configs \%tmp_configs, $good_config;
     create_config "$good_config", \%tmp_configs;
     assign_configs \%good_configs, $output_config;
 
     doprint "Run bad configs through make oldconfig\n";
     assign_configs \%tmp_configs, $bad_config;
     create_config "$bad_config", \%tmp_configs;
     assign_configs \%bad_configs, $output_config;
 
     save_config \%good_configs, $good_config;
     save_config \%bad_configs, $bad_config;
 
     return run_config_bisect \%good_configs, \%bad_configs;
 }
 
 while ($#ARGV >= 0) {
     if ($ARGV[0] !~ m/^-/) {
     last;
     }
     my $opt = shift @ARGV;
 
     if ($opt eq "-b") {
     $val = shift @ARGV;
     if (!defined($val)) {
         die "-b requires value\n";
     }
     $build = $val;
     }
 
     elsif ($opt eq "-l") {
     $val = shift @ARGV;
     if (!defined($val)) {
         die "-l requires value\n";
     }
     $tree = $val;
     }
 
     elsif ($opt eq "-r") {
     $reset_bisect = 1;
     }
 
     elsif ($opt eq "-h") {
     usage;
     }
 
     else {
     die "Unknown option $opt\n";
     }
 }
 
 $build = $tree if (!defined($build));
 
 $tree = expand_path $tree;
 $build = expand_path $build;
 
 if ( ! -d $tree ) {
     die "$tree not a directory\n";
 }
 
 if ( ! -d $build ) {
     die "$build not a directory\n";
 }
 
 usage if $#ARGV < 1;
 
 if ($#ARGV == 1) {
     $start = 1;
 } elsif ($#ARGV == 2) {
     $val = $ARGV[2];
     if ($val ne "good" && $val ne "bad") {
     die "Unknown command '$val', bust be either \"good\" or \"bad\"\n";
     }
 } else {
     usage;
 }
 
 my $good_start = expand_path $ARGV[0];
 my $bad_start = expand_path $ARGV[1];
 
 my $good = "$good_start.tmp";
 my $bad = "$bad_start.tmp";
 
 $make = "make";
 
 if ($build ne $tree) {
     $make = "make O=$build"
 }
 
 $output_config = "$build/.config";
 
 if ($start) {
     if ( ! -f $good_start ) {
     die "$good_start not found\n";
     }
     if ( ! -f $bad_start ) {
     die "$bad_start not found\n";
     }
     if ( -f $good || -f $bad ) {
     my $p = "";
 
     if ( -f $good ) {
         $p = "$good exists\n";
     }
 
     if ( -f $bad ) {
         $p = "$p$bad exists\n";
     }
 
     if (!defined($reset_bisect)) {
         if (!read_yn "${p}Overwrite and start new bisect anyway?") {
         exit (-1);
         }
     }
     }
     run_command "cp $good_start $good" or die "failed to copy to $good\n";
     run_command "cp $bad_start $bad" or die "failed to copy to $bad\n";
 } else {
     if ( ! -f $good ) {
     die "Can not find file $good\n";
     }
     if ( ! -f $bad ) {
     die "Can not find file $bad\n";
     }
     if ($val eq "good") {
     run_command "cp $output_config $good" or die "failed to copy $config to $good\n";
     } elsif ($val eq "bad") {
     run_command "cp $output_config $bad" or die "failed to copy $config to $bad\n";
     }
 }
 
 chdir $tree || die "can't change directory to $tree";
 
 my $ret = config_bisect $good, $bad;
 
 if (!$ret) {
     exit(0);
 }
 
 if ($ret > 0) {
     doprint "Cleaning temp files\n";
     run_command "rm $good";
     run_command "rm $bad";
     exit(1);
 } else {
     doprint "See good and bad configs for details:\n";
     doprint "good: $good\n";
     doprint "bad:  $bad\n";
     doprint "%%%%%%%% FAILED TO FIND SINGLE BAD CONFIG %%%%%%%%\n";
 }
 exit(2);

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