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