get_maintainer: add --self-test for internal consistency tests

Add "--self-test" option to get_maintainer.pl to show potential
issues in MAINTAINERS file(s) content.

Pattern check warnings are shown for "F" and "X" patterns found in
MAINTAINERS file(s) which do not match any files known by git.

Link: http://lkml.kernel.org/r/64994f911b3510d0f4c8ac2e113501dfcec1f3c9.1509559540.git.tom.saeger@oracle.com
Signed-off-by: Tom Saeger <tom.saeger@oracle.com>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/get_maintainer.pl

@@ -57,6 +57,7 @@ my $sections = 0;
 my $file_emails = 0;
 my $from_filename = 0;
 my $pattern_depth = 0;
+my $self_test = 0;
 my $version = 0;
 my $help = 0;
 my $find_maintainer_files = 0;
@@ -138,6 +139,7 @@ my %VCS_cmds_git = (
     "subject_pattern" => "^GitSubject: (.*)",
     "stat_pattern" => "^(\\d+)\\t(\\d+)\\t\$file\$",
     "file_exists_cmd" => "git ls-files \$file",
+    "list_files_cmd" => "git ls-files \$file",
 );
 
 my %VCS_cmds_hg = (
@@ -167,6 +169,7 @@ my %VCS_cmds_hg = (
     "subject_pattern" => "^HgSubject: (.*)",
     "stat_pattern" => "^(\\d+)\t(\\d+)\t\$file\$",
     "file_exists_cmd" => "hg files \$file",
+    "list_files_cmd" => "hg manifest -R \$file",
 );
 
 my $conf = which_conf(".get_maintainer.conf");
@@ -216,6 +219,14 @@ if (-f $ignore_file) {
     close($ignore);
 }
 
+if ($#ARGV > 0) {
+    foreach (@ARGV) {
+        if ($_ eq "-self-test" || $_ eq "--self-test") {
+            die "$P: using --self-test does not allow any other option or argument\n";
+        }
+    }
+}
+
 if (!GetOptions(
 		'email!' => \$email,
 		'git!' => \$email_git,
@@ -252,6 +263,7 @@ if (!GetOptions(
 		'fe|file-emails!' => \$file_emails,
 		'f|file' => \$from_filename,
 		'find-maintainer-files' => \$find_maintainer_files,
+		'self-test' => \$self_test,
 		'v|version' => \$version,
 		'h|help|usage' => \$help,
 		)) {
@@ -268,6 +280,12 @@ if ($version != 0) {
     exit 0;
 }
 
+if ($self_test) {
+    read_all_maintainer_files();
+    check_maintainers_patterns();
+    exit 0;
+}
+
 if (-t STDIN && !@ARGV) {
     # We're talking to a terminal, but have no command line arguments.
     die "$P: missing patchfile or -f file - use --help if necessary\n";
@@ -311,12 +329,14 @@ if (!top_of_kernel_tree($lk_path)) {
 my @typevalue = ();
 my %keyword_hash;
 my @mfiles = ();
+my @self_test_pattern_info = ();
 
 sub read_maintainer_file {
     my ($file) = @_;
 
     open (my $maint, '<', "$file")
 	or die "$P: Can't open MAINTAINERS file '$file': $!\n";
+    my $i = 1;
     while (<$maint>) {
 	my $line = $_;
 
@@ -333,6 +353,9 @@ sub read_maintainer_file {
 		if ((-d $value)) {
 		    $value =~ s@([^/])$@$1/@;
 		}
+		if ($self_test) {
+			push(@self_test_pattern_info, {file=>$file, line=>$line, linenr=>$i, pat=>$value});
+		}
 	    } elsif ($type eq "K") {
 		$keyword_hash{@typevalue} = $value;
 	    }
@@ -341,6 +364,7 @@ sub read_maintainer_file {
 	    $line =~ s/\n$//g;
 	    push(@typevalue, $line);
 	}
+	$i++;
     }
     close($maint);
 }
@@ -357,6 +381,9 @@ sub find_ignore_git {
     return grep { $_ !~ /^\.git$/; } @_;
 }
 
+read_all_maintainer_files();
+
+sub read_all_maintainer_files {
     if (-d "${lk_path}MAINTAINERS") {
         opendir(DIR, "${lk_path}MAINTAINERS") or die $!;
         my @files = readdir(DIR);
@@ -378,6 +405,7 @@ if ($find_maintainer_files) {
     foreach my $file (@mfiles) {
         read_maintainer_file("$file");
     }
+}
 
 #
 # Read mail address map
@@ -586,6 +614,20 @@ if ($web) {
 
 exit($exit);
 
+sub check_maintainers_patterns {
+    my @lsfiles = ();
+
+    @lsfiles = vcs_list_files($lk_path);
+
+    for my $x (@self_test_pattern_info) {
+        if (!grep(m@^$x->{pat}@, @lsfiles)) {
+            my $line = $x->{line};
+            chomp($line);
+            print("$x->{file}:$x->{linenr}: warning: no matches $line\n");
+        }
+    }
+}
+
 sub ignore_email_address {
     my ($address) = @_;
 
@@ -863,6 +905,7 @@ Other options:
   --sections => print all of the subsystem sections with pattern matches
   --letters => print all matching 'letter' types from all matching sections
   --mailmap => use .mailmap file (default: $email_use_mailmap)
+  --self-test => show potential issues with MAINTAINERS file content
   --version => show version
   --help => show this help information
 
@@ -2192,6 +2235,23 @@ sub vcs_file_exists {
     return $exists;
 }
 
+sub vcs_list_files {
+    my ($file) = @_;
+
+    my @lsfiles = ();
+
+    my $vcs_used = vcs_exists();
+    return 0 if (!$vcs_used);
+
+    my $cmd = $VCS_cmds{"list_files_cmd"};
+    $cmd =~ s/(\$\w+)/$1/eeg;   # interpolate $cmd
+    @lsfiles = &{$VCS_cmds{"execute_cmd"}}($cmd);
+
+    return () if ($? != 0);
+
+    return @lsfiles;
+}
+
 sub uniq {
     my (@parms) = @_;