Re: [PATCH 1/1] checkpatch: check for subject uniqueness in git repository.

[Joe Perches]

On Mon, 2014-09-15 at 20:43 +0200, Fabian Frederick wrote:
> Adding patch subject uniqueness check in checkpatch --strict mode.
> See Documentation/SubmittingPatches/globally-unique identifier.

Perhaps something like this?
---
 scripts/checkpatch.pl | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 0c520f7..e19c40b 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -622,6 +622,27 @@ sub git_commit_info {
        return ($id, $desc);
 }
 
+my @git_commits = ();
+my @previous_subjects = ();
+
+sub check_subject_duplication {
+       my ($subject) = @_;
+
+       if ($check && $#git_commits < 1 && which("git") && -e ".git") {
+               my $output = `git log --no-color --format='%H %s' 2>&1`;
+               $output =~ s/^\s*//gm;
+               @git_commits = split("\n", $output);
+       }
+
+       return 1 if (grep(/^[a-f0-9]{40,40} $subject$/, @git_commits));
+
+       return 2 if (grep(/^$subject$/, @previous_subjects));
+
+       push(@previous_subjects, $subject);
+
+       return 0;
+}
+
 $chk_signoff = 0 if ($file);
 
 my @rawlines = ();
@@ -1264,6 +1285,20 @@ sub raw_line {
        return $line;
 }
 
+sub get_complete_header {
+       my ($linenr) = @_;
+
+       my $offset = $linenr - 1;
+
+       my $line = $rawlines[$offset++];
+       while (defined $rawlines[$offset] &&
+              $rawlines[$offset] =~ /\s(\S.*)$/) {
+               $line .= $rawlines[$offset++];
+       }
+
+       return $line;
+}
+
 sub cat_vet {
        my ($vet) = @_;
        my ($res, $coded);
@@ -2047,6 +2082,23 @@ sub process {
                        }
                }
 
+# Check git commit and patch subject duplication
+               if ($in_header_lines && $line =~ /^Subject:/) {
+                       my $subject = get_complete_header($linenr);
+                       if ($subject =~ /^Subject:\s*(?:\[[^\]]*\])?\s*(.*)$/) {
+                               $subject = $1;
+                       }
+
+                       my $subject_dup = check_subject_duplication($subject);
+                       if ($subject_dup == 1) {
+                               CHK("NOT_UNIQUE_SUBJECT",
+                                   "Identical git commit subject found\n" . 
$herecurr);
+                       } elsif ($subject_dup == 2) {
+                               CHK("NOT_UNIQUE_SUBJECT",
+                                   "Identical patch commit subject found\n" . 
$herecurr);
+                       }
+               }
+
 # Check the patch for a signoff:
                if ($line =~ /^\s*signed-off-by:/i) {
                        $signoff++;


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