checkpatch: warn on bare SHA-1 commit IDs in commit logs

Commit IDs should have commit descriptions too.  Warn when a 12 to 40 byte
SHA-1 is used in commit logs.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a51ca0e..984a82e 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2317,9 +2317,11 @@ sub process {
                }
 
 # Check for git id commit length and improperly formed commit descriptions
-               if ($in_commit_log && $line =~ /\b(c)ommit\s+([0-9a-f]{5,})/i) {
-                       my $init_char = $1;
-                       my $orig_commit = lc($2);
+               if ($in_commit_log &&
+                   ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
+                    $line =~ /\b[0-9a-f]{12,40}\b/i)) {
+                       my $init_char = "c";
+                       my $orig_commit = "";
                        my $short = 1;
                        my $long = 0;
                        my $case = 1;
@@ -2330,6 +2332,13 @@ sub process {
                        my $orig_desc = "commit description";
                        my $description = "";
 
+                       if ($line =~ /\b(c)ommit\s+([0-9a-f]{5,})\b/i) {
+                               $init_char = $1;
+                               $orig_commit = lc($2);
+                       } elsif ($line =~ /\b([0-9a-f]{12,40})\b/i) {
+                               $orig_commit = lc($1);
+                       }
+
                        $short = 0 if ($line =~ /\bcommit\s+[0-9a-f]{12,40}/i);
                        $long = 1 if ($line =~ /\bcommit\s+[0-9a-f]{41,}/i);
                        $space = 0 if ($line =~ /\bcommit [0-9a-f]/i);