checkpatch: remove email address comment from email address comparisons

About 2% of the last 100K commits have email addresses that include an
RFC2822 compliant comment like:

	Peter Zijlstra (Intel) <peterz@infradead.org>

checkpatch currently does a comparison of the complete name and address to
the submitted author to determine if the author has signed-off and emits a
warning if the exact email names and addresses do not match.

Unfortunately, the author email address can be written without the comment
like:

	Peter Zijlstra <peterz@infradead.org>

Add logic to compare the comment stripped email addresses to avoid this
warning.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/ebaa2f7c8f94e25520981945cddcc1982e70e072.camel@perches.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a63380c..3f62971 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1118,6 +1118,7 @@ sub parse_email {
        my ($formatted_email) = @_;
 
        my $name = "";
+       my $name_comment = "";
        my $address = "";
        my $comment = "";
 
@@ -1150,6 +1151,10 @@ sub parse_email {
 
        $name = trim($name);
        $name =~ s/^\"|\"$//g;
+       $name =~ s/(\s*\([^\)]+\))\s*//;
+       if (defined($1)) {
+               $name_comment = trim($1);
+       }
        $address = trim($address);
        $address =~ s/^\<|\>$//g;
 
@@ -1158,7 +1163,7 @@ sub parse_email {
                $name = "\"$name\"";
        }
 
-       return ($name, $address, $comment);
+       return ($name, $name_comment, $address, $comment);
 }
 
 sub format_email {
@@ -1184,6 +1189,23 @@ sub format_email {
        return $formatted_email;
 }
 
+sub reformat_email {
+       my ($email) = @_;
+
+       my ($email_name, $name_comment, $email_address, $comment) = parse_email($email);
+       return format_email($email_name, $email_address);
+}
+
+sub same_email_addresses {
+       my ($email1, $email2) = @_;
+
+       my ($email1_name, $name1_comment, $email1_address, $comment1) = parse_email($email1);
+       my ($email2_name, $name2_comment, $email2_address, $comment2) = parse_email($email2);
+
+       return $email1_name eq $email2_name &&
+              $email1_address eq $email2_address;
+}
+
 sub which {
        my ($bin) = @_;
 
@@ -2604,17 +2626,16 @@ sub process {
                        $author = $1;
                        $author = encode("utf8", $author) if ($line =~ /=\?utf-8\?/i);
                        $author =~ s/"//g;
+                       $author = reformat_email($author);
                }
 
 # Check the patch for a signoff:
-               if ($line =~ /^\s*signed-off-by:/i) {
+               if ($line =~ /^\s*signed-off-by:\s*(.*)/i) {
                        $signoff++;
                        $in_commit_log = 0;
                        if ($author ne '') {
-                               my $l = $line;
-                               $l =~ s/"//g;
-                               if ($l =~ /^\s*signed-off-by:\s*\Q$author\E/i) {
-                                   $authorsignoff = 1;
+                               if (same_email_addresses($1, $author)) {
+                                       $authorsignoff = 1;
                                }
                        }
                }
@@ -2664,7 +2685,7 @@ sub process {
                                }
                        }
 
-                       my ($email_name, $email_address, $comment) = parse_email($email);
+                       my ($email_name, $name_comment, $email_address, $comment) = parse_email($email);
                        my $suggested_email = format_email(($email_name, $email_address));
                        if ($suggested_email eq "") {
                                ERROR("BAD_SIGN_OFF",
@@ -2675,9 +2696,7 @@ sub process {
                                $dequoted =~ s/" </ </;
                                # Don't force email to have quotes
                                # Allow just an angle bracketed address
-                               if ("$dequoted$comment" ne $email &&
-                                   "<$email_address>$comment" ne $email &&
-                                   "$suggested_email$comment" ne $email) {
+                               if (!same_email_addresses($email, $suggested_email)) {
                                        WARN("BAD_SIGN_OFF",
                                             "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
                                }