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Date: Wed, 07 Oct 2020 13:30:14 -0700
From: Joe Perches <joe@...ches.com>
To: Dwaipayan Ray <dwaipayanray1@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel-mentees@...ts.linuxfoundation.org,
linux-kernel@...r.kernel.org, lukas.bulwahn@...il.com
Subject: Re: [PATCH v6] checkpatch: add new warnings to author signoff
checks.
On Thu, 2020-10-08 at 00:50 +0530, Dwaipayan Ray wrote:
> The author signed-off-by checks are currently very vague.
> Cases like same name or same address are not handled separately.
Thanks Dwaipayan.
This might have to eventually change case #5 to CHK, but
otherwise this seems sensible and let's see how it goes...
Acked-by: Joe Perches <joe@...ches.com>
> For example, running checkpatch on commit be6577af0cef
> ("parisc: Add atomic64_set_release() define to avoid CPU soft lockups"),
> gives:
>
> WARNING: Missing Signed-off-by: line by nominal patch author
> 'John David Anglin <dave.anglin@...l.net>'
>
> The signoff line was:
> "Signed-off-by: Dave Anglin <dave.anglin@...l.net>"
>
> Clearly the author has signed off but with a slightly different version
> of his name. A more appropriate warning would have been to point out
> at the name mismatch instead.
>
> Previously, the values assumed by $authorsignoff were either 0 or 1
> to indicate whether a proper sign off by author is present.
> Extended the checks to handle four new cases.
>
> $authorsignoff values now denote the following:
>
> 0: Missing sign off by patch author.
>
> 1: Sign off present and identical.
>
> 2: Addresses and names match, but comments differ.
> "James Watson(JW) <james@...il.com>", "James Watson <james@...il.com>"
>
> 3: Addresses match, but names are different.
> "James Watson <james@...il.com>", "James <james@...il.com>"
>
> 4: Names match, but addresses are different.
> "James Watson <james@...son.com>", "James Watson <james@...il.com>"
>
> 5: Names match, addresses excluding subaddress details (RFC 5233) match.
> "James Watson <james@...il.com>", "James Watson <james+a@...il.com>"
>
> Also introduced a new message type FROM_SIGN_OFF_MISMATCH
> for cases 2, 3, 4 and 5.
>
> Link: https://lore.kernel.org/linux-kernel-mentees/c1ca28e77e8e3bfa7aadf3efa8ed70f97a9d369c.camel@perches.com/
> Suggested-by: Joe Perches <joe@...ches.com>
> Signed-off-by: Dwaipayan Ray <dwaipayanray1@...il.com>
> ---
> scripts/checkpatch.pl | 93 +++++++++++++++++++++++++++++++++++--------
> 1 file changed, 77 insertions(+), 16 deletions(-)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 31624bbb342e..124ff9432b51 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -1163,10 +1163,10 @@ sub parse_email {
> }
> }
>
> + $comment = trim($comment);
> $name = trim($name);
> $name =~ s/^\"|\"$//g;
> - $name =~ s/(\s*\([^\)]+\))\s*//;
> - if (defined($1)) {
> + if ($name =~ s/(\s*\([^\)]+\))\s*//) {
> $name_comment = trim($1);
> }
> $address = trim($address);
> @@ -1181,10 +1181,12 @@ sub parse_email {
> }
>
> sub format_email {
> - my ($name, $address) = @_;
> + my ($name, $name_comment, $address, $comment) = @_;
>
> my $formatted_email;
>
> + $name_comment = trim($name_comment);
> + $comment = trim($comment);
> $name = trim($name);
> $name =~ s/^\"|\"$//g;
> $address = trim($address);
> @@ -1197,9 +1199,9 @@ sub format_email {
> if ("$name" eq "") {
> $formatted_email = "$address";
> } else {
> - $formatted_email = "$name <$address>";
> + $formatted_email = "$name$name_comment <$address>";
> }
> -
> + $formatted_email .= "$comment";
> return $formatted_email;
> }
>
> @@ -1207,17 +1209,23 @@ sub reformat_email {
> my ($email) = @_;
>
> my ($email_name, $name_comment, $email_address, $comment) = parse_email($email);
> - return format_email($email_name, $email_address);
> + return format_email($email_name, $name_comment, $email_address, $comment);
> }
>
> sub same_email_addresses {
> - my ($email1, $email2) = @_;
> + my ($email1, $email2, $match_comment) = @_;
>
> my ($email1_name, $name1_comment, $email1_address, $comment1) = parse_email($email1);
> my ($email2_name, $name2_comment, $email2_address, $comment2) = parse_email($email2);
>
> + if ($match_comment != 1) {
> + return $email1_name eq $email2_name &&
> + $email1_address eq $email2_address;
> + }
> return $email1_name eq $email2_name &&
> - $email1_address eq $email2_address;
> + $email1_address eq $email2_address &&
> + $name1_comment eq $name2_comment &&
> + $comment1 eq $comment2;
> }
>
> sub which {
> @@ -2347,6 +2355,7 @@ sub process {
> my $signoff = 0;
> my $author = '';
> my $authorsignoff = 0;
> + my $author_sob = '';
> my $is_patch = 0;
> my $is_binding_patch = -1;
> my $in_header_lines = $file ? 0 : 1;
> @@ -2674,9 +2683,37 @@ sub process {
> if ($line =~ /^\s*signed-off-by:\s*(.*)/i) {
> $signoff++;
> $in_commit_log = 0;
> - if ($author ne '') {
> - if (same_email_addresses($1, $author)) {
> + if ($author ne '' && $authorsignoff != 1) {
> + if (same_email_addresses($1, $author, 1)) {
> $authorsignoff = 1;
> + } else {
> + my $ctx = $1;
> + my ($email_name, $email_comment, $email_address, $comment1) = parse_email($ctx);
> + my ($author_name, $author_comment, $author_address, $comment2) = parse_email($author);
> +
> + if ($email_address eq $author_address && $email_name eq $author_name) {
> + $author_sob = $ctx;
> + $authorsignoff = 2;
> + } elsif ($email_address eq $author_address) {
> + $author_sob = $ctx;
> + $authorsignoff = 3;
> + } elsif ($email_name eq $author_name) {
> + $author_sob = $ctx;
> + $authorsignoff = 4;
> +
> + my $address1 = $email_address;
> + my $address2 = $author_address;
> +
> + if ($address1 =~ /(\S+)\+\S+(\@.*)/) {
> + $address1 = "$1$2";
> + }
> + if ($address2 =~ /(\S+)\+\S+(\@.*)/) {
> + $address2 = "$1$2";
> + }
> + if ($address1 eq $address2) {
> + $authorsignoff = 5;
> + }
> + }
> }
> }
> }
> @@ -2733,7 +2770,7 @@ sub process {
> }
>
> my ($email_name, $name_comment, $email_address, $comment) = parse_email($email);
> - my $suggested_email = format_email(($email_name, $email_address));
> + my $suggested_email = format_email(($email_name, $name_comment, $email_address, $comment));
> if ($suggested_email eq "") {
> ERROR("BAD_SIGN_OFF",
> "Unrecognized email address: '$email'\n" . $herecurr);
> @@ -2743,9 +2780,9 @@ sub process {
> $dequoted =~ s/" </ </;
> # Don't force email to have quotes
> # Allow just an angle bracketed address
> - if (!same_email_addresses($email, $suggested_email)) {
> + if (!same_email_addresses($email, $suggested_email, 0)) {
> WARN("BAD_SIGN_OFF",
> - "email address '$email' might be better as '$suggested_email$comment'\n" . $herecurr);
> + "email address '$email' might be better as '$suggested_email'\n" . $herecurr);
> }
> }
>
> @@ -6891,9 +6928,33 @@ sub process {
> if ($signoff == 0) {
> ERROR("MISSING_SIGN_OFF",
> "Missing Signed-off-by: line(s)\n");
> - } elsif (!$authorsignoff) {
> - WARN("NO_AUTHOR_SIGN_OFF",
> - "Missing Signed-off-by: line by nominal patch author '$author'\n");
> + } elsif ($authorsignoff != 1) {
> + # authorsignoff values:
> + # 0 -> missing sign off
> + # 1 -> sign off identical
> + # 2 -> names and addresses match, comments mismatch
> + # 3 -> addresses match, names different
> + # 4 -> names match, addresses different
> + # 5 -> names match, addresses excluding subaddress details (refer RFC 5233) match
> +
> + my $sob_msg = "'From: $author' != 'Signed-off-by: $author_sob'";
> +
> + if ($authorsignoff == 0) {
> + ERROR("NO_AUTHOR_SIGN_OFF",
> + "Missing Signed-off-by: line by nominal patch author '$author'\n");
> + } elsif ($authorsignoff == 2) {
> + CHK("FROM_SIGN_OFF_MISMATCH",
> + "From:/Signed-off-by: email comments mismatch: $sob_msg\n");
> + } elsif ($authorsignoff == 3) {
> + WARN("FROM_SIGN_OFF_MISMATCH",
> + "From:/Signed-off-by: email name mismatch: $sob_msg\n");
> + } elsif ($authorsignoff == 4) {
> + WARN("FROM_SIGN_OFF_MISMATCH",
> + "From:/Signed-off-by: email address mismatch: $sob_msg\n");
> + } elsif ($authorsignoff == 5) {
> + WARN("FROM_SIGN_OFF_MISMATCH",
> + "From:/Signed-off-by: email subaddress mismatch: $sob_msg\n");
> + }
> }
> }
>
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