Re: [PATCH] checkpatch: make email address check case insensitive

[Joe Perches <joe@perches.com>]

On Mon, 2021-08-16 at 07:27 -0400, Mimi Zohar wrote:
> Instead of checkpatch requiring the patch author to exactly match the
> signed-off-by tag, commit 48ca2d8ac8a1 ("checkpatch: add new warnings
> to author signoff checks.") safely relaxed this requirement.
> 
> Although the local-part of an email address (local-part@domain), may
> be case sensitive, exploiting the case sensitivity of mailbox
> local-parts impedes interoperability and is discouraged.  Mailbox
> domains follow normal DNS rules and are hence not case sensitive.
> (Refer to https://datatracker.ietf.org/doc/html/rfc5321#section-2.4.)
> 
> Further relax the patch author and signed-off-by tag comparison by
> making the email address check case insensitive.
> 
> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

Acked-by: Joe Perches <joe@perches.com>

> ---
>  scripts/checkpatch.pl | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 461d4221e4a4..1efa2997df62 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2909,10 +2909,10 @@ sub process {
>  					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) {
> +					if (lc $email_address eq lc $author_address && $email_name eq $author_name) {
>  						$author_sob = $ctx;
>  						$authorsignoff = 2;
> -					} elsif ($email_address eq $author_address) {
> +					} elsif (lc $email_address eq lc $author_address) {
>  						$author_sob = $ctx;
>  						$authorsignoff = 3;
>  					} elsif ($email_name eq $author_name) {