Re: [PATCH v6] checkpatch.pl: Add SPDX license tag check

[Joe Perches <joe@perches.com>]

On Fri, 2018-02-02 at 09:40 -0600, Rob Herring wrote:
> Add SPDX license tag check based on the rules defined in
> Documentation/process/license-rules.rst. To summarize, SPDX license tags
> should be on the 1st line (or 2nd line in scripts) using the appropriate
> comment style for the file type.
> 
> Cc: Andy Whitcroft <apw@canonical.com>
> Cc: Joe Perches <joe@perches.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Philippe Ombredanne <pombredanne@nexb.com>
> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

> Signed-off-by: Rob Herring <robh@kernel.org>

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

> ---
> v6:
> - Dropped script extension check and only look for #!/... on 1st line. A 
>   text executable file was not reliable either.
> - Support .awk and .tc which may or may not have a #!/.
> - Fixed a typo in script "#!" regex and also match on first /.
> - Add Greg's ack.
> 
>  scripts/checkpatch.pl | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index ba03f17ff662..6db245e5f93b 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2225,6 +2225,8 @@ sub process {
>  
>  	my $camelcase_file_seeded = 0;
>  
> +	my $checklicenseline = 1;
> +
>  	sanitise_line_reset();
>  	my $line;
>  	foreach my $rawline (@rawlines) {
> @@ -2416,6 +2418,7 @@ sub process {
>  			} else {
>  				$check = $check_orig;
>  			}
> +			$checklicenseline = 1;
>  			next;
>  		}
>  
> @@ -2866,6 +2869,30 @@ sub process {
>  			}
>  		}
>  
> +# check for using SPDX license tag at beginning of files
> +		if ($realline == $checklicenseline) {
> +			if ($rawline =~ /^[ \+]\s*\#\!\s*\//) {
> +				$checklicenseline = 2;
> +			} elsif ($rawline =~ /^\+/) {
> +				my $comment = "";
> +				if ($realfile =~ /\.(h|s|S)$/) {
> +					$comment = '/*';
> +				} elsif ($realfile =~ /\.(c|dts|dtsi)$/) {
> +					$comment = '//';
> +				} elsif (($checklicenseline == 2) || $realfile =~ /\.(sh|pl|py|awk|tc)$/) {
> +					$comment = '#';
> +				} elsif ($realfile =~ /\.rst$/) {
> +					$comment = '..';
> +				}
> +
> +				if ($comment !~ /^$/ &&
> +				    $rawline !~ /^\+\Q$comment\E SPDX-License-Identifier: /) {
> +					WARN("SPDX_LICENSE_TAG",
> +					     "Missing or malformed SPDX-License-Identifier tag in line $checklicenseline\n" . $herecurr);
> +				}
> +			}
> +		}
> +
>  # check we are in a valid source file if not then ignore this hunk
>  		next if ($realfile !~ /\.(h|c|s|S|sh|dtsi|dts)$/);
>