Re: [PATCH v4] checkpatch.pl: Add SPDX license tag check

[Joe Perches <joe@perches.com>]

On Wed, 2017-12-20 at 17:46 -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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Philippe Ombredanne <pombredanne@nexb.com>
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
> Thomas, if you are inclined and Joe is happy with this, can you add this 
> on top of your series adding license-rules.rst.
> 
> v4:
> - Reference license-rules.rst
> - Add comment style checks based on file types
> - Check .rst files
> 
> v3:
> - Since we specify that the tag goes on the 1st or 2nd line, the logic
>   can be greatly simplified compared to v2 because we can just use the
>   line number. And now the check is improved too.
> 
>  scripts/checkpatch.pl | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -2866,6 +2866,31 @@ sub process {
>  			}
>  		}
>  
> +# check for using SPDX license tag at beginning of files
> +		if ($rawline =~ /^\+/ && !($realline == 1 && $rawline =~ /^[\s\+]#!/)) {

This test will enter this block for every added line of the patch.

Needs to be /^[ \+]/ and not [\t\+] and probably should just be ^\+

I'd probably have something like
	my $checklicenseline = 1;
	
at the start of sub process

and use something

		if ($realline == $checklicenseline) {
			if ($realfile =~ /\.(?:sh|pl|py)/ && $rawline =~ /\[ \+]\s*\!\#/) {
				$checklicenseline = 2;
			} elsif (etc...) {
			}
		}

> +			} elsif ($realfile =~ /\.rst$/) {
> +				$comment = '..';

\.\.

What about .txt, .json, .cocci, and .awk ?