Re: [PATCH] checkpatch: warn for non-standard fixes tag style

[Joe Perches <joe@perches.com>]

On Mon, 2022-08-29 at 17:53 +0200, Niklas Söderlund wrote:
> Add a warning for fixes tags that does not fall in line with the
> standards specified by the community.
> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund@corigine.com>
> Reviewed-by: Simon Horman <simon.horman@corigine.com>
> Reviewed-by: Louis Peens <louis.peens@corigine.com>
> ---
>  Documentation/dev-tools/checkpatch.rst |  6 ++++
>  scripts/checkpatch.pl                  | 41 ++++++++++++++++++++++++++
>  2 files changed, 47 insertions(+)
> 
> diff --git a/Documentation/dev-tools/checkpatch.rst b/Documentation/dev-tools/checkpatch.rst
> index b52452bc2963..8164f362a2fc 100644
> --- a/Documentation/dev-tools/checkpatch.rst
> +++ b/Documentation/dev-tools/checkpatch.rst
> @@ -612,6 +612,12 @@ Commit message
>  
>      See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
>  
> +  **BAD_FIXES_TAG**
> +    The fixes line does not fall in line with the standards specified by the
> +    community.
> +
> +    See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
> +
>  
>  Comparison style
>  ----------------
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 79e759aac543..9b8cdc582fb5 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -3140,6 +3140,47 @@ sub process {
>  			}
>  		}
>  
> +# Check Fixes: styles is correct
> +		if (!$in_header_lines && $line =~ /^fixes:/i) {
> +			my $orig_commit = "";
> +			my $id = "0123456789ab";
> +			my $title = "commit title";
> +			my $tag_case = 1;
> +			my $tag_space = 1;
> +			my $id_length = 1;
> +			my $id_case = 1;
> +			my $title_has_quotes = 0;
> +
> +			if ($line =~ /(fixes:)\s+([0-9a-f]{5,})\s+($balanced_parens)/i) {

Maybe use fixes:? so the colon is not required in poorly formed uses

> +				my $tag = $1;
> +				$orig_commit = $2;
> +				$title = $3;
> +
> +				$tag_case = 0 if $tag eq "Fixes:";
> +				$tag_space = 0 if ($line =~ /^fixes: [0-9a-f]{5,} ($balanced_parens)/i);

fixes:? here too

Pity there's no simple way to consolidate this git commit test block
with the existing git id commit block.

> +
> +				$id_length = 0 if ($orig_commit =~ /^[0-9a-f]{12}$/i);
> +				$id_case = 0 if ($orig_commit !~ /[A-F]/);
> +
> +				# Always strip leading/trailing parens then double quotes if existing
> +				$title = substr($title, 1, -1);
> +				if ($title =~ /^".*"$/) {
> +					$title = substr($title, 1, -1);
> +					$title_has_quotes = 1;
> +				}
> +			}
> +
> +			($id, $title) = git_commit_info($orig_commit, $id,
> +							$title);
> +
> +			if ($tag_case || $tag_space || $id_length || $id_case ||
> +			    !$title_has_quotes) {
> +				WARN("BAD_FIXES_TAG",
> +				     "Please use correct Fixes: style 'Fixes: <12 chars of sha1> (\"<title line>\")' - ie: 'Fixes: $id (\"$title\")'\n" . $herecurr);
> +
> +			}
> +		}
> +
>  # Check email subject for common tools that don't need to be mentioned
>  		if ($in_header_lines &&
>  		    $line =~ /^Subject:.*\b(?:checkpatch|sparse|smatch)\b[^:]/i) {