Re: [PATCH] checkpatch: Allow not using -f with files that are in git

[Joe Perches <joe@perches.com>]

On Mon, 2020-08-24 at 17:09 -0700, Joe Perches wrote:
> If a file exists in git and checkpatch is used without the -f
> flag for scanning a file, then checkpatch will scan the file
> assuming it's a patch and emit:
> 
> ERROR: Does not appear to be a unified-diff format patch
> 
> Change the behavior to assume the -f flag if the file exists
> in git.

Andrew?  ping?

> Signed-off-by: Joe Perches <joe@perches.com>
> ---
>  scripts/checkpatch.pl | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 79fc357b18cd..cdee7cfadc11 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -976,6 +976,16 @@ sub seed_camelcase_includes {
>  	}
>  }
>  
> +sub git_is_single_file {
> +	my ($filename) = @_;
> +
> +	return 0 if ((which("git") eq "") || !(-e "$gitroot"));
> +
> +	my $output = `${git_command} ls-files -- $filename`;
> +	my $count = $output =~ tr/\n//;
> +	return $count eq 1 && $output =~ m{^${filename}$};
> +}
> +
>  sub git_commit_info {
>  	my ($commit, $id, $desc) = @_;
>  
> @@ -1049,6 +1059,9 @@ my $vname;
>  $allow_c99_comments = !defined $ignore_type{"C99_COMMENT_TOLERANCE"};
>  for my $filename (@ARGV) {
>  	my $FILE;
> +	my $is_git_file = git_is_single_file($filename);
> +	my $oldfile = $file;
> +	$file = 1 if ($is_git_file);
>  	if ($git) {
>  		open($FILE, '-|', "git format-patch -M --stdout -1 $filename") ||
>  			die "$P: $filename: git format-patch failed - $!\n";
> @@ -1093,6 +1106,7 @@ for my $filename (@ARGV) {
>  	@modifierListFile = ();
>  	@typeListFile = ();
>  	build_types();
> +	$file = $oldfile if ($is_git_file);
>  }
>  
>  if (!$quiet) {
>