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

[Joe Perches <joe@perches.com>]

On Sun, 2020-10-18 at 16:03 +0200, Geert Uytterhoeven wrote:
> Hi Joe,
> 
> On Tue, Aug 25, 2020 at 2:12 AM Joe Perches <joe@perches.com> 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.
> > 
> > Signed-off-by: Joe Perches <joe@perches.com>
> 
> Thanks for your patch!
> 
> > --- 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, $desc) = @_;
> > 
> 
> This is now commit f5f613259f3fea81 ("checkpatch: allow not using -f
> with files that are in git"), causing:
> 
>     Global symbol "$gitroot" requires explicit package name (did you
> forget to declare "my $gitroot"?) at scripts/checkpatch.pl line 980.
>     Execution of scripts/checkpatch.pl aborted due to compilation errors.
> 
> FWIW, host system is running Ubuntu 18.04.5 LTS (upgrade to 20.04 LTS
> planned soon ;-).

I believe there is a dependency on another patch
in -next that wasn't pushed to Linus' tree.

commit 5ec1f7de97b26a3fa364bbb31fdd2e42c8e6fa22
Author: Joe Perches <joe@perches.com>
Date:   Thu Oct 8 11:53:44 2020 +1100

    checkpatch: test $GIT_DIR changes

So it'd be better to revert right now until
this other patch is accepted or pushed.