linux-kernel - Re: get_maintainer.pl: unexpected behaviour for path/to//file

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Date:   Fri, 15 May 2020 05:31:10 -0700
From:   Joe Perches <joe@...ches.com>
To:     Emil Velikov <emil.l.velikov@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: get_maintainer.pl: unexpected behaviour for path/to//file

On Fri, 2020-05-15 at 11:52 +0100, Emil Velikov wrote:
> Hi Joe,
> 
> Recently I've noticed that get_maintainer behaves differently if there
> is a double, sequential, forward slash in the path.
> 
> AFAICT there should be no distinction between the two. Or at least many
> existing applications and scripts consider them one and the same.
> 
> I've tried fixing this, although my perl isn't quite up-to scratch.
> Is this some weird bug or some intended feature?

Not really an intended feature.
The code counts slashes for directory depth.

I suppose it might be simpler to do this:
---
 scripts/get_maintainer.pl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index 6d973f3685f9..eaaf9373dbcf 100755
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -538,6 +538,7 @@ foreach my $file (@ARGV) {
 	} elsif (!(-f $file)) {
 	    die "$P: file '${file}' not found\n";
 	}
+	$file =~ s@//@/@g;	# compress file double slashes
     }
     if ($from_filename || ($file ne "&STDIN" && vcs_file_exists($file))) {
 	$file =~ s/^\Q${cur_path}\E//;	#strip any absolute path