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

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Date:   Fri, 15 May 2020 10:22:51 -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 05:31 -0700, Joe Perches wrote:
> 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:

Or perhaps a better alternative is:
---
 scripts/get_maintainer.pl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index 6d973f3685f9..484d2fbf5921 100755
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -19,6 +19,7 @@ my $V = '0.26';
 use Getopt::Long qw(:config no_auto_abbrev);
 use Cwd;
 use File::Find;
+use File::Spec::Functions;
 
 my $cur_path = fastgetcwd() . '/';
 my $lk_path = "./";
@@ -532,6 +533,7 @@ if (!@...V) {
 
 foreach my $file (@ARGV) {
     if ($file ne "&STDIN") {
+	$file = canonpath($file);
 	##if $file is a directory and it lacks a trailing slash, add one
 	if ((-d $file)) {
 	    $file =~ s@([^/])$@$1/@;