fix #3986: directory plugin: remove trailing slashes

Currently, setting up a directory storage with trailing slashes in the
path results in log messages with double slashes, if this path gets
expanded by an action like vzdump. While this is just a cosmetic
issue, it looks odd and some users might think this is a bug if they
currently investigate some other issue and see such paths.

This patch removes those trailing slashes once the directory storage
class config gets updated.

Signed-off-by: Daniel Herzig <d.herzig@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/PVE/Storage/DirPlugin.pm

@@ -6,6 +6,7 @@ use warnings;
 use Cwd;
 use Encode qw(decode encode);
 use File::Path;
+use File::Spec;
 use IO::File;
 use POSIX;
 
@@ -246,6 +247,8 @@ sub check_config {
     if ($opts->{path} !~ m|^/[-/a-zA-Z0-9_.@]+$|) {
 	die "illegal path for directory storage: $opts->{path}\n";
     }
+    # remove trailing slashes from path
+    $opts->{path} = File::Spec->canonpath($opts->{path});
     return $opts;
 }