#!/usr/bin/perl

use strict;
use warnings;
use JSON;
use Getopt::Long;
use File::Which;

my $mpath  = 1;
my $pretty = 0;
my $json   = [];

GetOptions(
  "mpath"  => \$mpath,
  "pretty" => \$pretty
);

my $multipath = which('multipath');

if (not defined $multipath){
  print to_json($json, { pretty => $pretty });
  exit 0;
}

my @dev = qx($multipath -l -v1);
# If command failed (eg no /etc/multipath.conf), then return an empty result
if ($? ne 0){
  print to_json($json, { pretty => $pretty });
  exit 1;
}
foreach (@dev){
  chomp;
  push @{$json}, { '{#MPATH_DEV}' => $_ };
}

print to_json($json, { pretty => $pretty });
exit 0;