#!/usr/bin/env perl

delete @ENV{qw(PATH)};
$ENV{PATH} = '/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/sbin';

$val1 = $ARGV[0];
($val1) = $val1 =~ /^([\w]+)$/;

$val2 = $ARGV[1];
($val2) = $val2 =~ /^([\w]+)$/;

$val3 = $ARGV[2];
($val3) = $val3 =~ /^([\w\/-]+)$/;


if (($val1 ne "query") && ($val1 ne "get") && ($val1 ne "index") && ($val1 ne "num_indexes")) {
  print "usage:\n\n";
  print "./query_unix_partitions.pl index\n";
  print "./query_unix_partitions.pl num_indexes\n";
  print "./query_unix_partitions.pl query {device,mount,total,used,available,percent}\n";
  print "./query_unix_partitions.pl get {device,mount,total,used,available,percent} DEVICE\n";
  exit;
}

open(DF, "/bin/df -P -k -l|");

$count=0;
while (<DF>) {
  #/dev/hda2             20157744  18553884    579860  97% /var
  if (/^(\/\S+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)%\s+(\/\S*)$/) {
   my %output = (
    device => $1,
    mount => $6,
    total => $2,
    used => $3,
    available => $4,
    percent => $5
   );

   if ($val1 eq "index") {
    print "$1\n";
   }elsif ($val1 eq "num_indexes") {
    $count++;
   }elsif (($val1 eq "get") && ($val3 eq $1)) {
    print $output{$val2};
   }elsif ($val1 eq "query") {
    print "$output{device}:$output{$val2}\n";
   }
  }
}

close(DF);

if ($val1 eq "num_indexes") {
  print "$count\n";
}