#!/usr/bin/env perl
use warnings;
use strict;  

# Description: get information on md (RAID)

our $VERSION = '1.0';

# Linux MD (RAID)
# Author: R. W. Rodolico
# Date:  2017-11-24

# get some information on RAID arrays covered by mdadm

BEGIN {
   push @INC, shift;
}

use library;

# category we will use for all values found
# see sysinfo for a list of valid categories
my $CATEGORY = 'diskinfo';

# run the commands necessary to do whatever you want to do
# The library entered above has some helper routines
# validCommandOnSystem -- passed a name, returns the fully qualified path or '' if it does not exist
# cleanUp - passed a delimiter and a string, does the following (delimiter can be '')
#           chomps the string (removes trailing newlines)
#           removes all text BEFORE the delimiter, the delimiter, and any whitespace
#           thus, the string 'xxI Am x  a weird string' with a newline will become
#           'a weird string' with no newline

# now, return the tab delimited output (to STDOUT). $CATEGORY is the first
# item, name as recognized by sysinfo is the second and the value is
# the last one. For multiple entries, place on separate lines (ie, newline separated)

# check for commands we want to run
my %commands = ( 
                  'mdadm' => '',
                  'fdisk' => ''
               );

# check the commands for validity
foreach my $command ( keys %commands ) {
   $commands{$command} = &validCommandOnSystem( $command );
}

# bail if we don't have the commands we need
exit 1 unless $commands{'mdadm'};

exit 1 unless -e '/proc/mdstat';

open MD,'</proc/mdstat' or exit 1;
my @temp = <MD>;
close MD;

my @results;

while ( my $line = shift @temp ) {
   chomp $line;
   if ( $line =~ m/^(md\d+)\s+:\s+(.*)$/ ) {
      my $device = $1;
      my @components = split( /\s+/, $2 );
      shift @components;
      push @results, "$CATEGORY\t$device\tlevel\t" . shift(@components);
      push @results, "$CATEGORY\t$device\tcomponents\t" . join( " ", @components );
      my $temp = qx( $commands{mdadm} --detail /dev/$device | grep 'Array Size' | cut -d':' -f2 | cut -d' ' -f2 );
      chomp $temp;
      push @results, "$CATEGORY\t$device\tsize\t$temp";
   }
}

print join( "\n", @results ) . "\n";

exit 0;