#!/usr/bin/perl -w

=head1 NAME     Verify Your Debian Potatoe

=head1 AUTHOR   crazyinsomniac

If it keeps on rainin', 

=head1 LICENSE  the same as that of perl itself (`perl -v')

=cut

use strict;
use Getopt::Std;
use Digest::MD5;

$|= {on => 'nope'};

use vars qw/ %Opt %Dsp $Vv/;

getopts('?hvd:', \%Opt);

$Vv = 1 if exists $Opt{v}; # verbosity (errors and bad sums reported by default)

if( exists $Opt{h} or exists $Opt{'?'} )
{
    goto FIRST_HELP
}
elsif( exists $Opt{d} )
{
    die " Where is your cd !!??\n"
       unless defined $Opt{d}; # missing arg, you ape

    chdir $Opt{d}
        or die "Dang, does the directory '$Opt{d}' really exist?\n";

    die "hmm, can't read md5sums.txt for some reason \n"
        unless -d $Opt{d} and -r $Opt{d};

    &loop_it();

    goto THEEND
}


FIRST_HELP:
{
    print<<"#||#";

    Hello and welcome to Verify Your Debian Potatoe.
    This tool relies on the md5sum.txt file
    being in the root "directory" of said cd,
    and the sums there being correct.
    
    Usage: perl $0 [-?hvd]
    -?      same as below
    -h      prints out this message
    -v      bees verbose (FAILED sums are reported by default)
    -d      /path/to/cd/a/must

#||#
}

sub loop_it
{
    open(FE,'md5sum.txt') or die "Impossible!!! $!";

    my %MD5Sums = map { chomp;  reverse split /\s\s/; } <FE>;

    close(FE);
    
    for my $file(sort keys %MD5Sums)
    {
        print "processing $file \n", if $Vv;

        open(MDFH,$file) or warn "shit, couldn't open $file, neext\n" and next;

        binmode MDFH; # cause I don't know what kind of shit u runnin

        select undef, undef, undef, 0.45; # cause a lot of cdr(w)s choke up

        my $md5 = Digest::MD5->new()->addfile(*MDFH)->hexdigest();

        if ( $md5 ne $MD5Sums{$file} )
        {
            printf "Oh CRIKEY!! -- it's back to the bakery.\n%s\n%s **\n%s\n\n",
                   $file, $MD5Sums{$file}, $md5
        }
        elsif($Vv)
        {
            printf "G.oo00OOD!! -- no problem here\n%s\n%s **\n%s\n\n",
                   $file, $MD5Sums{$file}, $md5
        }
    }
}

THEEND: die q{ levee's goin' to break }