#!/usr/bin/perl -w

=head1 NAME     Verify Your FreeBSD CD

=head1 AUTHOR   crazyinsomniac

When The Levee Breaks

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

=head1 CHECKSUM.MD5

MD5 (compat21.aa) = c44af22b7cc1f19cccdaf7f49841f9de
MD5 (compat21.ab) = d7f1ff74b9ff7b7d21eda01f90ee04e0
...

=cut

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

$|= {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 $Opt{d} for some reason \n"
        unless -d $Opt{d} and -r $Opt{d};

    find(\&loop_it, $Opt{d});

    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
{
    return unless $_ eq 'CHECKSUM.MD5';
    # we only loop it if we got something to work with

    print "$File::Find::name\n----\n" if $Vv;

    open(FE,'CHECKSUM.MD5') or warn "Impossible!!! CHECKSUM.MD5! $!" and return;

    my %MD5Sums = map
                  { chomp;
                    /^MD5 \(([^()]+)\) = ([a-zA-Z0-9]{32})$/ # damn!!! i'm good
                  } <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 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{ I'll have no place to stay. }
__END__
>perl -ne"$\=qq,\n,;print for m/^MD5 \(([^()]+)\) = (.{32})$"' CHECKSUM.MD5
>perl -ne"print map {scalar <>} 1..3 if /^Oh CRIKEY!!/" verify