File createyastdeps of Package build

#!/usr/bin/perl -w

################################################################
#
# Copyright (c) 1995-2014 SUSE Linux Products GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or 3 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program (see the file COPYING); if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
################################################################

BEGIN {
  unshift @INC, ($::ENV{'BUILD_DIR'} || '/usr/lib/build');
}

use strict;

use Digest::MD5();
use File::Path ();

use Build ':rpm';
use Build::Susetags;
use Build::Options;

my $cachedir = "/var/cache/build";

my $options = {
  'cachedir' => ':',
  'zypp' => ':',
};

my ($opts, @args) = Build::Options::parse_options($options, @ARGV);
$cachedir = $opts->{'cachedir'} if $opts->{'cachedir'};

for my $url (@args) {
  # XXX: use descrdir/datadir from content file
  my $descrdir = 'suse/setup/descr';
  my $datadir = 'suse';

  my $dir;
  my $baseurl = $url;
  if ($opts->{'zypp'}) {
    $dir =  $opts->{'zypp'};
  } elsif ($url =~ /^(?:ftps?|https?):\/\/([^\/]*)\/?/) {
    my $repoid = Digest::MD5::md5_hex($url);
    $dir = "$cachedir/$repoid/";
    $baseurl .= '/' unless $baseurl =~ /\/$/;
    File::Path::mkpath($dir);
    system("$INC[0]/download", "$dir/", "${baseurl}$descrdir/packages.gz");
    $descrdir = '.';
  } else {
    $dir = $url;
  }
  $dir .= '/' unless $dir =~ /\/$/;
  $baseurl .= '/' unless $baseurl =~ /\/$/;

  my $packages = "$dir$descrdir/packages";
  $packages = "$packages.gz" if ! -e $packages && -e "$packages.gz";
  Build::Susetags::parse($packages, sub {
    my $xurl = $baseurl;
    # multi cd support hack
    $xurl =~ s/1\/$/$_[0]->{'medium'}/ if $_[0]->{'medium'};
    $xurl .= "$datadir/" if $datadir;
    Build::writedeps(\*STDOUT, $_[0], $xurl);
  }, 'addselfprovides' => 1);
}