File createdebdeps of Package build

#!/usr/bin/perl -w

################################################################
#
# Copyright (c) 1995-2016 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 ':deb';
use Build::Options;
use Build::Deb;
use Build::Debrepo;
use Build::Download;

my $cachedir = "/var/cache/build";
my $options = { 
  'cachedir' => ':',
  'archpath' => ':',
};

#
# supported urls
#
# distribution:   <baseurl>/<dist>/[components]
# flat repo:      <baseurl>/.

my ($opts, @args) = Build::Options::parse_options($options, @ARGV);
$cachedir = $opts->{'cachedir'} if $opts->{'cachedir'};
my $archpath = $opts->{'archpath'};
if (!$archpath) {
  $archpath = `uname -p` || 'unknown';
  chomp $archpath;
}

my $basearch = $archpath;
$basearch =~ s/:.*//;
$basearch = Build::Deb::basearch($basearch);
my $pkgnum = 0;

my $ua = Build::Download::create_ua();

for my $url (@args) {
  die("$url: not an remote debian repo\n") unless $url =~ /^(:?ftps?|https?):\/\/([^\/]*)\/?/;
  my $repoid = Digest::MD5::md5_hex($url);
  my $dir = "$cachedir/$repoid";

  my ($baseurl, $disturl, $components) = Build::Debrepo::parserepourl($url);
  File::Path::mkpath($dir);
  for my $component (@$components) {
    unlink("$dir/Packages.gz");
    if ($component eq '.') {
      Build::Download::download("${disturl}Packages.gz", "$dir/.Packages.gz.$$", "$dir/Packages.gz", 'ua' => $ua, 'retry' => 3);
      die("Packages.gz missing\n") unless -s "$dir/Packages.gz";
    } else {
      Build::Download::download("$disturl$component/binary-$basearch/Packages.gz", "$dir/.Packages.gz.$$", "$dir/Packages.gz", 'ua' => $ua, 'retry' => 3);
      die("Packages.gz missing for basearch $basearch, component $component\n") unless -s "$dir/Packages.gz";
    }
    Build::Debrepo::parse("$dir/Packages.gz", sub {
      $pkgnum++;
      $_[0]->{'id'} = "$pkgnum/0/0";
      Build::writedeps(\*STDOUT, $_[0], $baseurl);
    }, 'addselfprovides' => 1);
  }
}