die unless -f $ARGV[0];
open(FILE, $ARGV[0]);
$package = "";
$status = "";
$version = "";
$source = "";
$sourceversion = "";
while($l = <FILE>) {
  chomp $l;
  if($l eq "") {
    if(($status =~ /not-installed/) || !$package || !$status || !$version) {
      $package = "";
      $status = "";
      $version = "";
      $source = "";
      $sourceversion = "";
      next;
    }
    $source = $package if(!$source);
    $sourceversion = $version;
    if($source =~ /^(.*?) \((.*?)\)$/) {
      $source = $1;
      $sourceversion = $2;
    }
    if(!$printed{$source}) {
#      print "$source=$sourceversion\n";
      print "deb-src http://snapshot.debian.net/archive pool $source\n";
      $printed{$source} = 1;
    }

    $package = "";
    $status = "";
    $version = "";
    $source = "";
    $sourceversion = "";
  } else {
    if($l =~ /^Package: (.*?)$/) { $package = $1; }
    if($l =~ /^Status: (.*?)$/) { $status = $1; }
    if($l =~ /^Version: (.*?)$/) { $version = $1; }
    if($l =~ /^Source: (.*?)$/) { $source = $1; }
  }
}
close(FILE);