scripts/download.pl

   1 #!/usr/bin/perl
   2 use strict;
   3 use warnings;
   4
   5 my $target = shift @ARGV;
   6 my $filename = shift @ARGV;
   7 my $md5sum = shift @ARGV;
   8 my @mirrors = @ARGV;
   9
  10 my $ok;
  11
  12 @mirrors > 0 or die "Syntax: $0 <target dir> <filename> <md5sum> <mirror> [<mirror> ...]\n";
  13
  14 sub download
  15 {
  16         my $mirror = shift;
  17
  18         open WGET, "wget -t1 --timeout=20 -O- \"$mirror/$filename\" |" or die "Cannot launch wget.\n";
  19         open MD5SUM, "| md5sum > \"$target/$filename.md5sum\"" or die "Cannot launch md5sum.\n";
  20         open OUTPUT, "> $target/$filename.dl" or die "Cannot create file $target/$filename.dl: $!\n";
  21         my $buffer;
  22         while (read WGET, $buffer, 1048576) {
  23                 print MD5SUM $buffer;
  24                 print OUTPUT $buffer;
  25         }
  26         close MD5SUM;
  27         close WGET;
  28         close OUTPUT;
  29
  30         if (($? >> 8) != 0 ) {
  31                 print STDERR "Download failed.\n";
  32                 cleanup();
  33                 return;
  34         }
  35
  36         my $sum = `cat "$target/$filename.md5sum"`;
  37         $sum =~ /^(\w+)\s+/ or die "Could not generate md5sum\n";
  38         $sum = $1;
  39
  40         if (($md5sum =~ /\w{32}/) and ($sum ne $md5sum)) {
  41                 print STDERR "MD5 sum of the downloaded file does not match - deleting download.\n";
  42                 cleanup();
  43                 return;
  44         }
  45
  46         unlink "$target/$filename";
  47         system("mv \"$target/$filename.dl\" \"$target/$filename\"");
  48         cleanup();
  49 }
  50
  51 sub cleanup
  52 {
  53         unlink "$target/$filename.dl";
  54         unlink "$target/$filename.md5sum";
  55 }
  56
  57 while (!$ok) {
  58         my $mirror = shift @mirrors;
  59         $mirror or die "No more mirrors to try - giving up.\n";
  60
  61         if ($mirror =~ /^\@SF\/(.+)$/) {
  62                 my $sfpath = $1;
  63                 open SF, "wget -t1 -q -O- 'http://prdownloads.sf.net/$sfpath/$filename' |";
  64                 while (<SF>) {
  65                         /RADIO NAME=use_default VALUE=(\w+) OnClick="form\.submit\(\)">/ and do {
  66                                 push @mirrors, "http://$1.dl.sourceforge.net/sourceforge/$sfpath";
  67                         };
  68                 }
  69                 close SF;
  70         } else {
  71                 download($mirror);
  72         }
  73         -f "$target/$filename" and $ok = 1;
  74 }
  75
  76 $SIG{INT} = \&cleanup;
  77