add downloading script (with md5sum checking and sourceforge downloading support)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@391 3c298f89-4303-0410-b956-a3cf2f4a3e73

scripts/download.pl

@@ -0,0 +1,76 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+
+my $target = shift @ARGV;
+my $filename = shift @ARGV;
+my $md5sum = shift @ARGV;
+my @mirrors = @ARGV;
+
+my $ok;
+
+@mirrors > 0 or die "Syntax: $0 <target dir> <filename> <md5sum> <mirror> [<mirror> ...]\n";
+
+sub download
+{
+	my $mirror = shift;
+	
+	open WGET, "wget -t1 --connect-timeout=20 --read-timeout=15 -O- \"$mirror/$filename\" |" or die "Cannot launch wget.\n";
+	open MD5SUM, "| md5sum > \"$target/$filename.md5sum\"" or die "Cannot launch md5sum.\n";
+	open OUTPUT, "> $target/$filename.dl" or die "Cannot create file $target/$filename.dl: $!\n";
+	my $buffer;
+	while (read WGET, $buffer, 1048576) {
+		print MD5SUM $buffer;
+		print OUTPUT $buffer;
+	}
+	close MD5SUM;
+	close WGET;
+	close OUTPUT;
+	
+	if (($? >> 8) != 0 ) {
+		print STDERR "Download failed.\n";
+		cleanup();
+		return;
+	}
+	
+	my $sum = `cat "$target/$filename.md5sum"`;
+	$sum =~ /^(\w+)\s+/ or die "Could not generate md5sum\n";
+	$sum = $1;
+	
+	if (($md5sum =~ /\w{32}/) and ($sum ne $md5sum)) {
+		print STDERR "MD5 sum of the downloaded file does not match - deleting download.\n";
+		cleanup();
+		return;
+	}
+	
+	unlink "$target/$filename";
+	system("mv \"$target/$filename.dl\" \"$target/$filename\"");
+}
+
+sub cleanup
+{
+	unlink "$target/$filename.dl";
+	unlink "$target/$filename.md5sum";
+}
+
+while (!$ok) {
+	my $mirror = shift @mirrors;
+	$mirror or die "No more mirrors to try - giving up.\n";
+	
+	if ($mirror =~ /^\@SF\/(.+)$/) {
+		my $sfpath = $1;
+		open SF, "wget -t1 -q -O- 'http://prdownloads.sf.net/$sfpath/$filename' |";
+		while (<SF>) {
+			/RADIO NAME=use_default VALUE=(\w+) OnClick="form\.submit\(\)">/ and do {
+				push @mirrors, "http://$1.dl.sourceforge.net/sourceforge/$sfpath";
+			};
+		}
+		close SF;
+	} else {
+		download($mirror);
+	}
+	-f "$target/$filename" and $ok = 1;
+}
+
+$SIG{INT} = \&cleanup;
+