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Re: ftp1.us.debian.org and FTP mirrors

  Lukas>  Once someone posted this script to find the fastest debian mirror,
  Lukas> which could be used in some way in the postinst of apt:

IIRC Chris Lameter wrote this as part of one of his misc. utility packages.
I rewrote it in perl (and added a thing or two) as part of the mirror package
which installs it under the name 'debian-mirrors'. As it's short and sweet, I
include it here:

# debian-mirrors	measure ping time to all mirrors in README.mirrors
# downloads README.mirrors from ftp.debian.org (but not if a local file is
# pointed to), runs fping on all Debian mirrors, sorts the result by ping 
# time and output the 'n' (default is 20) fastest
# Written by Dirk Eddelbuettel <edd@debian.org> and released under the GPL
# $Id: debian-mirrors.pl,v 1.3 1998/02/19 02:12:02 edd Exp $

## Yes, Net::FTP is much cooler, but we don't want to depend on libnet-perl
## 'ftp.pl' is provided by the mirror package
unshift( @INC, "/usr/lib/mirror" );
require 'ftp.pl';

#use strict;			# doesn't work with ftp.pl
use English;
use File::Basename;
use vars qw($opt_h $opt_f $opt_v);
use Getopt::Std;
use IPC::Open2;

my $tempfile = "/tmp/".$file."-".$$;
my $readfrom = $tempfile;
my $max = 20;
$PROGRAM_NAME =~ s|.*/||;	# strip everything before last slash

getopts('hf:n:v') or die("Try `$PROGRAM_NAME -h` for help screen.\n");

if ($opt_h or $#ARGV != -1) {
    print "Usage:\n  $PROGRAM_NAME [options]\n";
    print "Options:\n";
    print "  -f file\tpoint to local version README.mirrors\n";
    print "  -n max\tmaximum number of mirrors to show\n";
    print "  -v\t\tverbose operation\n";
    print "  -h\t\tshow this help\n";
    exit 0;

$max = $opt_n if ($opt_n);
print "Max is set to $max\n" if $opt_v;

if ( ! $opt_f ) {
    my $hostname = "ftp.debian.org";
    my $account = "ftp";
    my $password = "user\@debian.org";
    my $directory = "/pub/debian";
    my $filename = "README.mirrors";
    print "Retrieving ", $filename, " for analysis.";
    ftp::debug(1) if $opt_v;	# for debugging output
    ftp::open($hostname,21,0,1) or die "No ftp connection\n";   
    ftp::login($account, $password) or die "Couldn't login\n";
    ftp::cwd($directory) or die "Cannot cd to $directory\n";
    ftp::get($filename, $tempfile, 0) or die "Could not get $file\n";
} else {
    die "File $opt_f does not exist." unless -f $opt_f;
    $readfrom = $opt_f;

print "Measuring ping times to all Debian mirror sites. " if $opt_v;
print "Please be patient.\n" if $opt_v;
my ($mirror,$path,$time);

open(DATA, $readfrom) or die "Cannot open $filename\n";

open2("PINGOUT", "PINGIN", "fping -ae") or die "Cannot start fping(1)\n";;

while (<DATA>) {
    if (($mirror,$path) = ($ARG =~ m|^\s*(\S*\.\S*\.\S*.*):(/\S*)\s.*|)) {
	print "Pinging $mirror \n" if $opt_v;
	print PINGIN "$mirror\n"; # if ($mirror =~ m/.*\.edu$/);

open2("SORTOUT", "SORTIN", "sort -n") or die "Cannot start sort(1)\n";

while (<PINGOUT>) {
    ($mirror,$time) = ($ARG =~ m|^(\S*)\s*\((\d*) msec\)|);
    print "fping reports $time for $mirror\n" if $opt_v;
    print SORTIN "$time $mirror\n";

my $i=1;
while (<SORTOUT>)   {
    print "$_"; 
    last if ($i++ == $max);

Linux is not only free; it is, arguably, a better operating system, offering
a degree of stability and an ability to scale up that NT cannot match.
                                             -- The Economist, Oct 3, 1998

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