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        push @{$fullstats->{history}}, $stats;
        # YAML.pm 0.62 is unacceptably slow with 999;
        # YAML::Syck 0.82 has no noticable performance problem with 999;
        my $ftpstats_size = $CPAN::Config->{ftpstats_size};
        $ftpstats_size = 99 unless defined $ftpstats_size;
        my $ftpstats_period = $CPAN::Config->{ftpstats_period} || 14;
        while (
               @{$fullstats->{history} || []}
               &&
               (
                @{$fullstats->{history}} > $ftpstats_size
                || $time - $fullstats->{history}[0]{start} > 86400*$ftpstats_period
               )
              ) {
            shift @{$fullstats->{history}}
        }
        push @debug, scalar @{$fullstats->{history}} if $sdebug;
        push @debug, time if $sdebug;
        push @debug, scalar localtime($fullstats->{history}[0]{start}) if $sdebug;
        # need no eval because if this fails, it is serious
        my $sfile = File::Spec->catfile($CPAN::Config->{cpan_home},"FTPstats.yml");
        CPAN->_yaml_dumpfile("$sfile.$$",$fullstats);
        if ( $sdebug ) {
            local $CPAN::DEBUG = 512; # FTP
            push @debug, time;
            CPAN->debug(sprintf("DEBUG history: before_read[%d]before[%d]at[%d]".
                                "after[%d]at[%d]oldest[%s]dumped backat[%d]",
                                @debug,
                               ));
        }
        # Win32 cannot rename a file to an existing filename
        unlink($sfile) if ($^O eq 'MSWin32' or $^O eq 'os2');
	_copy_stat($sfile, "$sfile.$$") if -e $sfile;
        rename "$sfile.$$", $sfile
            or $CPAN::Frontend->mywarn("Could not rename '$sfile.$$' to '$sfile': $!\nGiving up\n");
    }
}

# Copy some stat information (owner, group, mode and) from one file to
# another.
# This is a utility function which might be moved to a utility repository.
#-> sub CPAN::FTP::_copy_stat
sub _copy_stat {
    my($src, $dest) = @_;
    my @stat = stat($src);
    if (!@stat) {
	$CPAN::Frontend->mywarn("Can't stat '$src': $!\n");
	return;
    }

    eval {
	chmod $stat[2], $dest
	    or $CPAN::Frontend->mywarn("Can't chmod '$dest' to " . sprintf("0%o", $stat[2]) . ": $!\n");
    };
    warn $@ if $@;
    eval {
	chown $stat[4], $stat[5], $dest
	    or do {
		my $save_err = $!; # otherwise it's lost in the get... calls
		$CPAN::Frontend->mywarn("Can't chown '$dest' to " .
					(getpwuid($stat[4]))[0] . "/" .
					(getgrgid($stat[5]))[0] . ": $save_err\n"
				       );
	    };
    };
    warn $@ if $@;
}

# if file is CHECKSUMS, suggest the place where we got the file to be
# checked from, maybe only for young files?
#-> sub CPAN::FTP::_recommend_url_for
sub _recommend_url_for {
    my($self, $file, $urllist) = @_;
    if ($file =~ s|/CHECKSUMS(.gz)?$||) {
        my $fullstats = $self->_ftp_statistics();
        my $history = $fullstats->{history} || [];
        while (my $last = pop @$history) {
            last if $last->{end} - time > 3600; # only young results are interesting
            next unless $last->{file}; # dirname of nothing dies!
            next unless $file eq dirname($last->{file});
            return $last->{thesiteurl};
        }
    }
    if ($CPAN::Config->{randomize_urllist}
        &&
        rand(1) < $CPAN::Config->{randomize_urllist}
       ) {
        $urllist->[int rand scalar @$urllist];
    } else {
        return ();
    }
}

#-> sub CPAN::FTP::_get_urllist
sub _get_urllist {
    my($self, $with_defaults) = @_;
    $with_defaults ||= 0;
    CPAN->debug("with_defaults[$with_defaults]") if $CPAN::DEBUG;

    $CPAN::Config->{urllist} ||= [];
    unless (ref $CPAN::Config->{urllist} eq 'ARRAY') {
        $CPAN::Frontend->mywarn("Malformed urllist; ignoring.  Configuration file corrupt?\n");
        $CPAN::Config->{urllist} = [];
    }
    my @urllist = grep { defined $_ and length $_ } @{$CPAN::Config->{urllist}};
    push @urllist, @CPAN::Defaultsites if $with_defaults;
    for my $u (@urllist) {
        CPAN->debug("u[$u]") if $CPAN::DEBUG;
        if (UNIVERSAL::can($u,"text")) {
            $u->{TEXT} .= "/" unless substr($u->{TEXT},-1) eq "/";
        } else {
            $u .= "/" unless substr($u,-1) eq "/";
            $u = CPAN::URL->new(TEXT => $u, FROM => "USER");
        }
    }
    \@urllist;
}

#-> sub CPAN::FTP::ftp_get ;
sub ftp_get {
    my($class,$host,$dir,$file,$target) = @_;