<VirtualHost *>
  ServerName svn.whatever
  ServerAlias svn
  <Perl>
#!/usr/bin/perl
my $svn_path = "/var/svn";
my $svn_location = "";
my $trac_path = "/var/trac";
opendir(SVN_ROOT, $svn_path) or die "Cannot open $svn_path";

while (my $name = readdir(SVN_ROOT)) {
  if ($name =~ /^[[:alnum:]]+$/) {
    $Location{"$svn_location/$name"} = {
      DAV => "svn",
      SVNPath => "$svn_path/$name",
      AuthType => "Basic",
      AuthName => "\"Subversion login\"",
      AuthUserFile => "$trac_path/access.user",
      AuthGroupFile => "$trac_path/access.group",
      Require => "group $name",
    };
  }
}

closedir(SVN_ROOT);

__END__

  </Perl>
</VirtualHost>