code: def Svn(url, fname, to=None):
      
      if to is None:
          to = str(CFG["tmp_dir"])
  
      src_dir = local.path(to) / fname
      if not source_required(src_dir):
          Copy(src_dir, ".")
          return
  
      from benchbuild.utils.cmd import svn
      svn("co", url, src_dir)
      update_hash(src_dir)
      Copy(src_dir, ".")
docs: Checkout the SVN repo.
  
      Args:
          url (str): The SVN SOURCE repo.
          fname (str): The name of the repo on disk.
          to (str): The name of the TARGET folder on disk.
              Defaults to ``CFG["tmpdir"]``