code: def execute_node(self, node, verbatim_exe = False):
          
          node.executed = True
  
          # Check that the PFN is for a file or path
          if node.executable.needs_fetching:
              try:
                  # The pfn may have been marked local...
                  pfn = node.executable.get_pfn()
              except:
                  # or it may have been marked nonlocal.  That's
                  # fine, we'll resolve the URL and make a local
                  # entry.
                  pfn = node.executable.get_pfn('nonlocal')
  
              resolved = resolve_url(pfn, permissions=stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
              node.executable.clear_pfns()
              node.executable.add_pfn(urlparse.urljoin('file:',
                                      urllib.pathname2url(
                                      resolved)), site='local')
  
          cmd_list = node.get_command_line()
  
          # Must execute in output directory.
          curr_dir = os.getcwd()
          out_dir = node.executable.out_dir
          os.chdir(out_dir)
  
          # Make call
          make_external_call(cmd_list, out_dir=os.path.join(out_dir, 'logs'),
                                       out_basename=node.executable.name)
          # Change back
          os.chdir(curr_dir)
  
          for fil in node._outputs:
              fil.node = None
              fil.PFN(urlparse.urljoin('file:',
                      urllib.pathname2url(fil.storage_path)),
                      site='local')
docs: Execute this node immediately on the local machine