code: def _format_commit(commit, scheme):
      return f"{scheme.name}:{commit}"
  
imports: import collections
  import logging
  import re
  import os
  import subprocess
  from guild import config
  from guild import file_util
  from guild import util
  from guild.file_util import FileSelectRule
label_desc: Use image node_id 4 for calling a global function with example usage: _format_commit(commit, scheme) and returns: scheme, str, commit