text: """Extract information about local git repos."""
  from __future__ import print_function
  import tools.local_command as local_command
  
  
  def git_repo_describe(git_dir):
    """Returns describe for git_dir.
  
    Args:
      git_dir: git directory to run describe on.
  
    Returns:
      str with git describe info.
  
    Raises:
      Exception: If return value of the command is non-zero.
    """
    cmd = 'git -C {} describe --always'.format(git_dir)
    retval, stdout = local_command.run_local_command(cmd)
    if retval != 0:
      raise Exception('Command ({}) failed to run:{}'.format(cmd, stdout))
    return stdout.strip()
  
  
  def git_repo_last_commit_id(git_dir):
    """Returns last_commit_id for git_dir.
  
    Args:
      git_dir: git directory to run describe on.
  
    Returns:
      str of last commit_id.
  
    Raises:
      Exception: If return value of the command is non-zero.
    """
    cmd = 'git -C {} log --format="%H" -n 1'.format(git_dir)
    retval, stdout = local_command.run_local_command(cmd)
    if retval != 0:
      raise Exception('Command ({}) failed to run:{}'.format(cmd, stdout))
    return stdout.strip()
  