Configure a Linux user account.

    Args:
      user: string, the name of the Linux user account to create.

    Returns:
      bool, True if user creation succeeded.

def _AddUser(self, user):
    """Configure a Linux user account.

    Args:
      user: string, the name of the Linux user account to create.

    Returns:
      bool, True if user creation succeeded.
    """
    self.logger.info('Creating a new user account for %s.', user)

    command = self.useradd_cmd.format(user=user)
    try:
      subprocess.check_call(command.split(' '))
    except subprocess.CalledProcessError as e:
      self.logger.warning('Could not create user %s. %s.', user, str(e))
      return False
    else:
      self.logger.info('Created user account %s.', user)
      return True