docs: def setCredentialValues(self, username=None, password=None, public_key=None, private_key=None, new=False):
          """Set the values in disk.0.os.credentials.*."""
  
          credentials_base = "disk.0.os.credentials."
          if new:
              credentials_base = "disk.0.os.credentials.new."
  
          if username:
              self.setValue(credentials_base + "username", username)
          if password:
              self.setValue(credentials_base + "password", password)
          if public_key:
              self.setValue(credentials_base + "public_key", public_key)
          if private_key:
              self.setValue(credentials_base + "private_key", private_key)