def METHOD_NAME(self) -> tuple:
    root_device = self.device_map['root'].get_device()
    boot_device = root_device
    efi_device = None
    if 'boot' in self.device_map:
        boot_device = self.device_map['boot'].get_device()
    if 'readonly' in self.device_map:
        root_device = self.device_map['readonly'].get_device()
    if 'efi' in self.device_map:
        efi_device = self.device_map['efi'].get_device()
    return (root_device, boot_device, efi_device)