feat: the firmware a vendor offers, as a fact (4.16.0)

FirmwareOfferMixin.get_firmware_offer() -> FirmwareOfferDict
{current_version, latest_version, newer, download_url?}: what runs and
the newest firmware the vendor offers, from its download catalogue or
the device's own update check. Comparing vendor version strings stays
with the driver, so it says whether the offer is newer; whether that is a
warning is the application's call (NetOrk/netork#1111). Declared only.

napalm_device_types/__init__.py

@@ -90,6 +90,7 @@ from napalm_device_types.fixes import (
     run_fix_steps,
 )
 from napalm_device_types.health_metrics import HealthMetricsMixin
+from napalm_device_types.firmware import FirmwareOfferMixin
 from napalm_device_types.licenses import LicenseMixin
 from napalm_device_types.host_reboot import HostRebootMixin
 from napalm_device_types.interface_filter import InterfaceFilterMixin
@@ -116,6 +117,7 @@ from napalm_device_types.models import (
     PowerAction,
     PowerStateDict,
     HypervisorHostDict,
+    FirmwareOfferDict,
     LicenseDict,
     FixResultDict,
     FixStepDict,
@@ -171,6 +173,8 @@ from napalm_device_types.switch import SwitchDriver
 
 __all__ = [
     "HypervisorHostDict",
+    "FirmwareOfferDict",
+    "FirmwareOfferMixin",
     "LicenseDict",
     "LicenseMixin",
     "EnsurePackageMixin",

napalm_device_types/firmware.py

@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+"""The firmware a vendor offers for a device.
+
+A fact for the caller (docs/STRUCTURE.md): a driver may know the newer firmware
+from the vendor's download catalogue or the device's own update check; whether
+running an older one is a problem is decided above the driver. Comparing the
+vendor's version strings is vendor knowledge, so the driver says itself whether
+the offer is newer. Declared only; a driver that can tell implements it.
+"""
+
+from __future__ import annotations
+
+from typing import Optional, TYPE_CHECKING
+
+from napalm_device_types.models import FirmwareOfferDict
+
+
+class FirmwareOfferMixin:
+    if TYPE_CHECKING:  # pragma: no cover - declared for type checkers only
+
+        def get_firmware_offer(self) -> Optional[FirmwareOfferDict]:
+            """The firmware running and the newest the vendor offers.
+
+            None when the driver cannot tell for this device (an unknown model,
+            a catalogue that did not answer).
+
+            Example::
+
+                {"current_version": "1.0.2.10", "latest_version": "1.0.2.12",
+                 "newer": True, "download_url": "https://.../GS308E_1.0.2.12.zip"}
+            """
+            ...

napalm_device_types/models.py

@@ -1015,6 +1015,16 @@ class LicenseDict(TypedDict):
     withholds: NotRequired[List[str]]
 
 
+class FirmwareOfferDict(TypedDict):
+    """The firmware a device runs and the newest its vendor offers
+    (``FirmwareOfferMixin.get_firmware_offer``). A fact, not a judgement."""
+
+    current_version: str
+    latest_version: str
+    newer: bool  # the offer is newer than what runs, by the vendor's versioning
+    download_url: NotRequired[str]
+
+
 class HypervisorHostDict(TypedDict):
     """One host of a hypervisor or cluster (``HypervisorDriver.get_hypervisor_hosts``)."""