From 4e9be6d48e158342c401a994ec8acfee895eac1a Mon Sep 17 00:00:00 2001
From: Erik <erik@montnemery.com>
Date: Thu, 16 Apr 2026 21:00:00 +0200
Subject: [PATCH] Deprecate legacy device tracker

---
 .../components/device_tracker/legacy.py       | 28 ++++++++
 .../components/device_tracker/test_legacy.py  | 64 ++++++++++++++++++-
 2 files changed, 91 insertions(+), 1 deletion(-)

diff --git a/homeassistant/components/device_tracker/legacy.py b/homeassistant/components/device_tracker/legacy.py
index 5923aa2ed45..b91f85955e2 100644
--- a/homeassistant/components/device_tracker/legacy.py
+++ b/homeassistant/components/device_tracker/legacy.py
@@ -6,6 +6,7 @@ import asyncio
 from collections.abc import Callable, Coroutine, Sequence
 from datetime import datetime, timedelta
 import hashlib
+import logging
 from types import ModuleType
 from typing import Any, Final, Protocol, final
 
@@ -82,6 +83,8 @@ from .const import (
     SourceType,
 )
 
+_LOGGER = logging.getLogger(__name__)
+
 SERVICE_SEE: Final = "see"
 
 SOURCE_TYPES = [cls.value for cls in SourceType]
@@ -128,6 +131,8 @@ SERVICE_SEE_PAYLOAD_SCHEMA: Final[vol.Schema] = vol.Schema(
 YAML_DEVICES: Final = "known_devices.yaml"
 EVENT_NEW_DEVICE: Final = "device_tracker_new_device"
 
+DATA_LEGACY_TRACKERS: Final = "device_tracker.legacy_trackers"
+
 
 class SeeCallback(Protocol):
     """Protocol type for DeviceTracker.see callback."""
@@ -243,8 +248,19 @@ async def _async_setup_integration(
     tracker = await get_tracker(hass, config)
     tracker_future.set_result(tracker)
 
+    warned_called_see = False
+
     async def async_see_service(call: ServiceCall) -> None:
         """Service to see a device."""
+        nonlocal warned_called_see
+        if not warned_called_see:
+            _LOGGER.warning(
+                "The %s.%s action is deprecated and will be removed in "
+                "Home Assistant Core 2027.5",
+                DOMAIN,
+                SERVICE_SEE,
+            )
+            warned_called_see = True
         # Temp workaround for iOS, introduced in 0.65
         data = dict(call.data)
         data.pop("hostname", None)
@@ -327,6 +343,18 @@ class DeviceTrackerPlatform:
             try:
                 scanner = None
                 setup: bool | None = None
+
+                legacy_trackers = hass.data.setdefault(DATA_LEGACY_TRACKERS, set())
+                if full_name not in legacy_trackers:
+                    legacy_trackers.add(full_name)
+                    _LOGGER.warning(
+                        "The legacy device tracker platform %s is being set up; legacy "
+                        "device trackers are deprecated and will be removed in Home "
+                        "Assistant Core 2027.5, please migrate to an integration which "
+                        "uses a modern config entry based device tracker",
+                        full_name,
+                    )
+
                 if hasattr(self.platform, "async_get_scanner"):
                     scanner = await self.platform.async_get_scanner(
                         hass, {DOMAIN: self.config}
diff --git a/tests/components/device_tracker/test_legacy.py b/tests/components/device_tracker/test_legacy.py
index c2df3a74770..e6dd04792bd 100644
--- a/tests/components/device_tracker/test_legacy.py
+++ b/tests/components/device_tracker/test_legacy.py
@@ -2,11 +2,20 @@
 
 from unittest.mock import mock_open, patch
 
+import pytest
+
+from homeassistant.components import device_tracker
 from homeassistant.components.device_tracker import legacy
+from homeassistant.const import CONF_PLATFORM
 from homeassistant.core import HomeAssistant
+from homeassistant.setup import async_setup_component
 from homeassistant.util.yaml import dump
 
-from tests.common import patch_yaml_files
+from .common import MockScanner, mock_legacy_device_tracker_setup
+
+from tests.common import assert_setup_component, patch_yaml_files
+
+TEST_PLATFORM = {device_tracker.DOMAIN: {CONF_PLATFORM: "test"}}
 
 
 def test_remove_device_from_config(hass: HomeAssistant) -> None:
@@ -44,3 +53,56 @@ def test_remove_device_from_config(hass: HomeAssistant) -> None:
         "  picture: /local/test2.png\n"
         "  track: true\n"
     )
+
+
+async def test_see_service_deprecation_warning(
+    hass: HomeAssistant,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test deprecation warning when calling device_tracker.see."""
+    mock_legacy_device_tracker_setup(hass, MockScanner())
+    with assert_setup_component(1, device_tracker.DOMAIN):
+        assert await async_setup_component(hass, device_tracker.DOMAIN, TEST_PLATFORM)
+        await hass.async_block_till_done()
+
+    await hass.services.async_call(
+        device_tracker.DOMAIN,
+        legacy.SERVICE_SEE,
+        {"dev_id": "test_device", "location_name": "Work"},
+        blocking=True,
+    )
+
+    assert (
+        "The device_tracker.see action is deprecated and will be removed in "
+        "Home Assistant Core 2027.5"
+    ) in caplog.text
+
+    caplog.clear()
+
+    # Second call should not produce another warning
+    await hass.services.async_call(
+        device_tracker.DOMAIN,
+        legacy.SERVICE_SEE,
+        {"dev_id": "test_device", "location_name": "Work"},
+        blocking=True,
+    )
+
+    assert "deprecated" not in caplog.text
+
+
+async def test_legacy_platform_setup_deprecation_warning(
+    hass: HomeAssistant,
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Test deprecation warning when setting up a legacy device tracker platform."""
+    mock_legacy_device_tracker_setup(hass, MockScanner())
+    with assert_setup_component(1, device_tracker.DOMAIN):
+        assert await async_setup_component(hass, device_tracker.DOMAIN, TEST_PLATFORM)
+        await hass.async_block_till_done()
+
+    assert (
+        "The legacy device tracker platform test.device_tracker is being set up; "
+        "legacy device trackers are deprecated and will be removed in Home "
+        "Assistant Core 2027.5, please migrate to an integration which "
+        "uses a modern config entry based device tracker"
+    ) in caplog.text