From 6f8b98894b2ea417de834af598ff566de16e7137 Mon Sep 17 00:00:00 2001
From: abmantis <amfcalt@gmail.com>
Date: Thu, 12 Jun 2025 20:18:43 +0100
Subject: [PATCH] Stop writing to config dir log file on supervised install

---
 homeassistant/bootstrap.py | 45 +++++++++++++++++++++-----------------
 tests/test_bootstrap.py    | 41 +++++++++++++++++++++++++++-------
 2 files changed, 58 insertions(+), 28 deletions(-)

diff --git a/homeassistant/bootstrap.py b/homeassistant/bootstrap.py
index 55aeaef2554..066c2bd16c5 100644
--- a/homeassistant/bootstrap.py
+++ b/homeassistant/bootstrap.py
@@ -613,34 +613,39 @@ async def async_enable_logging(
         ),
     )
 
+    logger = logging.getLogger()
+    logger.setLevel(logging.INFO if verbose else logging.WARNING)
+
     # Log errors to a file if we have write access to file or config dir
     if log_file is None:
-        err_log_path = hass.config.path(ERROR_LOG_FILENAME)
+        if "SUPERVISOR" in os.environ:
+            _LOGGER.info("Running in Supervisor, not logging to file")
+            err_log_path = None
+        else:
+            err_log_path = hass.config.path(ERROR_LOG_FILENAME)
     else:
         err_log_path = os.path.abspath(log_file)
 
-    err_path_exists = os.path.isfile(err_log_path)
-    err_dir = os.path.dirname(err_log_path)
+    if err_log_path:
+        err_path_exists = os.path.isfile(err_log_path)
+        err_dir = os.path.dirname(err_log_path)
 
-    # Check if we can write to the error log if it exists or that
-    # we can create files in the containing directory if not.
-    if (err_path_exists and os.access(err_log_path, os.W_OK)) or (
-        not err_path_exists and os.access(err_dir, os.W_OK)
-    ):
-        err_handler = await hass.async_add_executor_job(
-            _create_log_file, err_log_path, log_rotate_days
-        )
+        # Check if we can write to the error log if it exists or that
+        # we can create files in the containing directory if not.
+        if (err_path_exists and os.access(err_log_path, os.W_OK)) or (
+            not err_path_exists and os.access(err_dir, os.W_OK)
+        ):
+            err_handler = await hass.async_add_executor_job(
+                _create_log_file, err_log_path, log_rotate_days
+            )
 
-        err_handler.setFormatter(logging.Formatter(fmt, datefmt=FORMAT_DATETIME))
+            err_handler.setFormatter(logging.Formatter(fmt, datefmt=FORMAT_DATETIME))
+            logger.addHandler(err_handler)
 
-        logger = logging.getLogger()
-        logger.addHandler(err_handler)
-        logger.setLevel(logging.INFO if verbose else logging.WARNING)
-
-        # Save the log file location for access by other components.
-        hass.data[DATA_LOGGING] = err_log_path
-    else:
-        _LOGGER.error("Unable to set up error log %s (access denied)", err_log_path)
+            # Save the log file location for access by other components.
+            hass.data[DATA_LOGGING] = err_log_path
+        else:
+            _LOGGER.error("Unable to set up error log %s (access denied)", err_log_path)
 
     async_activate_log_queue_handler(hass)
 
diff --git a/tests/test_bootstrap.py b/tests/test_bootstrap.py
index 9e1f246b551..4c22129b023 100644
--- a/tests/test_bootstrap.py
+++ b/tests/test_bootstrap.py
@@ -88,11 +88,15 @@ async def test_async_enable_logging(
     config_log_file_pattern = get_test_config_dir("home-assistant.log*")
     arg_log_file_pattern = "test.log*"
 
+    def cleanup_log_files() -> None:
+        """Remove all log files."""
+        for f in glob.glob(config_log_file_pattern):
+            os.remove(f)
+        for f in glob.glob(arg_log_file_pattern):
+            os.remove(f)
+
     # Ensure we start with a clean slate
-    for f in glob.glob(arg_log_file_pattern):
-        os.remove(f)
-    for f in glob.glob(config_log_file_pattern):
-        os.remove(f)
+    cleanup_log_files()
     assert len(glob.glob(config_log_file_pattern)) == 0
     assert len(glob.glob(arg_log_file_pattern)) == 0
 
@@ -121,10 +125,31 @@ async def test_async_enable_logging(
 
     assert "Error rolling over log file" in caplog.text
 
-    for f in glob.glob(arg_log_file_pattern):
-        os.remove(f)
-    for f in glob.glob(config_log_file_pattern):
-        os.remove(f)
+    cleanup_log_files()
+
+    with (
+        patch.dict(os.environ, {"SUPERVISOR": "1"}),
+        patch("logging.getLogger"),
+        patch(
+            "homeassistant.bootstrap.async_activate_log_queue_handler"
+        ) as mock_async_activate_log_queue_handler,
+    ):
+        await bootstrap.async_enable_logging(hass)
+        mock_async_activate_log_queue_handler.assert_called_once()
+        # On Supervisor, the default log file should not be created
+        assert len(glob.glob(config_log_file_pattern)) == 0
+
+        mock_async_activate_log_queue_handler.reset_mock()
+        await bootstrap.async_enable_logging(
+            hass,
+            log_rotate_days=5,
+            log_file="test.log",
+        )
+        mock_async_activate_log_queue_handler.assert_called_once()
+        # Even on Supervisor, the log file should be created if explicitly set
+        assert len(glob.glob(arg_log_file_pattern)) > 0
+
+    cleanup_log_files()
 
 
 async def test_load_hassio(hass: HomeAssistant) -> None: