From c30cda9ff23df8afe1a2fcfcef319141d08aa191 Mon Sep 17 00:00:00 2001
From: Josh Hawkins <32435876+hawkeye217@users.noreply.github.com>
Date: Mon, 9 Nov 2026 13:07:31 -0600
Subject: [PATCH] write migrated config atomically

Config migration rewrote config.yml in place with open("w") after each step, so nginx's get_nginx_settings.py, which starts alongside frigate, could read an empty file, get None from yaml.load, and crash on config.get. Each step now writes to a temp file with the original mode and os.replace's it into place.
---
 frigate/util/config.py | 35 +++++++++++++++++------------------
 1 file changed, 17 insertions(+), 18 deletions(-)

diff --git a/frigate/util/config.py b/frigate/util/config.py
index 634016a331..1555a903b4 100644
--- a/frigate/util/config.py
+++ b/frigate/util/config.py
@@ -212,6 +212,14 @@ def find_config_file() -> str:
     return config_path
 
 
+def _write_config(config_file: str, yaml: YAML, config: dict[str, Any]) -> None:
+    tmp_file = f"{config_file}.tmp"
+    with open(tmp_file, "w") as f:
+        yaml.dump(config, f)
+    shutil.copymode(config_file, tmp_file)
+    os.replace(tmp_file, config_file)
+
+
 def migrate_frigate_config(config_file: str):
     """handle migrating the frigate config."""
     logger.info("Checking if frigate config needs migration...")
@@ -259,8 +267,7 @@ def migrate_frigate_config(config_file: str):
     if previous_version < "0.14":
         logger.info(f"Migrating frigate config from {previous_version} to 0.14...")
         new_config = migrate_014(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
         previous_version = "0.14"
 
         logger.info("Migrating export file names...")
@@ -277,56 +284,48 @@ def migrate_frigate_config(config_file: str):
     if previous_version < "0.15-0":
         logger.info(f"Migrating frigate config from {previous_version} to 0.15-0...")
         new_config = migrate_015_0(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
         previous_version = "0.15-0"
 
     if previous_version < "0.15-1":
         logger.info(f"Migrating frigate config from {previous_version} to 0.15-1...")
         new_config = migrate_015_1(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
         previous_version = "0.15-1"
 
     if previous_version < "0.16-0":
         logger.info(f"Migrating frigate config from {previous_version} to 0.16-0...")
         new_config = migrate_016_0(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
         previous_version = "0.16-0"
 
     if previous_version < "0.17-0":
         logger.info(f"Migrating frigate config from {previous_version} to 0.17-0...")
         new_config = migrate_017_0(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
         previous_version = "0.17-0"
 
     if previous_version < "0.18-0":
         logger.info(f"Migrating frigate config from {previous_version} to 0.18-0...")
         new_config = migrate_018_0(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
         previous_version = "0.18-0"
 
     if previous_version < "0.19-0":
         logger.info(f"Migrating frigate config from {previous_version} to 0.19-0...")
         new_config = migrate_019_0(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
         previous_version = "0.19-0"
 
     if needs_models:
         logger.info("Migrating frigate detectors and model to models...")
         new_config = migrate_models(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
 
     if needs_detector_rename:
         logger.info("Migrating renamed frigate detectors...")
         new_config = rename_hailo_detector(new_config)
-        with open(config_file, "w") as f:
-            yaml.dump(new_config, f)
+        _write_config(config_file, yaml, new_config)
 
     logger.info("Finished frigate config migration...")