Fix errors loading settings when profiles file can't be read (#15602)

src/prefect/settings.py

@@ -370,7 +370,16 @@ def __init__(self, settings_cls: Type[BaseSettings]):
  def _load_profile_settings(self) -> Dict[str, Any]:
  """Helper method to load the profile settings from the profiles.toml file"""
 
- all_profile_data = toml.load(self.profiles_path)
+ if not self.profiles_path.exists():
+ return {}
+
+ try:
+ all_profile_data = toml.load(self.profiles_path)
+ except toml.TomlDecodeError:
+ warnings.warn(
+ f"Failed to load profiles from {self.profiles_path}. Please ensure the file is valid TOML."
+ )
+ return {}
 
  if (
  sys.argv[0].endswith("/prefect")

tests/test_settings.py

@@ -254,6 +254,23 @@ def test_include_secrets(self):
  == "test"
  )
 
+ def test_loads_when_profile_path_does_not_exist(self, monkeypatch):
+ monkeypatch.setenv("PREFECT_PROFILES_PATH", str(Path.home() / "nonexistent"))
+ monkeypatch.delenv("PREFECT_TEST_MODE", raising=False)
+ monkeypatch.delenv("PREFECT_UNIT_TEST_MODE", raising=False)
+ assert Settings().test_setting == "FOO"
+
+ def test_loads_when_profile_path_is_not_a_toml_file(self, monkeypatch, tmp_path):
+ monkeypatch.setenv("PREFECT_PROFILES_PATH", str(tmp_path / "profiles.toml"))
+ monkeypatch.delenv("PREFECT_TEST_MODE", raising=False)
+ monkeypatch.delenv("PREFECT_UNIT_TEST_MODE", raising=False)
+
+ with open(tmp_path / "profiles.toml", "w") as f:
+ f.write("Ceci n'est pas un fichier toml")
+
+ with pytest.warns(UserWarning, match="Failed to load profiles from"):
+ assert Settings().test_setting == "FOO"
+
 
 class TestSettingAccess:
  def test_get_value_root_setting(self):