Updated the update system to support multi channels (stable / pre-release).

ptlinux/settings.py

@@ -13,6 +13,7 @@ from typing import Any
 
 from .locking import launcher_operation_lock
 from .paths import AppPaths
+from .update_resolver import SUPPORTED_CHANNELS
 
 
 SETTINGS_SCHEMA = 1
@@ -47,6 +48,7 @@ class Settings:
 	download_speed_limit_mbps: float | None = None
 	low_bandwidth_mode: bool = False
 	allow_window_resizing: bool = False
+	update_channel: str = "stable"
 
 	@property
 	def source_override(self) -> Path | None:
@@ -176,6 +178,7 @@ def _settings_from_object(value: dict[str, object]) -> Settings:
 			"download_speed_limit_mbps",
 		),
 		low_bandwidth_mode=_boolean(value, "low_bandwidth_mode", False),
+		update_channel=_string(value, "update_channel", "stable"),
 	)
 	_validate(settings)
 	return settings
@@ -273,6 +276,8 @@ def _validate(settings: Settings) -> None:
 		raise ValueError(f"unsupported runtime selection: {settings.runtime}")
 	if settings.proton_sync not in {"auto", "fsync", "esync"}:
 		raise ValueError(f"unsupported Proton synchronization mode: {settings.proton_sync}")
+	if settings.update_channel not in SUPPORTED_CHANNELS:
+		raise ValueError(f"unsupported launcher update channel: {settings.update_channel}")
 	if (
 		settings.download_speed_limit_mbps is not None
 		and (