Desktop: Linux: Move keychain support behind an off-by-default feature flag

packages/lib/models/settings/builtInMetadata.ts

@@ -1576,6 +1576,20 @@ const builtInMetadata = (Setting: typeof SettingType) => {
 			isGlobal: true,
 		},
 
+		'featureFlag.linuxKeychain': {
+			value: false,
+			type: SettingItemType.Bool,
+			public: true,
+			storage: SettingStorage.File,
+			appTypes: [AppType.Desktop],
+			label: () => 'Enable keychain support',
+			description: () => 'This is an experimental setting to enable keychain support on Linux',
+			show: () => shim.isLinux(),
+			section: 'general',
+			isGlobal: true,
+			advanced: true,
+		},
+
 
 		// 'featureFlag.syncAccurateTimestamps': {
 		// 	value: false,

packages/lib/services/SettingUtils.ts

@@ -34,6 +34,13 @@ export async function loadKeychainServiceAndSettings(keychainServiceDrivers: Key
 	Setting.setKeychainService(KeychainService.instance());
 	await Setting.load();
 
+	// Using Linux with the keychain has been observed to cause all secure settings to be lost
+	// on Fedora 40 + GNOME. (This may have been related to running multiple Joplin instances).
+	// For now, make saving to the keychain opt-in until more feedback is received.
+	if (shim.isLinux() && !Setting.value('featureFlag.linuxKeychain')) {
+		KeychainService.instance().readOnly = true;
+	}
+
 	// This is part of the migration to the new sync target info. It needs to be
 	// set as early as possible since it's used to tell if E2EE is enabled, it
 	// contains the master keys, etc. Once it has been set, it becomes a noop

packages/lib/versionInfo.ts

@@ -1,9 +1,13 @@
+import Logger from '@joplin/utils/Logger';
 import { _ } from './locale';
 import Setting from './models/Setting';
 import { reg } from './registry';
+import KeychainService from './services/keychain/KeychainService';
 import { Plugins } from './services/plugins/PluginService';
 import shim from './shim';
 
+const logger = Logger.create('versionInfo');
+
 export interface PackageInfo {
 	name: string;
 	version: string;
@@ -70,15 +74,21 @@ export default function versionInfo(packageInfo: PackageInfo, plugins: Plugins)
 		copyrightText.replace('YYYY', `${now.getFullYear()}`),
 	];
 
+	let keychainSupported = false;
+	try {
+		// To allow old keys to be read, certain apps allow read-only keychain access:
+		keychainSupported = Setting.value('keychain.supported') >= 1 && !KeychainService.instance().readOnly;
+	} catch (error) {
+		logger.error('Failed to determine if keychain is supported', error);
+	}
+
 	const body = [
 		_('%s %s (%s, %s)', p.name, p.version, Setting.value('env'), shim.platformName()),
 		'',
 		_('Client ID: %s', Setting.value('clientId')),
 		_('Sync Version: %s', Setting.value('syncVersion')),
 		_('Profile Version: %s', reg.db().version()),
-		// The portable app temporarily supports read-only keychain access (but disallows
-		// write).
-		_('Keychain Supported: %s', (Setting.value('keychain.supported') >= 1 && !shim.isPortable()) ? _('Yes') : _('No')),
+		_('Keychain Supported: %s', keychainSupported ? _('Yes') : _('No')),
 	];
 
 	if (gitInfo) {