Fix auto update not working for AppImage (#4256)

src/main/app-updater.ts

@@ -21,7 +21,7 @@
 
 import { autoUpdater, UpdateInfo } from "electron-updater";
 import logger from "./logger";
-import { isDevelopment, isMac, isPublishConfigured, isTestEnv } from "../common/vars";
+import { isDevelopment, isLinux, isMac, isPublishConfigured, isTestEnv } from "../common/vars";
 import { delay } from "../common/utils";
 import { areArgsUpdateAvailableToBackchannel, AutoUpdateLogPrefix, broadcastMessage, onceCorrect, UpdateAvailableChannel, UpdateAvailableToBackchannel } from "../common/ipc";
 import { once } from "lodash";
@@ -48,6 +48,14 @@ function handleAutoUpdateBackChannel(event: Electron.IpcMainEvent, ...[arg]: Upd
            * download it from itself via electron.
            */
           electronAutoUpdater.checkForUpdates();
+        } else if (isLinux) {
+          /**
+           * This is a necessary workaround until electron-updater is fixed.
+           * The problem is that because linux updating is not implemented at
+           * all via electron. Electron's autoUpdater.quitAndInstall() is never
+           * called.
+           */
+          electronAutoUpdater.emit("before-quit-for-update");
         }
         autoUpdater.quitAndInstall(true, true);
       });

src/main/index.ts

@@ -286,7 +286,10 @@ app.on("activate", (event, hasVisibleWindows) => {
  */
 let blockQuit = !isIntegrationTesting;
 
-autoUpdater.on("before-quit-for-update", () => blockQuit = false);
+autoUpdater.on("before-quit-for-update", () => {
+  logger.debug("Unblocking quit for update");
+  blockQuit = false;
+});
 
 app.on("will-quit", (event) => {
   // This is called when the close button of the main window is clicked