Updates: don't attempt to apply updates if it's not newer.

When we check for updates, we set an `isInstallable` flag in our cache if
the new version has been downloaded.  However, that flag isn't being
cleared right after an update (because Squirrel.Mac etc. doesn't know about
it).  Sanity check that flag by comparing the app version against the
staged app version, to make sure that we only abort startup for updates
that we may actually apply.

Signed-off-by: Mark Yen <mark.yen@suse.com>

Author: mook-as

src/main/update/LonghornProvider.ts

@@ -4,9 +4,11 @@ import path from 'path';
 import { URL } from 'url';
 
 import { newError, PublishConfiguration } from 'builder-util-runtime';
+import Electron from 'electron';
 import { AppUpdater, Provider, ResolvedUpdateFileInfo, UpdateInfo } from 'electron-updater';
 import { ProviderRuntimeOptions } from 'electron-updater/out/providers/Provider';
 import fetch from 'node-fetch';
+import semver from 'semver';
 
 import Logging from '@/utils/logging';
 import paths from '@/utils/paths';
@@ -125,9 +127,28 @@ export async function hasQueuedUpdate(): Promise<boolean> {
     const rawCache = await fs.promises.readFile(gCachePath, 'utf-8');
     const cache: LonghornCache = JSON.parse(rawCache);
 
-    if (cache.isInstallable) {
-      return true;
+    if (!cache.isInstallable) {
+      return false;
     }
+
+    // The isInstallable flag isn't going to get clear _right_ after an update;
+    // in which case, we need to check that the release is newer than the
+    // current version.
+    const currentVersion = semver.parse(Electron.app.getVersion(), { loose: true });
+    const stagedVersion = semver.parse(cache.release.tag, { loose: true });
+
+    if (!currentVersion || !stagedVersion) {
+      console.log(`Error parsing staged versions: ${ currentVersion } -> ${ stagedVersion }`);
+
+      return false;
+    }
+    if (currentVersion.compare(stagedVersion) >= 0) {
+      console.log(`Staged version ${ stagedVersion } not greater than current version ${ currentVersion }, skipping.`);
+
+      return false;
+    }
+
+    return true;
   } catch (error) {
     if (error.code !== 'ENOENT') {
       console.error('Could not check for queued update:', error);