Re-enable msi perMachine builds (#1587)

src/squirrelhooks.ts

@@ -18,12 +18,16 @@ import path from "path";
 import { spawn } from "child_process";
 import { app } from "electron";
 
+export function getSquirrelExecutable(): string {
+    return path.resolve(path.dirname(process.execPath), "..", "Update.exe");
+}
+
 function runUpdateExe(args: string[]): Promise<void> {
     // Invokes Squirrel's Update.exe which will do things for us like create shortcuts
     // Note that there's an Update.exe in the app-x.x.x directory and one in the parent
     // directory: we need to run the one in the parent directory, because it discovers
     // information about the app by inspecting the directory it's run from.
-    const updateExe = path.resolve(path.dirname(process.execPath), "..", "Update.exe");
+    const updateExe = getSquirrelExecutable();
     console.log(`Spawning '${updateExe}' with args '${args}'`);
     return new Promise((resolve) => {
         spawn(updateExe, args, {

src/updater.ts

@@ -15,6 +15,9 @@ limitations under the License.
 */
 
 import { app, autoUpdater, ipcMain } from "electron";
+import fs from "node:fs/promises";
+
+import { getSquirrelExecutable } from "./squirrelhooks";
 
 const UPDATE_POLL_INTERVAL_MS = 60 * 60 * 1000;
 const INITIAL_UPDATE_DELAY_MS = 30 * 1000;
@@ -74,10 +77,12 @@ async function pollForUpdates(): Promise<void> {
     }
 }
 
-export function start(updateBaseUrl: string): void {
+export async function start(updateBaseUrl: string): Promise<void> {
+    if (!(await available(updateBaseUrl))) return;
     if (updateBaseUrl.slice(-1) !== "/") {
         updateBaseUrl = updateBaseUrl + "/";
     }
+
     try {
         let url: string;
         let serverType: "json" | undefined;
@@ -93,7 +98,6 @@ export function start(updateBaseUrl: string): void {
             // Squirrel / electron only supports auto-update on these two platforms.
             // I'm not even going to try to guess which feed style they'd use if they
             // implemented it on Linux, or if it would be different again.
-            console.log("Auto update not supported on this platform");
             return;
         }
 
@@ -116,6 +120,26 @@ export function start(updateBaseUrl: string): void {
     }
 }
 
+async function available(updateBaseUrl?: string): Promise<boolean> {
+    if (process.platform === "linux") {
+        // Auto update is not supported on Linux
+        console.log("Auto update not supported on this platform");
+        return false;
+    }
+
+    if (process.platform === "win32") {
+        try {
+            await fs.access(getSquirrelExecutable());
+        } catch {
+            console.log("Squirrel not found, auto update not supported");
+            return false;
+        }
+    }
+
+    // Otherwise we're either on macOS or Windows with Squirrel
+    return !!updateBaseUrl;
+}
+
 ipcMain.on("install_update", installUpdate);
 ipcMain.on("check_updates", pollForUpdates);