Display error dialog if extensions couldn't be loaded (#1752)

* Display error dialog if extensions couldn't be loaded
* Reject npm install on failure using the process exit code

Signed-off-by: Panu Horsmalahti <phorsmalahti@mirantis.com>

src/extensions/extension-discovery.ts

@@ -266,18 +266,30 @@ export class ExtensionDiscovery {
 
     logger.info(`${logModule} loading extensions from ${extensionInstaller.extensionPackagesRoot}`);
 
-    if (fs.existsSync(path.join(extensionInstaller.extensionPackagesRoot, "package-lock.json"))) {
-      await fs.remove(path.join(extensionInstaller.extensionPackagesRoot, "package-lock.json"));
-    }
+    // fs.remove won't throw if path is missing
+    await fs.remove(path.join(extensionInstaller.extensionPackagesRoot, "package-lock.json"));
+
 
     try {
+      // Verify write access to static/extensions, which is needed for symlinking
       await fs.access(this.inTreeFolderPath, fs.constants.W_OK);
+
+      // Set bundled folder path to static/extensions
       this.bundledFolderPath = this.inTreeFolderPath;
     } catch {
-      // we need to copy in-tree extensions so that we can symlink them properly on "npm install"
+      // If there is error accessing static/extensions, we need to copy in-tree extensions so that we can symlink them properly on "npm install".
+      // The error can happen if there is read-only rights to static/extensions, which would fail symlinking.
+
+      // Remove e.g. /Users/<username>/Library/Application Support/LensDev/extensions
       await fs.remove(this.inTreeTargetPath);
+
+      // Create folder e.g. /Users/<username>/Library/Application Support/LensDev/extensions
       await fs.ensureDir(this.inTreeTargetPath);
+
+      // Copy static/extensions to e.g. /Users/<username>/Library/Application Support/LensDev/extensions
       await fs.copy(this.inTreeFolderPath, this.inTreeTargetPath);
+
+      // Set bundled folder path to e.g. /Users/<username>/Library/Application Support/LensDev/extensions
       this.bundledFolderPath = this.inTreeTargetPath;
     }
 

src/extensions/extension-installer.ts

@@ -33,16 +33,26 @@ export class ExtensionInstaller {
   installDependencies(): Promise<void> {
     return new Promise((resolve, reject) => {
       logger.info(`${logModule} installing dependencies at ${extensionPackagesRoot()}`);
-      const child = child_process.fork(this.npmPath, ["install", "--silent", "--no-audit", "--only=prod", "--prefer-offline", "--no-package-lock"], {
+      const child = child_process.fork(this.npmPath, ["install", "--no-audit", "--only=prod", "--prefer-offline", "--no-package-lock"], {
         cwd: extensionPackagesRoot(),
         silent: true
       });
+      let stderr = "";
 
-      child.on("close", () => {
-        resolve();
+      child.stderr.on("data", data => {
+        stderr += String(data);
       });
-      child.on("error", (err) => {
-        reject(err);
+
+      child.on("close", (code) => {
+        if (code !== 0) {
+          reject(new Error(stderr));
+        } else {
+          resolve();
+        }
+      });
+
+      child.on("error", error => {
+        reject(error);
       });
     });
   }

src/main/index.ts

@@ -93,8 +93,8 @@ app.on("ready", async () => {
     // eslint-disable-next-line unused-imports/no-unused-vars-ts
     proxyServer = LensProxy.create(proxyPort, clusterManager);
   } catch (error) {
-    logger.error(`Could not start proxy (127.0.0:${proxyPort}): ${error.message}`);
-    dialog.showErrorBox("Lens Error", `Could not start proxy (127.0.0:${proxyPort}): ${error.message || "unknown error"}`);
+    logger.error(`Could not start proxy (127.0.0:${proxyPort}): ${error?.message}`);
+    dialog.showErrorBox("Lens Error", `Could not start proxy (127.0.0:${proxyPort}): ${error?.message || "unknown error"}`);
     app.exit();
   }
 
@@ -104,17 +104,21 @@ app.on("ready", async () => {
   windowManager = WindowManager.getInstance<WindowManager>(proxyPort);
 
   // call after windowManager to see splash earlier
-  const extensions = await extensionDiscovery.load();
+  try {
+    const extensions = await extensionDiscovery.load();
 
-  // Subscribe to extensions that are copied or deleted to/from the extensions folder
-  extensionDiscovery.events.on("add", (extension: InstalledExtension) => {
-    extensionLoader.addExtension(extension);
-  });
-  extensionDiscovery.events.on("remove", (lensExtensionId: LensExtensionId) => {
-    extensionLoader.removeExtension(lensExtensionId);
-  });
+    // Subscribe to extensions that are copied or deleted to/from the extensions folder
+    extensionDiscovery.events.on("add", (extension: InstalledExtension) => {
+      extensionLoader.addExtension(extension);
+    });
+    extensionDiscovery.events.on("remove", (lensExtensionId: LensExtensionId) => {
+      extensionLoader.removeExtension(lensExtensionId);
+    });
 
-  extensionLoader.initExtensions(extensions);
+    extensionLoader.initExtensions(extensions);
+  } catch (error) {
+    dialog.showErrorBox("Lens Error", `Could not load extensions${error?.message ? `: ${error.message}` : ""}`);
+  }
 
   setTimeout(() => {
     appEventBus.emit({ name: "service", action: "start" });