patch: handle ext2fs with webpack

Author: mcraa

webpack.config.ts

@@ -15,7 +15,7 @@
  */
 
 import * as CopyPlugin from 'copy-webpack-plugin';
-import { readdirSync } from 'fs';
+import { readdirSync, existsSync } from 'fs';
 import * as _ from 'lodash';
 import * as os from 'os';
 import outdent from 'outdent';
@@ -77,6 +77,27 @@ function renameNodeModules(resourcePath: string) {
 	);
 }
 
+function findExt2fsFolder(): string {
+	const ext2fs = 'node_modules/ext2fs';
+	const biFsExt2fs = 'node_modules/balena-image-fs/node_modules/ext2fs';
+
+	if (existsSync(ext2fs)) {
+		return ext2fs;
+	} else if (existsSync(biFsExt2fs)) {
+		return biFsExt2fs;
+	} else {
+		throw Error('ext2fs not found');
+	}
+}
+
+function makeExt2FsRegex(): RegExp {
+	const folder = findExt2fsFolder();
+	const libpath = '/lib/libext2fs\\.js&';
+
+	const regex = folder.concat(libpath).split('/').join('/');
+	return new RegExp(regex);
+}
+
 function findUsbPrebuild(): string[] {
 	const usbPrebuildsFolder = path.join('node_modules', 'usb', 'prebuilds');
 	const prebuildFolders = readdirSync(usbPrebuildsFolder);
@@ -152,6 +173,7 @@ function slashOrAntislash(pattern: RegExp): RegExp {
 }
 
 function replace(test: RegExp, ...replacements: ReplacementRule[]) {
+	console.log(test.source);
 	return {
 		loader: 'string-replace-loader',
 		// Handle windows path separators
@@ -322,7 +344,7 @@ const commonConfig = {
 			// Use the libext2fs.wasm file in the generated folder
 			// The way to find the app directory depends on whether we run in the renderer or in the child-writer
 			// We use __dirname in the child-writer and electron.remote.app.getAppPath() in the renderer
-			replace(/node_modules\/ext2fs\/lib\/libext2fs\.js$/, {
+			replace(makeExt2FsRegex(), {
 				search: 'scriptDirectory = __dirname + "/";',
 				replace: fetchWasm('ext2fs', 'lib'),
 			}),
@@ -385,7 +407,7 @@ const guiConfigCopyPatterns = [
 		to: 'modules/node-raspberrypi-usbboot/blobs',
 	},
 	{
-		from: 'node_modules/ext2fs/lib/libext2fs.wasm',
+		from: `${findExt2fsFolder()}/lib/libext2fs.wasm`,
 		to: 'modules/ext2fs/lib/libext2fs.wasm',
 	},
 	{
@@ -394,6 +416,8 @@ const guiConfigCopyPatterns = [
 	},
 ];
 
+console.log(guiConfigCopyPatterns);
+
 if (os.platform() === 'win32') {
 	// liblzma.dll is required on Windows for lzma-native
 	guiConfigCopyPatterns.push({