Fix extensions installation on Windows (#1596)

* Fix extensions installation on Windows

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Get rid of readFileSync

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

* Add missing semicolon

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

src/common/utils/tar.ts

@@ -15,7 +15,7 @@ export function readFileFromTar<R = Buffer>({ tarPath, filePath, parseJson }: Re
 
     await tar.list({
       file: tarPath,
-      filter: path => path === filePath,
+      filter: entryPath => path.normalize(entryPath) === filePath,
       onentry(entry: FileStat) {
         entry.on("data", chunk => {
           fileChunks.push(chunk);
@@ -41,7 +41,9 @@ export async function listTarEntries(filePath: string): Promise<string[]> {
   const entries: string[] = [];
   await tar.list({
     file: filePath,
-    onentry: (entry: FileStat) => entries.push(entry.path as any as string),
+    onentry: (entry: FileStat) => {
+      entries.push(path.normalize(entry.path as any as string));
+    },
   });
   return entries;
 }