fs: only operate on buffers in rimraf

PR-URL: #30569
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ben Coe <bencoe@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/internal/fs/rimraf.js

@@ -5,6 +5,7 @@
 // - Bring your own custom fs module is not currently supported.
 // - Some basic code cleanup.
 'use strict';
+const { Buffer } = require('buffer');
 const {
   chmod,
   chmodSync,
@@ -19,7 +20,7 @@ const {
   unlink,
   unlinkSync
 } = require('fs');
-const { join } = require('path');
+const { sep } = require('path');
 const { setTimeout } = require('timers');
 const { sleep } = require('internal/util');
 const notEmptyErrorCodes = new Set(['ENOTEMPTY', 'EEXIST', 'EPERM']);
@@ -28,6 +29,8 @@ const retryErrorCodes = new Set(
 const isWindows = process.platform === 'win32';
 const epermHandler = isWindows ? fixWinEPERM : _rmdir;
 const epermHandlerSync = isWindows ? fixWinEPERMSync : _rmdirSync;
+const readdirEncoding = 'buffer';
+const separator = Buffer.from(sep);
 
 
 function rimraf(path, options, callback) {
@@ -116,7 +119,9 @@ function _rmdir(path, options, originalErr, callback) {
 
 
 function _rmchildren(path, options, callback) {
-  readdir(path, (err, files) => {
+  const pathBuf = Buffer.from(path);
+
+  readdir(pathBuf, readdirEncoding, (err, files) => {
     if (err)
       return callback(err);
 
@@ -128,7 +133,9 @@ function _rmchildren(path, options, callback) {
     let done = false;
 
     files.forEach((child) => {
-      rimraf(join(path, child), options, (err) => {
+      const childPath = Buffer.concat([pathBuf, separator, child]);
+
+      rimraf(childPath, options, (err) => {
         if (done)
           return;
 
@@ -205,8 +212,12 @@ function _rmdirSync(path, options, originalErr) {
       // original removal. Windows has a habit of not closing handles promptly
       // when files are deleted, resulting in spurious ENOTEMPTY failures. Work
       // around that issue by retrying on Windows.
-      readdirSync(path).forEach((child) => {
-        rimrafSync(join(path, child), options);
+      const pathBuf = Buffer.from(path);
+
+      readdirSync(pathBuf, readdirEncoding).forEach((child) => {
+        const childPath = Buffer.concat([pathBuf, separator, child]);
+
+        rimrafSync(childPath, options);
       });
 
       const tries = options.maxRetries + 1;