fs: throw fs.mkdtempSync errors in JS land

PR-URL: https://github.com/nodejs/node/pull/18871
Refs: https://github.com/nodejs/node/issues/18106
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

lib/fs.js

@@ -1839,7 +1839,12 @@ fs.mkdtempSync = function(prefix, options) {
                                prefix);
   }
   nullCheck(prefix, 'prefix');
-  return binding.mkdtemp(`${prefix}XXXXXX`, options.encoding);
+  const path = `${prefix}XXXXXX`;
+  const ctx = { path };
+  const result = binding.mkdtemp(path, options.encoding,
+                                 undefined, ctx);
+  handleErrorFromBinding(ctx);
+  return result;
 };
 
 

src/node_file.cc

@@ -1608,7 +1608,8 @@ static void FUTimes(const FunctionCallbackInfo<Value>& args) {
 static void Mkdtemp(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
 
-  CHECK_GE(args.Length(), 2);
+  const int argc = args.Length();
+  CHECK_GE(argc, 2);
 
   BufferValue tmpl(env->isolate(), args[0]);
   CHECK_NE(*tmpl, nullptr);
@@ -1616,18 +1617,22 @@ static void Mkdtemp(const FunctionCallbackInfo<Value>& args) {
   const enum encoding encoding = ParseEncoding(env->isolate(), args[1], UTF8);
 
   FSReqBase* req_wrap = GetReqWrap(env, args[2]);
-  if (req_wrap != nullptr) {
+  if (req_wrap != nullptr) {  // mkdtemp(tmpl, encoding, req)
     AsyncCall(env, req_wrap, args, "mkdtemp", encoding, AfterStringPath,
               uv_fs_mkdtemp, *tmpl);
-  } else {
-    SYNC_CALL(mkdtemp, *tmpl, *tmpl);
-    const char* path = static_cast<const char*>(SYNC_REQ.path);
+  } else {  // mkdtemp(tmpl, encoding, undefined, ctx)
+    CHECK_EQ(argc, 4);
+    fs_req_wrap req_wrap;
+    SyncCall(env, args[3], &req_wrap, "mkdtemp",
+             uv_fs_mkdtemp, *tmpl);
+    const char* path = static_cast<const char*>(req_wrap.req.path);
 
     Local<Value> error;
     MaybeLocal<Value> rc =
         StringBytes::Encode(env->isolate(), path, encoding, &error);
     if (rc.IsEmpty()) {
-      env->isolate()->ThrowException(error);
+      Local<Object> ctx = args[3].As<Object>();
+      ctx->Set(env->context(), env->error_string(), error).FromJust();
       return;
     }
     args.GetReturnValue().Set(rc.ToLocalChecked());

test/parallel/test-fs-error-messages.js

@@ -25,6 +25,7 @@ const fixtures = require('../common/fixtures');
 const assert = require('assert');
 const fs = require('fs');
 const nonexistentFile = fixtures.path('non-existent');
+const nonexistentDir = fixtures.path('non-existent', 'foo', 'bar');
 const existingFile = fixtures.path('exit.js');
 const existingFile2 = fixtures.path('create-file.js');
 const existingDir = fixtures.path('empty');
@@ -607,3 +608,29 @@ if (!common.isAIX) {
     validateError
   );
 }
+
+// mkdtemp
+{
+  const validateError = (err) => {
+    const pathPrefix = new RegExp('^' + re`${nonexistentDir}`);
+    assert(pathPrefix.test(err.path),
+           `Expect ${err.path} to match ${pathPrefix}`);
+
+    const prefix = new RegExp('^ENOENT: no such file or directory, mkdtemp ' +
+                              re`'${nonexistentDir}`);
+    assert(prefix.test(err.message),
+           `Expect ${err.message} to match ${prefix}`);
+
+    assert.strictEqual(err.errno, uv.UV_ENOENT);
+    assert.strictEqual(err.code, 'ENOENT');
+    assert.strictEqual(err.syscall, 'mkdtemp');
+    return true;
+  };
+
+  fs.mkdtemp(nonexistentDir, common.mustCall(validateError));
+
+  assert.throws(
+    () => fs.mkdtempSync(nonexistentDir),
+    validateError
+  );
+}