fs: make write/appendFileSync correctly set file mode

lib/fs.js

@@ -963,7 +963,7 @@ fs.writeFileSync = function(path, data, options) {
   assertEncoding(options.encoding);
 
   var flag = options.flag || 'w';
-  var fd = fs.openSync(path, flag);
+  var fd = fs.openSync(path, flag, options.mode);
   if (!Buffer.isBuffer(data)) {
     data = new Buffer('' + data, options.encoding || 'utf8');
   }

test/simple/test-fs-write-file-sync.js

@@ -0,0 +1,98 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+var common = require('../common');
+var assert = require('assert');
+var path = require('path');
+var fs = require('fs');
+var isWindows = process.platform === 'win32';
+var openCount = 0;
+var mode;
+var content;
+
+// Need to hijack fs.open/close to make sure that things
+// get closed once they're opened.
+fs._openSync = fs.openSync;
+fs.openSync = openSync;
+fs._closeSync = fs.closeSync;
+fs.closeSync = closeSync;
+
+// Reset the umask for testing
+var mask = process.umask(0000);
+
+// On Windows chmod is only able to manipulate read-only bit. Test if creating
+// the file in read-only mode works.
+if (isWindows) {
+  mode = 0444;
+} else {
+  mode = 0755;
+}
+
+// Test writeFileSync
+var file1 = path.join(common.tmpDir, 'testWriteFileSync.txt');
+removeFile(file1);
+
+fs.writeFileSync(file1, '123', {mode: mode});
+
+content = fs.readFileSync(file1, {encoding: 'utf8'});
+assert.equal('123', content);
+
+assert.equal(mode, fs.statSync(file1).mode & 0777);
+
+removeFile(file1);
+
+// Test appendFileSync
+var file2 = path.join(common.tmpDir, 'testAppendFileSync.txt');
+removeFile(file2);
+
+fs.appendFileSync(file2, 'abc', {mode: mode});
+
+content = fs.readFileSync(file2, {encoding: 'utf8'});
+assert.equal('abc', content);
+
+assert.equal(mode, fs.statSync(file2).mode & mode);
+
+removeFile(file2);
+
+// Verify that all opened files were closed.
+assert.equal(0, openCount);
+
+// Removes a file if it exists.
+function removeFile(file) {
+  try {
+    if (isWindows)
+      fs.chmodSync(file, 0666);
+    fs.unlinkSync(file);
+  } catch (err) {
+    if (err && err.code !== 'ENOENT')
+      throw err;
+  }
+}
+
+function openSync() {
+  openCount++;
+  return fs._openSync.apply(fs, arguments);
+}
+
+function closeSync() {
+  openCount--;
+  return fs._closeSync.apply(fs, arguments);
+}