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diff --git a/toolkit/xre/updaterfileutils_osx.mm b/toolkit/xre/updaterfileutils_osx.mm
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "updaterfileutils_osx.h"
+
+#include <Cocoa/Cocoa.h>
+
+bool IsRecursivelyWritable(const char* aPath)
+{
+ NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
+
+ NSString* rootPath = [NSString stringWithUTF8String:aPath];
+ NSFileManager* fileManager = [NSFileManager defaultManager];
+ NSError* error = nil;
+ NSArray* subPaths =
+ [fileManager subpathsOfDirectoryAtPath:rootPath
+ error:&error];
+ NSMutableArray* paths =
+ [NSMutableArray arrayWithCapacity:[subPaths count] + 1];
+ [paths addObject:@""];
+ [paths addObjectsFromArray:subPaths];
+
+ if (error) {
+ [pool drain];
+ return false;
+ }
+
+ for (NSString* currPath in paths) {
+ NSString* child = [rootPath stringByAppendingPathComponent:currPath];
+
+ NSDictionary* attributes =
+ [fileManager attributesOfItemAtPath:child
+ error:&error];
+ if (error) {
+ [pool drain];
+ return false;
+ }
+
+ // Don't check for writability of files pointed to by symlinks, as they may
+ // not be descendants of the root path.
+ if ([attributes fileType] != NSFileTypeSymbolicLink &&
+ [fileManager isWritableFileAtPath:child] == NO) {
+ [pool drain];
+ return false;
+ }
+ }
+
+ [pool drain];
+ return true;
+}