import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

toolkit/xre/updaterfileutils_osx.mm

@@ -0,0 +1,52 @@
+/* -*- 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;
+}