Pre-flight saving a Core Data binary store

gistfile1.matlab

NSNumber *writable;
if ([storeURL getResourceValue:&writable forKey:NSURLIsWritableKey error:outError])
{
    if ([writable boolValue])
    {
        return [context save:outError];
    }
    else if (outError)
    {
        // Generic error. NSError takes care of supplying a nice generic message to go with it
        *outError = [NSError errorWithDomain:NSCocoaErrorDomain
                                        code:NSFileWriteNoPermissionError
                                    userInfo:nil];
    }
}

return NO;