A script to enable tracking the DocumentIdentifier for a file on OSX.

StartTrackingDocumentIdentifier.swift

#!/usr/bin/env swift

import Foundation

let args = Process.arguments

if (args.count != 2) {
    print("usage: \(args[0].lastPathComponent) <file>\n")
    exit(-1)
}

let flag = UInt32(UF_TRACKED)
let fileName = args[1] as NSString

if 0 != chflags(fileName.UTF8String, flag) {
    let error = String.fromCString(strerror(errno))!
    print("Error changing flags: \(error)\n")
}