Unzip messes up file permissions on Mac. Can I run chmod myself?

I want my Patcher unity app to unzip some files(Another unity app). If i download and unzip this file manually all is fine. However, If I use my code to do so the permissions are read only and I can no longer execute the unzipped Unity application.

I need the Unity patch app to be able to run this on the extracted app:

Code (csharp):

1. chmod +x MYAPP.app/Contents/MacOS/MYAPP

The unzip code:

Code (csharp):

1. private static bool UnzipStream(string outputFolder, string password, bool deleteZipFile, ZipInputStream s){
2.             if (password != null  password != String.Empty)
3.                 s.Password = password;
4.             ZipEntry theEntry;
5.             //string tmpEntry = String.Empty;
6.             while ((theEntry = s.GetNextEntry()) != null)
7.             {
8.                
9.                 string directoryName = outputFolder;
10.                 string fileName = Path.GetFileName(theEntry.Name);
11.                 // create directory
12.                 if (directoryName != "")
13.                 {
14.                     Directory.CreateDirectory(directoryName);
15.                 }
16.                 if (fileName != String.Empty)
17.                 {
18.                     if (theEntry.Name.IndexOf(".ini") < 0)
19.                     {
20.                        
21.                         string fullPath = directoryName + "\\" + theEntry.Name;
22.                         fullPath = fullPath.Replace("\\ ", "\\");
23.                         string fullDirPath = Path.GetDirectoryName(fullPath);
24.                         if (!Directory.Exists(fullDirPath)) Directory.CreateDirectory(fullDirPath);
25.                         FileStream streamWriter = File.Create(fullPath);
26.                         int size = 2048;
27.                         byte[] data = new byte[2048];
28.                         while (true)
29.                         {
30.                             size = s.Read(data, 0, data.Length);
31.                             if (size > 0)
32.                             {
33.                                 streamWriter.Write(data, 0, size);
34.                             }
35.                             else
36.                             {
37.                                 break;
38.                             }
39.                         }
40.                         streamWriter.Close();
41.                     }
42.                 }
43.             }
44.             s.Close();
45.             return true;
46.         }

I believe the File.Create() call cannot create a file with execute permissions, see: http://www.mail-archive.com/mono-devel-list@lists.ximian.com/msg21088.html.

Or can I manually call chmod somehow? This should be possible via Mono.Posix. But I don't think Unity allows that?

I'm now thinking about having my Unity app start a seperate process that simply executes chmod on the unzipped files. It doesn't seem to execute a .command app in a new process.

 

Mono.Unix.Native.Syscall.chmod("Cubelands", Mono.Unix.Native.FilePermissions.ALLPERMS);

Compiled, however at runtime it complains about missing `MonoPosixHelper'. Adding libMonoPosixHelper complains about missing mscrvt (or something like that) which is a windows thingy :/.

 

How did you get access to Mono.Unix.Native? I don't even have "Mono"...

UPD: found this - running chmod via System.Diagnostics.Process