Mac TimeMachine File Exclusions

base/mac/mac_util.mm

Index: base/mac/mac_util.mm
===================================================================
--- base/mac/mac_util.mm	(revision 86429)
+++ base/mac/mac_util.mm	(working copy)
@@ -268,13 +268,14 @@
   }
 
   NSURL* url = [NSURL fileURLWithPath:filePath];
-  // Note that we always set CSBackupSetItemExcluded's excludeByPath param
-  // to true.  This prevents a problem with toggling the setting: if the file
-  // is excluded with excludeByPath set to true then excludeByPath must
-  // also be true when un-excluding the file, otherwise the un-excluding
-  // will be ignored.
+  // When excludeByPath is true the application must be running with root
+  // privileges (admin for 10.6 and earlier) but the URL does not have to
+  // already exist. When excludeByPath is false the URL must already exist but
+  // can be used in non-root (or admin as above) mode. We use false so that
+  // non-root (or admin) users don't get their TimeMachine drive filled up with
+  // unnecessary backups.
   bool success =
-      CSBackupSetItemExcluded((CFURLRef)url, exclude, true) == noErr;
+      CSBackupSetItemExcluded((CFURLRef)url, exclude, false) == noErr;
   if (!success)

[Mark Mentovai, 2011/05/25 01:14:35]

Style nit (present in the existing code): this needs {braces} because it
consumes multiple lines.

[mrossetti, 2011/05/26 21:02:40]

Done.

     LOG(WARNING) << "Failed to set backup exclusion for file '"
                  << file_path.value().c_str() << "'.  Continuing.";