Well they forgot to enable Journalling so they just have to turn it back on with this update. And after it runs the .dist file and makes sure you have the right machine, it runs this command:
/System/Library/Filesystems/hfs.fs/hfs.util -J /
You’ll find it in the postflight file. Besides that it installs a blank dummy file in /var/tmp, because otherwise a package will complain that it didn’t have anything to do!
Anyhoo, to check to see if you have Journalling installed, there are many ways, but here’s the Terminal way:
/System/Library/Filesystems/hfs.fs/hfs.util -I /