set-guid - helps setting the partition GUID

I wrote a script to help manage the GUID updates to the partition. This way, it's easy to switch between the OS X and AppleTV-bootable GUIDs. The script is attached. Here's how to use it, for the third volume of disk1:

• set AppleTV-bootable GUID: ./set-guid /dev/disk1 3
• set OS X-accessible GUID: ./set-guid /dev/disk1 3 r
• test the script and see the commands it'll run: ./set-guid /dev/disk1 3 --test
• if you want to give it the start/end sectors directly: ./set-guid /dev/disk1 3 409640 20604520

When you set the GUID to AppleTV-bootable, you'll see something like this:

Code:

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> ./set-guid /dev/disk1 3
Disk /dev/disk1 unmounted
gpt remove: /dev/disk1: 1 partition(s) removed
Disk /dev/disk1 unmounted

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The script works for me - my AppleTV just booted OS X Server. Be careful - at this point the error checking in the script is not of the greatest quality.

Let me know if you find any bugs. :D Enjoy.