Resizes TimeMachine sparesbundle maximum size and then locks the file

resize.sh

#!/bin/bash
# This script resizes a sparsebundle and locks the Info.plist to prevent timemachine resizing it.
# Usage
# resize.sh MacBook.sparsebundle 100g
# which resizes the sparse bundle to 100GB

 
echo "unlocking Info.plist"
SetFile -a l "${1%/}/Info.plist"
 
echo "Resizing '$1' to '$2'"
hdiutil resize -size $2 -shrinkonly "$1"
 
echo "locking Info.plist"
SetFile -a L "${1%/}/Info.plist"
 
echo "Complete"