preinst is in innfeed 0.10.1.7-8.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9  | #!/bin/sh -e
case "$2" in
    0.9.*)
	echo "Upgrade from innfeed 0.9.x is not supported."
	echo "Please write to md@linux.it"
	exit 1
    ;;
esac
 |