This file is indexed.

/usr/share/initramfs-tools/hooks/lupin_casper is in lupin-casper 0.51.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /bin/sh
set -e

PREREQ="casper"

prereqs () {
	echo "$PREREQ"
}

case $1 in
    prereqs)
	prereqs
	exit 0
	;;
esac

cp -p /usr/share/initramfs-tools/scripts/lupin-helpers $DESTDIR/scripts/

exit 0