This file is indexed.

/usr/share/initramfs-tools/scripts/local-block/cryptroot is in cryptsetup 2:1.6.6-5ubuntu2.

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

PREREQ=""

prereqs()
{
	echo $PREREQ
}

case $1 in
# get pre-requisites
prereqs)
	prereqs
	exit 0
	;;
esac

if [ -x /scripts/local-top/cryptroot ]; then
	exec /scripts/local-top/cryptroot
fi