This file is indexed.

/usr/share/initramfs-tools/scripts/live-bottom/10validateroot is in live-boot-initramfs-tools 3.0~a24-1ubuntu1.

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

# Error out in case a "wrong" file system was chosen.

#set -e

# initramfs-tools header

PREREQ=""

prereqs()
{
	echo "${PREREQ}"
}

case "${1}" in
	prereqs)
		prereqs
		exit 0
		;;
esac

. /scripts/live-functions
. /scripts/live-helpers

if ! [ -d "/root/usr/share/live-boot" ]
then
	panic "A wrong rootfs was mounted."
fi