This file is indexed.

/lib/live/config/1050-kaboom is in live-config 5.20170112+deb9u1.

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

## live-config(7) - System Configuration Components
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


#set -e

Cmdline ()
{
	# Reading kernel command line
	for _PARAMETER in ${LIVE_CONFIG_CMDLINE}
	do
		case "${_PARAMETER}" in
			live-config.username=*|username=*)
				LIVE_USERNAME="${_PARAMETER#*username=}"
				;;
		esac
	done
}

Init ()
{
	# Checking if package is installed or already configured
	if [ ! -e /var/lib/dpkg/info/kaboom.list ] || \
	   [ -e /var/lib/live/config/kaboom ]
	then
		exit 0
	fi

	echo -n " kaboom"
}

Config ()
{
	sudo -u "${LIVE_USERNAME}" sh -c "mkdir -p /home/${LIVE_USERNAME}/.local && touch /home/${LIVE_USERNAME}/.local/kaboom"

	# Creating state file
	touch /var/lib/live/config/kaboom
}

Cmdline
Init
Config