This file is indexed.

/usr/sbin/faireboot is in fai-nfsroot 5.3.6ubuntu1.

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/bash

# reboot FAI correctly, Thomas Lange, Uni Koeln, copyright 2000-2015

faimond=0
. /usr/lib/fai/subroutines

[ -f /tmp/fai/variables.log ] && . /tmp/fai/variables.log

while getopts s opt ; do
        case "$opt" in
        s) fai-savelog -r ;;
        esac
done

cd /
killall -STOP rcS
killall -q apt-get dpkg tar gzip yes cat rsyslogd

[ "X" == "X$SSH_CLIENT" -a  "$TERM" != "dumb" ] && killall -q sshd

fai-divert -R

mountpoint -q $FAI_ROOT/proc && umount $FAI_ROOT/proc
mountpoint -q $FAI_ROOT/dev/pts && umount $FAI_ROOT/dev/pts
killall udevd
sendmon "TASKEND reboot 0"
umount -a -t nonfs,noproc 2>/dev/null
umount -arf 2>/dev/null

echo "$HOSTNAME now rebooting"

if [ "X" == "X$SSH_CLIENT" -a  "$TERM" != "dumb" ]; then
    exec reboot -df
fi

killall -CONT rcS
killall rcS
init 6 &