This file is indexed.

/usr/lib/fai/get-boot-info is in fai-client 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

#*********************************************************************
#
# bootinfo -- get boot information via DHCP protocol
#
# This script is part of FAI (Fully Automatic Installation)
# (c) 2003-2017 by Thomas Lange, lange@informatik.uni-koeln.de
# Universitaet zu Koeln
#
#*********************************************************************
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# A copy of the GNU General Public License is available as
# `/usr/share/common-licences/GPL' in the Debian GNU/Linux distribution
# or on the World Wide Web at http://www.gnu.org/copyleft/gpl.html.  You
# can also obtain it by writing to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#*********************************************************************

# this script writes received information to $LOGDIR/boot.log

bootlog=$LOGDIR/boot.log

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
netdevice_info() {

    # devices that are running
    netdevices_up=$(ip link show up | grep "^[1-9$].*LOWER_UP" | cut -d : -f 2 | cut -d ' ' -f 2 | grep -v "^lo" | sort | uniq| tr '\n' ' ')
    # netdevices is the list of ethernet devices which will be used for bootpc (maybe dhcp)
    # if not defined, use boot messages to determine network devices
    [ -n "$netdevices" ] || netdevices=$netdevices_up

    netdevices_all=$(ip link | grep "^[1-9]" | cut -d : -f 2 | cut -d ' ' -f 2 | egrep "^eth|^en")
    netdevices_all=$(for dev in $netdevices_all; do echo $dev; done| sort | uniq| tr '\n' ' ')
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
get_dhcp_info() {

    if [ $boot -eq 1 ]; then
	return
    fi
    boot=1
    cat > $bootlog <<-EOF
	netdevices_all="$netdevices_all"
	netdevices_up="$netdevices_up"
	netdevices="$netdevices"
EOF
    dhclient -lf /dev/null -cf /usr/share/fai/dhclient-fai.conf -sf /usr/share/fai/dhclient-fai-script $netdevices >>$bootlog 2> $LOGDIR/dhclient.log
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
setnet() {

    # get network parameters
    # first get first active network device
    local dev dummy n

    n=0
    until [ $n = 7 ]; do
	dev=$(ip ad show up | awk -F': ' '/^[0-9]/ && ! / lo:/ {print $2;exit}')
	if [ -z "$dev" ]; then
            sleep 2 # if interface needs some time to come up
	else
	    break
	fi
	n=$(($n + 1))
    done

    read IPADDR NETMASK BROADCAST dummy<<<$(ifdata -p $dev)
    CIDR=$(ip -o -f inet addr show| awk '{print $4}'| grep $IPADDR)
    GATEWAYS=$(ip route | awk '/^default/ {print $3}')

    cat >> $bootlog <<-EOF
	netdevices_all="$netdevices_all"
	netdevices_up="$netdevices_up"
	netdevices="$netdevices"
	IPADDR=$IPADDR
	SERVER=$SERVER
	NETMASK=$NETMASK
	GATEWAYS=$GATEWAYS
	BROADCAST=$BROADCAST
	CIDR=$CIDR
EOF

    if [ -n "$DOMAIN" ]; then
        # DOMAIN was specified on the kernel command line
        echo "DOMAIN=$DOMAIN" >> $bootlog
    fi
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
get_fixed_info() {

    if [ $boot -eq 1 ]; then
	return
    fi
    boot=1
    # ip contains the network parameters
    echo $ip | grep -q : || echo "Kernel parameter ip= does not contain network parameters."
    setnet
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
nic_list_from_cmdline() {

    # parse nic(s) that are specified on the kernel command line like this:  ip=etX:dhcp

    niclist=
    line=$(< /proc/cmdline)

    for item in $line; do
	case $item in

	    ip=*:dhcp)
            nic=
	    # count the : char in the argument of ip=
	    n="${item//[^:]}"
	    # if there are more than 5 :, it's an static IP configuration, do not use this nic
	    if [ ${#n} -lt 5 ]; then
		nic=$(expr match "$item" 'ip=\(.*\):dhcp')
		niclist+=" $nic"
	    fi
	    ;;
	esac
    done
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

netdevice_info
boot=0

# if ip= parameter contains IP address, get fixed IP data, otherwise use DHCP
if [[ $ip =~ ^.*:*[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3} ]]; then
    get_fixed_info
fi

# if devices are specified on the kernel command line, only use those devices for DHCP
nic_list_from_cmdline
if [ -n "$niclist" ]; then
    netdevices=$niclist
fi

get_dhcp_info

# DHCP should not overwrite the hostname if it's already set
# then remove this line from boot.log
read hname < /proc/sys/kernel/hostname
if [ -n "$hname" -o "$hname" = '(none)' ]; then
    sed -i -e '/^HOSTNAME=/d' $bootlog
fi

if ! grep -q DOMAIN= $bootlog; then
    echo 'Info: no domain name configured, using "localdomain"' >&2
    echo "DOMAIN=localdomain" >> $bootlog
fi