This file is indexed.

/usr/share/debian-lan-config/fai/config/scripts/FAIBASE/20-removable_media is in debian-lan-config 0.19+deb8u1.

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

# (c) Thomas Lange, 2006,2009, lange@debian.org
# create entries for removable media in fstab and directories in /media

[ -b $target/dev/fd0 ] && ainsl /etc/fstab "/dev/fd0  /media/floppy  auto  users,noauto 0 0"

cdromlist() {
    [ -f /proc/sys/dev/cdrom/info ] || return
    devs=$(grep 'drive name:' /proc/sys/dev/cdrom/info | cut -d ":" -f 2)
    for d in $devs; do
        echo $d
    done
}

fstabline () {
    line=$(printf "%-15s %-15s %-7s %-15s %-7s %s\n" "$1" "$2" "$3" "$4" "$5" "$6")
    ainsl /etc/fstab "$line" "^$1"
}

i=0
for cdrom in $(cdromlist | tac); do
    [ $i -eq 0 ] && ln -s cdrom0 $target/media/cdrom
    mkdir -p $target/media/cdrom$i
    fstabline /dev/$cdrom /media/cdrom$i udf,iso9660 ro,user,noauto 0 0
    i=$(($i + 1))
done